Leakage of Contaminated Water from a Desalination System


Print View Posted on: 24 December 2015

Event Date: 09 October 2013 Event Type: Power Reactor
Event Location: Japan, FUKUSHIMA-DAIICHI INES Rating: Not Applicable (Final)

Approximately 11 m3 amount of water leakage occurred from a pipe joint of desalination system (reverse osmosis membrane, RO-3) inside the temporary warehouse on 9 October, 2013.
The water has retained in the dike installed in the warehouse. The radioactivity concentration of the leakage water was 34kBq/cm3 by total beta nuclides.
Out of eleven workers who were working in the warehouse, six workers had radioactive material on their bodies, and five workers had no radioactive material on their bodies. The maximum effective doses of the workers were 0.48 mSv (by gamma radiation) and 1.2 mSv (by beta radiation) .

INES Rating: Not applicable (Final) as per 16 April 2015
Release beyond authorized limits? No
Overexposure of a member of the public? No
Overexposure of a worker? No

Contamination spread within the facility? Yes
Damage to radiological barriers (incl. fuel damage) within the facility? No

Degradation of Defence In-Depth No

Person injured physically or casualty? No
Is there a continuing problem? No

Hiromitsu Yoneyama - Nuclear Regulation Authority
Nuclear Regulation Authority

hiromitsu_yoneyama@nsr.go.jp
http://www.nsr.go.jp/english/index.html
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