Systems Exam 3 Comprehensive Deck for Review Flashcards

Question

When does the alarm for SSW to CCW Train A/B Low D/P come in?

Answer 1

→ ≤30 psid →indicates CCW HX tube leak, SSW and CCW pump shutdown, or CCW pump malfunction

Answer 2

→SSW Pumps: ≤30 psig →SSW Screenwash Pumps: ≤95 psig

Answer 3

≤10.99 psig on the 10-inch line (might be shortened to 10 psig)

Answer 4

→screenwash header supply valves will fail open →traveling screen differential level detectors will fail to inoperable condition →screenwash pumps will still auto start on 4 hr cycle

Answer 5

→auto start initiated →screenwash valves fully open (supplied from instrument air) →pump starts once screenwash valve fully open with at least one SSW pump running →traveling screens start once discharge pressure >75 psig →if pressure fails to build above 85 psig, pump will trip after 7 sec time delay (bypassed on manual start) Note: if pressure fails to build above 75 psig, manually trip pump

Answer 6

Both trains should be in service (set in auto).

Answer 7

...notify management; system should be drained within 7 days to prevent stagnant water corrosion

Answer 8

→allowed 3 consecutive starts if motor coasts to stop between starts →additional starting attempts must have either 30 mins runtime or 60 mins idle time in between

Answer 9

>30 seconds

Answer 10

Hi-Hi Level Alarm Unit 1: ≥ 88% Unit 2: ≥ 75% Refer to ABN-502 for leakage into CCW system.

Answer 11

Normal Level: Unit 1: 65-77% Unit 2: 46-65% →Alarms to alert operator of level lowering & to initiate makeup →Normal makeup is RMUW (lower dissolved O2) with Demin water as alternate →Operator can open an individual compartment makeup valve or both, but must open 4500-1, RMUW MU VLV, to makeup to either compartment. →Alarm to alert operator that 4500-1 is open

Answer 12

CCW Surge Tank Train A/B Empty: Unit 1: ≤ 57% Unit 2: ≤ 33% AUTOMATIC ACTIONS: →u-HV-4512, U1 Safeguards Loop Train A CCW Return Valve closes →u-HV-4514, U1 Safeguards Loop Train A CCW Supply Valve closes OR →u-HV-4513, U1 Safeguards Loop Train B CCW Return Valve closes →u-HV-4515, U1 Safeguards Loop Train B CCW Supply Valve closes OPERATOR ACTIONS: →Determine affected surge tank →If surge tank level is <57% (33%), ensure affected safeguard loop is isolated →Ensure both CCW pumps are in service

Answer 13

CCW Surge Tank Train A/B Level Lo-Lo Alarm Unit 1: ≤ 63% Unit 2: ≤ 39% →u-LV-4500-1, CCW Surge Tank RMUW Supply Valve opens AND →u-LV-4500, CCW Surge Tank Makeup Valve 4500 (Trn A) or 4501 (Trn B) opens →makeup valve 4500 or 4501 will close at ≈77.5% →u-LV-4500-1 must be manually closed Refer to ABN-502 for leakage out of CCW system. NOTE: Due to cut in surge tank partition plate, it will NOT be possible to determine affected CCW surge tank unless level decreases below approximately 60% level.

Answer 14

→SIS →BOS →Low Pressure in Opposite Train CCW Supply Header: 64 psig (blocked by AL) →Auto Start of Associated SSW Pump on Low Pressure in Alternate Train: 10 psig on 10" line (blocked by AL)

Answer 15

CCW Safeguards Loop Isolations Close on: →Hi-3 Containment Pressure 18.2 psig (2/4) →Associated Train Surge Tank Empty Alarm (57% U1 & 33% U2)

Answer 16

→Pumps Start →Recirc Valves Close →RHR HXs CCW Out Valves open fully and then throttle for 40% design flow (ABOUT 22% OPEN-- blue light on H/S when throttled) →Cooler - Primary Sample Cooler CCW isolates →Vent Chillers Isolate "Please Remember, Rebellious Cats Vomit"

Answer 17

→Excess Letdown HX CCW isolated →RCDT HX CCW isolated →CNTMT CCW Drain Tank flowpath isolated & pumps stop (because of valve limit switch)

Answer 18

→Train separation valves close →CS HX CCW outlet valves (HV-4574 & 4575) fully open then throttle close to achieve 55% design flow, →RHR HX CCW outlet valves (HV-4572 & 4573) fully open then throttle close to achieve 40% design flow (if not already in position; if valve is already >40% open but not full open, they just throttle back to 40%) "forty has an R in it, so RHR throttles to 40% flow"

Answer 19

→energize to actuate signal →CNTMT isolation valves for CCW to/from RCPs close →Non-Safeguards Loop isolation valves close →Safeguards Loops isolate (Hi-3 Signal) →Containment Spray HX CCW outlet valves open fully and throttle back to 55% flow

Answer 20

→Safety Chilled Water Chiller Condensers, 2 @ 300 gpm each →Control Room A/C Unit Condensers, 2 per unit @ 250 gpm each →UPS A/C Unit Condensers, 1 @ 90 gpm per unit (normally in standby) →RHR Pump Seal Coolers, 2 @ 5 gpm each →RHR Heat Exchangers, 2 @ 7600 gpm each (design) →Containment Spray Pump Seal Coolers, 4 @ 2 gpm each →Containment Spray Heat Exchangers, 2 @ 6080 gpm each (design) →Post Accident Sampling System (PASS) Cooler, 7 gpm (Train A Only)

Answer 21

Any start of a CCW pump will automatically start the following equipment, if their control switches are in AUTO: →Associated CCW pump room fan cooler →Associated SSW pump →Associated Safety Chilled Water recirc pump (which will then start associated safety chiller)

Answer 22

Closes on any RCP Hi Return flow of 64 gpm. The F in TFT

Answer 23

→closes on any RCP High Return Temp of 182.5° F. (second T in TFT) →the affected RCP Isolation Valve will also close (first T in TFT)

Answer 24

CCW flow from any of the following isolates when the chiller is placed in STBY: →UPS →CRAC →Vent Chillers →Safety Chillers

Answer 25

flow is ≥ 3200 gpm for 30 secs.

Answer 26

EOP-0.0 Attachment 9 directs isolating non-essential loads if flow is >17,500 gpm to prevent runout

Answer 27

ABN-502 directs a reactor trip followed by a trip of all RCPs

Answer 28

...the pump is taken to start and the pump does not start.

