ML19270G820

LER 79-018/03L-0 on 790517:snubber 51/21,core Spray Sys II, Had Signs of Grease on Alemite Fitting on Accumulator.Cause Unknown But Appears Related to Rigorous Svc Conditions. Snubber Replaced

ML19270G820
Person / Time
Site:	Oyster Creek
Issue date:	06/15/1979
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19270G819	List: ML19270G818 ML19270G820
References
LER-79-018-03L, LER-79-18-3L, NUDOCS 7906200400
Download: ML19270G820 (3)

Text

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S*$"c' lL @ l0 15 6J 61 10 10 10 12 Il 19 l@l DOOnET NWBER 6E 69 015 i i I 7 I 7 I o l@l0 I 6 EVENT DATE 74 7b REPORT DATE 80 I1 Ic I7 EVEr.T DESCRfPTION AND PROB AELE CONSEQUENCES h O  : I On May 17, 1979, during the routine visual ins oect 'on nf hvd r;uil i- l 0 3 I shock and swav arrestors (snubbers) installed on safety related systers. I 08: i snehber 51/21. Core Sorav Syste~ II. had sions of arease on the alemite }

o15i i fit t ino on the accumulator. The snubber was replaced with an operable l i

i C 16 !' roarc. When functional 1v rested. the removed snubber failed to lock un I' 8~l i in tha compression direction. The comoression oopoet seatino surface I I

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7 l 3 3 l Spray System 11 will have a lock up test performed on them to verify l 3 , l ope rab i l i ty. Fittings on the snubbers will be capped and tagged. l go 7 8 9 F ACILITY METHOD OF STATUS e

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(201)455 8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/79-18/3 L-0 Report Date June 15, 1979 Occurrence Date Me, 17, 1979

_;_ ificct ion of Occurrence Failure of a hydraulic snubber (shock and sway arrestor) to lock up in com-pression. This event is considered to be a reportable occurrence as defined in the Technical Speci ficat ions, paragraph 6.9.2.b.2.

Conditions Prior to Occurrence The plant was in a cold shutdown condition.

Dt: :rirtion of Occurrence On May 17, 1979, during the routine visual inspection of hydraulic shock and sway arrestors (snubbers) installed on safety related systems, snubber 51/21, Core Spray System il, had signs of grease of the alemite fitting on the accumu-lator. The snubber was replaced with an operable spare and functionally tested, during which it failed to lock up in the compression direction. The snubber was subsequently disassembled and inspected. The compression poppet seating surface and the poppet spring were found to be damaged. This problem was the subject of IE Information Notice No. 79-01.

Apoarent Cause of Occurrence The cause of this event is unknown at this time and is considered to be an isolated case.

Analysis of Occurrence Snubbers are intended to limit piping movement during transient and seismic events. The visual inspection frequency of these units is based upon their past history of failures. Additionally, a mininum of 10% are functionally tested each rear- During the past 17 months, approxir.ately 40 units have been 9,,e L>J)

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Reportable Occurrence No. 50-219/79-18/3L-0 Page 2

, June 15, 1979 functionally tested for lockup in both compression and tension, with no failures.

The re fo re , the safety consideration of this event is considered to be minimal.

Corrective Action This snubber was replaced with an operable spare. Selected hydraulic snubbers on Core Spray Systen 11 will have a lockup test performed on them to verify operability.

Tne results of an analysis performed by Generation Engineering indicated that the pipir.g for Core Spray System 11 experiences rigorous service conditions. As a result of this analysis, various changes to the operational procedures associated w:th the system have beer. made to minimize shock. Since it appears that the cause of the event could be related to the rigorous service conditions experienced, hydraulic snubber 51/21 will be inspected during the next refueling outage.

Additionally, action will be taken to cap and tag the fittings on the snubbers (hydrculic), v ornino personnel not to use grease on them.

Failure Sata Bergen Patterson Hydraulic Shock and Sway Arrestors Type HSSA-10-6 n

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