0POP03-ZG-0007 Plant Cooldown Flashcards
- 0POP03-ZG-0007 Plant Cooldown*
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What must RCS water level be maintained greater than in this procedure?
36’ 9”
Applicable if fuel is in the core.
- Note:
- Reduced inventory is defined as 36’ 3”**
- 0POP03-ZG-0007 Plant Cooldown*
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How is LCO 3.4.1.4.1 RCS - MODE 5 (Loops Filled) satisfied?
1 RCP running for a period of time such that any non-condensable gas is removed from the SG tubes
AND
RCS Pressure > VCT pressure
- 0POP03-ZG-0007 Plant Cooldown*
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What is required to maintain COMS OPERABLE?
SSPS Actuation Cabinets A/B
SSPS Logic Cabinets R/S
PZR PORVs Energized
- *Electrical Distribution Trains A/B OPERABLE**
- At least one powered from safety related P/S*
QDPS APC-B1 / APC-D1 and 7300 cabinets
- MRDS may be in “defeat all”
- SSPS trains can be in “test” or “operate”
- 0POP03-ZG-0007 Plant Cooldown*
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When lowering pressure to RHR conditions, what must RCP seal D/P maintained greater than?
≥ 230 psid
Can help it out by aligning seals to VCT.
- 0POP03-ZG-0007 Plant Cooldown*
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At what RCS water level are the SGs no longer considered a heat sink?
39’ 3”
Also not considered a heat sink if RCS vented to atmosphere.
- 0POP03-ZG-0007 Plant Cooldown*
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While vacuum is established, what should DAST level be maintained at?
60% - 80%
- 0POP03-ZG-0007 Plant Cooldown*
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What is the differential temperature limit for auxilliary spray?
621 ˚F
Must be checked at least once every 12 hrs.
- 0POP03-ZG-0007 Plant Cooldown*
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When is MODE 4 entered?
RCS Tavg < 350 ˚F [2/4]
Prior to entry into Mode 4, the RCS SHALL be borated to the Cold Shutdown (68 ˚F) Xenon Free condition.
- 0POP03-ZG-0007 Plant Cooldown*
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What is the temperature differential limit between the PZR liquid space and the RCS?
≤ 320 ˚F
Prevents surge line thermal stratification
- 0POP03-ZG-0007 Plant Cooldown*
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What must be done within 4 hrs of entering MODE 4 AND prior to going < 325 ˚F?
- *Danger Tag PDP**
- Breaker Open*
- *Danger Tag 1 CCP**
- Racked Out*
- *Danger Tag 1 HHSI**
- Racked Out*
- *Caution Tag 1 HHSI**
- Racked out*
2 Trains of LHSI shall remain OPERABLE in MODE 4
- 0POP03-ZG-0007 Plant Cooldown*
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How many CCPs are allowed in MODE 4?
Only 1 CCP may be discharging to RCS
- 0POP03-ZG-0007 Plant Cooldown*
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How much subcooling is required when RCS pressure is between 1000 psig and 1900 psig?
50 ˚F - 100 ˚F
- 0POP03-ZG-0007 Plant Cooldown*
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What must RCS temperature be to run all four (4) RCPs?
≥ 140 ˚F
This limitation is required to demonstrate acceptable fuel assembly top nozzle hold down spring forces in the Cold Zero Power lift force calculation.
- 0POP03-ZG-0007 Plant Cooldown*
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What is the maximum pressure the VCT is allowed to reach during RCS fill?
65 psig
- 0POP03-ZG-0007 Plant Cooldown*
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If an RCS boundary opening is planned, what must RCS H2 and VCT H2 be reduced to?
- RCS H2:*
- *< 4 cc/kg**
- VCT H2:*
- *< 4%**
- 0POP03-ZG-0007 Plant Cooldown*
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During RCS cooldown, what is the maximum ∆T between RCS loops?
≤ 25 ˚F
At least 1 RCP is operated during C/D to ensure ∆T limit is not exceeded.
- 0POP03-ZG-0007 Plant Cooldown*
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How often should the upper head subcooled margin be checked during cooldown?
Every 30 mins
- 0POP03-ZG-0007 Plant Cooldown*
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If the plant cooldown is due to an unisolable leak, what must be done?
Prompt cooldown and depressurization of RCS must be performed
- 80 ˚F CDR limit does NOT apply
- Limit ∆T between PZR water volume and RCS to ≤ 250 ˚F
Note:
If plant cooldown is NOT due to an unisolable leak, then limit ∆T between PZR water volume and RCS to ≤ 320 ˚F.
- 0POP03-ZG-0007 Plant Cooldown*
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When can the SGs be fed with the main feedwater system?
> 340 ˚F
- SUFW pump is the preferred method
- AFW can be used as an alternative but must use SG PORVs.
- 0POP03-ZG-0007 Plant Cooldown*
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A PZR vent path must be available prior to drain down. How do we satisfy this requirement?
- *PZR Spray Line Vents Open to atmosphere (RC-0502/0503)**
- (Preferred)*
OR
1 PZR Safety Removed
- 0POP03-ZG-0007 Plant Cooldown*
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SI should be blocked prior to reaching what RCS temperature?
540 ˚F
- 0POP03-ZG-0007 Plant Cooldown*
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What is the admin limit for cooldown?
- RCS:*
- *80 ˚F/hr**
- PZR:*
- *160 ˚F/hr**
- 0POP03-ZG-0007 Plant Cooldown*
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At what RCS temperature must at least 1 RCP be in operation?
160 ˚F