Answer 29

→Ventilation Chiller Condensers 1-4 @ 2000 gpm →Hydrogen Recombiner Heat Exchangers, 1 @ 10 gpm →Waste Gas Compressor Seal Coolers, 1 @ 50 gpm →Spent Fuel Pool Heat Exchangers, 1 @ 4000 gpm →Letdown Heat Exchanger, 1000 gpm @ max temp →Excess Letdown Heat Exchanger, 260 gpm →Reactor Coolant Drain Tank Heat Exchanger, 225 gpm →Seal Water Heat Exchanger, 375 gpm →Reactor Coolant Pump Packages, 4 @ 535 gpm each →PD Charging Pump Hydraulic Coupling Oil Cooler and Lube Oil Cooler, 81 gpm →Process Sample Coolers, 60 gpm →Instrument Air Packages, unit compressors #1 & #2 @ 43 gpm each (when operating) →BTRS Letdown Chiller Package Condenser, 1 @ 415 gpm (not used) →Boron Recycle Evaporator Package, 780 gpm →Waste Evaporator Package, 780 gpm →Floor Drain Evaporator Package, 780 gpm

Answer 30

Level Lo Alarm: Unit 1: ≤ 65% Unit 2: ≤ 46% →CAUTION: IF RMUW is used to makeup to the CCW Surge Tank while a blended flow to the VCT is in progress, THEN an inadvertent boration of the RCS could occur (bigger problem with U1 RMUW Pump than common) →u-LV-4500 and u-LV-4501 should automatically close on a Surge Tank high level →u-HS-4500-1, CCW Surge Tank RMUW Supply Valve must be manually closed; there is an alarm on MCB when open

Answer 31

→Unit 1 IACs have one trim cooler cooled by CCW, and cooling is in series through IAC 1-02 first, followed by 1-01. →trim cooler → IAC 1-02 → IAC 1-01 →Unit 2 IACs have cooling in parallel with one trim cooler each for IAC 2-01 and 2-02, cooled by CCW (common IACs X-01 & X-02 cooled by TPCW)

Answer 32

Both trains of CCW must be operable in Modes 1-4 →one train inoperable: restore within 72 hrs (or RICT) →can't restore: mode 3 in 6 hrs, mode 5 in 36 hrs Note: if any RHR train is made inoperable by CCW inoperability, must enter LCO 3.4.6

Answer 33

...5 times in one minute, per OWI-206 (jog type MOVs)

Answer 34

Unit 1: →Train A: CRAC X-01 →Train B: CRAC X-03 Unit 2: →Train A: CRAC X-02 →Train B: CRAC X-04

Answer 35

→X-01 and X-02 normally supplied by U1 →X-03 and X-04 normally supplied by U2 →If X-01 and X-02 need to be supplied by U2, then all four must be supplied by U2 →If X-03 and X-04 need to be supplied by U1, then all four must be supplied by U1 (avoids cross-tying units when chillers are not in normal alignment)

Answer 36

→fail closed AOVs →open on low flow 8200 gpm, close at 8600 gpm, measured at CCW HX outlet with pump running →fail closed on SI →function restored by resetting SI and resetting valves with reset pushbutton at BOP ARR 1 & 2

Answer 37

→CCW Pump is allowed 2 starts from ambient →must be a 45 minute standing period between any additional starts →allowed one immediate restart from operating temperature →15 minute running period between any additional restart attempts

Answer 38

→flow rates on CCW system may not exceed 17,500 gpm per pump (HX + recirc)

Answer 39

Modes 4-6 for additional cooling once RCS <400° F

Answer 40

→motor air cooler →bearing lube oil reservoir coolers →thermal barrier HX →limits heat from RCS to pump bearing and shaft

Answer 41

→CVCS & CCW most common →Rx power up, surge tank level up, leak is in Seal Water HX →Temp on thermal barrier up, RCS leaking through thermal barrier

Answer 42

CLOTH →C - coolable core geometry shall be maintained, i.e. the core can be cooled →L - long term cooling will be available to maintain core cooling after an ECCS operation and be able to remove decay heat for a extended time period (1 year w/o significant maintenance) →O - oxidation of cladding (17%) shall not exceed 0.17 times the total cladding thickness before oxidation →T - temperature of cladding shall not exceed 2200°F →H - hydrogen generation shall not exceed 0.01 (1%) times the hypothetical amount that would be generated if all fuel cladding were to react with water or steam

Answer 43

All ECCS equipment is designed to perform its function for at least one year without any significant periodic maintenance The Emergency Core Cooling System is designed to remain functional after a Safe Shutdown Earthquake

Answer 44

→Shutoff head is ~ 1558 psid →Intermediate Head Injection at 1520 psig →Recirculation Valves 8814A and B are both Train A power supplies →Recirculation valve 8813 is powered from Train B →Alarm occurs if SIP Suction valve (8806) not open above P-11, followed by another alarm 45 mins later if valve still not open →auto starts on SI and SIS (no auto start on BO) →trips on bus undervoltage, 86M lockout on motor breaker from overcurrent

Answer 45

→begins flow at ≈200 psig (approx shutoff head) →≈4900 gpm at depressurized →minimum flow required for seals = 500 gpm →auto-starts on SI with SIS (NO auto-start on blackout) →receives BOS auto-lockout for 109 sec

Answer 46

→623 - 644 psig, pressurize with N2 →boron concentration 2300-2600 ppm →39% - 61% level per TDM (6119 gal to 6597 gal) →Alarm occurs if outlet valves not open above P-11 (1960 psig), followed by another alarm 45 minutes later if valves still not open →assumed that 3 accumulators will inject and fill reactor downcomer, lower plenum, and half the core while 1 accumulator will spill out onto the floor Note: accumulator pressure can vary with changes in level or temperature. For this reason, level should always be adjusted before adjusting pressure.

Answer 47

Modes 1-4 →Temp: 40°F to 120°F, fix within 8 hrs →Boron: 2400-2600 ppm, fix within 8 hrs →Level: 473,731 ( >95% per TS Bases), fix within 1 hour Note: If low temp alarm comes in (≈45°), recirc through containment spray pumps to warm it up.

Answer 48

→level indication on MCB from 808' - 817.5' →level probes are heated RTDs →trash racks on 3 sides, removed on wall side to ensure debris level against the trash racks doesn't stop flow to strainers →strainers have 0.115" openings to ensure particles large enough to block flow through the reactor core or the Containment Spray nozzles are not allowed into the sump

Answer 49

→Flowpath from RWST thru all pumps to cold legs →Separate 12" suction header for CCPs →SIPs, RHR Pumps and CS Pumps tap off separate 24" suction header

Answer 50

→Once RWST reaches 33% (2 of 4) and RHR Auto Swapover Permissive met (SI Signal generates this) then CNTM Sumps suction valves 8811A/B automatically open →RHR Pump RWST suction valves 8812A/B are manually closed →Without CCW available to RHR HX the effected train can only be used for injection phase, per bases in EOS-1.3 should not pump water >120°F without CCW

Answer 51

→3 hours after initiating event swap to hot leg injection →Done to minimize boron precipitation on top of fuel and minimize boiling at top of core →A single RHR pump discharge valve is closed (8809A or B), not a concern since flow is still available thru CCPs and SIPs along with auto mini flow recirculation →Swap between cold and hot leg recirculation every 24 hours or as directed

Answer 52

SIP RWST recirc valves closed (8814A and B OR 8813) AND CCP RWST recirc valves closed (8511A or 8512B AND 8511B or 8512A) AND Hot leg Recirc Valves closed (8701A or 8702AAND 8701B or 8702B)

Answer 53

→Hot leg Recirc Valves closed (8701A or 8702AAND 8701B or 8702B) AND →RSWT Suction Valves closed (8812A/B)

Answer 54

CNTMT Sump Suction valve closed (8811A/B)

