ML20008F885

Comments on NUREG-0619.Valve Out Solution Acceptable & Preferable to Space Thermal Stressing of Nozzle.Facility Meets Feedwater Nozzle Cracking Requirements W/O Further Mods

ML20008F885
Person / Time
Site:	Zimmer
Issue date:	05/07/1981
From:	Flynn J CINCINNATI GAS & ELECTRIC CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
RTR-NUREG-0619, RTR-NUREG-619 NUDOCS 8105120253
Download: ML20008F885 (2)

Text

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n. k,"i[ [ L, TIIE CINCINNATI GAS & ELECTIIIC CONII'ANY rTIEk C - ." T CINCINNATt OHIO 45205 May 7, 1981

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I h D Docket No. 50-358

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\s\44,496 9 4Qv Mr. Harold Denton, Director i r

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission

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RE: WM . H . ZIMMER NUCLEAR POWER STATION -

UNIT 1 - COMMENTS ON NUREG 0613

Dear Mr. Denton:

This letter is in response to NUREG 0619 and a November 13, 1980 NRC letter from Dariell E. Eisenhut to OL applicants. This letter supplements a June 30, 1980 letter from Mr. E. A. Borgmann to Mr. H. Denton discussing the same topic. CG&E's response to NUREG 0619 is as follows:

In conjunction with our augmental ISI program, you are already aware that the Zimmer CRD return line-is carbon steel and thus not subject to IGSCC (see page E-7, comment 3 of NUREG 0619) .

CG&E believes that the valve out solution is an acceptable and preferable solution to the thermal stressing of the nozzle, rather than the cap and cut solution. Valving out is desirable in that it allows full use of the CRD system as a high pressure water source for the vessel should this ever be necessary. Please refer to our June 30, 1980 letter on this subject.

Additionally, at this stage of construction, cutting and capping would require many retests including an additional stress cycle due to the primary vessel hydrostatic test. CG&E does not believe cutting and capping of the CRD return line is technically justifiable for the Zimmer Station.

4-8105120153 /

To: Mr. Harold Denton, Director May 7, 1981 Re: Wm. H. Zimmer Nuclear Power Station Page #2 Unit 1 - Comments on NUREG 0619 With regard to the feedwater' nozzle cracking portion of NUREG 0619, the Zimmer plant meets this requirment as specified without further modification.

Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY r

By J S D. FLYNN, Manager Licensing and Environmental Affairs JDF:bt cc: Charles Bechhoefer M. Stanley Livingston Frank F. Hooper Troy B. Conner, Jr.

James P. Fenstermaker Steven G. Smith William J. Moran J. Robert Newlin William G. Porter, Jr.

E. A. Borgmann F. T. Daniels W. Peter Heile l James H. Feldman, Jr.

j John D. Woliver Mary Reder David K. Martin

! George E.'Pattison l Andrew B. Dennison l

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