Design Considerations for PHWR Decontamination
Operation of early CANDU-PHW* reactors resulted in radiation fields around out-of-core heat transport system components and equipment which were higher than originally anticipatedl. As a result of the accompanying increases in radiation exposures of maintainers and operators an intensive collaborative research and development program between scientists and engineers from Atomic Energy of Canada Limited (AECL) and Ontario Hydro (OH) was undertaken to identify the mechanisms of activity production, transportation and deposition and to recommend methods to reduce ambient radiation fields around the complete nuclear steam supply system. The objective being to reduce the radiation fields to levels that permit station staff to perform all operating and maintenance functions, without the necessity of additional staff. In addition all radiation exposures should be kept as low as reasonable achievable (ALARA).
KeywordsCorrosion Product Heavy Water Spend Resin Ontario Hydro Permanent Connection
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