Systems Exam 3 Temporary Review Deck Flashcards

Question

What equipment will auto start when a CCW pump is started, if their control switches are in AUTO?

Answer 1

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 2

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

Answer 3

→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 4

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

Answer 5

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 6

→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 7

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 8

→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 9

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

Answer 10

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

Answer 11

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

Answer 12

→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 13

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 14

→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 15

→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 16

→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 17

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 18

→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 19

→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 20

→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 21

→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 22

→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 23

→P-11 (1960#) OR →SI Signal

Answer 24

→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 25

→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 26

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

Answer 27

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 28

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

Answer 29

→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 30

→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 31

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

Answer 32

→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 33

→containment sumps - heated RTDs →RVLIS - heated thermocouples

Answer 34

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 35

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 36

→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 37

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

Answer 38

→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 39

→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 40

→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 41

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

Answer 42

2 trains required in modes 1 - 4

Answer 43

→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 44

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

Answer 45

→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 46

→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 47

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

Answer 48

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

Answer 49

...taken to pullout due to runout concerns.

Answer 50

→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 51

→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 52

→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 53

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 54

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 55

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

Answer 56

→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 57

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

Answer 58

→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 59

→ >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 60

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

Answer 61

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

Answer 62

RHRPs, SIPs, and CCPs

Answer 63

→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 64

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

Answer 65

→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 66

→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 67

→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 68

→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 69

→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 70

→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 71

→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 72

→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 73

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

Answer 74

→SI →BO →Associated Recirculation Pump starts

Answer 75

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

Answer 76

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 77

→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 78

→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 79

→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 80

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 81

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 82

→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 83

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

Answer 84

→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 85

→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 86

→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 87

2 PR Channels Inoperable, enter LCO 3.0.3

Answer 88

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

Answer 89

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

Answer 90

deviating by >5% of the average of all detectors

Answer 91

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

Answer 92

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

Answer 93

→source range reactor trip block permissive →Setpoint: >10^-10 amps →Coincidence: 1/2 IR

Answer 94

→Allows manual block of SR Hi Flux trip (2/2 block switches) →Block switches also de-energize SR Hi Volts →When <5x10-11 amps on 2/2 channels then: SR Hi volts re-energized, SR trip and Flux Doubling protection re-instated (aforementioned occurs automatically)

Answer 95

→at power permissive →Setpoint: none →Coincidence: P-10 or P-13 met (2/4 Excore NI >10% or 1/2 Turb Impulse Press >10%)

Answer 96

Following Rx trips re-instated with P-7 met: →PZR Lo Pressure →PZR Hi Level →RCP Undervoltage →RCP Underfrequency →Low Flow in 2 RCS Loops Above trips are blocked when P-7 no longer met.

Answer 97

→3 loop flow permissive →Setpoint: >48% →Coincidence: 2/4 PR channels “8 and 3 look almost alike”

Answer 98

→Allows for Rx trip when low flow condition is sensed on 2/3 channels on 1 RCS loop. →Automatically blocked with 3/4 NIS channels < 48%.

Answer 99

→turbine trip permissive →Setpoint: >50% →Coincidence: 2/4 PR channels

Answer 100

→When met, generates Rx Trip if Turbine Trip occurs →Automatically blocked when <50% on 3/4 PR channels.

Answer 101

→nuclear at power permissive →Setpoint: >10% →Coincidence: 2/4 PR channels

Answer 102

When met it performs the following: →Feeds P-7 →Automatically blocks SR Trip and de-energizes SR Hi Volts →Allows blocking of IR Trip and C-1 →Allows blocking of PR Trip (Low setpoint) →SR Hi Flux at Shutdown annunciator and CNTMT Evacuation alarm defeated When 3/4 PR channels <10% the following are automatically re-instated: →IR Trip →C-1 →PR Trip (Low setpoint) →Removes permissive to P-7

Answer 103

→IR Rod Stop (prevent reaching IR & PR Hi flux trips) →Setpoint: IR amps ≈ 20% PR →Coincidence: 1/2 IR channels

Answer 104

→Stops outward rod motion in auto AND manual. →Can be manually blocked when P-10 is met (2/2 switches) →Automatically unblocked when P-10 no longer met.

