ML19305B360

LER 80-010/01T-0:on 800220,during IE Bulletin 79-14 Insp, Pipe hangers,NP-2-R8A & NP-2-R8B Found Improperly Installed. Cleanup Sys Restraint Mod & Nonrigid Restraint Added

ML19305B360
Person / Time
Site:	Oyster Creek
Issue date:	03/06/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19305B340	List: ML19305B339 ML19305B360
References
IEB-79-14, LER-80-010-01T, LER-80-10-1T, NUDOCS 8003190579
Download: ML19305B360 (3)

Text

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i o 121 i On February 20, 1980, during the inspection required by IE Bulletin 79- [

rs 1,n i 14, three pipe hangers, NP-2-R8A, NP-2-R8B and NP-2-R9 were discovered -  ;

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improperly installed. The hangers restrain a vertical section of the  ;

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,iji, i ence. The hangers in the liquid poison system were corrected to provide th.e proper restraint. The restraint in the cleanup system will be modi-fied to meet the original design criteria. A non-rigid restraint will be added to the return line to give the pipe a two directional restraint.

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Weekly News Release 3-13-80 1

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.....,~ . .... Donald A. Ross _,

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Jersey Central Power & Light Company h *

[_ (f ()j Madison Avenue at Punch Bowl Road Momstown, New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/80-10/lT Report Date March 7, 1980 Occurrence Date January 20, 1980 Identification of Occurrence During verification of as-built conditions for pipe hangers, it was observed that three pipe hangers in the Liquid Poison System were not properly installed.

This event is considered to be a reportable occurrence as defined in the Techni-cal Specifications, paragraph 6.9.2.a.(9~).

Conditions prior to Occurrence The plant was shutdown for a refueling / maintenance outage.

The reactor was subcritical.

The reactor mode switch was locked in refuel.

The reactor cavity was flooded and less than 212*F.

Description of Occurrence On Wednesday, February 20, 1980, at approximately 3:50 p.m., during the inspec-tion required for IE Bulletin 79-14, three pipe hangers were discovered impro-perly installed. The pipe hangers that restrain a vertical section of the liquid poison system piping are numbered NP-2-R8A, NP-2-R88, and NP-2-R9. These hanger numbers are referenced on Bergen-Patterson Drawings.

Also a restraint, ND-1-R2 on the return line of the cleanup system was of the incorrect design. The system requires restraint of the pipe in two directions and ND-1-R2 was only capable of one directional restraint.

The pipe hangers are used to restrain a pipe from excessive movement during a seismic event. The three hangers all provide horizontal restraint on the verti-cal pipe. The hanger which consists of a pipe clamp with two lugs welded on the l

Jersey central Power & Light Company is a Member cf the General Public Utsties System

Reportable Occurrence No. 50-219/80-10/lT Page 2 March 7, 1980 outside of the clamp, 90* from the pipe clamp end, should rest in a square box made of angle iron. The four equidistant extarnal points should rest on the center of the flats of the box. The box is rigidly supported to the drywell wall. Therefore, if properly installed, the pipe would be allowed minimal hori-zontal movement. The hangers were found with the pipe clamp located above the restraining box which would permit excessive movement of the pipe in a seismic event.

Apparent Cause of Occurrence Impreper installation and incorrect design were the cause of this occurrence.

Analysis of Occurrence The Liquid Poison System is a standby, redundant, independent control system for use in the unlikely event that the control rod system is inoperable. The Liquid Poison System is. actuated only by remote manual action from the Control Room and will be used only during extreme energency conditions.

The cleanup system is a filtration and ionization exchange system for maintaining the purity of the water in the reactor vessel and recirculation lines. The re-straint in the return line was only capable of restraint in one direction, there-fore, the pipe restraint would be considered. inoperable in a seismic ever.t-The hangers may not have performed their intended function during a seismic event.

Corrective Action The hangers .in the Liquid Poison System were properly reset in the boxes.

The restraint in the cleanup system has been reviewed and will be modified to meet the original design criteria. A non-rigid restraint, a snubber, will be added to the return line to give the pipe a two directional restraint.

Failure Data Not Applicable.

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