Answer 55

→required to be open and de-energized when RCS >1,000 psig →auto-open on SI signal or P-11 (1960 psig) →inject from 650 psig down to 200 psig →keyed switches however the key only prevents closing the valve, the valve can be opened at any time in manual →Accumulator fill line valves (8964, 8888 and 8871 close on phase A)

Answer 56

→8804A and B must be closed (RHR to SIP and CCP suction) AND →LCV-112B or C must be closed (VCT outlet to CCP suction)

Answer 57

8804A and B must be closed (RHR to SIP and CCP suction)

Answer 58

8804A and B must be closed (RHR to SIP and CCP suction)

Answer 59

→P-11 (1960#) OR →SI Signal

Answer 60

→causes 8811 A/B to open - containment sumps to RHR suction →occurs at RWST Level < 33% (2/4) if SI signal present →relay is energize to actuate - auto-switchover would not occur if there's a loss of power

Answer 61

→Rod Ejection Accident: leads to LOCA and reactivity event →Large Break LOCA - Pipe breaks in the Reactor Coolant System which cause leakage greater than the capacity of the normal makeup system, up to and including the instantaneous double ended severance of the largest diameter pipe in the RCS →Faulted S/G - shrinkage of the reactor coolant from the rapid cooldown due to a steam or feed line break, up to and including the instantaneous rupture of the largest pipe in the steam system (positive reactivity also added due to temperature reduction →S/G Tube Rupture

Answer 62

10CFR50: →one active failure allowed during injection phase →one active OR passive failure allowed during long-term recirculation, 24 hrs →worst case single active failure is a loss of a Safeguards Bus Definitions: →active failure is a "malfunction, excluding passive failures, of a component that relies on mechanical movement to complete its intended function upon request." →passive failure is "a failure of a component to maintain its structural integrity or the blockage of a process flow path." (defined by ANS 58.9 "Single Failure Criteria for Light Water Reactor Safety Related Fluid Systems")

Answer 63

Flow estimates on large break LOCA: ≈14-15 minutes to get to 33% with approximately 22,000 gpm flowing out →CS Pumps: 3,000 gpm/pump for total of 12,000 gpm →RHR Pumps: 4,000 gpm/pump for total of 8,000 gpm →SI Pumps: 700 gpm/pump for total of 1,400 gpm →CCPs: 300 gpm/pump for total of 600 gpm

Answer 64

→Low PZR pressure 1820 psig (2/4), can be manually blocked

Answer 65

CVCS: →CCPs start (time 0 on SIS) →LCV-112D & 112E RWST to CCP suction valves open →8801A & 8801B CCP discharge valves open →8105 & 8106 charging flow isolation valves close →LCV-112B & 112C CCP suction from VCT close (once 112D or E full open) →H2 and N2 supply valves to PDP suction stabilizer close →8110 & 8111 normal CCP miniflow close →8511A & 8511B alternate CCP miniflow valves open SI: →SI pumps start (time 5 sec on SIS) RHR: →RHR pumps start (time 10 sec on SIS) SI Accumulators: →accumulator isolation valves receive open signal BUT are maintained open and de-energized when RCS >1,000 psig Spent Fuel Cooling: →RWST discharge to SFPC valves close

Answer 66

→SI Accumulators - 2300-2600 →RWST - 2400-2600

Answer 67

→shutoff head 2590 psig →lube oil cooled by SSW →high head injection 2485 psig (recirc relief to RWST lifts at 2200#) →auto-start on SI with SIS, BOS →trip on bus undervoltage, 86M on motor breaker from overcurrent

Answer 68

→RHR pumps trip and do not sequence back on with the BOS →RHR Pumps have Operator Lockout →CCPs and SIPs lose their suction source (SIPs also trip on BO and don't restart) →must turn off CCPs to prevent damage →would have to manually restart RHRPs after BOS OL times out, and then restart CCPs

Answer 69

No. If we open more than one vent valve (8875A-D) or fill valve (8878A-D) at the same time, we make all the accumulators inoperable and enter Tech Spec 3.0.3.

Answer 70

...injection phase. should not pump water >120° without CCW

Answer 71

→2 consecutive starts at ambient temperature →1 consecutive restart attempt at operating temperature →subsequent starts require 15 mins running time or 45 mins standing time in between

Answer 72

→RHR Cold Leg Injection Valves (8809A/B) →RHR Hot Leg Injection Valve (8840) →SIP Hot Leg Injection Valves (8802A/B) →SIP Cold Leg Injection Valve (8835) →SIP Suction Valve (8806) →SIP Recirculation Valve (8813) →RHR loop crosstie valves (8716A/B) - included, but not keyed

Answer 73

Two trains shall be operable in MODES 1‐3 →exception allowed to isolate both SI flowpaths for 2 hours for valve testing in MODE 3 When coming up to NOP/NOT from shutdown: →both SI pumps required to be inoperable below 350°F for LTOP →therefore, SI pumps must be inoperable while changing from Mode 4 to Mode 3 →allowed for 4 hours OR before RCS temp >375°F, whichever comes first →one train of CCP inop - 7 days to restore →one or more train inoperable other than CCP but you can still guarantee 100% ECCS flow - 72 hours

Answer 74

One ECCS train shall be operable in MODE 4 →an RHR train in SDC can be considered operable for this spec →assumes train can be realigned to the injection flowpath →concerned with RHR suction temperature and voiding when realigned to the RWST →cannot consider RHR in shutdown cooling for this spec when temperature is >200F →SIPs are not required in this spec due to requirements of LTOP →one train RHR inop - immediately take action to restore to operable →one CCP OOS - restore within 1 hour

Answer 75

Seal injection flow shall be <40gpm when RCS pressure is between 2215 psig and 2255 psig →applicable in Modes 1‐3 →restore in 4 hours or shutdown →concerned with adequate ECCS flow on an SI

Answer 76

Two flowpaths required operable in Modes 1‐4 →required to be manually aligned in 15 minutes →administratively controlled if field actions required for alignment

Answer 77

→containment sumps - heated RTDs →RVLIS - heated thermocouples

Answer 78

→SI Signal in conjunction with SIS on step 4 (No start on BOS) →CS initiation signal (Hi-3 Cntmt Pressure 18.2 psig or Manual)

Answer 79

→CS initiation signal →Close on a low level in the Chem Add Tank (~13%) →follows normal power supply/train convention

Answer 80

→normally open →fail open on loss of air or power →Lo-Lo level in the Chem Add Tank (~6%). →Power supply from opposite train

Answer 81

→auto close when Train related HV-4782/4783 (Sump Suction) begin to open →auto close when Train related HV-4776/4777 (CIVs to Header) begin to open →auto open on low discharge flow (< 1090 gpm) if the above valves are closed →auto close on hi discharge flow (> 1210 gpm)

Answer 82

→CS initiation signal (2/4 Hi-3 Cntmt or Manual) →valves are designed to slowly open (takes ~ 110 secs) to prevent pump runout while spray header fills.

