ML20237H559

Rev 0 to Function Restoration Guidelines FR-S.2, Response to Loss of Core Shutdown

ML20237H559
Person / Time
Site:	Sequoyah
Issue date:	08/21/1985
From:	Strickland G TENNESSEE VALLEY AUTHORITY
To:
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References
FR-S.2, NUDOCS 8708170267
Download: ML20237H559 (4)

Text

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TENNESSEE VALLEY AUTh0RITY SEQUOYAH NUCLEAR PLANT s

FUNCTION RESTORATION GUIDELINES FR-S.2 RESPONSE TO LOSS OF CORE SHUTDOWN s

i Revision 0

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PREPARED BY:

G.

Strickland RESPONSIBLE SECTION:

perations

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SUBMITTED BY:

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L PORC REVIEW DATE:

APPROVED BY:

3 ecd Aw Plarit Manager DATE APPROVED:

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:

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SEQUOYAH NUCLEAR PLANT s

PLANT INSTRUCTION REVISION' LOG I

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l FUNCTION RESTORATION GUIDELINES FR-S.2 REVISION Date

-Pages

-REASON-FOR REVISION (INCLULE COMMIT-LEVEL ADproved Affected MENTS AND ALL ICF FORM NUMBERS) 0 AtIG 21

-New --instruction written per commitment All to NuREa 0737 9m s

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SQNP FR-S. 2 Unit 1 or 2 Page 1 of 2 Rev. O RESPONSE TO LOSS OF CORE SHUTDOWN A.

PURPOSE This guideline provides actions to restore the core to an adequate shutdown condition.

B.

SYMPTOMS s

1.

Source range deenergized and intermediate range startup rate between 0 and -0.2 dpm 2.

Source range positive startup rate C.

TRANSITION FROM OTHER INSTRUCTIONS Status Tree 4e c e' _ _ _ - _ _ - - _ _ _ -

SQNP FR-S. 2 Unit 1 or 2

+

Page 2 of 2 Rev. 0 o-3 RESPONSE TO_ LOSS _OF CORE SHUTDOWN i

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STEP _ ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1

Check Intermediate d

Range Detectors a.

Flux - DECREASING a.

IF flux NOT decreasing, THET perform channel check to evaluate if detectors are undercompensated IF detectorE, ' determined to be unde 1 compensated, TIIEN manually energize source range, detectors 1F detectors, determined NOT undercompensated,

'4 THEN start boration

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-10 1

b.

WHEN flux < 10 amps j

THEN ensure source range detectors energized c.

Transfer NR-45 to one source and intermediate range 2

Check Source Range Detectors a.

Startup rate -

a.

F startup rate ZERO OR NEGATIVE positive,

THEN start boration and evaluate cause of positive startup rate l

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3 Return To Instruction In Effect U

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