ML19351D247

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Forwards LER 80-040/03L-0
ML19351D247
Person / Time
Site: Oyster Creek
Issue date: 10/01/1980
From: Finfrock I
JERSEY CENTRAL POWER & LIGHT CO.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19351D248 List:
References
NUDOCS 8010090316
Download: ML19351D247 (3)


Text

1 o

OYSTER CREEK h

NUCLEAR GENERATING STATION l

!g'"",%g',l;%' (609) 693-1951 P.O. BOX 388
  • FORKED RIVER
  • 08731 w a..u.wa son, l

October 1, 1980 Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I United States Nuclear Regulatory Comission 641 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

SUBJECT:

Oyster Creek Nuclear Generating Station Docket No. 50-219 Licensee Event Report Reportable Occurrence No. 50-219/80-40/3L This letter forwards three copies of a Licensee Event Report to report Reportable Occurrence No. 50-219/80-40/3L in compliance with paragraph 6.9.2.b.2 of the Technical Spuifications.

V ry truly yours, a

4)

Ivan R. Finf ock Jr.

Vice Presi t Generation IRF:dh Enclosures cc: Mr. John G. Davis, Acting Director (40 copies)

Office of Inspection and Enforcement United States Nuclear Regulatory Commission Washington, D.C. 20555 Mr. William G. Mcdonald, Director (3 copies)

Office of Management Information and Program Control United States Nuclear Regulatory Comission Washington, D.C. 20555 8010 0 90 3/h S

. _ . . . 1. s_ -

t 0YSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 License Event Report Reportable Occurrence No. 50-219/80-40/3L Report Date September 30, 1980 Occurrence Date September 4, 1980 Identification of Occurrence A Hydraulic Snubber (shock and sway arrestor) failed to lock up in compression and tension during functional testing.

This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.b.2.

Conditions Prior to Occurrence Steady State Power The major parameters at the time of occurrence were:

Power: Reactor 1740 MWt Generator 548 MWe 4

Flow: Recirculation 14.4 x i gpm Feedwater 6.5x10glb/hr Description of Occurrence:

On September 4,1980, during the routine functional testing inspection of hydraulic l shock and sway arrestors (snubbers) installed on safety related systems, snubber 51/6 (serial qumber F93502) located on Core Spray System (north) failed to lock up in either the tension or compression directions. While performing the test ,

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personnel observed hydraulic fluid leaking along the control valve assembly.  ;

Further inspection revealed that the hold down socket head screws were loose, '

thus allowing fluid to pass through the seals.

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Reportable Occurrence Page 2 Report No. 50-219/80-40/3L Apparent Cause of Occurrence Component Failure / Personnel Error The snubber failed to lock up during testing due to loss of hydraulic fluid from the holddown socket head bolts being loose.

Analysis of Occurrence Snubbers are intended to limit piping movement during transient and seismic events. Since this snubber failed its functional test in both the tension and compression directions, it was considered to be inoperable while in service. As a result the snubber would not have performed its design function in the event of a seismic occurrence. The ability of Core Spray System I to perform its intended function during a seismic event may have been affected. There are two Core Spray Systems and Core Spray System II would have performed its intended function during a seismic event.

Corrective Action This snubber was replaced with an operable spare. Selected hydraulic snubbers on the Core Spray System will be tested to verify operability.

The socket head screws were tightened and snubber was refilled with hydraulic fluid. The snubber was retested and performed satisfactorily. The scope of the snubber inspection program in progress will be increased. It was concluded from discussion with the Maintenance engineer that the present snubber rebuild and test procedure contains proper instruction and detail that should prevent a recurrence of this problem. Additionally, QA personnel are notified and observe the rebuild operation. Based on this information no changes were deemed necessary to the present procedure.

Failure Data _

Bergen Patterson Hydraulic Shock and Sway Arrestor (Sarial No. F93502)

Type HSSA-10 6" Stroke, 2.5" Bore 1

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