ML20052F995

LER 82-005/03L-0:on 820408,lead Lifted in Control Circuitry for Outboard Shutdown Cooling valve,MO-2030,rendering Valve Inoperable.Caused by Misinterpretation of Special Operating Procedure.Lead Reinstalled & Procedures Revised

ML20052F995
Person / Time
Site:	Monticello
Issue date:	05/08/1982
From:	Carpenter G NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052F988	List: ML20052F987 ML20052F995
References
LER-82-005-03L-01, LER-82-5-3L-1, NUDOCS 8205140218
Download: ML20052F995 (1)

Text

r NRC FORM 366 U. S. NUCLEAR MtVLATORY COMMISSION

, & LICENSEE EVENT REPORT WAY 0 5 .982 CONTROL BLOCK: l 1

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7 8 61 DOCK ET NLYSER 69 74 7b EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h l o l 21 l h'hile cooling down after reactor scram, lead in control circuitry for outboard  ;

o ,3 i I shutdown cooling valve, 50-2030, was lifted, after valve was opened. Lifting  ;

[o i4 i l 1ead when valve was open and reactor temperature was above 2120 F disabled i i

Io Isl I primary containment isolation capability for valve, in violation of Technical  ;

Iois1I Specification 3.7.D.1. Redundant isolation valve was operable. No effect on ,

lo l l l public health or safety. No previous similar event. l lo tal L I

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40 42 43 44 4; CAUSE DESCRIPTION AND COPRECTIVE ACTIONS liloll Root cause - special operating procedure written to temporarily solve relaxing l L' I i i I torque switch problem was misinterpreted. Corrective action - when lifted lead I Ii i /1 I was discovered, it was immediately re-installed. Also, special operating nroce-l i l 31 1 dure was revised to be more clear. Modification of motor operator to solve  !

I i I 41 1 relaxing torque switch problem will be installed during next refueling outage. I

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