ML19347C826

AO 73-21:on 730908,during Plant shutdown,21 Hydraulic Shock & Sway Arrestors in Piping Sys in Drywell Found Failed. Caused by Loss of Hydraulic Fluid.Failed Snubbers Replaced W/Snubbers Rebuilt w/Bergen-Paterson Seal Kits

ML19347C826
Person / Time
Site:	Oyster Creek
Issue date:	09/10/1973
From:	Rone A JERSEY CENTRAL POWER & LIGHT CO.
To:
References
AO-73-21, NUDOCS 8103040989
Download: ML19347C826 (2)

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Date: 9/10/73 Time: 3:00 a.m.

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/ ABNORMAL OCCURRENCE REPORT NO. 73-21

SUBJECT:

Failure of 21 Ilydraulic Shock and Sway Arrestors on piping systems in the Drywell, including units on both Core Spray and both Isolation Condenser loops.

This event is considered to be an abnormal occurrence as defined in the Technical Specifications, paragraph 1.15.D. Notification of this event as required by the Technical Specifications, para-

. grap:16.6.2.a, was made to AEC Region I, Directorate of Regulatory Operations, by telephone on Monday, September 10, 1973, at 12:45 p.m., and personally to Mr. E. Greeman on Monday, September 10, 1973.

SITUATION: The plant was shutdown on September 8,1973 for the purpose of inspecting the flydraulic Shock and Sway Arrestors located on

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piping systems throughout the Drfwell.

CAUSE: The snubbers were made inoperable due to a loss of hydraulic fluid.

REMEDIAL ACTION:

The failed liydraulit Shock and Sway Arrestors were replaced using snubbers ' rebuilt with seal kits supplied by the Bergen Paterson Pipe Support Company. The new' seals are of'a different type, which according to Bergen Paterson, will provide a longer seal life.

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AbnoEnal Occurrence .

September 10, 1973 - -

Report No. 73-21 ,

SAFETY SIGNIFICANCE:

The loss of snubber operability resulted in a reduction in the ability of the plant to safely survive a design bases earthquake.

The failures were such that they affected both Core Spray and e

both Emergency Condenser Systems, e

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