05000249/LER-1980-048-03, 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

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: 05000249/LER-1980-048, Forwards Updated LER 80-048/03X-1 05000249/LER-1980-048-03, 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
References
LER-80-048-03X, LER-80-48-3X, NUDOCS 8107240224
Download: ML20009D620 (2)

LER-1980-048, 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

Event date:
Report date:
2491980048R03 - NRC Website

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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 l

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60 41 coCKET NUMSE.1 68 69 EVENT oATE 74 75 REPORT oATE 80 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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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.

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D-12 3 - 80 102 PART I l TITLE OF EVE:1T OCCURRED12/23/80 2000 Failure of MO 3-1001-1B Shutdown Isolation Valve DATE TIME !

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