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Mode Change > 0POP03-ZG-0007 Plant Cooldown > Flashcards

0POP03-ZG-0007 Plant Cooldown Flashcards

1
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

What must RCS water level be maintained greater than in this procedure?

A

36’ 9”

Applicable if fuel is in the core.

  • Note:
  • Reduced inventory is defined as 36’ 3”**
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2
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

How is LCO 3.4.1.4.1 RCS - MODE 5 (Loops Filled) satisfied?

A

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

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3
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

What is required to maintain COMS OPERABLE?

A

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”
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4
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

When lowering pressure to RHR conditions, what must RCP seal D/P maintained greater than?

A

≥ 230 psid

Can help it out by aligning seals to VCT.

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5
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

At what RCS water level are the SGs no longer considered a heat sink?

A

39’ 3”

Also not considered a heat sink if RCS vented to atmosphere.

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6
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

While vacuum is established, what should DAST level be maintained at?

A

60% - 80%

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7
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

What is the differential temperature limit for auxilliary spray?

A

621 ˚F

Must be checked at least once every 12 hrs.

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8
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

When is MODE 4 entered?

A

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.

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9
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

What is the temperature differential limit between the PZR liquid space and the RCS?

A

≤ 320 ˚F

Prevents surge line thermal stratification

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10
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

What must be done within 4 hrs of entering MODE 4 AND prior to going < 325 ˚F?

A
  • *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

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11
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

How many CCPs are allowed in MODE 4?

A

Only 1 CCP may be discharging to RCS

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12
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

How much subcooling is required when RCS pressure is between 1000 psig and 1900 psig?

A

50 ˚F - 100 ˚F

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13
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

What must RCS temperature be to run all four (4) RCPs?

A

≥ 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.

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14
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

What is the maximum pressure the VCT is allowed to reach during RCS fill?

A

65 psig

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15
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

If an RCS boundary opening is planned, what must RCS H2 and VCT H2 be reduced to?

A
  • RCS H2:*
  • *< 4 cc/kg**
  • VCT H2:*
  • *< 4%**
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16
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

During RCS cooldown, what is the maximum ∆T between RCS loops?

A

≤ 25 ˚F

At least 1 RCP is operated during C/D to ensure ∆T limit is not exceeded.

17
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

How often should the upper head subcooled margin be checked during cooldown?

A

Every 30 mins

18
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

If the plant cooldown is due to an unisolable leak, what must be done?

A

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.

19
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

When can the SGs be fed with the main feedwater system?

A

> 340 ˚F

  • SUFW pump is the preferred method
  • AFW can be used as an alternative but must use SG PORVs.
20
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

A PZR vent path must be available prior to drain down. How do we satisfy this requirement?

A
  • *PZR Spray Line Vents Open to atmosphere (RC-0502/0503)**
  • (Preferred)*

OR

1 PZR Safety Removed

21
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

SI should be blocked prior to reaching what RCS temperature?

22
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

What is the admin limit for cooldown?

A
  • RCS:*
  • *80 ˚F/hr**
  • PZR:*
  • *160 ˚F/hr**
23
Q
  • 0POP03-ZG-0007 Plant Cooldown*
    • *

At what RCS temperature must at least 1 RCP be in operation?

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