Results of ninth regular inspection of No.2 plant in Mihama Power Station, Kansai Electric Power Co., Inc

The ninth regular inspection of No.2 plant in Mihama Power Station was carried out from December 18, 1984, to May 9, 1985. The parallel operation was resumed on April 16, 1985, 120 days after the parallel off. The facilities as the object of inspection were the reactor proper, reactor cooling system, measurement and control system, fuel facilities, radiation control facilities, waste facilities, reactor containment installation and emergency power generation system. On these facilities as the object of inspection, the appearance, disassembling, leak, functional, performance and other inspections were carried out, and as the results, abnormality was not found except that of 31 steam generator tubes. 25 tubes were repaired by using sleeves, and six tubes were plugged. The works related to this regular inspection were accomplished within the range of allowable radiation dose based on the relevant laws. The main reconstruction works carried out during this regular inspection were the exchange of the nuclear instrumentation panel outside the core, the installation of gas monitors for the time of accident, and the repair of 31 steam generator tubes, in which abnormality was found at the tube plate part. (Kako, I.)