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Occupational Exposure at Japanese Nuclear Power Plants

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Presentation on theme: "Occupational Exposure at Japanese Nuclear Power Plants"— Presentation transcript:

1 Occupational Exposure at Japanese Nuclear Power Plants
2012 ISOE Asian ALARA Symposium September , 2012, JNES, Tokyo Japan Yoshihisa HAYASHIDA Japan Nuclear Energy Safety Organization (JNES)

2 Nuclear Power Plants in Japan
as of March 31, 2012

3 Nuclear Power Plants in Japan
55 Units in Operation (PWR 23, BWR 32) as of March 31, 2006 女川 福島第一 ふげん (2003 年より廃止措置準備中 ) 敦賀 志賀 出力規模 50 万 kW 未満 100 以上 合計 53 基 出力 47,122MWe 7 8 TEPCO 1 5 2 Higashi Dori Oma Tomari Onagawa Tokai No. 2 Ikata Sendai Genkai Shimane Kaminoseki Takahama Ohi Mihama Tsuruga Tokai (on a decommissioning stage since 2003) Fugen Shika Fukushima Daiichi (On the decommissioning stage since 1998) Namie-Odaka Kashiwazaki-kariwa 3 Output scale In operation Under Construction On planning stage Less than 1,000,000kW Total Units 46,148MWe (PWR 24 units, BWR 26 units ) 500,000kW More than Fukushima Daini Hamaoka (Unit 1,2　On the decommissioning stage since 2009) 6 (Unit 1,2,3,4: On the decommissioning stage )

4 Average Individual Dose in Fiscal Year 2011 (April 2011 – March 2012)
Plants Units Persons mSv/person BWR 221 33,519 0.69 PWR 24 28,183 0.82 LWR (BWR+PWR) 46 61,702 0.75 1. Includes Hamaoka 1 & 2 under decommissioning, and dose not include Fukushima Daiichi (6 BWR)and Fukushima Daini (4 BWR)

5 Trend of Average Individual Dose

6 Collective Dose in Fiscal Year 2011 (April 2011 – March 2012)
Plants Units Person-Sv Person-Sv/Unit BWR 221 23.17 1.05 PWR 24 23.12 0.96 LWR (BWR+PWR) 46 46.29 1.01 1. Includes Hamaoka 1 & 2 under decommissioning, and dose not include Fukushima Daiichi (6 BWR)and Fukushima Daini (4 BWR)

7 Trend of Average Collective Dose per Reactor and Capacity Factor

8 Trend of Capacity Factor by Month (January 2011 – August 2012)

9 BWR Average Collective Dose per Reactor by Country(1980-2011)
*) Dose data exclude Fukushima Daiichi for FY 2010, and Fukushima Daiichi and Fukushima Daini for FY 2011.

10 PWR Average Collective Dose per Reactor by Country(1980-2011)

11 Average Collective Dose by Site (BWR)

12 Average Collective Dose by Site (PWR)

13 Contribution of outage collective dose to annual collective dose (5-year average)

14 Comparison of outage collective dose between conventional type and improved type (LWR)
Conventional type: Plant before 1982 Improved type: Plant after 1983 Average Collective Dose

15 Comparison of outage collective dose between conventional type and improved type (BWR)
Conventional type: Plant before 1982 Improved type: Plant after 1983 Average Collective Dose

16 Comparison of outage collective dose between conventional type and improved type (PWR)
Conventional type: Plant before 1982 Improved type: Plant after 1983 Average Collective Dose

17 Correlation between Elapsed time after commencement of commercial operation and Exposure per outage (Japanese BWR)

18 Correlation between Elapsed time after commencement of commercial operation and Exposure per outage (Japanese PWR)

19 Thank you for your attention !!

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