OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2006
22
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) 2007 ISOE Asian ALARA Symposium
description
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. - PowerPoint PPT Presentation
Transcript of OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2006
OCCUPATIONAL EXPOSURE at JAPANESE NUCLEAR POWER PLANTS in 2006
September 12-14, 2007, Seoul, KoreaYoshihisa Hayashida
Safety Information DivisionJapan Nuclear Energy Safety Organization (JNES)
2007 ISOE Asian ALARA Symposium
Nuclear Power Plants in Japan
BWR PWR Total
In Operation
No. of Units 32 23 55
Output (MWe) 30,101 19,366 49,467
Under Construction
No. of Units 1 1 2
Output (MWe) 1,373 912 2,285
On Planning
No. of Units 9 2 11
Output (MWe) 11,869 3,076 14,945
as of March 31, 2007
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)
(FBR))(
敦賀
志賀
出力規模
50万kW未満 100万kW未満 100万kW以上 合計 53基 出力47,122MWe
7 8
TEPCO 21
55
(FBR))(22
7 8
TEPCO 21
555
Oma
Tomari
Higashi DoriOnagawa
Tokai No. 2
Hamaoka
IkataSendai
Genkai
Shimane
Kaminoseki
Takahama
Oi
Mihama
Tsuruga
Tokai
Fugen(on a decommissioning stage since 2003)
Monju
Shika
Higashi Dori
Fukushima Daiichi
Fukushima Daini
(On the decommissioning stage since 1998)
Namie-Odaka
Kashiwazaki-kariwa
３３
Output scale
In operationUnder Construction
On planning stageLess than
1,000,000kW 1,000,000kW
Total 55 Units 49,467MWe
(PWR 23 units, BWR 32 units )500,000kW
Less than More than
Nuclear Power Plants in Japan
Trend of Capacity Factor in Japanese plants
Individual Dose in Fiscal Year 2006 (April 2006 – March 2007)
Plants Units Persons mSv/person
BWR 32 44,129 1.0
PWR 23 22,718 1.1
GCR 1 1,293 0.02
Total 56 66,895 1.0
Trend of Individual Average Dose in Japanese plants
0
1
2
3
4
5
'87 '88 '89 '90 '91 '92 '93 '94 '95 '96 '97 '98 '99 '00 '01 '02 '03 '04 '05 '06
Fiscal Year
mSv/
pers
on
0
50
100
150
200
250
300
350
Individual Average Dose
No. of Woker exceeding 20mSv/y
Per
son
Collective Dose in Fiscal Year 2006 (April 2006 – March 2007)
Plants Units Person-Sv Person-Sv/unit
BWR 32 42.43 1.33
PWR 23 24.97 1.09
GCR 1 0.03 0.03
Total 56 67.43 1.23(LWR)
Trend of BWR Average Collective Dose per Reactor in Japanese Plants
0
1
2
3
4
5
'90 '91 '92 '93 '94 '95 '96 '97 '98 '99 '00 '01 '02 '03 '04 '05 '06
Fiscal Year
Exp
osur
e, p
erso
n-Sv/
unit
0102030405060708090100
Exposure Capacity Factor
(%)
Cap
acity
Fac
tor
Trend of PWR Average Collective Dose per Reactor in Japanese Plants
0
1
2
3
4
5
'90 '91 '92 '93 '94 '95 '96 '97 '98 '99 '00 '01 '02 '03 '04 '05 '06
Fiscal Year
Exp
sure
, Per
son-
Sv/
unit
0
10
20
30
40
50
60
70
80
90
100Exposure Capacity Factor
(%)
Cap
acity
Fac
tor
Trend of Maintenance Exposure at Japanese BWRs
