ML17285B369

Advises That Arguments on Adequacy of Thrust Restraint for Fire Main 12 Inch FP(43)-1 Acceptable.Calculations Provided in Not Reviewed in Reaching Conclusion

ML17285B369
Person / Time
Site:	Columbia
Issue date:	06/26/1990
From:	Samworth R Office of Nuclear Reactor Regulation
To:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
References
TAC-64670, NUDOCS 9007120365
Download: ML17285B369 (8)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 June 26, 1990 Docket No. 50-397 Mr. G.

C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System P.O.

Box 968 3000 George Washington Way

Richland, Washington 99352

SUBJECT:

UNDERGROUND FIRE MAIN 12" FP(43)-1 (TAC NO. 64670)

By letter dated May 12, 1989 I advised that NRC completed our review of your submittals related to underground fire mains at WNP-2 and that we found your analyses and evaluations acceptable with the exception of the need for adequate thrust restraint on the line identified as 12" FP(43)-l.

At that time we had reservations about the principle of using an analysis in lieu of the specific code requirement.

Furthermore, because of the novelty of your installation, we had reservations about the acceptability of your analytical'ethodology.

We found no clear basis for your approach.

By letter dated September 11, 1989 (G02-89-158) you provided additional infor-mation on both the acceptability of analysis and on your methodology.

That submittal included a copy of a letter dated August 8, 1989 to D.H. Walker of the Washington Public Power Supply System, providing the personal opinion of Mr. Robert E.

Solomon, P.E., Senior Fire Protection

Engineer, who is the National Fire Protection Association (NFPA) liaison to the Committee on Private Water Supply Piping.

In his letter, Mr. Solomon identified the Ductile Iron Pipe Research Association (DIPRA) Thrust Rest'raint Manual as an acceptable authority on the use of thrust restraints.

While I was at the WNP-2 site during the week of May 7, 1990 the plant staff provided additional insight into'the analytical approach and made available for my examination a copy of the DIPRA manual "Thrust Restraint Design for Ductile Iron Pipe, Second Edition, 1989."

Also, in your September ll, 1989 letter, you committed the Supply System to install an indicating check valve that will enable you to quantify flow and allow you to identify major leakage in the underground system.

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C. Sorensen June 26, 1990 Based on the opinion of Hr. Solomon, our understanding that you believe that your analysis is consistent with the guidance provided in the DIPRA manual, and your commitment to install an indicating check valve to monitor leakage in the underground

system, we accept your arguments on the adequacy of the thrust restraint for fire main 12" FP(43)-1.

In r eaching this conclusion we did not review the calculations which you provided with your September 11, 1989 letter.

Sincerely, cc w/enclosures:

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Mr. G.

C. Sorensen WPPSS Nuclear Project No.

2 (WNP-2)

CC:

Mr. C.

M. Powers WNP-2 Plant Manager Washington Public Power Supply System P.O.

Box 968, MD 927M Richland, Washington 99352 Mr. G. E. Doupe, Esquire Washington Public Power Supply System P. 0.

Box 968 3000 George Washington Way Richland, Washington 99532 Mr. Curtis Eschels, Chairman Energy Facility Site Evaluation Council Mail Stop PY-11 Olympia, Washington 98504 Mr. Alan G. Hosier, Licensing Manager Washington Public Power Supply System P. 0.

Box 968, MD 956B Richland, Washington 99352 Mr. A. Lee Oxsen Assistant Managing Director for Operations Washington Public Power Supply System P. 0.

Box 968, MD 1023 Richland, Washington 99352 Mr. Gary D. Bouchey, Director Licensing and Assurance Washington Public Power Supply System P. 0.

Box 968, MD 280 Richland, Washington 99352 Regional Administrator, Region V

U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Chairman Benton County Board of Commissioners

Prosser, Washington 99350 Mr. Christian Bosted U. S. Nuclear Regulatory Commission

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Box 69 Richland, Washington 99352 Nicholas S. Reynolds, Esq.

Bishop, Cook, Purcell 5 Reynolds 1400 L Str eet NW Washington, D.C.

20005-3502

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C. Sorensen June 26, 1990 Based on the opinion of Mr. Solomon, out understanding that you believe that your analysis is consistent with the guidance provided in the DIPRA manual, and your commitment to install an indicating check valve to monitor leakage in the underground

system, we accept your arguments on the adequacy of the thrust restraint for fire main 12" FP(43)-1.

In reaching this conclusion we did not review the calculations which you provided with your September 11, 1989 letter.

Sincerely, cc w/enclosures:

See next page

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