ML20137V285
| ML20137V285 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 09/30/1985 |
| From: | Reinaldo Rodriguez SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| RJR-85-467, NUDOCS 8510040002 | |
| Download: ML20137V285 (2) | |
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$SMUD SACRAMENTO MUNICIPAL UTIUTY DISTRICT [] 6201 S Stieet, P.O. Box 15830 Sacramento CA 95852-1830,(916) 452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA RJR 85-467 September 30, 1985 DIRECTOR OF NUCLEAR REACTOR REGULATION ATTENTION JOHN F STOLZ CHIEF OPERATING REACTORS BRANCH 4 U S NUCLEAR REGULATORY COMMISSION WASHINGTON 0 C 20555 DOCKET 50-312 RANCHO SECO NUCLEAR GENERATING STATION UNIT NO. 1 REACTOR VESSEL MATERIALS SURVEILLANCE PROGRAM SMUD is participating in the B&W Integrated Reactor Vessel Materials Surveillance Program with the Toledo Edison Company 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 after Davis-Besse begins commercial operation at 100% full power), Davis Besse does not maintain a cumulative reactor utilization factor of 65% or greater.
Davis-Besse reached 100% full 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 are valid for an accumulated neutron fluence corresponding to eight effective full power years (EFPY) of operation. As of March 30, 1985, Rancho Seco had experienced approximately 5.2 EFPY and will reach only approximately 6.2 EFPY at the end of the next fuel cycle.
Further, a Rancho Seco surveillance capsule was withdrawn from Davis-Besse during the second quarter of 1980.
festing and data evaluation for the material specimens in this capsule have been completed. As a result, revised Technical Specifications for operation beyond five EFPY, to eight EFPY, were issued July ll, 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A second Rancho Seco surveillance capsule was withdrawn from Davis-Besse during 1982.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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J:hn F. Stolz RJR 85-467. September 30, 1985 Therefore, as the present Technical Specifications related to reactor vessel material irradiation remain valid, and the limits will be modified before
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expiration to account for ongoing irradiation and to extend the applicability period, continued operation of Rancho Seco is acceptable.
If you have any questions, please feel free to contact me or Robert Dieterich at (916)-732-6018.
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R. J. R00 IGUEZ ASSISTANT GENERA NANAGER, NUCLEAR l
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