ML20204J920

Rev 1 to Emergency Operating Procedure FR-S.2, Response to Loss of Core Shutdown

ML20204J920
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Site:	Millstone, Haddam Neck, 05000000
Issue date:	06/03/1988
From:	CONNECTICUT YANKEE ATOMIC POWER CO.
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References
FR-S.2, NUDOCS 8810250283
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Text

JUN 3 1988

1. $.S.2 REV.15 SUE /DA'E F

ESPONSE TO LOSS OF CORE SHUTDOWN Rev. 1 i

A.

PURPOSE

' Itis procedure provides actions to restore the core to an adequate shutdown condition.

B.

SYMPTOMS OR ENTRY CONDITIONS This procedure is entered from F4).1, SUBCRITICALLY Critical Safety Function Status Tree, on either YELLOWcondition.

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i JUN 3 1988 i

NUMBER 1 112 REV. ISSUE /DATE FR.S.2 RESPONSE TO LOSS OF CORE SHUTDOWN Rev.1 STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 1

CHECK INTERMEDIATE RANGE FLUX INDICATION:

a. Check flux -

a. E flux decreasing, LESS THAN 5 x 10-14 AMPS THEN continue to monitor flux.

WHEN flux less than 5 x 1010 AMPS, THEN do steps I b, e and d.

E flux HQIdecreasing, DIEN check intermediate range channels for undercompensation.

( compensating voltage light (s) lit ).

E undercompensated, DIEN manually energize source range detectors.

E HQIundercompensated.

ItiEN borate the RCS until shutdown margin meets requirerrents of technical specifications section 3.10.

b. Verify source range detectors -

b. Manually energize source range ENERGIZED detector (s).

c. Transfer nuclear flux recorder to source range scale

d. Transfer SUR meters to source range 2

CHECK SOURCE RANGE STARTUP BORATE THE RCS UNTIL SHUTDOWN RATEZERO DE NEGATIVE MARGIN MEETS REQUIREMENTS OF TECHNICAL SPECIFICATIONS SECrlON 3.10.

NOTE:

BORATION SHOUlD CONTINUE TO OBTAIN ADEQUATE SHUTDOWN MARGIN DURING SUBSEQUENT ACTIONS.

3 REBJRNIQ PROCEDURE AND STEP IN EFFECT END Page 2 of 2