Zach Stubby's Heavy Hitters - Primary Systems Part 2 Flashcards

Question

How long does it take to drain the RWST to 33%?

Answer 1

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 2

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

Answer 3

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 4

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

Answer 5

→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 6

→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 7

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

Answer 8

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 9

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 10

→RVLIS - heated thermocouples →containment sumps - heated and non-heated RTDs (measure every foot from 808' to 817' and also 817'6"

Answer 11

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

Answer 12

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 13

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 14

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 15

→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 16

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 17

→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 18

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

Answer 19

→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 20

→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 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

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

Answer 25

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

Answer 26

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 27

→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 28

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

Answer 29

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

Answer 30

→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 31

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 32

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

Answer 33

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 34

→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 35

→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 36

→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 37

→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 38

→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 39

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

Answer 40

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 41

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 42

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

Answer 43

→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 44

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

Answer 45

→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 46

→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 47

→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 48

→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 49

→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 50

→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 51

→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 52

→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 53

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

Answer 54

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 55

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 56

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

Answer 57

→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 58

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

Answer 59

→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 60

→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 61

→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 62

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

Answer 63

→channels N31 & N32 →BF3 Proportional Detector →Rx Trip at 10^5 cps (1/2 detectors, 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 64

→channels N35 & N36 →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 (1/2 detectors) →**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 65

→channels N41, N42, N43, & N44 →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 66

→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 67

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 68

2 PR Channels Inoperable, enter LCO 3.0.3

Answer 69

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

Answer 70

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

Answer 71

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

Answer 72

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

Answer 73

→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 74

→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 75

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

Answer 76

→normally open →fail open on loss of air or power →Lo-Lo level in the Chem Add Tank (~6%). →Power supply from opposite train "Air Jordan was number 23, so valves 2 & 3 are AOVs."

Answer 77

→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 78

→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 79

→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 80

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

Answer 81

2 trains required in modes 1 - 4

Answer 82

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

Answer 83

→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 84

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

Answer 85

→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 86

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

Answer 87

...taken to pullout due to runout concerns.

Answer 88

→~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 89

→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 90

→maintain max expected inlet temp ≤102°F →level maintained ≥770', restore within 7 days or shutdown (required level based on 30 days for accident unit and safe shutdown of other unit) →if SSI inoperable for reasons other than level (e.g. temp >102° or dam degraded), be in mode 3 in 6 hrs, mode 5 in 36 hrs Modes 1-4

Answer 91

...will inop both Trains, cross connecting SSW between units will inop both unit's affected trains →between units is desirable to only supply each unit's CCW HX and opposite unit's CCP →accomplished by sending discharge of one pump through the cross connect and →manually throttling the other unit's discharge valve to →limit total flow to 18,600 gpm

Answer 92

→the CCW HX Shell side should be filled, vented, and pressurized prior to operating SSW OR →the CCW HX Shell side shall be isolated and drained with the drain valves open

Answer 93

1. SI 2. BO - train associated 3. Low Pressure opposite train <10 psig off of the 10" header (safety loop) 4. Start of train associated CCW Pump, in auto or manual (SSW pumps powered from uEA1 & uEA2)

Answer 94

→discharge MOV only closes to 10% open position, must be manually closed 8 turns for isolation →if manually closed, must be opened 8 turns from closed (10% open) before cycling electrically Note: if valve has been fully closed manually, there will be no position indication on MCB because power has been removed. Position indication lights will be dark. (MOVs powered from MCCs located adjacent to associated pump, uEB3-3, uEB4-3)

Answer 95

Normally from U2; ABT used (XEB3-3; ABT is preferred power seeking)

Answer 96

→pump will trip on low discharge pressure of 85 psig which causes screens to stop (7 sec TDPU after pump start, bypassed if started in manual) →SI on unit supplying power; traveling screens also stop and screenwash valve fails open on SI →trip of U1 and U2 train related SSW pumps (X-01 Train A, X-02 Train B); prevents auto start of screenwash pump for that train and closes screenwash valves

Answer 97

Auto Starts →Hi differential level across screens: 15.25"; runs until D/L is ≤8.25" (minimum runtime of 25 mins) →Every 4 hours; runs for 16 mins

Answer 98

→average sediment depth shall be ≤1.5 ft; if not, take immediate action to reduce sediment level →dam shall have no abnormal degradation or erosion; if not, immediately enter TS 3.7.9 for SSI inop

Answer 99

10-inch Line: →SIP lube oil coolers →CCP lube oil coolers →CSP bearing lube oil coolers →EDG jacket water coolers 30-inch Line: →CCW HX Can be AFW backup during loss of CST

Answer 100

Two trains and an SSW Pump on the opposite unit with its associated cross-connects shall be operable (Modes 1-4).

Answer 101

→u-HV-4395/4396 →tapped off 10" safety header downstream of EDG jacket water cooler to provide some preheating if EDG is operating →powered from uEB3-1 (4395) and uEB4-1 (4396)

Answer 102

→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 103

→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 104

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 105

→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 106

→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 107

→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 108

→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 109

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 110

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 111

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

Answer 112

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 113

→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 114

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

Answer 115

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

Zach Stubby's Heavy Hitters - Primary Systems Part 2 Flashcards

(143 cards)