ML17326A452

Ro:On 791219,during Analysis Described in IE Bulletin 79-14, Nonconformance Identified in Small Piping Sys.Caused by Discrepancy Between Piping Design & as-built Condition.Mod Being Implemented.Followup Rept Will Be Submitted by 800102

ML17326A452
Person / Time
Site:	Cook
Issue date:	12/20/1979
From:	Shaller D INDIANA MICHIGAN POWER CO.
To:
References
IEB-79-14, NUDOCS 8001070351
Download: ML17326A452 (4)

Text

REGULATORY OHMATION DISTRIBUTION SY M (RIOS)

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SUBJECT:

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yet~ INDIANA & NICIIIGAN PD VER CONPA N Y DONALD C. COOK NUCLEAR PLANT P.O. Box 458, Bridgman, Michigan 49106 December 20, 1979 Mr. J.G. Keppler, Regional Director Office of Inspection and Enforcement United States Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 Operating License DPR-74 Docket No. 50-316

Dear Mr. Keppler:

This is to confirm our verbal report to NRC Region III Inspector, Mr. R.E. Masse, at 1620 hours0.0188 days <br />0.45 hours <br />0.00268 weeks <br />6.1641e-4 months <br /> on December 19, 1979.

At that time we reported that as part of the inspection and analysis process mandated by IE Bulletin 79-14, a significant non-conformance was identified in a small piping system of Unit 2 of the Cook Plant.

This significant non-conformance arose because of a discrepancy between the piping design analysis and the "as-built" condition. The piping involved is a 1.0" diameter line, connected between the primary piping and the excess let-down heat exchanger. Reanalysis indicated that the 1.0" diameter pipe would be stressed above the yield limit in the unlikely event that the Design Basis Earthquake occurs. The piping system was reanalyzed with two additional restraints and all the stresses were found to be within the code allowable limit. The modification is being imple-mented in the Unit.

A followup report will be submitted by January 2, 1980, as required by Technical Specification Section 6.9.1.8.

Sincerely, D.V. Shaller Plant Manager

/bab cc: J.E. Dolan G. Olson R.S. Hunter J.M. Hennigan R.W. Jurgensen PNSRC R.F. Kroeger J.F. Stietzel R. Kilburn E.L. Townley R.E. Masse RO:III Dir., IE (40 copies)

R.C. Callen MPSC Dir., MIPC (4 copies) 0,-2,6 )s~e G. Charnoff, Esq.

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