ML20205C302

Forwards Safety Evaluation Supporting Licensee 860123 Submittal Re Matl Properties & Fast Neutron Fluence of Reactor Vessel in Compliance w/10CFR50.61 Concerning Fracture Toughness Requirements for Protection Against PTS

ML20205C302
Person / Time
Site:	Rancho Seco
Issue date:	03/13/1987
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Julie Ward SACRAMENTO MUNICIPAL UTILITY DISTRICT
Shared Package
ML20205C307	List: ML20205C302 ML20205C395
References
TAC-59976, NUDOCS 8703300153
Download: ML20205C302 (2)

Text

r fs March 13, 1987 I ) f

( b Docket No. 50-31? Distribution: Docket File O NRC & LPORs Branch Files RIngram OGC-Bethesda RWeller SMiner Fr. John E. Ward GKalman Llois Sacramento Municipal Utility District ACRS IE-3 Rancho Seco Nuclear Generating Station Post Office Box 15830, Mail Stop No. 291 Sacramento, California 95852-1830

SUBJECT:

RANCHO SECO NUCLEAR GENERATING STATION-FPACTUPE TOUGHNESS PEQUTFEMENTS FOR PROTECTION AGAINST PRESSURIZED THEPMAL SHOCK EVENTS (10 CFR 50.61)

By letter dated January 23, 1986, you submitted information en the material properties and fast neutron fluence of the Rancho Seco reactor vessel in compliance with the requirements of 10 CFR 50.61. We have completed our review of the information. From our review of the material properties, we have concluded that the controlling material has been properly identified and the justifications given for the copper and nickel contents and the initial RT are acceptable. From our review of the neutron fluence on the inside sub1ceofthepressurevessel,wehaveconcludedthattheRanchoSeco pressure vessel meets the fracture toughness requirements of 10 CFR 50.61 for operation to the end of the current license. Our Safety Evaluation Report (SER) is enclosed for your information. However, we request that you subnit periodic future reevaluations of the RT and corresponding comparisons with the predictions in your letter dated Jabry 23, 1986 (Reference 1 in the enclosed SER). These submittals can be included with submittals of Pressure-Temperature operating limits required by 10 CFR 50 Appendix G.

This request for additional infortnation was appioved by the Office of Panagement and Budget under clearance number 3150-0011, which expires September 30, 1989.

Sincerely,

/S/

John F. Stolz, Director PWR Project Directorate #6 Division of PWR Licensing-B

Enclosure:

As stated cc w/ enclosure:

See next Page 1 Anw j #6 PWR# 1 PWRR PWR

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s 'y Mr. lohn E. Ward . Rancho Seco Nuclear Generatinc

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Sacramento Municipal Utility District Stati6n CC:

Mr. David S. Kaplan. Secretary Sacramento Count _v and General Counsel Board of Supervisnrs Sacramento Municipal Utility 827 7th Street. Pnom 4?4 District Sacramento, California 95814  ;

6?01 S Street P. O. Rox 15830 Ps. Helen Hubbard Sacramento, California 95813 P. O. Box f,3 Sunol, California 94586 Thomas A. Baxter, Esq.

Shaw, Pittman. Potts & Trowbridoe

?300 N Street, N.W. .

Washington, D.C. 20037 l Mr. Pon Columbo l Sacramento Municipal Utility District 3

Pancho Seco Nuclear Generatinq Station 4440 Twin Cities Road L i Herald, California 95638-9799

Mr. Robert B. Borsum

Babcock & Wilcox Nuclear Power Generation Division  ;

Suite ??0, 7910 Woodmont Avenue Bethesda, Maryland 20814 i Pesident inspector / Rancho Seco c/o U. S. N. R. C. l 14410 Twin Cities Road Herald, California 95638 l

j Regional Administrator, Region V

U.S. Nuclear Regulatory Commission l 1450 Maria 1.ane, Suite 210 i Walnut Creek, California 94596 I

l Director

Energy Facilities Siting Division Energy Resources Conservation A Development Commission

! 1516 - 9th Street

! Sacramento, California 95814 Mr. Joseph 0. Ward, Chief .

Radiolooical Health Branch State Department of Health Services

' 714 P Street. Office Building #8 Sacramento, California 95814 i

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