ML20024C394

LER 83-035/03L-0:on 830515,pressurizer Heater Group 1B Failed to Energize in Manual & Declared Inoperable Per Tech Spec 3.4.3.Caused by Blown Fuse in Heater Contactor Control Circuit.Fuse replaced.W/830628 Ltr

ML20024C394
Person / Time
Site:	McGuire
Issue date:	06/28/1983
From:	Nardoci P, Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-83-035-03L, LER-83-35-3L, NUDOCS 8307120583
Download: ML20024C394 (2)

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EVENT DESCRIPTION AND PROS A8LE CONSEQUENCES h I o i: l lWhile in Mode 1. pressurizer heater group IB_ failed to enereize in manual and !

i o i 3 ' Iwas declared inonernble nor T.S,3.4.1. Thin is 1eportable per T.S.6.9.1.11(b) i c i 4 l land similar to R0-369/83-02. Durine the rimo rhnt ernun 1R (which rocnivne occ-Joisllential power) was inoperable, at least two groups of pressurizer heaters were i loteIloperable (althoueh only one received essentini nower). Hon 1th nna snforv nf l I

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h

!110lIThis incident resnited from n hinun fuen in the heater contactor conern1 cir- l l i j i l lcuit, the cause of which is unknown. The fuse was replaced and the heater i l1!2ileroup declared operable on May 16. 1983. Nn hnne a nm zo,n was found durine this I l i l 3 l l incident. An evninnrinn of rhn fnan nnn14cneinn uf11 kn nerformed to verifv l t i i 4 l [that the installed fuses are of the proper rating. -

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IVWUF .FER GOMPANY HALH. TUCKER TELEPHONE

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June 28, 1983 Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street NW, Suite 2900 Atlanta, Georgia 30303 Re: McGuire Nuclear Station Unit 1 Docket No. 50-369

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/83-35. This report concerns T.S. 3.4.3, "The pressurizer shall be operable with...at least two groups of pressurizer heaters each having a capacity of at least 150 kw."

This incident was considered to be of no significance with respect to the health and safety of the public.

Very truly yours, fE. &N/dr/

Hal B. Tucker PBN:j fw Attachment cc: Document Control Desk Records Center U. S.-Nuclear Regulatory Commission Institute of Nuclear Power Operations Washington, D. C. 20555 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 Mr. W. T. Orders NRC Resident Inspector McGuire Nuclear Station

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