ML20239A542

Forwards Safety Evaluation Accepting Topical Rept A-85-11, Retran Computer Code Reactor Sys Transient Analysis Model Qualification, for Use in Performing plant-specific best- Estimate Transient Analysis.Technical Evaluation Encl

ML20239A542
Person / Time
Site:	Calvert Cliffs
Issue date:	09/09/1987
From:	Mcneil S Office of Nuclear Reactor Regulation
To:	Tiernan J BALTIMORE GAS & ELECTRIC CO.
Shared Package
ML20239A543	List: ML20239A542 ML20239A546 ML20239A550
References
TAC-60647, TAC-60648, NUDOCS 8709170423
Download: ML20239A542 (3)

Text

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September 9, 1987 Docket Nos. 50-317 DISTRIBUTION and 50-318 ' Docket File. C. Vogan NRCPDR S. McNeil Local PDR E. Jordan PDl-1 Rdg. J. Partlow S. Varga ACRS(10)

Mr. J. A. Tiernan B. Boger L. Tripp Vice President-Nuclear Energy OGC C. Liang Baltimore Gas and Electric Company J. Johnson,RI P. O. Box 1475 Baltimore, Maryland 21203

SUBJECT:

SAFETY EVALUATION OF BGRE REPORT A-85-11. "RETRAN COMPUTER CODE REACTOR SYSTEM TRANSIENT ANALYSIS MODEL QUALIFICATION" (TACS 60647/60648)

We have completed our review, with the assistance of International Technical Services, Inc., of your letter dated January 31, 1986 which submitted your plant-specific BG&E report A-85-11, "RETRAN Computer Code Reactor System Transient Analysis Model Qualification," for Corrnission review and approval.

This report was later supplemented by your submittals of March 7,1986 December 31, 1986, February 24, 1987, and June 9, 1987.

We have concluded that you have demonstrated, in the above stated submittals, the capability to properly develop RETRAN models for Calvert Cliffs Units 1 and 2 and to perform best-estimate simulation of reactor system non-LOCA transients using the;e models. BG&E indicated in its letter dated January 31, 1986 that this analytical capability will primarily be used to support the evaluation of proposed changes and revisions to operating procedures.

It is noted that you used RETRAN 02/ MOD 03 which was developed as a result of making corrections necessitated after the NRC staff review of the RETRAN 02/ MOD 02 computer code. This corrected version of the code has not been approved by the staff. Nevertheless, we believe that there is reasonable assurance that this version of the code is adequate for use in this report (A-85-11) and for its use in your best-estimate model, unless some future NRC review of RETRAN 02/ MOD 03 contradicts this assumption.

The Commission finds that the use of this RETRAN computer code as presented in the BG&E report A-85-11, is acceptable for use in performing plant-specific best-estimate transient analyses for the Calvert Cliffs Nuclear Power Plant Units 1 and 2.

8709170423 070909 DR ADOCK050g37

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2-This report has neither been reviewed nor approved by the NRC for any other use than the Calvert Cliffs best-estimate transient analyses. For further BG&E licensing analyses, you should submit sufficient information to demonstrate that the licensing calculations are performed using a plant model incorporated with appropriate conservatism to assure that uncertainties in both plant operatin models (g conditions (dealt with by modifying code input) and phenomenologica treated in each analysis in a conservative manner.

Enclosed herein is our Safety Evaluation and its associated Technical Evaluation Report.

Sincerely, i

Scott Alexander McNeil Project Manager Project Directorate I-1 Division of Reactor Projects, I/II

Enclosure:

As stated cc: See next page

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. Mr. J. A. Tiernan Baltimore Gas & Electric Company Calvert Cliffs Nuclear Power Plant cc:

Mr. John M. Gott, President Regional Administrator, Region I Calvert County Board of U.S. Nuclear Regulatory Commission Commissioners Office of Executive Director Prince Frederick, Maryland 20768 for Operations 631 Park Avenue D. A. Brune, Esq. King of Prussia, Pennsylvania 19406 General Counsel Baltimore Gas and Electric Company P. D. Box 1475 Baltimore, Maryland 21203 Jay E. Silberg, Esq.

Shaw, Pittman, Potts and Trowbridge 1800 M Street, NW Washington, DC 20036 Mr. M. E. Bowman, General Supervisor Technical Services Engineering Calvert Cliffs Nuclear Power Plant MD Rts 2 & 4, P. O. Box 1535 Lusby, Maryland 20657-0073 Resident Inspector c/o U.S. Nuclear Regulatory Commission P. O. Box 437 Lusby, Maryland 20657-0073 Bechtel Power Corporation ATTN: Mr. D. E. Stewart Calvert Cliffs Project Engineer 15740 Shady Grove Road Gaithersburg, Maryland 20760 Combustion Engineering, Inc.

ATTN: Mr. W. R. Horlacher, III Project Manager P. O. Box 500 1000 Prospect Hill Road Windsor, Connecticut 06095-0500 Department of Natural Resources Energy Administration, Power Plant Siting Program ATTN: Mr. T. Magette Tawes State Office Building Annapolis, Maryland 21204