ML19344A436

LER 80-031/03L-0:on 800716,snubber 75/23 Failed to Lock Up in Tension Direction.Cause Attributed to Component Failure. Snubber Was Replaced with Operable Spare

ML19344A436
Person / Time
Site:	Oyster Creek
Issue date:	08/11/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19344A432	List: ML19344A430 ML19344A436
References
LER-80-031-03L, LER-80-31-3L, NUDOCS 8008200287
Download: ML19344A436 (3)

Text

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d tW 61 COCK ET NUV8ER EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h IoI?I l On July 16, 1980, during the routine functional testine inspection of I l o l 31 l hydraulic snublers installed in safety related systems, snubber 75/23 l

i o l 41 I (Serial Number 469950) failed to lock up in the tension direction. The I i n i s ; l snubber was replaced with an operable spare and subsequently dissassembl- I lo is l l cd. The inspection of the valve block internals revealed a nick on the  !

{ 0 j 71 1 Poppet en the tension side which apparently caused excess bleeding of j Lo t 81 ; the hydraulic fluid and prevented lock up. l

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33 34 35 36 31 40 42 43 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h l i t o l l The cause of this occurrence is attributed to comnonent failure. The l I i l i 1 l snubber was replaced with an operable snare. Selected hydrauli c <nnhh- I g,i7i l ers on Isolation Condenser "B" were tested to verify operability. The l lil3l l poppet was replaced in the defective snubber and new fluid was install- 1 ii i4 i 1 ed. The snubber was retested and performed satisfactorily. I 7 8 9 80 ST S

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uaueneooe.aoco Donald A. Ross ,, ny , . 201-455-8784 y

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Jersey Central Power & Ught Company

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Madison Avenue at Punch BcM Road Mornstown. New Jersey 07960 (201)455-8200 OYST11R CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/S0-31/3L Report Date August 11, 1980 Occurrence Date

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July 16, 1980 Identification of Occurrence A hydraulic snubber (shock and sway arrestor) failed to lock up in tension.

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

Conditions Prior to Occurrence Startup testing following a refueling / maintenance outage was in progress. The major parameters at the time of occurrence were:

Power: Reactor, 288 MWt Generator, O MNe Flow: Feedwater, 1.2 x 106 lb/hr Recirculation, 5.3 x 10" GPM Stack Gas, .7 x 10" pCi/sec Description of Occurrence On July 16, 1980 during the routine functional testing inspection of hydraulic shock and sway arrestors (snubbers) installed on safety related systems, snubber 75/23 (serial number 469950) failed to lock up in the tension direction. The snubber was replaced with an operable spare and subsequently disassembled.

Inspection of the valve block internals revealed a nick on the poppet on the tension side which apparently caused excess bleeding of hydraulic fluid and prevented lock up.

Apparent Cause of Occurrence The cause of the occurrence is attributed to component failure.

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Fewer & L>crt Comcany .s a Memcer cf :ne Gererai Puche Ut.ht.es System

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Reportable Occurrence No. 50-219/80-31/3L Page 2 1 August 11, 1980 1

Analysis of Occurrence l Snubbers are intended to limit piping movement during transient and seismic

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events. The functional testing of a representative sample (10% minimum) of all

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hydraulic snubbers is a surveillance item performed each refueling cycle per technical specification requirements (Paragraph 4.5.Q.4).

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Investigation of surrounding attachments on this piping system (Isolation Con-

denser "B") reveals that due to the proximity of operable snubbers, hangers and guides in the vicinity of the inoperable snubber and the low probability occurrence of a seismic event, that the safety consideration of this incident i is considered to be minimal.

Corrective Action l!

I This snubber was replaced with an operable spare.

Selected hydraulic snubbers on isolation condenser "S" were tested to verify operability.

l After the defective poppet was replaced and new fluid was installed, the snubber was retested and performed satisfactorily.

l Failure Data

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Bergen Patterson Hydraulic Shock and Sway Arrestor

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Type HSSA-10 i 6" Stroke 1 2.5" Bore Defective Poppet Tension side (Part number not available)

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