ML20024E746
| ML20024E746 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/04/1983 |
| From: | Lempges T NIAGARA MOHAWK POWER CORP. |
| To: | Martin T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-SSINS-6820 IEB-78-09, IEB-78-9, NMP-695L, NUDOCS 8309070014 | |
| Download: ML20024E746 (1) | |
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q NMP-6952 NINE MILE P0lNT NUCLEAR STATION /P.O. BOX 32 LYCOMING. NEW YORK 13093 / TELEPHONE (315) 343-2110 Aug. '4, 1983 kh. Thomas T. Martin, Director Division of Engineering and Technicat P.tograms U.S. Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, PA 19406 RE: Docket No. 50-220 Revised Response to 1.E. Buttetin 78-09
Dear ilt. Martin,
A review of 1.E. Buttetin 78-09, our July 28, 1978 response and the adequacy of.the procedures and conttols used at Nine flite Point Unit #1 to assure that drycell head re-instattation achieves a degree of teak tightness equivalent.to.that attained during instattation immediately ptecceding the last successful ClLRT, has demonstrated a need for pto-cedural revisions.
Af ter thitteen years of operation, no ptoblems have been experienced in re-instattation af.the containment head or any other bolted closures; howevet, no parameters have been established to attow a comparison between successive installations. Reconsideration was given to the methods ptesented in the Bulletin 78-09, but att were rejec.ted for application at this facaLity.
Maintenance Procedure N1-MP-1.8 has been revised, and now utilizes a Siach tensioner model #1 X 39000 pressurized to 6500 psig to apply.the final bolt load to each stud. Calculations were performed which establish that at this tension, adequate bolt loading is achieved which will ptevent Lifting of.the heads during a design basis LOCA, and an adequate margin exista.to ptevent bolt oversttess.
Therefore, we are currently in compliance with the intent of Bulletin 78-09.
Sincerely,
& & b.
yfL Thomas E. Lemp es l! ice President Nuclear Generation TEL/MB/jm s30907oo14 830004 PDR ADOCK 05000220 PDR
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