ML20059B445

Requests That NRC Approval of Original Relief Request 89-02 Be Extended to Include Changes to Mods MG-22233 & MG-22243 as Described.Hydrostatic Testing Impractical Due to Inadequacy of Test Boundaries

ML20059B445
Person / Time
Site:	Mcguire, McGuire
Issue date:	08/20/1990
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9008290078
Download: ML20059B445 (4)

Text

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. l Duke herr Company Hu B ha.v s Pu Ika.t3tM ike President  ;

Charlotte, N C Z8242 Nuclear 1%tuction (704)3734L11 DUKEPOWER August 20, 1990 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk j

Washington, D.C. 20555

Subject:

McGuire Nuclear Station, Units 1 and 2 I Docket Nos. 50-369 and 50-370 ,

ASME Section XI Hydrostatic Testing Requirements p Relief Request. No. 89-02, Revision r

Cent.lemen ,

By letter .ed February 16, 1989, we requested relief from ASME Section XI hydrostatic, testing requirements pertaining to modifications planned for the McGuire Nuclear Service Water (RN) system. The NRC staff approved our request by letter dated June 29, 1989. Subsequent to your approval, and prior to our impicmentation of the modifications, changes to modifications MG-12243 Unit I and MG-22243. Unit 2 were necessary. By letter dated

-January 22, 1990 we revised our relief request to reflect the changes to the modification. By letter dated April 4, 1990 the NRC staff approved the revision.

In the original scope of the modifications, we planned to replace some carbon steel piping with stainless steel (SS) piping. In an effort to further reduce corrosion / erosion associated with carbon piping, we have made '

additional changes to the W G e+1ons that would replace a 20 inch carbon steel 90 degree elbow pipe with SS pipe. Additionally we plan to replace i another straight section of 20 inch carbon pipe with SS pipe (see attached drawing for details). The connections will be made using grove welds. In lieu of hydrostatic testing, all welds in the modification will be subjected to a dye penetrant or magnetic particle examination on root pass and iinished weld. An in-service leak test will further verify the new connections do not leak.

We request that NRC staff approval of our original Relief Request (No.

89-02) be extended to include the changes to modifications MG-22233 and NG-22243 as described. The original basis for our request for relief from hydrostatic testing is still valid. Hydrostatic testing is impractical due to the inadequacy of the test boundaries. The hydrostatic test boundary isolation valves include 36 inch, 20 1,tich, and 18 inch butterfly valves.

These valves have a history of leakage and do not offer adequate isolation to permit a hydrostatic test.

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ADOCK 05000369 PDC Id[

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U.S. Nuclear Regulatory Commission ATTN: Document Contrel Desk August 20,.1990 Page 2 Our Unit 2 refueling outage is scheduled to begin around September 1, 1990.

Implementation of this modification is scheduled for this outage; therefore, we request approval of this revision prior to November 12, 1990. This date coincides with the current schedule for entering Mode 4.

Should there be any questions concerning this matter, pinase contact Steve LeRoy at (704) 373-6233.

Very truly yours, 44 g llal B. Tucker SEL567 Attachment xc Mr. S.D. Ebneter, Region II Administrator U.S. Nuclear Regulatory Commission 101 Marietta St., NW, Suite 2900 Atlanta,.GA 30323 Mr. D.S. Ilood, Project Manager U.S. Nuclear Regulatory Commission Office of Nuc1 car Reactor Regulation Washington, D.C. 20555 Mr. P.K. Van Doorn NRC Senior Resident Inspector McGuire Nuclear Station

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