ML19274E647

In Order to Complete Safety Evaluation of OL Application, Requests Addl Info Re Limiting Transients Using Odyn Code

ML19274E647
Person / Time
Site:	Zimmer
Issue date:	03/21/1979
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Borgmann E CINCINNATI GAS & ELECTRIC CO.
References
NUDOCS 7904090394
Download: ML19274E647 (4)

Text

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MAR 2 I 1979 Docket No: 50-358 Mr. Earl A. Borgmann Vice President - Engineering Cincinnati Gas & Electric Ccmpany P. O. Box 960 Cincinnati, Ohio 45201

SUBJECT:

REQUEST FOR ADDITI0tML INFORMATION - WM. H. ZIMMER, UNIT NO.1 In order that we may continue our review of your application for a license to operate the Zimer Nuclear Power Station, Unit No.1, your responses to the enclosed positions (and requests for additional infonnation) are needed.

The positions (and requests) are based upon information contained in your application as amended through Revision 54 and your responses to our previous requests.

We will need your responses to these positions (and requests) by April 30, 1979.

If you cannot meet this date, please advise us within two weeks of receipt of this letter of your date for complete response.

Please contact us if you desire infonnation or clarification regarding the enclosure.

Sincerely,

/

JohnF.Stolz,Chie ight Water Reactors Branch No. 1 Division of Project Management

Enclosure:

Requests for Additional Infomation cc:

See next page 7904090 M S

Mr. Earl A. Borgmann MAR 211979 cc: iroy B. Conner, Jr., Esq.

David B. Fankhauser, PnD Conner, Moore & Corber 3569 Nine Mile Road 1747 Pennsylvania Avenue, N. W.

Cincinnati, Ohio 45230 Washington, D. C.

20006 Thomas A. Luebbers, Esq.

Mr. William J. Moran Cincinnati City Solicitor General Counsel Room 215, City Hall The Cincinnati Gas and Electric Cincinnati, Ohio 45202 Company P. O. Box 960 Mr. Stephen Schumacher Cinnati, Ohio 45201 Miami Valley Power Project P. O. Box 252 Mr. William G. Porter, Jr.

Dayton Ohio 45401 Porter, Stanley, Arthur and Platt Ms. Augusta Prince, Chairperson 37 West Broad Street 601 Stanley Avenue Columbus, Ohio 43215 Cincinnati, Ohio 45226 Mr. Peter H. Forster, Vice President Charles Bechhoefer, Esq., Chairman Energy Resources Atomic Safety & Licensing Board The Dayton Power and Light Panel Company U. S. Nuclear Regulatory Commission P. O. Box 1247 Washington, D. C.

20555 Dayton, Onio 45401 J. Robert Newlin, Counsel The Dayton Power and Lighc Company P. O. Box 1247 Dayton, Ohio 45401 Mr. James D. Flynn Manager, Licensing Environmental Affairs The Cincinnati Gas and Electric Company P. O. Box 960 Cincinnati, Ohio 45201 Mr. J. P. Fenstermaker Senior Vice President-0perations Columbus and Southerr, Ohio Electric Company 215 North Front Street Columbus, Ohio 43215

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ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION WM. H. ZIMMER ROUND-TWO QUESTIONS Introduction This enclosure consists of the twenty-third in a series of positions (and requests for additional information). We will need your response to them in order to complete our safety evaluation of your Zimmer OL application the position (and requests) are in the area of:

212.0 Reactor Systems It will be helpful to us if your responses are in a " position and Response" fonnat using the same number designation as the position.

The first number designated the review area and the second (in parentheses) designated the associated section of tne FSAR. Of course, your responses should include revision to the FSAR wherever appropriate.

NOTE:

You are requested to reanalyze the transient exhibiting the largest AMCPR (Generator Load Rejection Without Bypass) with the ODYN code in order to conform to staff requirements.

The enclosed, provides our requirements for the reanalysis.

212-1 f

212.0 REACTOR SYSTEM BRANCH 212.75 Reanalyze the most limiting transient with respect tc iMCPR using the ODYN code.

The analysis may consider the use of reactor pump trip (RPT) to mitigate this transient.

Relief mode operation of the safety / relief valves may not be used because it does not meet our safety-grade requirements.

Describe any difference in systems, components, or equipment used to mitigate this transient from that used previously to analyze the transient reported in Section 15.1.1 of the Zimmer FSAR.

Provide a set of typical respons6 curves for this transient similar to those presented in Section 15.1.1.

Report the largest change in minimum critical pcwer ratio (AMCPR) found for this event. The staff will apply an appro-priate safety margin to the aMCPR in order to establish the operating MCPR.

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