E-0 Series EOP's Flashcards by Dustin Norton

What conditions should be established prior to restarting a RCP?

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

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

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

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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Define Natural Circulation

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

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

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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What are the SI Termination Criteria?

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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What is the name of procedure E-0?

Rx Trip or SI

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What is the name of procedure ES-0.0?

Rediagnosis

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What is the name of procedure ES-0.1?

Rx Trip Response

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What is the name of procedure ES-0.2?

Natural Circulation Cooldown

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What is the name of procedure ES-0.3?

Natural Circulation Cooldown with Steam Void in Vessel

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What is the name of procedure ECA-0.0?

Loss of ALL A/C Power

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What is the name of procedure ECA-0.1?

Loss of All A/C Power Recovery Without SI Required

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What is the name of procedure ECA-0.2?

Loss of All A/C Power with SI Required

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What are the Major Actions for E-0?

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

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

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

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

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

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

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

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

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.

What things are checked for a FWI?

Both MFP’s tripped
MFP discharge valves closed
FRV’s closed
Feed Isolation Valves closed

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

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.

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

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

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

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

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

Completion of immediate actions AND SI not required.

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

- S/G pressure lowering in an uncontrolled manner -OR- - S/G completely depressurized

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

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

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

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

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

- 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

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

- Unit 1 = 160ppm (2650 gal) for EACH rod not inserted. - Unit 2 = 150 ppm (2500 gal) for EACH rod not inserted.

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

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

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

- 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.

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

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

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

< 25F/hr

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

RCS # < 1000#

What conditions are required to place RHR cooling in service?

- RCS Hot Leg Temp < 350F - RCS # < 425#

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

- 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.

What conditions are required to proceed with ES-0.3?

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

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

- 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.

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

< 100F in any 60 minute period.

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

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

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

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