ML20009D620

Updated LER 80-048/03X-1:on 801223,shutdown Cooling Sys Inboard Isolation Valve Did Not Close During Shutdown,While Testing Group 2 & 3 Isolation Circuitry.Caused by Breaker Door Interlock Out of Adjustment.Interlock Adjusted

ML20009D620
Person / Time
Site:	Dresden
Issue date:	06/15/1981
From:	Zirwas K COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009D612	List: ML20009D611 ML20009D620
References
LER-80-048-03X, LER-80-48-3X, NUDOCS 8107240224
Download: ML20009D620 (2)

Text

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NAC FORM 386 - " - - - - - - - - - - -- --

- - - - -- J.e.S. NUCLEAR REGULATORY COMMISSION (7 77) .

LICENSEE EVENT REPORT UPDATE REPORT: Previous Report Date 01/20/81 CONTROL BLOCK: l 1

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lh (Pt. EASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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REPORT oATE EVENT DESCHiPTION ANO PROBABLE CONSEQUENCES h lo !al l During unit shtitdown, while testing Group 2 and 3 isoi-: ton circuitrv, Shutdown Coolingl gl System inboard isolation valve did not close. The valve was closed after resetting l

, g o go; l thermal overloads and adjusting breaker door interlock. The valve was taken out-of- l lo Isl l service in the closed position. The health and safety of the general public was not l l o is l l endangered since primary containment integrity was not required and all other Shutdown l l 0 l 71 1 Cooling System Isolation Valves functioned as designed. This is the first occurrence  ;

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l CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i g o l l The cause of the failure was that the breaker door interlock was out of adjustment. l l g l The door interlock was adj:tsted and the valve tested satisfactorily. No further action l l deemed necessary. l L1_Ql l l 11 141 l l l7 a 9 so N  % PowtR oTHER 3TATUs ois o Y oisCoVERY oEsCRIPTloN l

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, SUPPLEMEllT TO DVR DVR 110. .

STA UtilT, YEAR NO.

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102 PART I l TITLE OF EVE:1T OCCURRED 12/23/80 2000 Failure of MO 3-1001-1B Shutdown Isolation Valve DATE TIME !

REASON FOR SUPPLEMENTAL REPORT Update cause description.

PART 2 l ACCEPTANCE BY STATION REVIEW SL [4-DATE ~il 1( l 21 hYh c$/ - '

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SUPPLEMENTAL REPORT APPROVED J/

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