40EP-9EO03 Loss of Coolant Accident (LOCA) Flashcards by William Shockley

What are the entry requirements for 40EP-9EO03 Loss of Coolant Accident (LOCA)

LOCA has occurred (after SPTA’s)

- Direct entry Mode 3/4 LTOP not in-service

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What is the Exit Criteria for 40EP-9EO03 Loss of Coolant Accident (LOCA)

LOCA not confirmed
SFSC’s not met
LOCA EOP complete
- SFSC’s met
- SDC entry met/ break iso/ RCS in long term core cooling

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What conditions cause Harsh Containment?

170°F

- 10▲8 mr/hr

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For 40EP-9EO03 Loss of Coolant Accident (LOCA) what are the mitigating actions for an Unisolable leak?

Rapid C/D with SGs (small leaks which require SGs for DHR)
Long Term Core Cooling (simultaneous hot/cold leg inj.)
SDC

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How does a LBLOCA differ from a small break LOCA

Press drops <200 psia and LPSI injects

- Heat removal via core boil-off and SI flow

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For 40EP-9EO03 Loss of Coolant Accident (LOCA), what is the Rx Control SFSC

<2X10-4% ↔ or ↓

- All FSCEA inserted OR >40 gpm boration OR SDM verified

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For 40EP-9EO03 Loss of Coolant Accident (LOCA), what is the Maintenance of Vital Auxiliaries SFSC

At least 1 PB
At Least 1 same train as PB
- PKA, PKC, PNA
- PKB, PKD, PNB
Bus Plus

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For 40EP-9EO03 Loss of Coolant Accident (LOCA), what is the RCS Inventory SFSC

Condition 1:

Lpzr >10% [15%]
≥24°F [44] RCS subcooling
RVUH ≥ 16%

Condition 2:

SI flow adequate
CET & RCS Subcooling <44°F and not ↑

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For 40EP-9EO03 Loss of Coolant Accident (LOCA), what is the RCS Press Control SFSC

Condition 1:
- W/in P/T limits

Condition 2:
- SI Flow Adequate

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For 40EP-9EO03 Loss of Coolant Accident (LOCA), what is the Core Heat Removal SFSC

<44°F [60] superheat and not ↑

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For 40EP-9EO03 Loss of Coolant Accident (LOCA), what is the RCS Heat Removal SFSC

1 SG 45-60% NR feeding to 45-60% NR

- Tc ↔ or ↓

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For 40EP-9EO03 Loss of Coolant Accident (LOCA), what is the Containment Isolation SFSC

Condition 1:

< 3 psig
No CNTMT or secondary rad alarms or rise

Condition 2:

CIAS Actuated
No secondary rad alarm or rise

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For 40EP-9EO03 Loss of Coolant Accident (LOCA), what is the CTMT Temp/Press Control SFSC

Condition 1:

<235°F (sat vapor temp for CSAS setpoint)
<8.5 psig
H2 < 1.1% (above min detectable)

Condition 2:

1 CS hdr > 4350 gpm
<55 psig
H2 <4.9%

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During 40EP-9EO03 Loss of Coolant Accident (LOCA), What must be done with the CH L/U if a SIAS has actuated?

Why?

Realign to RWT or SFP
SFP for large leaks or CSAS
maintains Seal Inj.

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During 40EP-9EO03 Loss of Coolant Accident (LOCA), when would you be required to stop RCP’s?

Press remains below SIAS - 1/loop

- Subcooling < 24°F [44] stop ALL

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How long do you have to Stop RCP’s if below NPSH?

5 Minutes TCA

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How long do you have to Isolate a letdown leak outside of CNTMT?

10 minute TCA

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How long do you have to isolate a SI leak in one of the pump rooms?

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30 Minutes TCA

How long do you have to isolate a RCP HPSC leak?

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16.67 minutes TCA

During 40EP-9EO03 Loss of Coolant Accident (LOCA), how long do you have to place the H2 anal-izer in service?

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30 minute TCA

- takes 30 minutes to get accurate readings

During 40EP-9EO03 Loss of Coolant Accident (LOCA), when would you stop BOTH CS pumps?

