ML20244A636

Responds to D Verrellis Request for Addl Info Re Mod of Feedwater Nozzle & Sparger.Ge Licensing Rept NEDE-21821,dtd Mar 1978,provides Discussion of Causes & Proposed Solutions to Cracking Problems in BWRs

ML20244A636
Person / Time
Site:	Hatch
Issue date:	05/16/1979
From:	Whitmer C GEORGIA POWER CO.
To:	Office of Nuclear Reactor Regulation
References
TAC-08493, TAC-08494, TAC-8493, TAC-8494, NUDOCS 7905230538
Download: ML20244A636 (1)

Text

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Georgo Power Company 8

5 230 Peac'. tree Street 1

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May 16, 1979 M

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Georgia Power Cha s. F. Whitmar Vice President Engineenng ite sontun e.de tra v.ti m Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.

20555 NRC DOCKET 50-321 OPERATING LICENSE DPR-57 EDWIN I. HATCH NUCLEAR PLANT UNIT 1 FEEDWATER N0ZZLE AND SPARCER MODIFICATION Gentlemen:

Georgia Power Company submits the following information pursuant to Mr.

Dave Verrelli's request concerning the modification of the Plant Hatch Unit 1 feedwater nozzle and sparger. General Electric Company's Licensing Topical Report NEDE-21821 dated March 1978, supplemented in January 1979, provides a discussion of the causes of and proposed solutions to the cracking problems which have occurred in the feedwater nozzles and spargers of coiling water reactors. These reports and associated recommendations (Feedwater Nozzle Interim Examination Recommendation, dated February 23, 1976, and the Service Information Letter, No. 207, dated November 19, 1976) form the basis for our decision to conduct the preventative modifications to the system now being undertaken at Plant Hatch Unit 1.

The reactor pressure vessel (RPV) feedwater nozzle and sparger repair will involve four major steps:

the removal of the existing feedwater spargers, nozzle cladding removal by machining, extensive examination of RPV feedwater nozzles and saf e-ends, and the installation of the improved interf erence fit _

feedwater spargers. Each step of the modification is controlled by procedures and specifications.

If further specific details of these procedures and specifications are required, please contact this office.

Yours very truly, I y

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Ruble A. Thomas George F. Trowbridge, Esquire 190523o538 4

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