05000311/LER-1982-118, Forwards LER 82-118/03L-0.Detailed Event Analysis Encl

Forwards LER 82-118/03L-0.Detailed Event Analysis Encl

ML20066A596
Person / Time
Site:	Salem
Issue date:	10/20/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20066A597	List: 05000311/LER-1982-118, Forwards LER 82-118/03L-0.Detailed Event Analysis Encl
References
NUDOCS 8211060136
Download: ML20066A596 (3)

LER-2082-118, Forwards LER 82-118/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3112082118R00 - NRC Website

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PSEG i ublic Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station October 20, 1982 Mr. R. C. Haynes Regional Administrator USNRC Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Haynes:

LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 82-ll8/03L Pursuant to the requirements of Salem Generating Station Unit Nc. 2, Technical Specifications, Section 6.9.1.9.b, I we are submitting Licensee Event Report for Reportable Occurrence 82-ll8/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours, i

H. J. Midura General Manager -

Salem Operations l

RF:ks','J4jp CC: Distribution 1

8211060136 821020 PDR ADOCK 05000311 S PDR The Energy People f6W 05 2189 (20W t1 C1 e

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Report Number: .82-ll8/03L Report Date: 10-20-82 Occurrence Date: '09-29-82 Facility: -Salem Generating Station, Unit 2 Public Service Electric &, Gas Company-

. Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Engineered Safety Feature Actuation System - No. 2C Vital Bus Under Voltage Relay - Improper Setpoint.

This report was initiated by Incident Report 82-316.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 82% - Unit Load 890 MW e.

DESCRIPTION OF OCCURRENCE:

At 1520 hours0.0176 days <br />0.422 hours <br />0.00251 weeks <br />5.7836e-4 months <br />, September 29, 1982, during performance of surveillance testing of the Engineered Safety Feature Actu-ation System (ESFAS), it was discovered that No. 2C Vital Bus undervoltage relay failed to drop out on decreasing voltage. The channel was declared inoperable, placed in the tripped condition, and Limiting Condition for Operation 3.3.2b Action 14 was entered. The redundant undervoltage channels were operable throughout the occurrence.

DESIGNATION-OF APPARENT CAUSE OF OCCURRENCE:

Investigation revealed that the undervoltage relay setpoint l was low. A similar problem had been observed on August 25, 1982, (see LER 82-09 4/03L) . Due to the similarity of the two events,

l. further' investigation-was conducted; it was subsequently dis-

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covered that the relay stop lever was out of adjustment.

l ANALYSIS OF OCCURRENCE:

The operability of the ESFAS ensures that; l) the associated ESF action and/or. reactor' trip will be initiated when the para-

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meter monitored by each channel or combination thereof reaches its setpoint, 2) the specified coincidence logic is maintained, r 3) sufficient redundancy is maintained to permit a channel to be out of service for testing or maintenance, and 4) sufficient system functional capability is available for protective and ESF purposes'from diverse parameters.- The operability of these systems is required to provide the overall reliability, redundancy and diversity assumed available in the facility design for the l protection and mitigation of accident and transient conditions.

The integrated operation of each of these systems is consistent with the assumptions used in the accident analysis.

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,, LER 82-118/03L ANALYSIS OF OCCURRENCE: ,

(continued)

Redundant trip capability is provided by two other independent channels, therefore, this occurrence involved no risk to the health or safety of the general public. Inoperability of one trip channel constitutes operation in a degraded mode permitted by a limiting condition for operation and is reportable in accordance with Technical Specification 6.9.1.9.b.

Action Statement 3.3.2b Action 14 requires:

With the number of operable channels one less than the total number of channels, operation may proceed until performance of the next required channel functional test, provided the inoperable channel is placed in the tripped condition within one hour.

CORRECTIVE ACTION:

As noted, the channel was placed in the tripped condition in compliance with the action statement. The undervoltage relay stop lever was properly adjusted; the trip setpoint was reset, and'the channel was tested satisfactorily. No. 2C Vital Bus undervoltage channel was declared operable, and Limiting Condition for Operation 3.3.2b Action 14 was terminated at 1022 hours0.0118 days <br />0.284 hours <br />0.00169 weeks <br />3.88871e-4 months <br />, September 30, 1982.

Due to the recurrence of similar problems with the relay over the past year, a new relay is on order and will be installed when received.

FAILURE DATA:

General Electric Corporation Undervoltage Relay Model 121AV74A1A Prepared By R. Frahm /[ ' ' ' #

. General' Manager -

Salem Operations SORC Meeting No.82-94B