ML20062B622

Advises That Plant Operation in Cycle 7 Acceptable W/Thermal Margins for Core Loadings Containing Mixture of Toprod & Exxon Std Fuel Assemblies

ML20062B622
Person / Time
Site:	Prairie Island
Issue date:	07/22/1982
From:	Clark R Office of Nuclear Reactor Regulation
To:	Musolf D NORTHERN STATES POWER CO.
Shared Package
ML20062B626	List: ML20062B622 ML20062B636 ML20062B645
References
NUDOCS 8208040642
Download: ML20062B622 (2)

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AL 22 I 82 DJSTRIBUTION:

h b - 86 O' O vDocket File NRC PDR

. L PDR Docket Mos. 50-282 NSIC and 50-306 ORB #3 Rdg l DEisenhut JHeltemes i OELD ,

Mr. D. M. Musolf . I&E

Huclear Support Services Dcphrtment ACRS-10

Northern States Power Conpany RAClark 414 Nicollet Mall - Oth Floor PMKreutzer-3

Minneapolis, Minnesota 55401 DCDilanni Gray File

Dear Mr. Musolf:

i By. letter dated March 12, 1902 the EXX0ff Huc1 car Company submitted for our r[' c review a topical report titled " Application of EXXON Uuclear Co. PUR Thermal Margin Methcdology to Mixed Core Configurations" XN-NF-83-21(p); dated March l 1982. You are referencing this report in your reload analysis for the Prairie +

Island Huclear Generating Plant under the provisions of 10 CFR 50.59. The analytical acthods in this topical report are applicable to Unit 1 (Cycle 7.)

and Unit 2 (Cyclef7) since each core loading contains 40 TOPROD fuel assemblies i mixed with the standard EXXON assenblics. Other analytical methods that you are referencing in your reload analysis for TOPROD fuel assemblics appear in i the topical report. titled " Generic Mechanical, Thermal Hydraulic and Neutronic

Design for EXX0M Huclear TOPROD Reload Fuel.assemblics for Pressurized Water

Reactors" Xff-NF-30-56(p) dated November 1900.

ByourletterdatedNovenberIb,1981toEXXONNuclearCompanyInc,theNuclear Regulatory Commission excluded the acceptance of supplement No. I to the topical i report XN-UF-00-56(p). dealing with thernal margins, since we had not conpleted

! our evaluation. However, since that time our evaluation of topical report XM-NF-00-5G(p) supplement No. 1 & XR-NF-D2-21(p) has progressed to a point '

sufficient for us to conclude that the thermal margins for Unit No. 1 (Cycle

7) and Unit No. 2 (Cycle 7) are adequate to compensate for uncertainties i related to the analytical nethods employed by the EXX0H Uuclear. Company.

Thereforeaes. conclude that the operation in Cycle 7 at the Prairie Island Nuclear Generating Plant finits 1 and 2 is acceptable with respect.to the

, thermal margins for core loadings containing a nixture of TOPROD and EXX00 i

standard fuel assemblies.

Copics of the safety evaluations for bcMgW3f Qnadeyenclosed.

! k. r[aikghedby'

! Robert A. Clark, Chief 8208040642 820722 Operating Pcactors Granch'#3 gDRADOCK05000 Division of Licensing cc: See next page ,

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Northern States Power Company cc: ,. ,

Gerald Charnoff, Esquire Shaw, Pittman, Potts and Trowbridge 1800 M Street, N.W.

Washington, D. C. 20036 Mr. Louis J. Breimburst Mr. R. L. Tanner Executive Director County Auditor Minnesota Pollution Control Agency Red Wing, Minnesota 55066 1935 W. County Road B2 .

Roseville, Minnesota 55113 U. S. Environmental Protection Agency Federal Activities Branch The Environmental Conservation Library Region V Office -

Minneapolis Pubite Library ATTN: Regional Radiation 300 Nicollet Mall Representative Minneapolis, Minnesota 55401 230 South Dearborn Street Chicago, Illinois 60604 Mr. F. P. Tierney, Plant Manager

• Prairie Island Nuclear Generating Plant Northern States Power Company Route 2 Welch, Minnesota 55089 Jocelyn F. Olson, Esquire Special Assistant Attorney General Minnesota Pollution Control Agency 1935 W. County Road B2 Roseville, Minneosta 55113 U.S. Nuclear Regulatory Commission Resident Inspectors Office Route #2, Box 500A ,

Welch, Minnesota 55089 Regional Administrator Nuclear Regulatory Commission, Region III Office of Executive Director for Operations 799 Roosevelt Road Glen Ellyn, Illinois 60137

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