Exposure of a worker in excess of statutory annual dose limits

Print View Posted on: 02 September 2010

Event Date: 31 August 2010 Event Type: Power Reactor
Event Location: Switzerland, LEIBSTADT INES Rating: 2 (Provisional)

On 31 August 2010 during the annual refuelling outage of the Leibstadt NPP, a diver was performing maintenance work in the fuel transfer pool within the fuel building. After completion of this work, he recovered an unidentified object and placed it into a transport basket. While the basket was lifted, before reaching the surface of the water, an alarm of the area radiation monitor was triggered. Therefore, the basket was lowered again.
As a result of the handling of the object, the diver received a hand dose of about 1,000 mSv which is twice the statutory limit of 500 mSv. The diver had worn dosimeters on different parts of the body.

INES Rating: 2 - Incident (Provisional) as per 31 August 2010
Release beyond authorized limits? No
Overexposure of a member of the public? No
Overexposure of a worker? Yes

Contamination spread within the facility? No
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

Peter Flury

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