Plant NameOnagawa-1Onagawa-2Onagawa-3HigashidoriFukushima No.1-1 1.33Fukushima No.1-2Fukushima No.1-3 1.65Fukushima No.1-4 1.94Fukushima No.1-5Fukushima No.1-6 0.8Fukushima No.2-1Fukushima No.2-2Fukushima No.2-3Fukushima No.2-4 0.6Kashiwazaki・K-1Kashiwazaki・K-2Kashiwazaki・K-3Kashiwazaki・K-4 0.5 0.58Kashiwazaki・K-5 0.64Kashiwazaki・K-6Kashiwazaki・K-7Hamaoka-1Hamaoka-2Hamaoka-3Hamaoka-4 1.12Hamaoka-5Shika-1Shika-2Shimane-1 0.98Shimane-2 0.4 0.49Tokai No.2Tsuruga-1
< 1.5 man.Sv1.5 - 3.0 man.Sv3.0 - 4.5 man.Sv> 4.5 man.Sv
2.221.18
7.94
2.97
4.1
1.42.1 3.7 5.94
2.2 3.51 7.33 1.12.98
0.5 0.7 0.3
0.9 1.1 3.03
2.431.1 9.92 0.9
1.8
0.9 1.6 1.8
0.8 2.41.1 2.0
0.7 4.31
2.59
1.99.23
4.98 5.083.89 2.5 1.5 1.93
2.7 2.4 2.980.2 0.3 0.4 1.3
2.990.8
0.640.3 0.3 0.3 1.2
0.9 2.16 0.7 1.2
0.8 1.7 0.95 1.70.3 0.5 2.0 1.75
1.9 5.611.68 0.6
1.20.8 1.91 0.48 4.07
1.67 0.7 0.61.0 1.2
0.9 1.4 0.61.2 0.8 1.8
1.4 1.79
0.76
1.7 1.1 2.981.3 3.19
0.8 3.65
1.9 0.8 2.05 0.6
1.4FY 2002FY 1996 FY 1997 FY 1998
4.13FY 2003FY 2001FY 1999 FY 2000
0.95 1.420.8 0.7 0.6
0.2 0.3 0.4 0.5
16.9 5.42.81
8.57 2.7 10.82.0 15.5 1.1
1.62.6 6.34 1.6 5.9
3.6 2.4 2.84.94 2.0 12.72
4.4 7.195.63
3.71
FY 2005
0.62
4.43
FY 2004
0.2 0.3
1.07
0.32
FY 2006
0.61
11.159.43
5.018.71
1.5
1.3
1.471.97
1.07
3.57
1.42.21 3.0
2.9
5.561.47
3.36
1.55
1.1
4.09
5.56
0.91
0.81
0.782.27
1.11.2
0.2
0.59
4.7
0.56
1.48
1.31
3.7
1.85
0.8
3.31
Trend of Maintenance Exposure at Japanese PWRs
nameTomari-1 0.6Tomari-2Mihama-1 0.98Mihama-2 0.41Mihama-3 1.31Takahama-1Takahama-2 1.18 1.29 0.84Takahama-3Takahama-4 0.79 1.52Ohi-1Ohi-2Ohi-3 0.74 1.66 0.99Ohi-4Ikata-1Ikata-2 0.68Ikata-3 0.71Genkai-1Genkai-2Genkai-3Genkai-4 1.12Sendai-1Sendai-2 1.05Truruga-2
< 1 man.Sv1 - 2 man.Sv2 - 3 man.Sv> 3 man.Sv
3.580.68 1.68 0.86 1.29
1.621.29
0.94 0.84
2.2 1.692.661.15 1.26 0.92
0.58 0.821.0 1.48 1.0
0.53 0.46 0.57 0.71.2
0.62 0.7 0.59 0.88
1.95 1.75 1.724.94 4.42 1.92 1.60 1.5 1.72
3.4 3.52 3.78 2.41
1.07 0.811.71.2 1.43 1.03 1.05
1.28 1.16 0.851.191.28 1.43 0.97
1.29 2.35 1.22 1.95
1.08 1.86 1.09
0.752.54 1.08 1.31 1.33 0.71
2.431.7 1.39 1.02 2.59 0.541.71 1.61 2.01 1.44
FY 2001FY 1999 FY 2002FY 1996 FY 1997 FY 1998
0.46
FY 2003 FY 20040.59 0.46 0.54 0.53 0.74 0.83
FY 2000
0.51 0.590.4 0.38 0.52 0.57
0.870.68 1.3
1.32 1.390.3 0.3 0.53
1.76
0.45
1.37 1.561.69
0.431.67 2.09
0.56 0.42 0.61 1.05
FY 2006
0.61 0.58 1.31 1.29
1.2 0.861.22 1.66
0.8
1.33 1.59 2.081.22 0.89
1.14 1.00 0.95 1.151.12 1.12 1.22 1.961.76
FY 20050.45
0.50.78
2.281.1
2.920.56
1.111.38
0.850.711.39
1.41
2.3
1.22
1.22
0.67
1.1
0.980.86
2.12.19
1.68
0.59
1.07
2.8
0.62
0.88
1.220.55
1.381.13
Collective Dose During Outage vs. Year of Commercial Operation Started
(BWR: 1996 - 2006)
0
2
4
6
8
10
12
14
16
18
1965 1970 1975 1980 1985 1990 1995 2000 2005
Fiscal Year of Commercial Operation Started
Per
son.
