SEDL / STP / STP1228-EB / STP15138S

Gamma-Ray Dose Mapping in Operational CANDU Reactor Containment Areas Using MOS Dosimeters

Mackay, G
Research Engineer, Thomson and Nielsen Electronics Ltd., Ottawa, ONT.

Thomson, I
President and research scientist, Thomson and Nielsen Electronics Ltd., Ottawa, ONT.

Hirning, CR
Health Physicist, Ontario Hydro, Pickering, ONT.

Zeya, M
Nuclear Design Engineering Specialist, Ontario Hydro, ONT.

Pages: 6    Published: Jan 1994

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Abstract

It is important to determine the radiation dose received by key operational equipment in the containment areas of CANDU reactors. A dosimetry system was developed to evaluate the radiation environment under operational conditions. The key component in the system is a passive MOS (semiconductor) dosimeter which is hermetically sealed and is not affected by the high humidity in the containment area. Doses were measured in a number of Ontario Hydro operating reactor sites over periods of 4 000 to 11 000 hours. As a result of this dose mapping study, several remedial actions have taken place and it is recommended that similar reactors undergo this type of study.