Answer 83

→CS initiation signal (2/4 Hi-3 Cntmt or Manual) →valves fully open, then throttle back to 55% of HX design flow →if valves are already throttled to >55% design flow, they will only throttle down to 55%; will not go full open first

Answer 84

→NaOH concentration must be between 28% - 30% by weight →Level must be maintained 91% - 94%. →1-4 psig N2 overpressure

Answer 85

2 trains required in modes 1 - 4

Answer 86

→Boron 2400-2600 ppm (restore in 8 hrs) →Level > 95% or 473,731 gallons (restore in 1 hr) →Temp 40 -120˚F (restore in 8 hrs; if too cold, heat by recirc through CSPs)

Answer 87

→Manual (2 of 2 H/S) →HI-3: 18.2 psig (2 of 4)

Answer 88

→Swapover to ctmt sump recirc is done when RWST is < 6%. →System must be manually swapped. (EOS-1.3) →cooling is required in recirc mode

Answer 89

→auto open at 1090 gpm (decreasing flow) →auto close at 1210 gpm (increasing flow) →auto close when containment sump suction valves (isolate RWST from sump) or HX outlet valves (prevent runout) begin to open; interlock overrides flow interlocks

Answer 90

→Design Pressure: 50 psig →Design Temperature: 280°F →Maintain containment within these limits while also removing Iodine.

Answer 91

→MSL Break inside containment →FW Line Break inside containment →LOCA

Answer 92

→sodium hydroxide (NaOH) is used to raise pH in the containment sumps to a level more conducive to absorption and retention of radioactive iodine →raising pH in the sump reduces corrosion of components in Containment, which minimizes hydrogen production →pH raised from 4.6 to 7.1

Answer 93

Operators are expected to preemptively actuate ESF signals if plant conditions indicate they will auto-actuate, with the exception of Containment Spray.

Answer 94

...taken to pullout due to runout concerns.

Answer 95

to reduce time until spray begins

Answer 96

→~500,000 gallons each, one per unit →Hi alarm >97.89% →TS required level >95% →Lo alarm <92.83% →Lo-Lo alarm <33% →Empty alarm <9% →Low temp alarm 45° F

Answer 97

→SI causes CSP start and run in recirc →recirc happens before HX →eductor flow path is open, but chem add tank MOV isolations stay closed

Answer 98

→separate bearing coolers (SSW cooled) and seal coolers (safeguards CCW cooled) →when one train related pump is OOS, take other pump to pullout →if one pump in a train trips during spray, ensure other pump parameters are good and allow remaining pump to continue running →system designed to operate with system temp up to 300° F; when system temp >150° F, CCW flow must be aligned to pump seal coolers to maintain integrity of mechanical seals →auto-start on SIS step 4, Hi-3 containment pressure 18.2 psig; no start on BOS →trip on sustained bus undervoltage, 86M phase overcurrent lockout (white light on handswitch)

Answer 99

→RHR boron concentration is greater than OR equal to RCS boron concentration OR →Both RHR and RCS boron concentrations are greater than 2400 ppm OR →RHR boron concentration is greater than required cold shutdown boron concentration AND at least one RCP (1 or 4 preferred) is operating.

Answer 100

INCREASE The loss of RHR Pump discharge pressure will cause PCV-131 (if in AUTO) to close and raise pressure.

Answer 101

8811, Containment Sump to RHR Pump Suction Valve must be closed →normally open when in standby →powered from uEB3-1 (Tr A) and uEB4-1 (Tr B) →can be used to fill refueling cavity when shut down

Answer 102

Interlocks: →8812 closed - RWST to RHR Pump Suction →8701 or 8702 closed - Loop Suction Isolation Valves must be closed Other Info: →auto open on Lo-Lo RWST level 33% with SI signal (both blue lights on panel) →relief valve lifts at 475 psig →powered by uEB3-2 (Tr A) and eEB4-2 (Tr B)

Answer 103

→u-8811A/B closed - Containment Sump to RHR Pump Suction Isolation Valve →u-8812A/B closed - RWST to RHR Pump Suction Valve →u-8804A/B closed - RHR Pump to CCP/SIP Suction Valve →RCS pressure from u-PT-405/403 must be <364 psig →interlocks bypassed if opening from Remote Shutdown Panel

Answer 104

→u-8701A/B OR u-8702A/B closed - one of the RHR Pump Hot Leg Recirc Valves →u-8814A&B OR u-8813 closed - SIP 1 & 2 Miniflow Valves (8814s) OR the SIP Miniflow Return Valve (8813) →u-8511A OR u-8512B closed - CCP 1 Alternate Miniflow Isolation Valve →u-8511B OR u-8512A closed - CCP 2 Alternate Miniflow Isolation Valve

Answer 105

→auto starts on Safety Injection with SIS (at 10 sec) →trips on undervoltage or overcurrent (instantaneous or delayed)

Answer 106

One RHR loop shall be OPERABLE and in operation in MODE 6 with the water level ≥ 23 feet above the top of the reactor vessel.

Answer 107

Two RHR loops shall be OPERABLE and one RHR loop shall be in operation in MODE 6 with the water level < 23 feet above the top of the reactor vessel flange

Answer 108

→Closing either train cross connect valve u-8716A or -B in MODE 1, 2 or 3 will render both trains of RHR INOPERABLE. →Closing either cold leg injection valve u-8809A or -B in MODE 1, 2 or 3 will render both trains of RHR INOPERABLE. OR →Opening hot leg injection valve u-8840 →Opening RHRP discharge to RWST isolation valve u-8717 (alarms on SSII if not closed)

Answer 109

the RWST reaches its LO-LO alarm at 33% level and RHR swap over permissive (blue light) in, indicating SI signal is present.

Answer 110

→put in service <350°F and <350 psig (per IPO-005) →suction piping limited to <350°F and <400 psig →RCS pressure from u-PT-405/403 must be <364 psig before valves can be opened

Answer 111

→ >120°F then recirculation mode is not possible (EOS-1.3 Bases) → >150°F fluid then CCW must be supplied to the mechanical seals (SOP-102 Notes).

Answer 112

→8701A/B are A Train Electrical →8702A/B are B Train Electrical →Mechanical A for A, B for B

Answer 113

→ >shut off head and increasing →if pressure decreases to <325 psig (425 psig adverse) the pumps need to be restarted

Answer 114

→fails closed on loss of air or power →full open on RHR letdown operation w/pressure controlled by PCV-131

Answer 115

→2 RHR suction reliefs (lift @ 450 psig ± 3%), or →2 PORVs, or →1 of each →0 SI pumps capable of injecting →2 charging pumps capable of injecting →0 accumulators capable of injecting If these requirements are not met, then the RCS must be depressurized and a 2.98 sq in vent path must be made in the RCS pressure boundary.

Answer 116

≤ 320°F

Answer 117

1. render all SIPs and one charging pump incapable of injection 2. close and deactivate SI accumulator discharge valves 3. preclude the start of RCPs if secondary water temperature is > 50°F above primary

Answer 118

1. at least 1 RCP operating 2. PZR level ≤ 92% 3. Plant heatup rate is limited to 60°F per hour Note: LTOP will still arm ≤350°F

Answer 119

Two ECCS trains shall be operable (Modes 1-3) →ECCS trains are CCPs, SIPs, RHRPs and piping →SI Accumulators and RWST not considered part of the LCO →all ECCS subsystems credited for LOCA Note: operation in Mode 3 with ECCS pumps made incapable of injecting per LTOP (LCO 3.4.12) is allowed for up to 4 hrs or until temp of all 4 cold legs >375° F, whichever comes first.

