05000293/LER-1980-064-03, /03L-0:on 800829,reactor Bldg Airlock Doors Were Momentarily Opened Due to Failure of Electrical Interlock. Caused by Defective Microswitches Which Actuate Door Interlocks.Microswitches Replaced

/03L-0:on 800829,reactor Bldg Airlock Doors Were Momentarily Opened Due to Failure of Electrical Interlock. Caused by Defective Microswitches Which Actuate Door Interlocks.Microswitches Replaced

ML19347B091
Person / Time
Site:	Pilgrim
Issue date:	09/29/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19347B090	List: 05000293/LER-1980-064, Forwards LER 80-064/03L-0 05000293/LER-1980-064-03, /03L-0:on 800829,reactor Bldg Airlock Doors Were Momentarily Opened Due to Failure of Electrical Interlock. Caused by Defective Microswitches Which Actuate Door Interlocks.Microswitches Replaced
References
LER-80-064-03L, LER-80-64-3L, NUDOCS 8010010511
Download: ML19347B091 (1)

LER-1980-064, /03L-0:on 800829,reactor Bldg Airlock Doors Were Momentarily Opened Due to Failure of Electrical Interlock. Caused by Defective Microswitches Which Actuate Door Interlocks.Microswitches Replaced

Event date:
Report date:
2931980064R03 - NRC Website

text

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8 60 61 OOCKET NUMOEM 68 69 EVENT CATE 74 75 REPORT OATE 80 EVENT DESCRIPTION AND PROS A8LE CONSEQUENCES h Iol2l l On August 29, 1980 at approximately 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br />, the Reactor Building Airlock doors l

l o 13 l l were both momentarily opened due to failure of their electrical interlock. A guard l

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airlock doors. The interlock was repaired and returned to service on September 11,19803 i lois1l lo l6 l l l

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33 34 35 36 31 40 el 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o ; l A maintenance request was issued and defective microswitches which actuate the door g Linterlocks replaced. A review of interlocks circuitry has been initiated. Presentiv, !

,,,,,l indication and operation of the electrical interlocks are subjected to common mode i

,,;3, l failure. A design change is being investigated to eliminate this condition.

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