ML20084C712

Preliminary AO 50-219/74/47:on 740912,two Bergen-Paterson Hydraulic Shock & Sway Arrestor on South Core Spray Sys Found Inoperable.Caused by Component Failure.Two Snubbers Replaced W/Units Rebuilt W/Ep Seals

ML20084C712
Person / Time
Site:	Oyster Creek
Issue date:	09/16/1974
From:	Carroll J JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20084C654	List: ML20084C651 ML20084C712
References
AO-50-219-74-47, NUDOCS 8304080180
Download: ML20084C712 (3)

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!.. Oyster Creek Nuclear Generating Station i Docket #50-219 Forked River, New Jersey ~ 08731 i

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Subject:

Abnormal Occurrence Report No. 50-219/74/47' I

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) The following is a preliminary report being submitted

[ in compliance with the Technical Specifications, i

, paragraph 6.6.2.

f Preliminary Approval:

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,i b/ o .' f / // 9/16/74 (I.T. Carroll,Jr.[ ~Date .

cc: Mr. A. Giambusso.'

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Initial Telephone Date of Report Date: 9/13/74 ,

Occurrence: 9/12/74 Initial Written Time of -

Report Date: 9/16/74 Occurrence: 2200 OYSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER, NEW JERSEY 03731 Abnormal Occurrence Report No. 50-219/74/47 IDENTIFICATION Inoperability of two Bergen-Paterson !!ydraulic Shock and 0F GCCURRENCE:

Sway Arrestors located on the South Core Spray System.

This event is considered to be an abnormal occurrence as de-fin,cd in the Technical Specifications, paragraph 1.15D.

CONDITIONS PRIOR x Steady State Power Routine Shutdown TO OCCURRENCE: llot Standby Operation Cold Shutdown Load Changes During Refueling Shutdown Routine Power Operation Routine Startup Other (Specify)

Operation Power: Reactor, 1907 MWt Electric, 646 MWe Flow: Recirc., 59.5 X 106 lb/hr Feed., 7.13 X 106 lb/hr Reactor Pressure: 1020 psig Stack Gas: 14,300 pCi/sec DESCRIPTION Two snubbers located in a pipe chase on the southwest corner OF OCCURRENCE:

of the reactor building were located during a pipe tracing project. Since neither of the units had previously been in-spected or counted during previous inspections, their operability

, was questionable. Both units were replaced and subsequently tested. There was no oil in the accumulators on either unit.

The piston rod en enc unit was found to be essentially frozen

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Abnormal Occurrence Page 2 Report No. 50-219/74/47 in position whereas although the second unit was stroked and would " lock up", its motion was not smooth.

Design Procedure APPAREST CAUSE Manufacture Unusual Service Condition OF OCCURRENCE: Inc. Environmental Installation / Component Failure

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_ Operator Other (Specify)

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ANALYSIS OF The safety significance of this occurrence was a partial loss OCCURPINCE:

' of the seismic restraining ability for the affected system.

Ilad.the plant suffered a design basis earthquake, the probability that the system would have suffered structural damage was in-creased.

CORRECTIVE The two snubbers were replaced with units rebuilt with EP ACTION:

seals.

FAILURE DATA: Manufacturer: Bergen Paterson Type: IISSA-10 4

O Prepared by: N ~ 2dMCM hd' -

Date: 9/16/74 1 y y L 1