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OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2006

2007 ISOE Asian ALARA Symposium. OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2006. September 12-14, 2007, Seoul, Korea Yoshihisa Hayashida Safety Information D i vision Japan Nuclear Energy Safety Organization (JNES). Nuclear Power Plants in Japan. as of March 31, 2007.

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OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2006

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  1. 2007 ISOE Asian ALARA Symposium OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2006 September 12-14, 2007, Seoul, Korea Yoshihisa Hayashida Safety Information Division Japan Nuclear Energy Safety Organization (JNES)

  2. Nuclear Power Plants in Japan as of March 31, 2007

  3. Shika 志賀 Oma Namie-Odaka 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 49,467MWe 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

  4. Trend of Capacity Factor in Japanese plants

  5. Individual Dose in Fiscal Year 2006 (April 2006 – March 2007)

  6. Trend of Individual Average Dose in Japanese plants

  7. Collective Dose in Fiscal Year 2006 (April 2006 – March 2007)

  8. Trend of BWR Average Collective Dose per Reactor in Japanese Plants

  9. Trend of PWR Average Collective Dose per Reactor in Japanese Plants

  10. Trend of Maintenance Exposure at Japanese BWRs

  11. Trend of Maintenance Exposure at Japanese PWRs

  12. Collective Dose During Outage vs. Year of Commercial Operation Started (BWR: 1996 - 2006)

  13. Collective Dose During Outage vs. Year of Commercial Operation Started (PWR: 1996 - 2006)

  14. BWR Average Collective Dose per Reactor by Country

  15. PWR Average Collective Dose per Reactorby Country

  16. BWR Three Year Rolling Average by Plant in USA and Japan

  17. PWR Three Year Rolling Average by Plant in USA and Japan

  18. Dose Rate at PLR Piping in Japanese BWR and US BWR

  19. Operation Period and Maintenance Period by Country from 1996 to 2005

  20. Further Exposure reduction • Japanese utilities are continuing the approach for further exposure reduction. • Regulatory side will encourages and support their activity. • The effort ofthe improvement on inspection way for nuclear facilities is continued in Japan.

  21. Summary • BWR average collective dose per reactor for 2006 decreased 3 years in a row, and the value of 1.33 person-Sv is the lowest in the past. • Average collective dose per reactor for PWRs shows a stable trend in general in around 1 person-Sv. • Relatively much maintenance work is performed in Japanese plants. • It is expected that the improvement of inspection way and utility’s ALARA activity will promote to decrease the exposure in Japanese plants.

  22. Thank you for your attention !!

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