ML20237H602

Rev 0 to Function Restoration Guidelines FR-C.2, Response to Saturated Core Cooling

ML20237H602
Person / Time
Site:	Sequoyah
Issue date:	08/21/1985
From:	Patterson B, Strickland G TENNESSEE VALLEY AUTHORITY
To:
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References
FR-C.2, NUDOCS 8708170287
Download: ML20237H602 (5)

Text

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TENNESSEE VALLEY AUTHORITY

~SEQUOYAH NUCLEAR PLANT FUNCTION RESTORATION GUIDELINES FR-C.2 RESPONSE Tb SATURATED CORE COOLING

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Revision 0 PREPARED BY:

G. Stric.kland RESPONSIBLE SECTION:

O rations

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REVISED BY:

AfgM SUBMITTED BY:

/

Respfodifible[Secti n' ' Supervisor

.e AUG 2 BB5 PORC REVIEW DATE:

bu@ hrM(h APPROVED BY:

Plant Manager DATE APPROVED:

AUG 211985 Reason for revision (include all Instruction Change Form Nos.):

New Instruction written ~per commitment to NUREG 0737.

The last page of this instruction is number:

3 8708170287 870811 PDR ADOCK 05000327 P

PDR

g SEQUOYAH NUCLEAR PLANT

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PLANT INSTRUCTION REVISION LOG FUNCTION RESTORATION GUIDELINES FR-C.2 REVISION Date Pages REASON FOR REVISION (INCLUDE COMMIT-LEVEL Approved Affected ~MENTS AND ALL ICF FORM NUMBERS)

New instruction written per commitment 0

AtIG 211935 A11 eo NuREo 0737 s

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0261L/mbs I

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SQNP FR-C.2 Unit 1 or 2 Page 1 of 3 Rev. O RESPONSE TO SATURATED CORE COOLING

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A.

PURPOSE This guideline provides actions to restore subcooled core cooling B.

SYMPTOMS Refer to Status Tree C.

TRANSITION FROM OTHER INSTRUCTIONS Status Tree P

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e SQNP FR-C. 2 Unit 1 or 2 Page 2 of 3 Rev. O r

RESPONSE TO SATURATED CORE COOLING STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED CAUTION: If RWST level decreases to less than 29%, then align ECCS suction to the entmt sump using ES-1.2, Transfer.

To RHR Cntmt Sump 1

Verify ECCS Status a.

CCPs - RUNNING b.

3I Pumps - RUNNING c.

RHR Pumps - RUNNING d.

Flow through BIT c.

IF RCS press < 1500 psig, j

THEN verify SI Pump flow f.

IF RCS press < 180 psig, THEN verify RHR Pump flow IF RHR aligned to entmt F

g.

sump, THEN verify RHR alignment per one of the following:

ES-1.2, Transfer To RHR Cntmt Sump Appendix ES-1.3, Transfer To Hot Leg Recire - Appendix i

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SQNP FR-C.2 Unit 1 or 2 Page 3 of 3 Rev. O i

RESPONSE TO SATURATED CORE COOLING

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STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED

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2 Check Source Of RCS Depressurization a.

Pzr PORVs - CLOSED a.

IF RCS press < 2335 psig, 1

THEN close pzr PORV OR block valve b.

Letdown isolated

1) FCV-62-69, 70, 72, 73, and 74 c.

Excess letdown isolated

1) FCV-62-54 or 55 d.

Pzr normal sprays - CLOSED

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e.

Aux spray valve - CLOSED f.

Pzr safety valves - CLOSED f.

Cooldown RCS and depressurize to allow safety valve to reseat g.

Reactor vessel head vent -

CLOSED h.

RCS sample valves - CLOSED

1) FCV-43-2 or 3

2) FCV-43-11 or 12 i

3) FCV-43-22 or 23 i.

Post accident sample valves

- CLOSED

1) FSV-43-250 or 251 1

2) FSV-43-309 or 310 3

Return To Instruction In Effect I

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