05000298/LER-1979-011-03, /03L-0 on 790424:reactor Water Cleanup MO-18 Contactor Failed to Close Manually During Cold Shutdown. Caused by Failure of Auxiliary Contact Mechanism.Repairs Completed Per IE Bulletin 78-05

/03L-0 on 790424:reactor Water Cleanup MO-18 Contactor Failed to Close Manually During Cold Shutdown. Caused by Failure of Auxiliary Contact Mechanism.Repairs Completed Per IE Bulletin 78-05

ML19274F045
Person / Time
Site:	Cooper
Issue date:	05/23/1979
From:	Scheer J NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19274F044	List: 05000298/LER-1979-011, Forwards LER 79-011/03L-0 05000298/LER-1979-011-03, /03L-0 on 790424:reactor Water Cleanup MO-18 Contactor Failed to Close Manually During Cold Shutdown. Caused by Failure of Auxiliary Contact Mechanism.Repairs Completed Per IE Bulletin 78-05
References
LER-79-011-03L, LER-79-11-3L, NUDOCS 7906080254
Download: ML19274F045 (1)

LER-1979-011, /03L-0 on 790424:reactor Water Cleanup MO-18 Contactor Failed to Close Manually During Cold Shutdown. Caused by Failure of Auxiliary Contact Mechanism.Repairs Completed Per IE Bulletin 78-05

Event date:
Report date:
2981979011R03 - NRC Website

text

1 FORM 366 U. S. NUCLEAR REGULATORY COMMISSION 7)

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT OFSCRIPTION AND PROBABLE CONSEQUENCES h l o l 21 lRWCU MO-18 contactor GE Model CR105X auxiliary contacts failed during cold shutdown.

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[ Radiological Tech. Specs. 3.7.D.1 requires RWCU M0-18 to be operable during power oper-l o

3 ption and Radiological Tech. Specs. 3.2 require auto closure on a Group III isolation I o

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RWCU MO-15 provided redundant isolation and was operable.

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IE Bulletin No. 78-05 recommends corrective action and this pction was completed with a retrofit to the CR105X contactors at CNS.

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