ML20058N790

Forwards Safety Evaluation Supporting Util 890213 Relief Request 89-01 Re ASME Code Section XI Hydrostatic Testing Requirements

ML20058N790
Person / Time
Site:	McGuire
Issue date:	08/09/1990
From:	Matthews D Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
Shared Package
ML20058N793	List: ML20058N790 ML20058N796
References
TAC-72217, NUDOCS 9008150103
Download: ML20058N790 (2)

Text

{{#Wiki_filter:-. /) no,k 4 t UMTED STATES /, NUCLEAR REGULATORY COMMIS$lON n i j wAeMiwoTom, c. c. sones August 9, 1990 1 Docket No. 50-369 Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power Company P. O. Box 1007 l Charlotte, North Carolina 28201-1007 i Dear Mr. Tucker SUlkT. ECT: - RELIEF FROM ASME CODE SECTION XI HYDROSTATIC TESTING, REQUEST NO. 89-01, MCGUIRE NUCLEAR STATION, UNIT 1 (TAC 72217) By letter dated Febrtmry 13, 1989, you requested relief from hyr mstatic testing requirements of ASME Boiler and Pressure 1 Code, Section XI, 1980 Edition through Winter 1980 Adden-r a article IWA-4400 and Article IWD-5000. The. request is ,.sciated with McGuire Unit 1 Nuclear Station Modification MG-12130 Revision 0, which provided for installation of new flanges and expansion joints on the_ suction piping.of Nuclear Service Water Pumps 1A and 1B. This modification was needed because the previous expansion joints, which were welded into place, were exhibiting signs of corrosion. To correct the corrosion problem 1 with the expansion joints and to facilitate future removal and repair, stainless steel flanges and expansion joints were in-stalled. The modification involved weld numbers RN1FW24-1 and RN1FW57-1 and flange connections. i In lieu of the code's hydrostatic testing requirement, you l proposed that all welding be subjected to a magnetic particle examination of the root pass and final weld pass. You also stated that an in-service leak test at system pressure and temperature would be performed on all welds and flanges. Our Safety Evaluation of Relief Request 89-01 is enclosed. As discussed in this evaluation, we conclude that the Code require-ment to hydrostatically test the repaired section of piping in the Nuclear Service Water System is impractical because the l butterfly valves of the system design do not provide for suffi-cient isolation and because hydrostatic testing could possibly damage the bellows assembly of the new expansion joint. More-over, the alternative tests thst you proposed-provide adequate assurance of the structural integrity of the repaired section of piping, and compliance with the specific Code requirement would result in hardship without a compensating increase in the level l of quality and safety. L n j ?008150103 900s09 KDN ADockocoog9

i 2 Mr. H. B. Tucker i l Duke Power Coupany McGuire Nuclear Station cc: Mr. A.V. Carr, Esq. Dr. John M. Barr; Duke Power Company Departsent of Environnental Health P. O. Box 33189 Mecklenburg County 422 South Church Street. 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 County Manager of Mecklenburg County Mr. Dayne H. Brown, Director 720 East Fourth Street Departnent of Environsental, Charlotte, North Carolina 28202 Health and Natural Resourccs Division of Radiation Protection P.O. Box 27687 Mr. J. S. Warren Raleigh, North Carolina 27611-7687 Duke Power Company Nuclear Production Departuent Mr. Alan R. Herdt, Chief P. O. Box 33189 Project Branch f3 l Charlotte, North Carolina 28242 U.S.. Nuclear Regulatory Comission 101 Marietta Street, NW, Suite 2900 J. Michael McGarry, III, Esq. Atlanta, Georgia 30323 Bishop, Cook, Purcell and Reynolds 1400 L Street, N.W. Ms. Karen E. Long Washington, D. C. 20005 Assistant Attorney General N. C. Departnant of Justice Senior Resident Inspector P.O. Box 629 c/o U.S. Nuclear Regulatory Comission Raleigh, North Carolina 27602 i 12700 Hagers Terry Road Huntersville, North Carolina 28078 .j l Regional Administrator, Region II l U.S. Nuclear Regulatory Comission 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 Ms. S. S. Kilborn Area Manager, Mid-South Area ESSD Projects i l Westinghouse Electric Corporation MNC West Tower - Bay 239 l-P. O. Box 355 Pittsburgh, Pennsylvania 15230 k 4 v .c.-e-- w- ,.-,.-3,-

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