ML19270F610

Forwards Topcial Repts Re Lattice Physics Methods & Core Simulations

ML19270F610
Person / Time
Site:	Browns Ferry
Issue date:	02/20/1979
From:	Gilleland J TENNESSEE VALLEY AUTHORITY
To:	Kniel K Office of Nuclear Reactor Regulation
Shared Package
ML19270F611	List: ML19270F610 ML19270F612 ML19270F613 ML19270F614
References
NUDOCS 7902280314
Download: ML19270F610 (4)

Text

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t TENNESSEE VALLEY AUTHCRITY ce4 Asccar TE mtssEI 2m'

' 500C Chestnut S treet Tower II February 20, 1979 Director of Nuclear Reactor Regulation A tten tion : Mr. Karl Kniel, Chief Core Performance Branch U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Kniel:

PROPOSED TOPICAL REPORT ON LATTICE PHYSICS METHODS AND CORE SIMULATIONS In reference to your June 6, 1978, letter to Mr. Wats on , the Tennessee Valley Authority (TVA) s ubmits for your review 40 copies of each of the following * ]pical reports , TVA-TR78-02,

" Methods for the Lattice Physics Analysis of LWR's," TVA-TR78-03, "Three-Dimensional LWR Core Simulation Methods , " and TVA-TR79-01,

" Verification of TVA Steady-S tate BWR Physics Methods ."

Beginning with Browns Ferry unit 3, cycle 4, TVA intends to perform the steady-state final fuel cycle design analyses including the calculation of reactivity characteristics to be used as input to transients analyses performed by the General Electric Company.

Browns Ferry unit 3, cycle 4 is scheduled to be loaded in the fall of 1980 and TVA's calculations to support this reload effort must begin in the fall of 1979. We plan to use the methods described in the topical reports to perform all steady state physics calculations for BWR reload fuel cycle planning, design and licensing applications. Included are the following activities :

1. Specification of number and type of fuel assemblies;

2. Development of loading patterns;

3. Determination of cycle exposure cap ability ;

4. Specification of EOC target exposure distribution;

5. Evaluation of shutdown margin;

6. Evaluation of worth of Standby Liquid Control System; and

7. Development of kinetics input data for transient analyses.

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Director of Nuclear Reactor Regulation Therefore, it would be appreciated if your review and acceptability determinations for the three enclosed topicals could be completed by September 1, 1979. We would be pleased to meet with your staf f to discuss the contents of the reports if you believe it would be helpful.

Also enclosed is a copy of TVA's Relcad Design Analysis Plan that was requested in the August 15, 1978, meeting with you and the NRC staf f.

Very truly yours ,

.i f

J. E. Gilleland Assistant Manager of Power Enclosures

E!!CLOSUPJ:

TVA's RELOAD DESIG!J AiALYSIS PLA!!

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In 1977 TVA management endorsed a five year program to acquire the capability to independent 1v perforn reload fuel cyc1 design analyses and to use that capability for olanning and licensing purposes. This ability is to be used in successive chased stages recc'nizing that the fuel suppliers will retain detailed design responsibility for the individual fuel assembly. The application of that program ,o steady-state design and operational transients will enable TVA to license reload cveles for operation with significantiv less analvtical support from the fuel supplier. The attached table describes our overall program that eradually assumes increasing responsibility in an orderly and planned manner consistent with demonstrated capabilities.

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NRC Approval Vendor Topical Submittal TVA Topical Date Requested __ Eaulvalent Lattice Physics February 79 September 79 NEDE-20953 1.

Methods February 79 September 79 NEDE-20913 P

2. Nodal Simulator Methods BWR Physics Methods Februarv 79 September 79 NED0-20946 A 3.

NEDO-20939 Verification

4. BWR Operational ffarch 80 March 81 Transients

5. PDO-7 ffodel for October 80 October 81 PWR

6. PUR Physics ffethods October 80 October 81 Verification

7. PUR Operational October 80 October 81 Transients