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Individual and collective radiation doses due to accidental releases in fission and fusion reactors have been calculated with the computer code GENII. Evaluations of model reliability in the GENII code were performed comparing dose estimations for chronic and accidental releases in air and in water. Good agreement was found between GENII and VADOSCA dose estimations for chronic releases, and some differences were found in atmospheric dispersion models, due principally to different rise plume modelisation, which is based in GENII on initial momentum and buoyancy force. For dose assessment of accidental releases the model intercomparison was also performed. GENII dose estimations have been compared with VADOSCA and COSYMA dose calculations, obtaining excellent results. As an application, dose assessments were performed for accidental releases in a proposed fusion machine, eg. ITER, and comparisons were made with similar ones for the IGNITOR fusion device. Evaluations have been made changing the exposure scenario to estimate early dose and the maximum dose for the most conservative assumptions, and calculations for different release scenarios show the influence of parameters such as stack height, atmospheric conditions and distance from the release point.

Additional information

Bibliographic Reference: EUR 14989 EN (1993) 22 pp., FS, free of charge
Availability: Available from Joint Research Centre, Publication Department, I-21020 Ispra (Va.) (IT)
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