05000298/LER-1979-020-03, /03L-0:on 790809,while Performing Surveillance Procedure on Relief Valve Bellows Monitoring Sys,Pressure Switch MS-PS-71G Failed to Actuate.Caused by Improper Assembly.Switch Was Replaced

/03L-0:on 790809,while Performing Surveillance Procedure on Relief Valve Bellows Monitoring Sys,Pressure Switch MS-PS-71G Failed to Actuate.Caused by Improper Assembly.Switch Was Replaced

ML19208D463
Person / Time
Site:	Cooper
Issue date:	09/05/1979
From:	Phillips D NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19208D459	List: 05000298/LER-1979-020, Forwards LER 79-020/03L-0 05000298/LER-1979-020-03, /03L-0:on 790809,while Performing Surveillance Procedure on Relief Valve Bellows Monitoring Sys,Pressure Switch MS-PS-71G Failed to Actuate.Caused by Improper Assembly.Switch Was Replaced
References
LER-79-020-03L, LER-79-20-3L, NUDOCS 7909280455
Download: ML19208D463 (1)

LER-1979-020, /03L-0:on 790809,while Performing Surveillance Procedure on Relief Valve Bellows Monitoring Sys,Pressure Switch MS-PS-71G Failed to Actuate.Caused by Improper Assembly.Switch Was Replaced

Event date:
Report date:
2981979020R03 - NRC Website

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a NRC FQRM 366 ll U. S. NUCLEAR REGULATORY COMMISSION

"(7-77)

M.jCENSEE EVENT REPORT CONTROL BLOCK:

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8 60 61 DOCK ET NUVSER 68 63 EVENT DATE 74 75 REPORT CATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h o

2 l While performing Surveillance Procedure (S.P. 6.2.2.2.5) on the reifef valve bellnus I

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monitoring system as required by Tech. Spec. 4.6.D.4. pressure switch MS-PS-71G failedl o

4 l to actuate. The pressure switches on all sne other relief valves were operable. Therel o

s wer1 no significant occurrences as a result of the event.

Similar event was UE 75-1. I o

6 l There were nO adverse affects to public health and safety.

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CAUSE

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VALVE CODE CODE SUSCODE COVPONENT CODE SU8 CODE SUSCODE [o_L9_j l Il Flh Wh lB lh l I Nl S I T I R I U lh l_E_,j h (l_l h 7

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ltorily. The removed pressure switch was returned to the manufacturer whose analysis I

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unique occurrence and no further action is recuir_ed.

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