ML20247H619

Concludes That Proposed Use of Type 420 Stainless Steel Plug in Regulating Valve Acceptable for One Fuel Cycle (Cycle 2) or Until ASME Code Committee Transmits Written Approval

ML20247H619
Person / Time
Site:	Beaver Valley
Issue date:	05/23/1989
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Sieber J DUQUESNE LIGHT CO.
References
TAC-72923, NUDOCS 8905310276
Download: ML20247H619 (3)

Text

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Docket No. 50-412 j l

Mr. J. D. Sieber, Vice President j Nuclear Group Duquesne Light Company 1

Post Office Box 4 I Shippingport, Pennsylvania 15077

SUBJECT:

BEAVER VALLEY UNIT 2 - USE OF TYPE 420 STAINLESS STEEL IN FEEDWATER REGULATING VALVE PLUG (TAC 72923) i In a letter dated April 14, 1989 you requested NRC approval to us'e'a material ,

in the feedwater regulating valve plug that is not defined for this )

application in Section III of the ASME Code. The material originally used in j these valves was ASME SA-479 Type 304L with a stellite weld overlay surface for the. plug and anti-rotation pins. Excessive wear was found in the original components. Pursuant to 10 CFR 50.55a(a)(3), you propose to use Type 420 stainless steel (SS) material es an alternative to the Code-accepted material for the plug in the feedwater regulating valves. You stated that ever since the Unit I feedwater regulating valves have been fitted with Type 420 stainless steel material, remarkable ir:provement in reliability has been observed. j Article IWD-7000 of ASME Section XI states that replacement materials shall meet the requirements to which the original component or part was constructed. As an alternative, materials ma, meet the requirements of Section III of the ASME Code. Type 420 SS is not currently approved by ASME Section III for this application. However, you have sent the ASME a proposed Code Case and proposed revision to ASME Section III regarding use of this material on /pril 6, 1989. In addition, you requested the valve manufacturer, Copes-Vulcan, to provide additional documentation concerning the acceptability of a Type 420 SS plug. The manufacturer responded that prototype analysis and testing performed under static and dynamic loads ensures that the plug design is acceptable.

Paragraph 10 CFR 50.55a(a)(3)(1) pent.its the staff to authorize proposed alternatives to the requirements of ASME Section XI provided that the licensee demonstrates that the proposed alternatives would provide an acceptable level of quality and safety. We find that the successful use of Type 420 SS in the Unit 1 feedwater regulating valve plugs demonstrates that the proposed alternative is a significant improvement from the current Unit ? design.

Therefore,pursuantto10CFR50.55a(a)(3)(1),weconcludethatyourproposed use of a Type 420 SS plug is acceptable for one fuel (cycle 2), or until the ASME Code Committee transmits written approval, whichever is eerliest. This completes our efforts.

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Mr. J. D. Sieber - 2'-

Mr. Martin Hum was the reviewer. 1 Sincerely.

-1 Sgua by F. LLyle &

John F. Stolz, Director Project Directorate I-4 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation

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Mr. J. Sieber Beaver Valley Power Station Duquesne Light Company Units 1 & 2 cc:

a. Jay E. Silberg, Esquire Bureau of Radiation Protection Shaw, Pittman, Potts and Trowbridge Pennsylvania Department of 2300 N Street, N.W. Environmental Resources Washington, DC 20037 ATTN: R. Janati Post Office Box 2063 Kenny Grada, Manager Harrisburg, Pennsylvania 17120 Nuclear Safety Duq sesne Light Company Mayor of the Borrough of P. Q. Box 4 Shippingport Shippingport, Pennsylvania .15077 Post Office Box 3 Shippingport, Pennsylvania 15077 John A. Lee, Esquire .Ashley.C. Schannauer Duquesne Light Company Assistant City Solicitor One Oxford Centre City of Pittsburgh .

301 Grant Street 313 City-County Building Pittsburgh, Pennsylvania 15279 Pittsburgh, Pennsylvania 15219 W.F. Carmichael, Commissioner Regional Administrator, Region I Department of Labor U.S. Nuclear Regulatory Commission 1800 Washington Street East 475 Allendale Road Charleston, West Virginia 25305 King of Prussia, Pennsylvania 19406 John.D. Borrows Resident Inspector Director, Utilities Department U.S. Nuclear Regulatory Commission Public Utilities Commission Post Office Box 181 180 East Broad Street Shippingport, Pennsylvania 15077 Columbus, Ohio 43266-0573 Director, Pennsylvania Emergency Management Agency Post Office Box 3321 Harrisburg, Pennsylvania 17105-3321 I