Answer 120

One ECCS train shall be operable (Mode 4) →an operable train is CCP and RHR (doesn't include SIP) capable of taking suction from RWST and swapping to sump →an RHR train is operable when aligned for shutdown cooling if capable of being manually realigned to ECCS →if RHR subsystem inoperable, take action to restore immediately →if CCP subsystem inoperable, restore within 1 hr

Answer 121

→RHR pumps trip and do not sequence back on with the BOS →RHR Pumps have Operator Lockout →CCPs and SIPs lose their suction source (SIPs also trip on BO and don't restart) →must turn off CCPs to prevent damage →would have to manually restart RHRPs after BOS OL times out, and then restart CCPs

Answer 122

RHRPs, SIPs, and CCPs

Answer 123

→500 gpm minimum →outlet of RHR HX to suction of RHR Pump →FT on pump discharge →opens at 746 gpm →closes at 1402 →powered from uEB1-1 (610) and uEB4-1 (611)

Answer 124

→full open in standby →fail open on loss of air or power uPC1/uPC4

Answer 125

→controls total system flow to 3950 gpm →normally closed when in standby; maintained in manual and closed with 0% demand →fail closed on loss of air or power →powered through uPC1 and uPC4 with backup from uC1 (from process control cabinet 05/06)

Answer 126

→suction from hot legs 1 & 4 →through 8701 & 8702 →through RHR HX (cooled by CCW) →back to train related cold legs (Tr A = CL 1 & 2, Tr B = CL 3 & 4) →PCV-131 in CVCS used to control RCS pressure when shutdown

Answer 127

→pumps auto start on SIS (at 10 sec) →suction from RWST through 8812s →3800 gpm through each pump with RCS <200 psig →through RHR HX (cooled by CCW) →both trains inject to all 4 cold legs →cross connect valves (8716s) between CLs 1&2 and CLs 3&4 normally open so that one pump can supply all 4 cold legs

Answer 128

→RWST drops to Lo-Lo 33% →suction swaps to containment recirc sump →suctions to CCPs and SIPs tap off between RHR HX outlet and FCV →still injects to all 4 cold legs

Answer 129

→hot legs 2 & 3 →suction for shutdown cooling is off of hot legs 1 & 4, so it can't also inject into those legs

Answer 130

→bring plant from 350° F to 140° F in 24 hrs →single train able to remove residual heat once Rx has been shut down for 150 hrs →low head ECCS injection

Answer 131

→CCW pump room emergency fan coil units →CCP room emergency fan coil units →Spent fuel pool heat exchanger and pump room emergency fan coil units. Fan coil units are common equipment. Can be supplied from either unit. →SI pump room emergency fan coil units →Containment Spray pump room fan coil units →RHR pump room emergency fan coil units →Aux Feedwater pump room emergency fan coil units →Electrical switchgear area emergency fan coil units* →Uninterruptable Power Supply (UPS) FCUs (hurricane blowers)-Local HS controlled Note: All EFCUs will start when their associated equipment starts for any reason except for Electrical switchgear units which start directly from SI or BO

Answer 132

→In auto starts first when chiller demanded to start, 30 secs after oil pump starts the chiller starts →Oil pump shuts off 45 secs after chiller starts →Auto starts on chiller trip

Answer 133

→Safeguards CCW cools condensers →20-300 gpm →control valve has an accumulator to continue operation for 30 minutes following loss of air

Answer 134

→SI →BO →Associated Recirculation Pump starts

Answer 135

→LO oil pressure →LO evaporator pressure →HI condenser pressure →HI motor temperature →HI discharge temperature →Motor overload →HI oil temperature

Answer 136

→LO chilled water temperature →LO CCW flow →LO chilled water flow

Answer 137

Safety Chillers provided with "Anti-Recycle" feature that prevents chiller restart for 30 minutes after chiller S/D bypassed on SI or BO restart

Answer 138

→Aux oil pump running (chiller won't start until 30 secs after LO Pump starts) →Chill Water Pump running →Anti-Recycle timer timed out

Answer 139

→SI →BO →Start of train related CCW Pump →Only Recirc pump 5 can be controlled from RSP →300 gpm ea, P/S uEB3-1, uEB4-1

Answer 140

→Partition plate splits out tank at 88% level →HV-6719 (Demin Water) normally closed, HV-6720 (RMUW) normally open, no automatic operation for either valve →Train related fill valves LV-6712 and LV-6713 open and closed based on tank level

Answer 141

Two UPS HVAC System Trains shall be OPERABLE (Modes 1-4) 1 hour or less, actions LCO 3.7.20.A one UPS HVAC System train inoperable →A.1: Verify the affected UPS & Distribution Room is supported by an OPERABLE UPS A/C Train immediately AND →A.2: Restore the inoperable UPS HVAC train to OPERABLE status within 30 days

Answer 142

One or more areas exceeds the normal temperature for more than 8 hours then restore according to CAP and complete analysis immediately.

Answer 143

Electrical Switchgear Area Emergency Fan Coil Units shall be OPERABLE in MODES 1-4. If one or more is inoperable, the LCO allows you to either: 1. Declare Safety Chilled Water train(s) inoperable and enter TS LCO 3.7.19 (Immediately), or 2. Declare affected fan coil unit(s) and their support equipment inoperable (Immediately)

Answer 144

→chiller local handswitch in start with chill water recirc pump H/S in auto (after stop) position keeps chiller in standby →manual or auto start of Chill Water Recirc Pump provides start signal for Chiller →Once Recirc pump starts and chill water min flow interlock met, then chiller oil pump kicks on and runs for 30 sec. After that, chiller starts.

Answer 145

Control CCW flow to maintain chiller condenser pressure. Valves are air open and an air accumulator is provided which ensures operation for 30 minutes following loss of inst. air.

Answer 146

Chiller has minimal load during normal ops (ΔT ≈ 10° F), so a hot gas bypass valve is installed to artificially load the chiller to ensure proper circulation of lube oil through system. Otherwise, lube oil would drain to lower area of evaporator and remain there, starving the rest of the chiller for lubrication. Works by cycling hot gas from discharge of compressor to evaporator HX.

Answer 147

→locally controlled with manual handswitch →SI - don't get shunt tripped, so continue running →BO - switches remain in start, so restart once power is restored

Answer 148

→control power to compressor oil heaters must be energized for 12 hrs OR →oil temp >107° F for at least an hour OR →compressor oil was changed within the last hour

Answer 149

Two safety chilled water trains shall be operable in Modes 1-4 →one train inoperable, restore within 72 hrs or RICT; if not, Mode 3 in 6 hrs, Mode 5 in 36 hrs →two trains inoperable, LCO 3.0.3 immediately

Answer 150

Lift coil disconnect switch provided for each rod and contained in a single cabinet in the back on the MCB CB07. These switches allow disconnecting the lift coil to prevent a rod from moving. Provides ability to withdraw a single rod for dropped or misaligned rod. Toggle switch UP to disconnect.

Answer 151

CBO: Process of moving all control banks in or out over core life to minimize wear to the rodlets. Also done to minimize fretting of the rods. The total span used is 9 steps. 1. Offset of 1 raises rod height by 1, 2 raises 2, etc. 2. 222+0, 223+1, 224+2, 225+3, 226+4....231+9

Answer 152

The Metal Impact Monitoring Systems function is to prevent the Loose Parts Monitoring System (LPMS) from inadvertently generating an alarm when the rods are stepped.

