ML20010F765

LER 81-129/03L-0:on 810804,during Maint on Channel B Reactor Coolant Wide Range Instrumentation,Both RHR Trains Declared Inoperable When Inlet Isolation Valve Was Closed.Caused by Shut Signal Transmitted to Operator.Procedure Modified

ML20010F765
Person / Time
Site:	McGuire
Issue date:	09/01/1981
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010F763	List: ML20010F762 ML20010F765
References
LER-81-129-03L, LER-81-129-3L, NUDOCS 8109110303
Download: ML20010F765 (1)

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89 GS COcaET '*4.,mean EvemT OATE i. *S stPCAT OATE 40 EVENT E3calmCN ANO P*CSA4LE 00h3ECUENets h I s i:1 Mhile in Mode 5, during maintenance on the Channel "B" reactor coolant wide ,

,,,3, irange pressure instrumentation., both trains of the Residual Heat Removal (ND) I

,,, , System were declared inoperable when an inlet isolation valve was inadvertently I

, .3 , 3 ; , closed. This is prohibited during Mode 5 operation by T.S. 3.4.1.4 which is 1 reportable pursuant to T.S. 6.9.1.13(b) and is similar to previous ROf/369/81-72.

,,,,,9 The loss of ND in this incident was momentary, and had no effect on the health

,2,,, ,and safety of the public.  ;

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j, ,ajlAs a result of Channel B pressure instrumentation maintenance action, a " shut" :

lI bonrrol sional was beino transmitted to the valve operator controller which reJ

,,,.,tsulted in the valve being closed when its power supply breaker was closed. The ,

,,,, , wide range pressure calibration procedure is being modified (and other proced ,

, , , . , tures checked) to ensure that required maintenance will have no adverse effects,

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• I l,Z_,j@l N/A l r . . to NaC USE tNLY I:13i ,ba @$ssemirnca l N/Ah , tj,,,,,,,,,,l assusespaspaasn Phillip B. Nardoci ,,,c,,, (704) 373-7432 8109110303 810901 PDR ADOCK 05000369 PDR S _ __ ___ . , _ __