Safety Evaluation Report Related to the Restart of Rancho Seco Nuclear Generating Station, Unit 1, Following the Event of December 26, 1985. Docket No. 50-312, Sacramento Municipal Utility District. Supplement No. 1

摘要

On December 26, 1985, the Rancho Seco Nuclear Generating Station experienced a reactor trip from 76% power, followed by a rapid overcooling transient and automatic initiation of the safety features actuation system. The unit has remained shut down since that time. In response to confirmatory letters from the NRC Region V Administrator, the licensee, Sacramento Municipal Utility District (SMUD), submitted the 'Rancho Seco Action Plan for Performance Improvement' in July 1986. Since then, the licensee has submitted revisions to that action plan and numerous other documents and information to support a return of Rancho Seco to power operation. The NRC staff reviewed the licensee's submittals and other information made available to the staff in support of a restart of Rancho Seco. In October 1987, the NRC staff issued a Safety Evaluation Report (NUREG-1286) relating to the restart of Rancho Seco. Since then, the staff has completed its review of all other issues relating to the restart effort. The results of this more recently completed review work are contained in the Supplement No. 1 to NUREG-1286.