Answer 153

→uPC1 failure will cause T-ref to drop due to loss of PT-505 →rods drive inward in auto

Answer 154

In Manual: →control banks move at 48 steps/min →shutdown banks move at 64 steps/min (only when that individual bank is selected on switch) →Reactor Control System provides input to Rod Control to tell rods what to do based upon plant conditions (Rod Bank Selector Switch must be in auto) →rod speed indication for SB-C, D and E reads 0, but they actually move at 64 steps/min

Answer 155

Non-Linear Gain looks at error signal and changes rod speed based upon amount of error.

Answer 156

→Variable Gain compares turbine power to error signal and for higher power levels it decreases the rod speed to minimize potential overshoot →at lower power levels it may increase the rod speed →compares Auctioneered Hi NIS and Turbine 1st Stage Impulse Pressure (PT-505 or PT-506, selectable), then goes through rate comparator to develop power mismatch function (may cause rods to change speed based on rate mismatch)

Answer 157

→C1: stops any outward rod motion, IR Rod Stop IR Amps ~ 20% (1/2) →C2: stops any outward rod motion, PR Hi Flux 103% (1/4) →C3: stops any outward rod motion, OT N16 (2/4) 3% below trip setpoint →C4: stops any outward rod motion, OP N16 (2/4) 3% below trip setpoint (109% normal) →C5: stops only automatic outward rod motion, Turb Pwr < 15% (1/1) (PT-505 or 506, selected via switch on CB-07) →C11: stops only automatic outward rod motion, CB-D > 223 steps

Answer 158

→auctioneered Hi N-16 goes to Rod Insertion Limit monitor (graph available in COLR) →supports Tech Specs →compares rod position to power to determine if rods are too far in and provides alarm →auctioneered Hi NIS used to compare to Turbine 1st stage impulse pressure to generate power mismatch →Average T-ave compared to T-ref to develop error signal →Reference T-ave (a.k.a. T-ref) supplied from 1st Stage Turbine Impulse Pressure (PT-505 or PT-506, Selectable)

Answer 159

→RTBs are the only safety related components of Rod Control →bypass breakers DO NOT get shunt trip on automatic trip signals →bypass breakers get a shunt trip AND UV trip on manual only →main breakers have both shunt and UV trip on automatic as well as manual →SSPS A Train goes to RTA and BYB, B Train goes to RTB and BYA →with an SSPS train in test, its associated RT breaker can be tested without causing a reactor trip (auto trip signals will open the breaker) while Bypass breaker is connected →BUT... all breakers will open on a manual trip Note: loss of uED1 or uED2 will prevent shunt trip, but UV trip will still be available.

Answer 160

Shunt Trip: once energized, uses mechanical force to force breaker open UV Trip: once de-energized, releases spring to force breaker open

Answer 161

→DC Hold power applies DC hold voltage to the stationary gripper coil to hold the rods such that when normal power to the stationary gripper is removed, the rods stay in position →Group Hold Switch positions: OFF, LATCH, and HOLD →Latch is 125 VDC; Hold is 70 VDC →Latch position applies greater voltage to ensure stationary gripper is properly latched →only one group can be held at a time, only one not in OFF at a time

Answer 162

→107 steps of bank overlap, done to control flux shape and even out rod worth →107 steps of overlap means 2 banks are moving together for 107 steps →individual thumbwheels provided (total of 6) are set to tell when to start and stop rods from moving based upon total number of steps counted →115 step overlap means when CB-A at 115 steps, CB-B starts to step (0 with all control banks in, 452 control bank C all the way out, adjusted in + direction only if required to adjust manually) 1. S1: 115 steps on CB-A, start CB-B 2. S2: 222 steps Stop CB-A, CB-B at 107 steps 3. S3: 230 steps start CB-C, CB-B at 115 steps 4. S4: 337 steps stop CB-B, CB-C at 107 steps, CB-B at 222 steps 5. S5: 345 steps start CB-D, CB-C at 115 steps 6. S6: 452 steps stop CB-C, CB-D at 107 steps, CB-C at 222 steps 7. With CB-D all the way out counter should read 560 steps (no CBO) 8. If reset then it sees that CB-A needs to be first moved (not good at power) 9. Bank overlap and step overlap only affects control banks

Answer 163

→provides input along with Auctioneered Hi N-16 to RIL monitor →individual slave cyclers send signals to P/A Converter in order for it to track bank position →since it only tracks signals, indication could be incorrect if signal is sent and rods do not actually move →toggle switches on front of converter allow for manual adjustment of bank rod position →located in back of DC Hold cabinet, only tracks control banks

Answer 164

→located on CB-07 →should never be used with rods pulled - resets the entire system, which will require manually resetting each individual counter, Master cycler, Bank overlap, etc. →does not cause a reactor trip, just a headache; rods will stay in place →no effect on DRPI →used to reset the rod control system prior to startup →if not reset prior to startup, Bank Overlap unit will not work as designed Resets the following (POSSUM): P- P/A converter, O- Bank Overlap, S- Slave Cycler, S- Step Counters, U- Urgent Alarms, M- Master Cycler

Answer 165

If failure is in logic cabinet, it stops rods in all power cabinets except SCDE

Answer 166

LLRPM →Logic failure: simultaneous zero current order to stationary and movable grippers →Loose or removed circuit card →Regulation failure: coil current does not match the current order within a preset time or a full current order is on too long. This protects against dropping rods or overheating the coils →Phase failure: voltage to coils has excess ripple. This would mean that one of the three phases of AC was being processed differently than the others, perhaps due to a blown fuse, a thyristor that has lost gate control, etc. →Multiplexer error: wrong rods trying to move- locks up rods in that cabinet

Answer 167

SLO Stops all rods except SCDE from moving →Slave cycler Failure: slave cycler receives a "GO" pulse before completing the previous step, initiates a step without receiving a "GO" pulse, or receives a "GO" pulse without initiating a step →Loose or Removed circuit card →Oscillator Failure: fails to generate pulses when signaled

Answer 168

Loss of a power supply (Logic or Power Cabinet). Amber light (PS) provided on locally on each cabinet; alarm provided on CB-07

Answer 169

When CB A rods clear 12 steps withdrawn

Answer 170

→Bank position from P/A converter →Auctioneered High N-16 →Ave T-ave (set to zero)

Answer 171

→the magnitude of the difference between turbine load (T-ref) and Ave T-ave AND →the RATE OF CHANGE between turbine load (1st stage impulse pressure) and Auctioneered Hi NIs.

Answer 172

Control Bank B group 1 Control Bank D group 1 Shutdown Bank B group 1

Answer 173

Fall by gravity into the core. The DC hold power is supplied from the Rod Drive MG sets DOWNSTREAM of the RTB's

Answer 174

→Control rods will step in due to the auctioneered HIGH input to the rod control circuitry. →C-2, power range high flux rod stop, will prevent rod withdrawal →must be reset at the NI cabinets

Answer 175

No, T-ave should be 569.9°F. Rods should be stepping out at ~68 steps per minute.

