05000272/LER-1981-020, Forwards LER 81-020/03L-0.Detailed Event Analysis Encl

Forwards LER 81-020/03L-0.Detailed Event Analysis Encl

ML18086A650
Person / Time
Site:	Salem
Issue date:	03/25/1981
From:	Uderitz R Public Service Enterprise Group
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18086A651	List: 05000272/LER-1981-020, Forwards LER 81-020/03L-0.Detailed Event Analysis Encl 05000272/LER-1981-020-03, /03L-0:on 810224,snubber on Top of RHR Pump 11 Was Found to Be Defective.Probably Caused by Intermittent Seizing of Balls in Race Due to Internal Corrosion.Snubber Replaced
References
NUDOCS 8106090565
Download: ML18086A650 (2)

LER-1981-020, Forwards LER 81-020/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2721981020R00 - NRC Website

text

Public Service Electric and Gas Company 80 Park Plaza Newark, N.J. 07101 Phone 201/430-7000 March 25, 1981 Mr. Boyce H. Grier Director of USNRC Office 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 81-20/03L 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 81-20/03L.

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

Sincerely yours, 4/ -. / ~;/::: -:-. ~~'

/(.,,-l,i_:.--'. ~~:/*

R. A. Uder1t£"

General Manager -

Nuclear Production CC:

Director, Office of Inspection and Enforcement (30 copies)

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

Report Number:

Report Date:

Occurrence Date:

Facility:

e 81-20/03L March 25, 1981 2/24/81 Salem Generating Station - Unit 1 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF.OCCURRENCE:

Failed Snubber on No. 11 RHR Pump CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 -

Rx Power 100% - Unit Load 1130 :MW DESCRIPTION OF OCCURRENCE:

During normal operations at 1925 hours0.0223 days <br />0.535 hours <br />0.00318 weeks <br />7.324625e-4 months <br /> on February 24, 1981, the No. 11 RHR Pump was declared inoperable in order to perform Engineering Test DCR No. 1ET1153 IAW NRC Bulletin 81-01, "Surveil-lance of Mechanical Snubbers".

Action Statement 3.5.2 was entered at this time.

The snubber mounted on the top of the pump motor was found to be defective.

This occurrence constituted operation in a degraded mode IAW Technical Specification 6.9.1.9.b.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The apparent cause of the snubber failure appears to be the result of internal corrosion that caused intermittent seizing of the balls in the race.

ANALYSIS OF OCCURRENCE:

Technical Specification 3.5.2 requires that with one ECCS subsystem inoperable, restore the inoperable subsystem to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in hot shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

CORRECTIVE ACTION

The defective snubber was replaced in kind with one that was tested satisfactory.

the Action Statement was terminated at 2015 hours0.0233 days <br />0.56 hours <br />0.00333 weeks <br />7.667075e-4 months <br /> on February 25, 1981.

FAILURE DATA:

International Nuclear Safeguards Corporation Mechanical Shock and Vibration Arrestor Model MSVA-2 T.T.-4 A.T. -

+ 1-1/2 Prepared By W. J. Steele er -

Salem Generating Station SORC Meeting No.

81-19

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