Leakage of Contaminated Water from a Flange of Water Pressure Measuring instrument


Print View Posted on: 24 December 2015

Event Date: 06 February 2014 Event Type: Power Reactor
Event Location: Japan, FUKUSHIMA-DAIICHI INES Rating: Not Applicable (Final)

On 6 February,2014, TEPCO found that the water treated by Simplified Active Water Retrieve and Recovery System (SARRY, cesium removal facility) and Reverse Osmosis Desalination Facility (RO) was leaking from the flange of water pressure measuring instrument equipped to the water pipe in which the water was running to the reactors unit 1 to 3 for their cooling.
The leaked water was flowing into the underground nearly under the water pressure measuring instrument.
The water leakage from the flange was stopped by means of closing the valve attached between the flange and the water pipe.
The amount of leaked water was estimated to be approximately 600 litters in total.
The concentration of radioactive materials in the water treated by SARRY and RO was approximately as follows:
Total Beta: 93 kBq/L
H-3: 380kBq/L
There has been no contamination of the ocean that raises any concern about influence to health and the environment.

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? Yes

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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