ML20086G616

RO 50-336/83-31:during Seismic Analysis on Svc Water Sys, Discovered Heavy Vs Std Wall Pipe Installed.Hanger Loading Analyses Indicated Five Undersized Hangers.Further Info Will Be Provided in 14-day Rept

ML20086G616
Person / Time
Site:	Millstone
Issue date:	12/23/1983
From:	Herbert R, Mroczka E NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
MP-5634, RO-50-336-83-31, NUDOCS 8401120312
Download: ML20086G616 (1)

Text

l General Offices

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.avo.a . rea soma ce*** HARTFORD. CONNECTICUT 06141-0270 ontwasr evws seacca cewa- (203) 666-6911 sconf1a37.suCLEna E.eFauf Conspast, December 23, 1983 Dr. Thomas E. Murley MP-5634 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

Reference:

Facility Operating License DPR-65 Docket No. 50-336 Reportable Occurrence RO-50-336/83-31

Dear Dr. Murley:

This letter provides notification of Reportable Occurrence 83-31 pursuant to the requirements of Millstone Unit 2 Appendix A Technical Specifications, Section 6.9.1.8.i. This report concerns the discovery, during Service Water system modifications, of conditions not specifically considered in the Safety Analysis Report or Technical Specifications that may require remedial action or corrective measures to prevent the existence or development of an unsafe condition.

While performing a seismic analysis on the Service Water System for the addition of flanges, it was discovered thut heavy versus standard wall pipe was installed. An evaluation of this condition was made and it was determined that all pipe stresses were within satisfactory limits, however, hanger loading analyses showed five hangers to be undersized based on present requirements. Two hangers had undersized snubbers due to the heavier pipe and three hangers had a safety factor of less than 4 but greater than 2.

Further information will be provided, if available, in the 14 day report.

Yours truly, NORTHEAST NUCLEAR ENERGY COMPANY FOR: E. J. Mroczka Station Superintendent Millstone Nuclear Power Station 84011203.' 831223 15000 R. J. Herbert gDRADOCF lY: l Station Services Superintendent Millstone Nuclear Power Station EJM/TP:ejl cc: Director, Office of Management Information and Program Control, Washington D.C. (3)

U.S. Nuclear Regulatory Commission, c/o Document Management /g Branch, Washington, D.C. 20555. , g