ML19343D620

LER 81-030/03L-0:on 810401,rod Sequence Control Sys Did Not Allow Normal Control Rod Movement.Caused by Failed Reed Switches in Control Rod Position Probes.Probes Replaced

ML19343D620
Person / Time
Site:	FitzPatrick
Issue date:	05/01/1981
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19343D619	List: ML19343D618 ML19343D620
References
LER-81-030-03L, LER-81-30-3L, NUDOCS 8105050581
Download: ML19343D620 (1)

Text

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NRC FO7M 364 - U S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

CONTROL 8 LOCK. l 1

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68 69 EVENT 0 ATE 74 REPORT OATE 7 8 61 COCKET NUMBER EVENT DESCRIPTICN AND PROSABLE CONSEQUENCtS h Io12IlDuring routine shutdown operation, the Rod Secuence Control System (RSCS) would -l ,

Io t al lnot allow r.ormal control rod movement during a portion of the shutdown. RSCS 1 1 o 141 l was reoui red to be operable by TS 3.3.B.3. Since itSCS would nne alinw nnr=al I

' a manual ceram I 4 10151 I control rod Insert) 7n. the shutdown .<as comoleted bv initlarina I

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25 se CAUSE DESCRIPTION AND CCRRECTIVE ACTICNS h

, ii 6 o I [roubleshooting of RSCS did not reveal any failure resultino in the conclusion l l1 t i j t that failed reed switches in control rod position probes would not allow RSCS I

,,,2i lto recognize the existing control rod positions. Replacement of several orobes I l,i3j land subsequent test of RSCS resulted in satisfactory ooeration. I f

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