Answer 176

T-ave for 65% on U1 should be ~575.5°F. Rods should step in at ~40 steps per minute.

Answer 177

steam pressure

Answer 178

Modes 1 and 2 All shutdown and control rods shall be OPERABLE AND Individual indicated rod positions shall be within 12 steps of their group step counter demand position. Note: the operability (i.e. trippability) of the shutdown and control rods is an initial assumption in all safety analyses that assume rod insertion upon reactor trip. One or More Rods Inoperable: →verify SDM within COLR limits within 1 hr OR →initiate boration to restore SDM within 1 hr AND →Mode 3 in 6 hrs One Rod Not Within Alignment Limits: →verify SDM within COLR limits within 1 hr OR →initiate boration to restore SDM within 1 hr AND →reduce thermal power to ≤75% RTP within 2 hrs More Than One Rod Not Within Alignment Limits: →verify SDM within COLR limits within 1 hr OR →initiate boration to restore SDM within 1 hr AND →Mode 3 in 6 hrs

Answer 179

Each shutdown bank shall be within insertion limits specified in the COLR (Modes 1 and 2 with any control bank not fully inserted) . Each shutdown bank shall be within 218 and 231 steps withdrawn in MODE 1, and in MODE 2 with any control bank not fully withdrawn. This LCO is not applicable during the performance of OPT-106A/B (SR 3.1.4.2) One or More Shutdown Banks Not Within Limits: →verify SDM within COLR limits within 1 hr OR →initiate boration to restore SDM within 1 hr AND →restore shutdown banks to within limits within 2 hrs

Answer 180

Control banks shall be within the insertion, sequence, and overlap limits specified in the COLR (Modes 1 and 2 with keff ≥1.0). This LCO is not applicable while performing SR 3.1.4.2

Answer 181

The Rod Position Deviation Monitor (u-ALB-6D/3.5, DRPI ROD DEV alarm and inputs) shall be operable in Modes 1 and 2. If the DRPI ROD DEV alarm becomes inoperable, rod group alignment, and the operability of the Demand Position Indication System and the DRPI System must be verified every 4 hours. Applicable conditions of LCOs 3.1.4, Rod Group Alignment Limits, and 3.1.7, Rod Position Indication, shall be immediately entered upon discovery of one or more rod position indications inoperable.

Answer 182

The Control Bank Insertion Limit Monitor shall be operable in Mode 1 and in Mode 2 with the reactor critical. The Control Bank Insertion Limit Monitor inputs annunciators u-ALB-6D/1.7, ANY CONTROL BANK AT LO LMT, and u-ALB-6D/2.7, ANY CONTROL BANK AT LO-LO LMT, and CONTROL ROD INSERTION LIMIT & POSITION recorders u-ZR-0412 & 0412A. If these indications become inoperable, the position of each control bank must be verified to be within the limits of the COLR every 4 hours. Applicable conditions of LCO 3.1.6, Control Bank Insertion Limits shall be immediately entered upon discovery of control bank insertion limits not met.

Answer 183

...checking power indications and/or incore thermocouples.

Answer 184

→maintain Actual T-ave within 1.5°F of Program T-ave →±1.5°F to ±3°F rods step in at 8 steps/min →rod speed ramps from 8 to 72 steps/min from ±3°F to ±5°F →max rod speed 72 steps/min at ±5°F mismatch →once mismatch is within ±1°F, rods stop moving

Answer 185

→Impulse Pressure is used to determine Rx power as they are directly related →Temperature of RCS is controlled by reactivity (rods and boric acid) →if impulse pressure (PT-505 or PT-506) fails high, (T-ref > Ave T-ave), rods will withdraw →if impulse pressure fails low (T-ref < Ave T-ave), rods will insert →if Average T-ave (N-16 or T-cold) fails high (Ave T-ave > T-ref), rods will insert →if Average T-ave fails low (Ave T-ave < T-ref), rods will withdraw

Answer 186

Withdrawal: →stationary coil normally energized, holding rod →moveable coil energized, grabs rod →stationary coil de-energized, lets go of rod →lift coil energizes, lifts rod 5/8" with moveable coil holding on →stationary coil energizes, grabs rod →lift coil and moveable coil de-energize, lets go of rod and moveable coil drops to original position Insertion: →stationary coil normally energized, holding rod →lift coil energizes, lifting moveable coil up 5/8" →moveable coil energizes, grabs rod →stationary coil de-energizes, letting go of rod →lift coil de-energizes, dropping moveable coil holding onto rod 5/8" →stationary coil energizes, grabs rod →moveable coil de-energizes, lets go of rod

Answer 187

→260 VAC output →powered by uB3 AND uB4 (can lose one and still hold rods) →breakers can be opened from CB-11 in the event RTBs don't open on Rx Trip →have large flywheel to help stabilize output with input power perturbations

Answer 188

→PR NI fails Hi - rods in →PR NI fails Lo - no movement →T-ave/T-cold/N-16 fails Hi - rods in →T-ave/T-cold/N-16 fails Lo - rods out →PT-505/506 fails Hi - rods out →PT-505/506 fails Lo - rods in

Answer 189

Normal Accuracy = ±4 steps if both trains available (+3 between coils plus 1 step for mechanical error) →A Train only available (Failure of Train B) accuracy is -10, +4 →B Train only available (Failure of Train A) accuracy is +10, -4

Answer 190

→rod position will still indicate the same position ( i.e. 12, 24, 36, etc. will also indicate 12, 24, 36, etc.) →rods indicating between multiples of 12 will indicate +6 with A ONLY, and -6 with B ONLY (i.e. 42 will be 48 with A ONLY and 36 with B ONLY)

Answer 191

→Sufficient negative reactivity must be available to achieve the required shutdown margin at all times. →Provide acceptable consequences following a postulated rod ejection accident. →Maintain acceptable radial flux distributions during normal operations

Answer 192

LED provided for every 6 steps of rod travel up to 228 steps

Answer 193

→when any two rods within the same control bank are misaligned by ≥12 steps. →when any shutdown rod is below 210 steps. →urgent alarm

Answer 194

→inputs from N-16 (auctioneered Hi), P/A Converter and Average T-ave (Set to 0) →provides alarm and annunciation when the control banks reach: →automatic withdrawal limit (C-11: Control Bank D ≥223 steps) →Low insertion limits (10 steps above Low-Low limit) →Low-Low insertion limit (D146 @ 100%, C49 @0%) →SD Rods shall be maintained within 218 to 231 steps per COLR

Answer 195

Modes 1 & 2 - if two DRPI lost in one group, place rods in manual IMMEDIATELY and monitor and record T-ave once per hour

Answer 196

Causes: →failure of both A data and B data →difference between A data and B data of more than one coil (>6 steps) →central control card calculates the rod position to be greater than 228 steps (the highest DRPI indicator). Results in: →GW light for affected rod(s) flashing →urgent alarm lights on DRPI →annunciator for urgent alarm comes in

Answer 197

Per TRM 13.1.39, Place the Rod Control System in a condition incapable of rod withdrawal IMMEDIATELY (OPEN RTB's)

Answer 198

This means that the actual position of CB D is between: 212 & 220

Answer 199

→Display control rod position. →Provide alarms to alert the operator in the event of control rod deviation exceeding the preset limit.