Sv/
Out
age
BWR3 & BWR2BWR4BWR5ABWR
Collective Dose During Outage vs. Year of Commercial Operation Started
(PWR: 1996 - 2006)
0
1
2
3
4
5
6
1965 1970 1975 1980 1985 1990 1995 2000 2005Fiscal Year of Commercial Operation Started
Per
son.
Sv/
Out
age
2 LOOP3 LOOP4 LOOP
BWR Average Collective Dose per Reactor by Country
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
95 96 97 98 99 00 01 02 03 04 05 06Fiscal Year
Pers
on-Sv/
unit J APAN
USA
GERMANY
SWEDEN
FINLAND
SWITZERLAND
PWR Average Collective Dose per Reactorby Country
0
0.5
1
1.5
2
2.5
95 96 97 98 99 00 01 02 03 04 05 06Fiscal Year
Per
son-
Sv/
unit
J APAN
USA
GEAMANY
FRANCE
BELGIUM
KOREA
BWR Three Year Rolling Average by Plant in USA and Japan
0
0.5
1
1.5
2
2.5
3
3.5
4
USA
J apan
Per
son-
Sv/
Uni
t
Ona
gaw
a
Kas
hiw
azak
ikar
iw a
Ham
aoka
Fuku
shim
adai
n
Shi
man
Shi
ka
From 2003 to 2005
From FY2004 to FY2006
MIN :0.81MAX:3.66
MIN:0.81MAX:3.66
Tsu
ruga
Tok
aida
ini
Hig
ashi
dori
Fuku
shim
adai
icni
PWR Three Year Rolling Average by Plant in USA and Japan
0
0.5
1
1.5
2
2.5
USAJ apan
From 2003 to 2005
Per
son-
Sv/
Uni
t
MIN:0.51MAX:1.84
MIN:0.43MAX:2.1
From FY2004 to FY2006
Mih
ama
Tom
ari
Gen
kai
Ohi
Tur
uga
Tsu
ruga
Sen
daIk
ata
Dose Rate at PLR Piping in Japanese BWR and US BWR
00.20.40.60.8
11.21.41.61.8
1 2 3 4 5 6 7 8 9Outage Number
mSv/
h
US Plant(Fermi-2)J apan(Hamaoka-3)
<0.5
0.5-
1.0
1.0-
1.5
1.5-
2.0
2.0-
2.5
2.5-
3.0
3.0-
3.5
3.5-
4.0
>4.0
J apan
02468
10
12
J apanUSA
Japan:2000.12-2003USA :2005.1
Median:0.89 mSv/h
mSv/h at PLR Piping
Num
ber of plants
Median:1.55 mSv/h
Operation Period and Maintenance Period by Country from 1996 to 2005
0
20
40
60
80
100
120
140
0 100 200 300 400 500 600 700
Operating period (days)
Out
age
(day
s)
USA
Finland
Korea
J apan
Switzerland
Belgium
Capacity Factor ９０％
Capacity Factor ８０％
Further Exposure reduction
Japanese utilities are continuing the approach for further exposure reduction.
Regulatory side will encourages and support their activity.
The effort of the improvement on inspection way for nuclear facilities is continued in Japan.
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.
Thank you for your attention !!
