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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

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)


Nuclear power plants in japan
Nuclear Power Plants in Japan

as of March 31, 2007


Nuclear power plants in japan1

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

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

出力

47,122MWe

(PWR 23 units, BWR 32 units )

Less than

More than

50

kW

未満

Less than

100

kW

100

kW

未満

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


Trend of capacity factor in japanese plants
Trend of Capacity Factor in Japanese plants


Individual dose in fiscal year 2006 april 2006 march 2007
Individual Dose in Fiscal Year 2006 (April 2006 – March 2007)



Collective dose in fiscal year 2006 april 2006 march 2007
Collective Dose in Fiscal Year 2006 (April 2006 – March 2007)




Trend of maintenance exposure at japanese bwrs
Trend of Maintenance Exposure Plants at Japanese BWRs


Trend of maintenance exposure at japanese pwrs
Trend of Maintenance Exposure Plants at Japanese PWRs


Collective dose during outage vs year of commercial operation started bwr 1996 2006
Collective Dose During Outage vs. PlantsYear of Commercial Operation Started (BWR: 1996 - 2006)


Collective dose during outage vs year of commercial operation started pwr 1996 2006
Collective Dose During Outage vs. PlantsYear of Commercial Operation Started (PWR: 1996 - 2006)






Dose rate at plr piping in japanese bwr and us bwr
Dose Rate at PLR Piping Plantsin Japanese BWR and US BWR



Further exposure reduction
Further Exposure reduction to 2005

  • 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.


Summary
Summary to 2005

  • 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.



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