ML19274F045

LER 79-011/03L-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

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: ML19274F043 ML19274F045
References
LER-79-011-03L, LER-79-11-3L, NUDOCS 7906080254
Download: ML19274F045 (1)

Text

1 FORM 366 U. S. NUCLEAR REGULATORY COMMISSION

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LICENSE NuM8ER 25 26 LICENSE TYPE J0 57 CAT 58 CON'T 7

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5ObRN lL @ 01Sl0l010121918 hl0l4 2l4l7l9 h nlslolgl-l9 h 60 68 69 EVENT DATE 74 75 REPORT DATE 80 61 DOCKET NUMBER EVENT OFSCRIPTION AND PROBABLE CONSEQUENCES h l o l 21 lRWCU MO-18 contactor GE Model CR105X auxiliary contacts failed during cold shutdown. I o 3 [ Radiological Tech. Specs. 3.7.D.1 requires RWCU M0-18 to be operable during power oper-l o 4 ption and Radiological Tech. Specs. 3.2 require auto closure on a Group III isolation I o s ls ignal. RWCU MO-15 provided redundant isolation and was operable. This occur- l 0 6 lrence presented no adverse Consequences from the standpoint of public health and 1 0 7 lSa fe ty. l l

ois l 80 7 8 3 SYSTEM CAUSE CAUSE COMP. VA LV E CODE CODE SUSCOCE COMPONENT CODE SU8 CODE SUSCODE _

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]@ l43Nl@ 44 Gl 0l 8l 0l@ 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o B GE Model CR105X contactor's auxiliary contact mechanism consistino: of a pluncer arm i Ii [i j pnd insulator failed. IE Bulletin No. 78-05 recommends corrective action and this

, 7 pction was completed with a retrofit to the CR105X contactors at CNS. I i I 3 l i 4 I I

7 8 9 80 ST S  % POWER OTHER STATUS 015 O RY OISCOVERY DESCRIPTION i 5 Q@ l 0l 0l Oj@l NA l lDl@l NA l

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402-825-3811 NAME OF PREPARER