05000311/LER-1982-110, Forwards LER 82-110/03L-0.Detailed Event Analysis Encl

Forwards LER 82-110/03L-0.Detailed Event Analysis Encl

ML20065S985
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
ML20065S986	List: 05000311/LER-1982-110, Forwards LER 82-110/03L-0.Detailed Event Analysis Encl
References
NUDOCS 8211020126
Download: ML20065S985 (4)

LER-2082-110, Forwards LER 82-110/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3112082110R00 - NRC Website

text

"O PSEG Public 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 82-110/03L Pursuant to the requirements of Salem Generating Station Unit No. 2, Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 82-110/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours,

/I h" H. J. Midura General Manager -

Salem Operations RF:ks Afg CC: Distribution 1

8211020126 821020 4 PDR ADOCK 05000311 S PDR The Energy People g@

% 2189 GOM) 1181

Report Number: 82-110/03L Report Date: 10-20-82 Occurrence Date: 09-26-82 Facility: Salem Generating Station, Unit 2 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE: ,

100' Elevation Containment Air Lock - Inoperable.

This report was initiated by Incident Reports82-306 and 82-307.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 81% - Unit Load 820 MWe.

DESCRIPTION OF OCCURRENCE:

At 0530 hours0.00613 days <br />0.147 hours <br />8.763227e-4 weeks <br />2.01665e-4 months <br />, September 26, 1982, during routine operation of the 100' Elevation Containment Air Lock, an operator observed that there was no indication of seal interspace air pressure. The air lock was declared inoperable and Action

-Statement 3.6.1.3.a was entered. The air lock doors were maintained closed to provide for containment integrity. Later that day, an operator was able to restore air pressure to the seals by manually relocating the air interlock linkage, and the air lock was satisfactorily tested. The 100' Elevation Air Lock was declared operable at 0838 hours0.0097 days <br />0.233 hours <br />0.00139 weeks <br />3.18859e-4 months <br />, September 26, 1982, and Action Statement 3.6.1.3.a was terminated. Adjustment of the linkage.was subsequently checked and found to be correct; it was assumed that the linkage had jammed in an apparently isolated occurrence.

At 0628 hours0.00727 days <br />0.174 hours <br />0.00104 weeks <br />2.38954e-4 months <br />, September 27, 1982, during the performance of surveillance on the 100 ' Elevation Air Lock seals, the leakage i on the exterior door seals was found to be greater than the l test specification. The air lock was declared inoperable and

! Action Statement 3.6.1.3.a was entered for a second time. The l excessive leakage had resulted from the failure of the inner

rubber seal and a new seal was installed. During retesting of the door, however, a failure of the test air supply similar to that of the previous day was observed. Containment integrity was maintained by insuring the inner door was closed throughout the occurrence.

LER 82-110/03L ,

DESIGNATION OF APPARENT'CAUSE OF OCCURRENCE:-

Investigation ~of the problem with the air supply to the 100' Elevation Air Iack revealed-that one of the pivot assemblies for the' air interlock-linkage was loose; the-problem had been overlooked in the inve'stigation following the first occurrence.

The. excessive leakage in the second case apparently involved a parting of the bonded joint in the seal. No previous. failures of either type have been~ observed and the events were assumed to be isolated in nature.

ANALYSIS OF OCCURRENCE:

The containment air lock doors allow fo. personnel access to the Containment Building while providing a redundant boundary as part of overall containment integrity. This barrier prevents the release of. radioactive contamination to the environment in the event of a design basis accident. Since one door was main-tained closed, pr)viding containment integrity, no risk to the health and safety of the public was involved. Therefore, this event constituted operation in a degraded mode permitted by a limiting conditon for operation, and is reportable in_accordance with Technical Specification 6.9.1.9.b.

Action Statement 3.6.1.3.a requires:

With one containment air lock door inoperable, maintain at least the operable air lock door closed and either restore the inoperable . door to operable status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, or lock the operable air lock door closed.

CORRECTIVE ACTION:

As noted, in both instances an operable air lor?- door was main-

, tained closed, in compliance ~with the action statement. In the l first case, as mentioned, the air lock tested satisfactorily, was declared operable and the action statement terminated.- On the second occasion, the inner door _was locked closed within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, in compliance with the action statement. The failed seal was replaced, the loose pivot bracket was tightened, and the linkage was readjusted. The air lock was satisfactorily tested'for a second time. It was declared operable at 1425 hours0.0165 days <br />0.396 hours <br />0.00236 weeks <br />5.422125e-4 months <br />, September 28, 1982, and Action Statement 3.6.1.3.a was terminated.

A number of previous problems with air lock _ operating linkage and door seals have been encountered. Efforts.are presently underway to correct the problems including improved operator training, installation of snubbers on the doors, relocation'of air supply isolation valves and revision of the surveillance test to more accurately simulate desired air lock performance.

F-l LER 82-110/03L . . .

FAILURE DATA:

Chicago Bridge and. Iron Company Personnel Air Lock Door Seal.

Prepared By R. Frahm -/[ MS efh[W t

Generaf Man'ager -

Salem Operations SORC Meeting No.82-94B