Answer 105

→PR Rod Stop (prevent reaching PR hi flux trip) →Setpoint: 103% →Coincidence: 1/4 PR channels

Answer 106

→Stops outward rod motion in auto AND manual. →Can be bypassed at the NIS cabinets.

Answer 107

→OTN16 Rod Stop & Turbine Runback →Setpoint: 3% < OTN16 Rx Trip setpoint (115 ± penalties) →Coincidence: 2/4 N-16 channels

Answer 108

→Stops outward rod motion in auto AND manual. →Generates Turbine runback (runback works as follows, on for 1.5 sec @ 200%/min then off for 28.5 sec, cycle continues until C-3 clears).

Answer 109

→OPN16 Rod Stop & Turbine Runback →Setpoint: 3% < OPN16 Rx Trip setpoint (>109%) →Coincidence: 2/4 N-16 channels

Answer 110

→Stops outward rod motion in auto AND manual. →Generates Turbine runback (runback works as follows, on for 1.5 sec @ 200%/min then off for 28.5 sec, cycle continues until C-4 clears).

Answer 111

→Control Bank D Rod Withdrawal Limit →Setpoint: 223 steps →Coincidence: N/A

Answer 112

→Stops outward rod motion in auto only.

Answer 113

→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 114

→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 115

→annunciates if SR flux doubles in 9 minutes

Answer 116

Source Range Hi Flux Rx Trip →Startup Accident →≥10^5 cps →1/2 Source Range Detectors

Answer 117

Source Range Hi Flux Rx Trip →Can be manually blocked (2/2 switches) when P-6 is met. →Auto blocked when P-10 is met →When P-6 no longer met, trip is automatically reinstated. →Can be manually unblocked when P-10 no longer met

Answer 118

Intermediate Range Hi Flux Rx Trip →Startup Accident →IR current ≈ 25% PR →1/2 IR Detectors

Answer 119

Intermediate Range Hi Flux Rx Trip →Can be blocked manually when P-10 is met. →When P-10 no longer met, trip is automatically reinstated.

Answer 120

Power Range Hi Flux "Low Setpoint" Rx Trip →overpower condition, uncontrolled RCCA bank withdrawal →≥25% →2/4 PR detectors (alarm on 1/4)

Answer 121

Power Range Hi Flux "Low Setpoint" Rx Trip →Can be blocked manually when P-10 is met. →When P-10 no longer met, trip is automatically reinstated.

Answer 122

Power Range Hi Flux "Hi Setpoint" Rx Trip →DNB →109% →2/4 PR Detectors (alarm on 1/4)

Answer 123

Power Range Hi Flux "Hi Setpoint" Rx Trip →Cannot be blocked.

Answer 124

Power Range Hi Positive Trip Rate Rx Trip →rod ejection →+5% w/time constant of 2 seconds →2/4 Channels (alarm on 1/4) "Five-two, peeeeewww!!!"

Answer 125

Power Range Hi Positive Trip Rate Rx Trip →Must be manually reset at NIS cabinets →Setpoint is variable based on rate of power increase (i.e. 2.5 % in 1 second will actuate trip, 5% increase in 2 seconds will actuate trip, 10% increase actuates immediately)

Answer 126

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

Answer 127

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

Answer 128

→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

Answer 129

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

Answer 130

→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 131

→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 132

→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 133

→Modes 1-3 →PAM instruments must be operable

Answer 134

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 135

→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 136

→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 137

→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 138

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 139

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 140

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

Answer 141

→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 142

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

Answer 143

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

Answer 144

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 145

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

Answer 146

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 147

→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 148

→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 149

→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 150

→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 151

→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 152

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

Answer 153

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 154

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 155

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

Answer 156

→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 157

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

Answer 158

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 159

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

Answer 160

→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 161

→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 162

→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 163

→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

Systems Exam 3 Temporary Review Deck Flashcards

(191 cards)