Answer 200

→once all rods in shutdown banks and all rods in Control Bank A are off the bottom, the rod bottom alarms are blocked even though Control Banks B, C, D are still on the bottom (during normal startup sequence) →rod bottom alarms will occur if the normal sequence of withdrawal is violated or if a rod actually drops after it has been withdrawn off the bottom.

Answer 201

→bottom LED is rod bottom →the next 38 LEDs represent control rod movement at 6 steps per LED →the last one (top) is for General Warning

Answer 202

Causes: →Data A or Data B failure →accuracy mode switch not in A + B position →pulled central control card →rod deviation card disagreement →pulled rod deviation card Results In: →non-urgent alarm on DRPI and annunciator →affected rod GW light flashing →Half Accuracy →Data A Failure/Data B Only = +10 to -4 →Data B Failure/Data A Only = -10 to +4

Answer 203

→3 for redundancy; all perform the same task →majority vote (2/3) system →if position error is detected in group A then group B position data is used in its place

Answer 204

→2 for redundancy →alarm - any shutdown bank <210 steps →alarm any rod ≥12 steps from bank expected position →urgent alarm

Answer 205

→C-11 Bank D >223 steps from P/A Converter →automatic rod withdrawal stop

Answer 206

1. LOCA 2. Main Steam/Feed Line Break 3. S/G Tube Rupture

Answer 207

→perform the diagnosis specified in the ERGs →take the specified pre-planned manually controlled actions, for which no automatic control is provided, that are required for safety systems to accomplish their safety function in order to recover from the DBA, and →reach and maintain a safe shutdown condition Note: all of the Type A variables are required by the accident monitoring Tech Spec. The other variables may be required by other specifications, but not specifically for accident monitoring

Answer 208

→all Category 1 (RG 1.97) instruments have black labels with white lettering, but not all Category 1 instruments are required by TS 3.3.3 (Modes 1-3) →in other words, all PAM instrumentation (TS 3.3.3) has black labels with white lettering and are Category 1 →there are additional instruments that are category 1 and have a black label with white lettering

Answer 209

→containment pressure >5 psig, or →containment radiation >10^5 R/hr, or →integrated containment radiation dose >10^6 rads (as determined by plant staff) →Once declared, operators must continue using ADVERSE CONTAINMENT parameters unless integrated radiation dose is verified to be less than 10^6 rads.

Answer 210

→subcriticality (reactivity control) →core cooling →heat sink →P - RCS integrity →Z - containment integrity →inventory (RCS)

Answer 211

→provides a means to detect significant releases, determine release assessment, and provide long term surveillance for the plant vent stacks →2 sample flow paths: high flow (low radiation range) and low flow (mid/high radiation range) →normal, continuous operation is with low range path in service and mid/high range path shut down →3 detectors with each having a six-decade range (overlap between ranges) →high radiation signal from the WRGM closes HCV-014 Gaseous Waste Release Valve

Answer 212

Systems designed specifically for accident conditions. →WRGM for plant vent stack →MSL monitor (not SG leak rate monitor) →Containment High Range Radiation monitor (HRRM) →Containment Pressure WR and NR →Containment water level (recirc sump level) →Containment air monitoring (hydrogen concentration)

Answer 213

→specifies requirements for Radioactive Gaseous Effluent Monitoring I & C →WRGM flow rate and sample points →if WRGM is OOS, flow rate is estimated every 4 hrs OR sample every 24 hrs, depending on which aspect of WRGM is OOS

Answer 214

→ALARA to the public →monitor releases

Answer 215

→containment pressure instruments operable →Modes 1-3 →trip or bypass in 72 hrs or Mode 3 in 78 hrs, Mode 4 in 84 hrs

Answer 216

→Modes 1-3 →PAM instruments must be operable

Answer 217

→annunciates if flux increases to 300 cps or 5x background →can be blocked →this alarm also activates containment evacuation alarm

Answer 218

→BF3 Proportional Detector →Rx Trip at 10^5 cps (can block above P-6) →Pulse Height Discriminator: Eliminates pulses due to gamma ionization Note: high voltage switching operations (or lightning) can spike SR detectors, causing trips.

Answer 219

→Compensated Ion Chamber (gamma interactions in both chambers are cancelled out by adjusting voltage of gamma only detector (inner can) →Rx Trip when detector current output = 25% Rx Power →**Overcompensated** (high compensation voltage) causes detector output to decrease (read lower than actual) →**Undercompensated** (low compensation voltage) causes detector output to increase (read higher than actual) Note: if one channel is undercompensated, you may not get the unblock of SR trips; can manually unblock SR trips at CB in this case

Answer 220

→Uncompensated Ion Chamber →amount of gammas compared to amount of neutrons is insignificant →amount of background gammas is directly proportional to power level Nuclear Engineering has estimated that the effect on PR NIS is approximately 0.8 % per degree at 100% power. The effect is decreased proportionally with power. For example at 50% power, the effect is halved or 0.4% per degree.

Answer 221

→Source Range Instrumentation is required in Mode 2 (below P6) through Mode 6 →in Mode 6, only visual count rate indication is required in the Control Room →in Mode 3-5 the T.S. only applies if the Rod Control System is capable of withdrawal and one or more rods not fully inserted.

Answer 222

The Intermediate Range Instrumentation is required in Mode 1 (below P-10) and Mode 2 (above P-6) 1 IR Channel inoperable, Mode 1 (P-6): →reduce THERMAL POWER to P-10 in 24 hours →Mode 2 (P-6): →suspend operations involving positive reactivity additions immediately, and →reduce power to

Answer 223

2 PR Channels Inoperable, enter LCO 3.0.3

Answer 224

any one detector deviating by > 5% of the average of all upper detectors

Answer 225

any one detector deviating by > 5% of the average of all lower detectors

Answer 226

deviating by >5% of the average of all detectors

Answer 227

→approx. 15-18 minutes →10^-10 cps →Startup Rate = -1/3 dpm →approx. 6 decades

Answer 228

→0% power on PR ≈ 10^-5 amps on IR →3 to 5 x 10^4 cps on SR ≈ 10^-10 amps on IR

Answer 229

→action required once ≥1.02 →applicable in Mode 1, >50% →For each 1% QPTR above 1.00, reduce power 3% →verify QPTR every 12 hrs →perform evaluation to allow continued operation →if completion time not met, reduce power to <50% Note: this one is tricky. Action isn't required until 1.02, but you must take the action based on the amount above 1.00

Answer 230

→applicable in Mode 1 >50% →Spec not met when **two or more** PR NIs indicate out of spec →30 minutes to be <50% - no time for correction Background Info: →AFD = ΔI →inside the doghouse = acceptable; outside the doghouse = unacceptable "Half power, half an hour"

Answer 231

→annunciates if SR flux doubles in 9 minutes

Answer 232

Note: losing power has the same effect as pulling fuses.

Answer 233

Note: losing power has the same effect as pulling fuses.

Answer 234

→2 ranges: Low range (0.1 cps to 10^5 cps) and Wide range (10^-8 to 200% power) →fission chamber detector →designed to operate under accident conditions; PAM equipment →indicates on MCB and RSP

Systems Exam 3 Comprehensive Deck for Review Flashcards

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