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Operator Knowledge > E-0 Series EOP's > Flashcards

E-0 Series EOP's Flashcards

1
Q

What conditions should be established prior to restarting a RCP?

A
  • RCP Bus energized
  • RCP cooling (CCW and Seal Injection)
  • Thermal Barrier Cooling high D/P alarms clear
  • # 1 Seal D/P >200
  • # 1 Seal Leakoff greater than RCS dependent value.
  • Bearing lift pump running for 2 minutes.
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2
Q

What conditions can rule out steam void formation in the Rx Vessel Upper Head?

A

With RVLIS <100%, all of the following is met:
- RCS# < 1725#
- Core has remained covered
- Accumulators have NOT injected

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3
Q

Why is it preferred to postpone RCP restart until after a void in the upper head is vented?

A
  • PZR level may lower off-scale low and lead to loss of pressure control and letdown isolation.
  • Could transfer non-condensable gases to transfer to other places in the RCS and impede heat transfer.
  • Non-condensable gases in other parts of the RCS could cause erratic/erroneous indications.
  • Non-condensable gases transferred to the PZR could make pressure control harder. (Hard Bubble formation)
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4
Q

Define Natural Circulation

A

Flow within the RCS caused by temperature induced density gradients and differences in elevation between the heat source and the heat sink.

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5
Q

What are the physical conditions required to support Natural Circulation? (SUP-011)

A
  • There must be a heat source and heat sink.
  • Heat sink must be at a higher elevation than the heat source.
  • A flow path exists between the heat source and sink.
  • Density gradients caused by temperature differences between the two must exist.
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6
Q

What parameters confirm formation of Natural Circulation? (SUP-011)

A
  • Subcooling >40F
  • S/G #’s stable or lowering
  • RCS hot leg temps stable or lowering
  • CETC temps stable or lowering
  • RCS cold leg temps at saturation temp for the S/G’s
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7
Q

What are the SI Termination Criteria?

A
  • Subcooling >40F
  • Secondary Heat Sink verified (NR level >13% in at least one S/G OR total feed flow >240k pph)
  • RCS # stable or rising
  • PZR level >16%
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8
Q

What is the name of procedure E-0?

A

Rx Trip or SI

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9
Q

What is the name of procedure ES-0.0?

A

Rediagnosis

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10
Q

What is the name of procedure ES-0.1?

A

Rx Trip Response

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11
Q

What is the name of procedure ES-0.2?

A

Natural Circulation Cooldown

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12
Q

What is the name of procedure ES-0.3?

A

Natural Circulation Cooldown with Steam Void in Vessel

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13
Q

What is the name of procedure ECA-0.0?

A

Loss of ALL A/C Power

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14
Q

What is the name of procedure ECA-0.1?

A

Loss of All A/C Power Recovery Without SI Required

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15
Q

What is the name of procedure ECA-0.2?

A

Loss of All A/C Power with SI Required

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16
Q

What are the Major Actions for E-0?

A
  • Verify auto actions initiated by the safeguards system
  • Identify the appropriate EOP network procedure for recovery. (E-2, E-3, then E-1)
  • Shut down unnecessary equipment and continue to identify appropriate recovery procedure.
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17
Q

What are the Major Actions for ES-0.1? (Rx Trip Response)

A
  • Ensure primary system stabilizes at no-load conditions.
  • Ensure secondary system stabilizes at no-load conditions.
  • Ensure necessary components have power.
  • Maintain/Establish forced flow.
  • Maintain stable plant conditions.
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18
Q

What are the Major Actions for ES-0.2? (Natural Circulation Cooldown)

A
  • Permit cooldown and depressurization of the RCS at the fastest rate possible WITHOUT forming voids in the vessel head.
19
Q

What are the Major Actions for ES-0.3? (Natural Circulation Cooldown w/ Steam Void in Vessel)

A
  • Permit cooldown and depressurization of the RCS at the fastest rate possible while allowing formation of voids in the vessel head.
20
Q

What are the FOP criteria for E-0? (Rx Trip or SI)

A
  • RCP Trip: If either condition occurs, trip all RCP’s
    • CIS phase B
      -OR-
    • RCS # <1300# AND a CCP or SI pump running
  • AFW Switchover: If CST level lowers to <15%, then switch to alternate supply.
  • Cold Leg Recirc: If RWST level lowers to < 30%, then go to ES-1.3 (Transfer to Cold Leg Recirc)
  • Faulted S/G Isolation: Isolate AFW flow to a SINGLE affected S/G if:
    • Single S/G # lowers uncontrollably or is completely depressurized.
      -AND-
    • Secondary heat sink is established
  • RCP Bus Trip Criteria: if either condition occurs, open affected RCP bus RAT supply:
    • Annunciator 119(219) or 120(220) drop 69
      -AND-
    • Any associated bus phase voltage < 110 volts
21
Q

What is the basis for controlling AFW flow to between 240K lbm to 450K lbm?

A
  • Lower end is enough flow to ensure adequate heat sink available to remove decay heat.
  • Higher end is low enough flow to reduce excessive cooldown.
22
Q

What things are checked for a FWI?

A
  • Both MFP’s tripped
  • MFP discharge valves closed
  • FRV’s closed
  • Feed Isolation Valves closed
23
Q

Why does E-0 (Rx Trip or SI) only allow isolating feed flow to ONE faulted S/G?

