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OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2005

2006 Asian ISOE ALARA Symposium. OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2005. October 12, 2006 Shigeyuki Wada Safety Information D i vision Japan Nuclear Energy Safety Organization (JNES). Contents. General Status of NPPs in Japan Analysis of Exposure in FY 2005

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OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2005

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  1. 2006AsianISOEALARASymposium OCCUPATIONALEXPOSUREatJAPANESENUCLEARPOWERPLANTSin2005 October12, 2006 ShigeyukiWada Safety Information Division Japan Nuclear Energy Safety Organization(JNES)

  2. Contents • General Status of NPPs in Japan • Analysis of Exposure in FY 2005 • Improvement on Inspection Way

  3. Nuclear Power Plants in Japan as of March 31, 2006

  4. Shika 志賀 Oma Namie Kodaka Fugen ふげん Tomari (2003 ) (on a decommissioning stage since 2003) 年より廃止措置準備中 Kashiwazaki- kariwa Higashi Dori Monju 2 2 (FBR)) (FBR)) ( ( Higashi Dori TEPCO TEPCO Onagawa 女川 Tsuruga 敦賀 2 2 1 1 Fukushima Daiichi 福島第一 Mihama 8 8 7 7 Fukushima Daini Oi Tokai Takahama (On the decommissioning stage since 1998) Tokai No. 2 ３ Shimane Kaminoseki Hamaoka 5 5 5 5 5 Ikata Genkai Sendai 出力規模 Output scale In operation Total 55 Units 49,580MWe Under Construction 合計 53 基 出力 47,122MWe (PWR 23 units, BWR 32 units ) Less than More than 50 kW 万 未満 Less than 100 kW 100 kW 万 未満 万 以上 On planning stage 500,000kW 1,000,000kW 1,000,000kW Nuclear Power Plants in Japan 55 Units in Operation (PWR 23, BWR 32) as of March 31, 2006

  5. Trend of Capacity Factor in Japanese plants

  6. OccupationalExposurein2005FiscalYear(April2005–March2006)

  7. IndividualDosein200５　FiscalYear(April2005–March2006)

  8. Trend of BWRExposureperUnitinJapanese plants

  9. Trend of PWRExposureperUnitinJapanese plants

  10. Trend of Maintenance Exposureat Japanese BWRs

  11. Trend of Maintenance Exposureat Japanese PWRs

  12. BWR Average Exposure per Unitby Country

  13. PWR Average Exposure per Unitby Country

  14. BWRThreeYearRollingAveragebyPlantinUSAandJapan Fukushimamaiich

  15. PWRThreeYearRollingAveragebyPlantinUSAandJapan

  16. 　５-year Dose Reduction GoalsinUSA ( )2005 Quarter 3 Performance

  17. Dose Rate at PLR Piping in both Japanese BWR and US BWR

  18. Dose Rate at PLR Piping in both Japanese BWR and US BWR Median:0.89 mSv/h Median:1.55 mSv/h Number Japan:2000.12-2003 USA :2005.1 mSv/h at PLR Piping

  19. Operation Period and Maintenance Period by Countryfrom1994to2004 OperationPeriod(days) Capacity Factor 90% Capacity Factor 80% MaintenancePeriod(days) ◆USA ■Finland ▲Korea ×Japan жSwitzerland ●Belgium

  20. MandatoryInspection Items in JapaneseBWRs * *Shall be inspected within 13months after former inspection

  21. MandatoryInspection Items in JapanesePWRs

  22. Improvement on Inspection Way NISA submitted the draft report “ Improvement on Inspection Way for Nuclear Facilities ” September 2006. (Utilities) Maintenance program ・Condition-directive maintenance ・Time-based maintenance ・Online maintenance Approval NISA (Applied in 2008)

  23. Summary • Japanese plants had 1.21 person-Sv/unit in 2005 which is lower than 2004 by 0.23 person-Sv. However it is still the highest level in the world. • Japanese plants do not have much source term and perform relatively more maintenance work which may increase the exposure. • NISA submitted the draft report for the improvement on inspection way including maintenance program with condition-directive maintenance and online maintenance etc. • It is expected that the maintenance improvement will promote to decrease the exposure in Japanese plants.

  24. Thank you for your attention !!

  25. Source Term Reduction Measures inJapanese BWRs

  26. Source Term Reduction Measures inJapanese PWRs

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