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Public 2022 > 40EP-9EO03 Loss of Coolant Accident (LOCA) > Flashcards

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

1
Q

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

A
  • LOCA has occurred (after SPTA’s)

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

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2
Q

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

A
  • 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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3
Q

What conditions cause Harsh Containment?

A
  • 170°F

- 10▲8 mr/hr

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4
Q

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

A
  • 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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5
Q

How does a LBLOCA differ from a small break LOCA

A
  • Press drops <200 psia and LPSI injects

- Heat removal via core boil-off and SI flow

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6
Q

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

A
  • <2X10-4% ↔ or ↓

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

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7
Q

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

A
  • At least 1 PB
  • At Least 1 same train as PB
    • PKA, PKC, PNA
    • PKB, PKD, PNB
  • Bus Plus
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8
Q

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

A

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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9
Q

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

A

Condition 1:
- W/in P/T limits

Condition 2:
- SI Flow Adequate

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10
Q

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

A
  • <44°F [60] superheat and not ↑
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11
Q

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

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

- Tc ↔ or ↓

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12
Q

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

A

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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13
Q

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

A

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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14
Q

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

Why?

A
  • Realign to RWT or SFP
  • SFP for large leaks or CSAS
  • maintains Seal Inj.
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15
Q

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

A
  • Press remains below SIAS - 1/loop

- Subcooling < 24°F [44] stop ALL

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16
Q

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

A
  • 5 Minutes TCA
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17
Q

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

A
  • 10 minute TCA
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18
Q

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

A
  • 30 Minutes TCA
19
Q

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

A
  • 16.67 minutes TCA
20
Q

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

A
  • 30 minute TCA

- takes 30 minutes to get accurate readings

21
Q

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

A
  • Both pumps on mini-flow

- not expected to exceed 8.5 psig in 1 hour

22
Q

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

A
  • At least 1 header flow >4350 gpm
  • Ensure ALL RCP’s are off
  • Isolate RCP Seal BO
  • Align H2 Recombiners
23
Q

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

A
  • Pcntmt <50 psig and not ↑

- SI actuated and sufficient flow

24
Q

What is the concern with low CNTMT pressure during RAS?

A
  • Low press could cause SI air binding due to entrained air from RAS sump
25
Q

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?

A
  • Running CS pump trips

- Press cannot be maintained <55 psig

26
Q

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

A
  • Water level in containment
27
Q

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

A
  • 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
28
Q

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

A
  • CW flow to Main Condenser is lost
  • Prevents over pressurizing condenser
  • Isolates SGBD
29
Q

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

A
  • 2 Hours
30
Q

What is HPSI pump Throttle Criteria?

A
  • ≥24°F [44] RCS subcooling
  • > 10% [15] Lpzr ↔ or ↑
  • 1 SG available 45-60% (being fed)
  • RVUH ≥ 16%
31
Q

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

A
  • 100°F/hr
  • Stop C/D
  • Stabilize press/temp
  • Continue C/D when within 100°F/hr
32
Q

What are indications of RCS Voiding?

A
  • LD flow > CH flow
  • Lpzr ↑ significantly more than expected with spary operating
  • RVLMS < 100%
  • HJTC unheated indicates saturated conditions
33
Q

What conditions indicate Natural Circulation?

A
  • Loop ▲T <65°F
  • Tc and Th ↔ or ↓
  • ≥ 24 [44]°F subcooled via CET
  • < 30°F ▲T B/W Th and max quadrant CET
34
Q

What action is required if you cannot verify Natural Circulation?

A
  • Ensure proper Feed flow/ Steam flow
35
Q

How long does it take to develop Natural Circulation?

A
  • 5-15 minutes

- Longer if tripped from lower power

36
Q

What action will assist with reflux boiling?

A
  • Maintain SGWL
37
Q

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

A
  • 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
38
Q

What RWT levels would require securing CH pumps?

A

50, -4, 44

  • 50% stop 1
  • 46% stop 2
  • 44% stop all 3
39
Q

When does a RAS occur and What action is required?

A
  • 9.4% RWT level
  • Manually close RWT MOV’s
  • 5 minute TCA
40
Q

What are the minimum HPSI flowrates WHEN on sump recirc?

A

1 HPSI
- ≥ 250 gpm

2 HPSI
- ≥ 500 gpm

41
Q

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?

A
  • Notify EC

- Go to FRP

42
Q

What are the requirements for Hot Leg Injection?

A

2-3 hours after start of accident

Any of the following:

  • <24°F [44] REP CET subcooling
  • Lpzr < 10% [15]
  • RVUH <16%
43
Q

What is SDC entry criteria

A
  • 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
44
Q

What are the requirements for aligning CS for SDC?

A
  • Ppzr < 210 psia

- RCS temp < 185°F

Public 2022 (46 decks)

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