A

Isolating more than one S/G may not meet minimum flow requirements for heat sink and would subsequently create a RED path on Heat Sink.

24
Q

What criteria will require transition to FR-S.1 (Response to Nuclear Power Generation/ATWS) from E-0?

A

Rx Trip criteria not met, and RNO criteria not met after manually tripping the Rx.

25
Q

What criteria will require transition to ECA-0.0 (Loss of All A/C Power) from E-0?

A

Both T11(21)A and T11(21)D buses NOT energized.

26
Q

What criteria will require transition to ES-0.1 (Rx Trip Response) from E-0?

A

Completion of immediate actions AND SI not required.

27
Q

What criteria will require transition to E-2 (Faulted S/G Isolation) from E-0?

A
  • S/G pressure lowering in an uncontrolled manner
    -OR-
  • S/G completely depressurized
28
Q

What criteria will require transition to E-3 (SGTR) from E-0?

A

Any of the following:
- S/G NR level rising in an uncontrolled manner
- SJAE radiation monitors not normal
- GS radiation monitors not normal
- S/G Blowdown sampling or treatment radiation monitors not normal
- S/G PORV radiation monitors not normal

29
Q

What criteria will require transition to E-1 (Loss of Rx or Secondary Coolant) from E-0?

A

Any of the following:
- Containment radiation not normal
- Containment # >1#
- Containment water levels not normal

30
Q

What are the FOP criteria for ES-0.1? (Rx Trip Response)

A
  • SI Actuation: If either of the following occur, actuate SI and go to E-0
    • RCS subcooling < 40F
    • PZR level cannot be maintained > 7%
  • AFW switchover: If CST <15%, switch to alternate supply.
  • E-0 Transition: If SI actuation occurs, go to E-0.
  • RCP Bus Open Phase: If either condition occurs, open affected RCP Bus RAT supply breaker.
    • Annunciator 119(219) or 120(220) drop 69
      -And-
    • Associated bus voltage <110 volts
31
Q

While performing ES-0.1, what is the RCS borated to if any rod is NOT < 10 steps?

A
  • Unit 1 = 160ppm (2650 gal) for EACH rod not inserted.
  • Unit 2 = 150 ppm (2500 gal) for EACH rod not inserted.
32
Q

What criteria will require transition to ES-0.2 (Natural Circulation Cooldown) from ES-0.1?

A

Completion of ES-0.1 and when reaching the last step with NO RCP’s running.

33
Q

What are the FOP criteria for ES-0.2? (Natural Circulation Cooldown)

A
  • SI Actuation: If either of the following occur, actuate SI and go to E-0.
    • Subcooling <40F
    • PZR level cannot be maintained >7%
  • AFW Switchover: If CST level <15%, switch to alternate supply.
  • ES-0.3 Transition: After performing step 13, if natural circulation cooldown and depressurization must be performed at a rate that could form a void, then go to ES-0.3.
  • E-0 Transition: If SI actuation occurs, go to E-0.
  • RCP restart: If conditions can be established for starting an RCP, return to step 1.
34
Q

What is the significance of verifying all CRDM fans running while performing ES-0.2? (Natural Circulation Cooldown)

A

CRDM cooling fans aid significantly in removing heat from the Rx Vessel head, therefore aids in maintaining saturated conditions.

35
Q

While performing ES-0.2 (Natural Circulation Cooldown) what is the cooldown rate limit?

A

< 25F/hr

36
Q

While performing ES-0.2 (Natural Circulation Cooldown) at what pressure are accumulators isolated?

A

RCS # < 1000#

37
Q

What conditions are required to place RHR cooling in service?

A
  • RCS Hot Leg Temp < 350F
  • RCS # < 425#
38
Q

What are the FOP criteria for ES-0.3? (Natural Circulation Cooldown with Steam Void in Vessel)

A
  • SI Actuation: If either condition occurs, actuate SI and go to E-0
    • Subcooling < 40F
    • PZR level cannot be maintained >7%
  • AFW Switchover: If CST level < 15%, switch to alternate supply
  • E-0 Transition: If SI actuates, go to E-0.
  • RCP restart: If conditions can be established for starting an RCP, return to step 2.
39
Q

What conditions are required to proceed with ES-0.3?

A

The first 13 steps of ES-0.2 (Natural Circulation Cooldown) are complete.

40
Q

While performing ES-0.3 (Natural Circulation Cooldown with Steam Void in Vessel) what must PZR level be prior to cooldown/depressurization and why?

A
  • PZR liquid must be saturated AND PZR level must be between 34%-44%.
  • PZR level must be low enough to accommodate void growth and high enough to cover the PZR heaters and prevent letdown from isolating.
41
Q

While performing ES-0.3 (Natural Circulation Cooldown with Steam Void in Vessel) what is the cooldown rate limit?

A

< 100F in any 60 minute period.

42
Q

While performing ES-0.3 (Natural Circulation Cooldown with Steam Void in Vessel) why must RVLIS upper plenum level be maintained >70%

A

Allows void growth to reach the hot legs WITHOUT disrupting natural circulation. (Entraining steam that would travel to the S/G U-tubes)

43
Q

What are the criteria to enter ES-0.0? (Rediagnosis)

A
  • E-0 has been completed
  • Operators are currently in an EOP series procedure
  • SI is required OR is in service
  • Operator judgement

Operator Knowledge (17 decks)

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