ML19330C014

Final Deficiency Rept Re Interference Problem Between Pipe Clamps & Mechanical Shock Arrestors Supplied by Bergen- Paterson.Cause Not Stated.Snubbers Will Be Rotated End for End

ML19330C014
Person / Time
Site:	Wolf Creek
Issue date:	08/04/1980
From:	Koester G KANSAS GAS & ELECTRIC CO.
To:
References
KMLNRC-017, KMLNRC-17, NUDOCS 8008070422
Download: ML19330C014 (6)

Text

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KANSAS GAS AND ELECTRIC COMPANY G6ENN L. mOESTE4 cCE **ttac t =f qm Nuclear August 4, 1980 Mr. W.C. Seidle, Chief Reactor Construction and Engineering Support Branch U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive Suite 1000 Arlingt.on, Texas 76011 IC4IRRC-017 Re: NRC Docket No. STN 50-482 Subj: 50.55(e) Report Bergen Patterson Strut Assembly

Dear Mr. Seidle:

On July 3, 1980, Mr. W.G. Eales made a telephone report to Messrs. W.A. Crossman and W.G. Hubacek regarding an interference problem between pipe clamps and shock ar-restors furnished to Wolf Creek by Bergen Patterson.

Attached is a final report submitted pursuant to regulation 10CFR50. 55 (e) regarding this deficiency.

Yours very truly,

',/f,G ' 4 GLK:bb Attach c: Director Instection and Enforcement U.S. Nuclear Regulatory Commission O[

Washington , D.C. 20555 Attach 15 Cys h/ /

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10CFR50. 55 ( e) FIUAL REPORT ON INTERFERENCE PROBLEM BETWEEN PIPE CLAMPS AND MECHANICAL SHOCK ARRESTORS FOR WOLF CREEK GENERATING STATION, UNIT NO 1 JULY 31, 1980

TABLE OF CONTENTS 1.0 Introduction 2.0 Description of the Deficiency 3.0 Identification of Firm Supplying the Clamps and Shock Arrestors 4.0 Safety Implications 5.0 Corrective Action

1.0 INTRODUCTION

On June 20, 1980 Bergen-Patterson (BP) submitted a 10CFR21 report to Mr Boyce H Grier, Director of Region I. In this report BP described an interference problem which exists between pipe clamps and shock arrestors furnished by them to several nuclear projects including Wolf Creek. BP subsequently forwarded the information to Bechtel.

Bechtel forwarded the information on to KG&E and on July 3, 1980 KG&E confirmed to NRC Region IV that 21 clamp / shock arrestor assemblies to be delivered to Wolf Creek were affected.

2.0 DESCRIPTION

OF DEFICIENCY The deficiency is described in BP's report to the NRC dated June 20, 1980. (Also see attached sketch #1) 3.0 IDENTIFICATION OF FIRM SUPPLYIC CLAMPS AND SHOCK ARRESTORS The clamps and shock arrestors were supplied by Bergen-Patterson under Bechtel issued purchase order 10466M-218A.

4.0 SAFETY IMPLICATIONS A detailed analysis of all 21 snubbers would be necessary to quantify pipe movement restrictions and resulting pipe stress. However, it appears that the interferences identified by Bergen-Patterson could inhibit the performance and function of the snubbers which could result in overstressing of the attached pipe.

5.0 CORRECTIVE ACTION Correction of the interference will be made by rotating the snubbers (end for end) . See attached sketch #2. This work is expected to be complete by December 1, 1980.

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. REPAIR CRITERIA /PROCEDUR8  : TO CORRECT B6RGEN PATERSON SNUBBERS

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3. Reinstall the pipe clanry and rear bracket at the opposite and from l Mich it was removed '-

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4. Rotate the pipe clae:pI by hand. Atleast 6' rotation should be. evident.

'2his is necessary due,to the variance of pipe clasp lengths.

pf 5. The itet of corrected;. anubbers is to be maintained n the jobeite.

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