ML20211A325
| ML20211A325 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/06/1986 |
| From: | Julie Ward SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| JEW-86-540, NUDOCS 8610150080 | |
| Download: ML20211A325 (2) | |
Text
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e, esuun SACRAMENTO MUNICIPAL UTiuTY DISTRICT C P. O. Box 15830, Sacramento CA 95852 1830,(916) 452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA
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October 6, 1986 JEW 86-540
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DIRECTOR Of NUCLEAR REACTOR REGULATION J
ATTN JOHN f STOLZ CHIEF i
OPERATING REACTORS BRANCH 4 U S NUCLEAR REGULATORY COMMISSION WASHINGTON DC 20555 DOCKET 50-312 RANCHO SECO NUCLEAR GENERATING STATION UNIT NO. 1 REACTOR VESSEL MATERIALS SURVEILLANCE PROGRAM
Dear Mr. Stolz:
SMUD is participating in the B&W Integrated Reactor Vessel Materials Surveillance Program with the Toledo Edison Company's Davis-Besse Unit I reactor serving as the host reactor for Rancho Seco surveillance capsules.
The Technical Specifications for Rancho Seco require the submittal of a report, or an application for a facility operating license amendment, whenever (starting one year af ter Davis-Besse begins commercial operation at 100%
power) Davis-Besse does not maintain a cumulative reactor utilization factor of 65% or greater.
This letter constitutes that report.
Davis-8 esse reached 100% power on July 1, 1978, and as of this date has not maintained the required utilization factor.
However, the current Rancho Seco Technical Specifications related to reactor vessel material irradiation allow for an accumulated neutron fluence corresponding to eight effective full power years (EFPY) of operation. As of December 26, 1985, Rancho Seco had experienced approximately 5.3 EfPY and will reach only approximately 6.2 EfPY at the end of the next fuel cycle.
A Rancho Seco surveillance capsule was withdrawn from Davis-Besse during the second quarter of 1980.
Testing and data evaluation for the material specimens in this capsule were performed. As a result, revised Technical Specifications to extend operation from five EfPY to eight EfPY, were issued July 11, 1984.
A second Rancho Seco surveillance capsule was withdrawn from Davis-Besse during 1982.
The results of this capsule's evaluation (BAW-1792) supports operation up to 15 EfPY (see District submittal dated July 18, 1984).
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8610150080 861006 PDR ADOCK 05000312
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0 DISTRICT HEADQUARTERS O 6201 S Street, Sacramento CA 95817 1899
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John F. Stolz JEW 86-540 October 6,1986 The present Technical. Specifications relating to reacter vessel material irradiation remain valid. The limits will be modified prior to expiration both to account for ongoing irradiation and to extend the applicability period. We feel that continued operation of Rancho Seco is therefore acceptable.
If you have any questions, please feel free to contact me or Robert Little at (916) 732-6012.
Sincerely, JOHN E. WARD DEPUTY GENERAL MANAGER, NUCLEAR cc: Sydney Miner, NRC, Bethesda G. Perez, NRC, Rancho Seco