05000272/LER-1979-060, Forwards LER 79-060/03L-0

Forwards LER 79-060/03L-0

ML18079B093
Person / Time
Site:	Salem
Issue date:	10/05/1979
From:	Librizzi F Public Service Enterprise Group
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18079B094	List: 05000272/LER-1979-060, Forwards LER 79-060/03L-0 05000272/LER-1979-060-03, /03L-0:on 790907,several Safeguard Sys Could Not Be Reset Due to 28-volt Dc Control Power Breakers Being Tripped.Caused by 28-volt Dc Breaker Being 1-amp Breaker While Circuit Load Is Approx Two Amps
References
NUDOCS 7910110343
Download: ML18079B093 (3)

LER-1979-060, Forwards LER 79-060/03L-0

Event date:
Report date:
2721979060R00 - NRC Website

text

PS~G PulJl1c Service Eleciric ancl Gas Cornp<--my 80 Park Place NE.:wark. NJ 071CJ1 Pi 1r1: 1'.; ;:rJ i t1JJ 7(J(JrJ Mr. Boyce H. Grier Director of USNRC Off ice of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 79-60/03L October 5, 1979 Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 79-60/03L.

This report is required within thirty (30) days of the occurrence.

Sincerely yours, F.

General Manager -

Electric Production CC:

Director, Office of Inspection and Enforcement (30 copies)

Director, Office of Management Information and Program Control (3 copies)

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Report Number:

79-60/03L Report Date:

10/5/79 Occurrence Date:

9/07/79 Facility:

Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Loss of Safeguards Manual Initiation/Reset Functions CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 5 DESCRIPTION OF OCCURRENCE:

During performance of the 18 month surveillance of manual initiation of safety injection and the radiation monitoring system containment isolation functional test, several safeguards systems could not be manually reset due to the 28 volt DC control power circuit breakers being tripped.

Performance Department investigated the problem and has initiated corrective action.

This incident does not affect the automatic operation of the safeguard systems under any operating or shutdown conditions.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence is a design deficiency in the 28 volt DC control power circuit which supplies console indication and initiation/reset functions for console operations.

The circuit breakers are rated for one amp continuous load; but the circuits fed from these breakers have a total load of approximately 2.5 amps.

Under normal operating conditions, the operating load is less than the trip settings of the breakers; but under certain shutdown con-ditions, more indicating and control circuits are energized and simultaneous energizing of a group of relays, solenoids, etc. can cause a breaker overload condition.

ANALYSIS OF OCCURRENCE:

The safeguards systems which are affected by the tripped circuit breakers are not required to be operational during Mode 5 and no Technical Specifications were violated.

The conditions which cause the overload to occur are not present during normal plant operations.

Functional tests of these systems in required modes have verified operability.

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LER 79-60/03L CORRECTIVE ACTION:

A DCR (PD-0153) has been initiated which will replace the existing 1 amp circuit breakers with breakers of 2 amp continuous load rating.

The DCR has been approved and the replacement breakers will be installed prior to entry into Mode 4.

FAILURE DATA Double Pole Breaker Catalog No. AM2-B3-l-2 Manufacturer:

Heinemann Electric Company Trenton, New Jersey Prepared By A. W. Kapple Manager -

Salem/Generating Station SORC Meeting No.

76-79

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