ML19208D513

LER 79-035/03L-0:on 790430,during 18-month Surveillance testing,23 Snubbers Had lock-up or Bleed Rate Values Outside of Acceptance Criteria.Caused by Air in Cylinder,Wear Ring Problems & Handling Damage.Snubbers Rebuilt

ML19208D513
Person / Time
Site:	Beaver Valley
Issue date:	09/21/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19208D503	List: ML19208D502 ML19208D508 ML19208D511 ML19208D513
References
LER-79-035-03L, LER-79-35-3L, NUDOCS 7909280515
Download: ML19208D513 (1)

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DATE EVENT DESCniPTION AND PROD ABLE CONSEQUENCES h l o 12 l l During performance of 18-month surveillance testing of 221 hydraulic snubbers, l o 3 23 snubbers were determined to have lock-up or bleed rate values outside of the l l acceptance criteria. Sik of these snubbers were on the spent fuci pool cooling l o 4 10 Isl I system and had not been tested or rebuilt during the last surveillance period. l lo Ic i l l o 7 l l 0 8 l l 60 7 8 9 SYSTE M CAUSE CAUSE COMP. VA LV E-CODE CoOE SUSCODE COMPONE NT CODE SUSCODE SUSCODE o 9 l x l x l@ LE_jh j @ l 5 l U l P l 0 l R lT lh [Djh l 3 l h 20 7 8 3 to 11 12 IJ 18 19 SEQUE NTI AL OCCURRENCE REPORT REVISION EVENT YE AR REPOHT NO. CODE TYPE N o.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li l o l ghe snubbers failed for various reasons, including air in the cylinder, wear ring l 1 lij problems, and handling damage while removing the snubbers. All of the failed snubbers l 3 7 l were rebuilt, purged, and tested satisfactorily.

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