ML19331C468

LER 80-026/03L-0:on 800709,during Routine Testing Insp of Hydraulic Snubbers Installed in safety-related Sys,Snubber 75/5 Failed to Lock Up in Compression Direction.Caused by Foreign Matl in Snubber Fluid.Snubber Flushed & Refilled

ML19331C468
Person / Time
Site:	Oyster Creek
Issue date:	08/08/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19331C464	List: ML19331C463 ML19331C468
References
LER-80-026-03L, LER-80-26-3L, NUDOCS 8008180441
Download: ML19331C468 (3)

Text

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(PLEAsE PRINT OR TYPE ALL REQUIRED INFORMATION)

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68 63 EVENT DATE 74 75 REPORT DATE 80 7 8 60 61 DOCK ET NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 121 l On July 9,1980, during the routine functional testing inspection of I g 7 g-] l hydraulic snubbers installed in safety related systems, snubber 75/5 _J io i4 ; l (serial number 487348) fail:.:d to lock up in the compression direction. I l o I s l l The snubber was replaced with an operable spare and subsequently dis- l lo ;s l l assembled. The inspection of the valve block internals revealed some l l O 17 l l foreign material around the poppet seating area which prevented it from I i o is i ; seating properly. I CO E SUSCO E COMPONENT CODE SUBCbCE S E l0l9j il l S l Fto l @ l X l@ l 12Z l @ l S l U l P l 0 l R lT l@ l 19D l@ (_Z_l 9 11 13 18 20 7

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li l o l l.'.he cause of this occurrence is attributed to foreien material in the I

g ii,l snubber fluid. Al though the foreign material was susoected to be oieces i

i,,,ilof "0" ri ng , the actual source of the material was not determined. The I I

g l foreign material was removed and the snubber was flushed and refilled The snubber was retested and performed satisfactorily. l giiAi l wi th new fluid. 80 7 8 9 SCO RY DISCOVERY DESCRIPTION

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l l l DESCRIPTION Weekly News Release I lllllllllllll2 0081 M HDonald A R ss m ,. 2 1- %-8784

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, Jersey Central Power & Light Company kd ( Madison Avenue at Punch Bowl Road Momstown. New Jersey 07960 l

(201)455-8200 l l

l OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 l

L!censee Event Report Reportable Occurrence No. 50-219/80-26/3L Report Date August 8, 1980 Date of Occurrence .

July 9, 1980 identi fication of Occurrence A hydraulic snubber (shock and sway arrestor) failed to lock up in compression.

This event is considered to be a reportable occurrence as defined in the Techni-cal Speci fications , paragraph 6.9.2.b.2.

Conditions Prior to Occurrence The reactor was shutdown for a refueling / maintenance outage.

The reactor was subcri tical . '

The reactor mode switch was locked in refuel .

Description of Occurrence On July 9,1980 during the routine functional testing inspection of hydraulic shock and sway arrestors (snubbers) installed on safety related systems, snubber 75/5 (serial number 487348) failed to lock up in the compression d. rec-tion. The snubber was replaced with an operable spare and subsequently dis-assembled. Inspection of the valve block internals revealed some foreign l

material around the poppet seating area which prevented it from seating pro-

! perly.

Apparent Cause of Occurrence The cause of this occurrence is attributed to foreign material in the snubber fluid.

Arse Ceners Power & Light Company is a Member of the General Publ:c Utilities System

Reportable Occ wrence No. 50-219/80-26/3L Page 2 August 8, 1980 ,

Analysis of Occurrence Snubbers are intended to limit piping movement during transient and seismic events. The fccctional testing of a representative sample (10% minimum) of all hydraulic snobbers is a surveillance item parformed each refueling cycle per technical speci fication requi rements (paragraph 4.5.Q.4.) .

Investigation of surrounding attachments on this piping system (Core Spray South) reveals that due to rigidity provided by adjacent supports and anchors and the low probability occurrence of a seismic event, the safety consideration of this incident is considered to be minimal.

Corrective Action This snubber was replaced with an operable spare.

The foreign mati. ial in the fluid was suspected to be pieces of an "0" ring.

However, the actual source of the material was not determined. The foreign material was removed from the snubber. The snubber was flushed * -d filled with new fluid. The snubber was retested and performed satis factori e, Since this is the first encounter with a problem of this type, i t is considered to be an isolated case.

Failure Data Bergen Patterson Hydraulic Shock and Sway atrestor Type HSSA-10 6" Stroke 2.5" Bore EP Secis

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