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Tokai JCO Criticality Accident

Report [40] 27 March 2001

See here

Exposure Dose According to STA's Report Released on 13 October, 2000

Description of the exposed people

number

Dose

Nuclear-related employees

172

 

JCO employees directly involved in the process leading to the accident (measured)

3

16-20 GyEq (Mr. Ouchi, died on 21 December 1999)

6.0-10 GyEq (Mr. Shinohara, died on 27 April 2000)

1-4.5 GyEq (Mr. Yokokawa, left hospital on 20 Dec. 1999)

Employees involved in containing criticality (extraction of coolant etc.)

18

3.8-48 mSv

Employees involved in containing criticality (ones who poured borate water)

6

0.7-3.5 mSv

Others at the site at the time of the accident

(measured)

49

0.6-48 mSv

(estimated)

96

0.06-17 mSv

Accident response task-force members

260

 

Employees of government associated Japan Atomic Energy Research Institute and Japan Nuclear Cycle Development Institute (measured)

56

0.1-9.2 mSv

Fire fighters involved in the rescuing of the three JCO employees

3

4.6-9.4 mSv

Officials of local governments

167

0.0002-7.2 mSv

Officials of the central government

8

0.49-2.1 mSv

Media

26

0.014-2.6 mSv

Citizens in the locality at the time of the accident

235

 

Local residents (measured)

7

6.7-16 mSv

Residents and area employees (estimated)

200

0.01-21 mSv

Temporary transients (estimated)

28

0.01-3.8 mSv

TOTAL

667

 


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