Inadvertent damage of a Se-75 source


Print View Posted on: 23 December 2016

Event Date: 12 December 2016 Event Type: Radiation Source
Event Location: Germany, Düsseldorf region INES Rating: 2 (Final)

On December the 12th, 2016, a Se-75 source was inadvertently damaged during re-pair work on faulty radiography equipment. The work was performed in Düsseldorf region in North Rhine-Westphalia by a specialized company within a controlled area. The source contained about 1.3 Terabecquerel Se-75. The radioactive substance was released during the repair work and contaminated persons and zones within and out-side of the controlled area. Besides the two workers performing the repair work, other persons were also contaminated. The contamination was spread to pathways outside of the building, but within the site, clothings and private cars. In total more than 80 persons have been tested for intake of Se-75. Committed effective doses greater than 1 mSv were measured for three workers; the maximum dose was well beneath the allowed annual doses limit for workers of 20 mSv (between 1 and 3 mSv). The maximum doses for persons of the general public were in three instances slightly above the yearly dose limit of 1 mSv as specified in the German radiation protection ordinance, in 6 further instances the doses were slightly below 1 mSv. The event was rated INES level 2 because of the accidental release of radioactive substances.

INES Rating: 2 - Incident (Final) as per 23 December 2016
Release beyond authorized limits? Yes
Overexposure of a member of the public? Yes
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 Yes

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

Michael Maqua
Gesellschaft für Anlagen und Reaktorsicherheit

[email protected]
http://www.grs.de
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