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 /

REVISED BY:

SUBMITTED BY: AfgM / .

.e Respfodifible[Secti n' ' Supervisor PORC REVIEW DATE: AUG 2 BB5 APPROVED BY: bu@ hrM(h 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 ,

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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 j c. IF RCS press < 1500 psig, THEN verify SI Pump flow

f. IF RCS press < 180 psig, THEN verify RHR Pump flow

g. IF F RHR aligned to entmt 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 _

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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

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RESPONSE NOT OBTAINED 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

( 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 'l

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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