Summary of the JCO criticality accident in Tokai-mura and a dose assessment

Tanaka, Shunichi

A criticality accident occured on September 30,1999, in a conversion facity at the JCO tokai site. The accident continued for about 19 hours before the criticality could be stopped, during which time neutrons and gamma-rays were emitted continuously due to fission reactions. The total number of fission reactions was 2.5x10 $^{18}$ . The accident gave radiation dose to 3 employees and fatal dose to 2 of them. The individual dose was estimated for 234 resident, 169 JCO employees and 260 emergency personnel, of which the maximum dose was 48 mSv.

Language	:	English
Journal	:	Journal of Radiation Research
Volume	:	42
Number	:	Suppl.
Pages	:	p.S1 - S9
Publication Year/Month	:	2002/00
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Keywords	:	JCO; Criticality; Accident; neutron; -ray; Dose; Emergency; Actions
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Registration No. : A20010121
JAEA Abstracts No. : 300528
Paper Submission No. : 19059

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