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Applied Primary Water Chemistry Program * ALARA Activities at Ohi NPP Ohi Nuclear Power Plant Kansai Electric Power Co., Inc. Outline of Ohi NPP Unit 1　　1,175MW Started March 1979 Unit 2　　1,175MW Started December 1979 Unit 3　　1,180MW Started December 1991 Unit 4　　1,180MW Started February 1993 Osaka Kansai Wakasa ○Fukui Japan １ ○World’s best reliability ?Capacity factor: Over 92% (three-year-average) ?Unplanned capacity factor loss: 0.2% and below (three-year-average) ?Dose: 1.4 man?Sv (three-year-average) ?Automatic Shutdown: 0.1 time (three-year-average) ?Solid nuclear waste production: 1,000 drams and less (three-year-average) ?Days without labor accidents: Continuing more than 1000 days ?World’s best reliability ?World-class economic efficiency ?World-class nuclear power plant Three strategies for the vision Vision for 2010 Vision for 2010 Vision of Ohi NPP for the 21 century “The best nuclear power plant in the world” Actions to achieve the vision Established goals and strategies to achieve the vision In view of major changes in the management environment and present status of the company, the vision for 2010 was introduced to survive the 21 century. ２ 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 Main Measures Taken at Ohi NPP to Reduce Dose Use of automatic positioner of R/V stud bolt tensioner Use of cavity decontamination equipment Use of tube-sheet inspection robot during S/G tube ECT 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 Use of lead shielding of R/V head Decontamination of RCP internals Introduction of automatic equipment Reduction of dose equivalent in working environment Chemical cleaning of inside of primary coolant thermometer bypass piping/removal of piping Decontamination of primary coolant piping internal surface Decontamination of S/G channel head Streamlining work activities Permanent installation of S/G tube ECT cable Use of S/G tube ECT probe Use of S/G manway head handling tool Use of dose equivalent rate indicator P