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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i TENNESSEE VALLEY AUTh0RITY SEQUOYAH NUCLEAR PLANT s .

I FUNCTION RESTORATION GUIDELINES -

FR-S.2 RESPONSE TO LOSS OF CORE SHUTDOWN - - -

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Revision 0 .  ;

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PREPARED BY: G. Strickland .

RESPONSIBLE SECTION: perations / .

. REVISED BY: /d

.e C SUBMITTED BY:

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tion Supervisor Responsible L Seg\ Y PORC REVIEW DATE: .PQQ$

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: 2 wasakke

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SEQUOYAH NUCLEAR PLANT s

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PLANT INSTRUCTION REVISION' LOG I

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.e. l FUNCTION RESTORATION GUIDELINES FR-S.2 REVISION Date -Pages -REASON-FOR REVISION (INCLULE COMMIT-LEVEL ADproved Affected MENTS AND ALL ICF FORM NUMBERS)

-New --instruction written per commitment 0 AtIG 21 All to NuREa 0737 9m .. s e we eem...m meee l

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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'

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SQNP

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FR-S . 2 Unit 1 or 2 Page 2 of 2 o-Rev. 0 3 ,

RESPONSE TO_ LOSS _OF CORE SHUTDOWN ,

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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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t WHEN flux < 10 -10 amps 1

b. 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

l l 3 Return To Instruction In Effect U

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