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Both pumps on mini-flow

- not expected to exceed 8.5 psig in 1 hour

During 40EP-9EO03 Loss of Coolant Accident (LOCA), what actions are required if CSAS has actuated?

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At least 1 header flow >4350 gpm
Ensure ALL RCP’s are off
Isolate RCP Seal BO
Align H2 Recombiners

During 40EP-9EO03 Loss of Coolant Accident (LOCA), what is the criteria to stop ONE CS pump?

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Pcntmt <50 psig and not ↑

- SI actuated and sufficient flow

What is the concern with low CNTMT pressure during RAS?

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Low press could cause SI air binding due to entrained air from RAS sump

If one CS pump was stopped during 40EP-9EO03 Loss of Coolant Accident (LOCA) when would you be required to restart the second CS pump?

- Running CS pump trips | - Press cannot be maintained <55 psig

What would prevent you from restoring CNTMT cooling following a SIAS actuation?

- Water level in containment

Following a CSAS what are the required conditions to stop CS pumps?

- Stop 1 pump at a time - Pcntmt <5 psig - Not needed for iodine removal - CTMT cooling restored OR SDC aligned OR not needed for H2 mixing

During 40EP-9EO03 Loss of Coolant Accident (LOCA), what condition would require a manual MSIS?

- CW flow to Main Condenser is lost - Prevents over pressurizing condenser - Isolates SGBD

How long do you have to Vent a SIT in a class battery charger is lost?

- 2 Hours

What is HPSI pump Throttle Criteria?

- ≥24°F [44] RCS subcooling - >10% [15] Lpzr ↔ or ↑ - 1 SG available 45-60% (being fed) - RVUH ≥ 16%

What is RCS CDR limit and what actions are required if exceeded

- 100°F/hr - Stop C/D - Stabilize press/temp - Continue C/D when within 100°F/hr

What are indications of RCS Voiding?

- LD flow > CH flow - Lpzr ↑ significantly more than expected with spary operating - RVLMS < 100% - HJTC unheated indicates saturated conditions

What conditions indicate Natural Circulation?

- Loop ▲T <65°F - Tc and Th ↔ or ↓ - ≥ 24 [44]°F subcooled via CET - < 30°F ▲T B/W Th and max quadrant CET

What action is required if you cannot verify Natural Circulation?

- Ensure proper Feed flow/ Steam flow

How long does it take to develop Natural Circulation?

- 5-15 minutes | - Longer if tripped from lower power

What action will assist with reflux boiling?

- Maintain SGWL

During 40EP-9EO03 Loss of Coolant Accident (LOCA), what are the concerns when restarting RCP's?

- RCP start criteria met - Lpzr changes due to void collapse/ SG heat addition - Wait 20 Minutes to ensure natural circ - Reflux boiling causes slug of unborated water

What RWT levels would require securing CH pumps?

50, -4, 44 - 50% stop 1 - 46% stop 2 - 44% stop all 3

When does a RAS occur and What action is required?

- 9.4% RWT level - Manually close RWT MOV's - 5 minute TCA

What are the minimum HPSI flowrates WHEN on sump recirc?

1 HPSI - ≥ 250 gpm 2 HPSI - ≥ 500 gpm

During 40EP-9EO03 Loss of Coolant Accident (LOCA), if 2 CS pumps are stopped due to a loss of suction on HPSI, what actions are required?

- Notify EC | - Go to FRP

What are the requirements for Hot Leg Injection?

2-3 hours after start of accident Any of the following: - <24°F [44] REP CET subcooling - Lpzr < 10% [15] - RVUH <16%

What is SDC entry criteria

- All SFSC's met - Ppzr < 385 psia - Th < 335°F - Lpzr > 30% [38] and controlled - ≥ 24°F [44] RCS subcooling - Activity will not cause unacceptable levels outside of CNTMT

What are the requirements for aligning CS for SDC?

- Ppzr < 210 psia | - RCS temp < 185°F

40EP-9EO03 Loss of Coolant Accident (LOCA) Flashcards

(44 cards)