Results of evaluation of periodic safety review for No. 1 plant in Tsuruga Power Station, Japan Atomic Power Co

No. 1 plant in Tsuruga Power Station started the commercial power generation in March, 1970, and has continued the operation for 24 years. The state of No. 1 plant in Tsuruga Power Station is to be recollected from the viewpoints of the comprehensive evaluation of operation experiences and the state of reflecting latest technological knowledge, and the safety and reliability are to be further improved in the periodic safety review. Agency of Natural Resources and Energy evaluated the report of the periodic safety review for No. 1 plant in Tsuruga Power Station, and summarized the results. The course of the evaluation of the report is shown. The facility utilization factor is 65.6% on the average of about 24 years, but in the last 10 years, it was improved to 73%. The rate of occurence of unexpected shutoff is 1.2 times/year in the last five years. Those are the results of preventive maintenance and the improvement of the facilities and operation management. Operation management, maintenance management, fuel management, radiation control and radioactive waste management have been carried out without serious troubles. The work plan for preventing disasters has been established, and the experience of troubles is well reflected to countermeasures. Also the latest technological knowledge has been reflected for improving the safety. (K.I.)