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This report deals with the chemical behaviour of caesium and iodine in the primary circuit of LWRs, focussing particularly on kinetic chemical aspects. In the case of a postulated severe accident in a nuclear reactor, caesium and iodine fission products are among the major health hazards because of their high volatility and radiotoxicity. The extent of the release of such fission products to the environment depends on the effectiveness of transport through different structures in the reactor coolant system and within the reactor building. The release from fuel has been briefly studied: only those aspects concerning iodine and caesium chemical forms when released have been reviewed. Nevertheless, emphasis has been placed on the transport of such elements and their species through the primary system. Some thermochemical equilibrium studies, applied to primary circuit conditions in LWRs, have been analysed. Other phenomena affecting iodine and caesium transport, besides chemical reactions, such as interactions with surfaces, aerosols or other chemical species have also been examined, based on available information from diverse experiments.

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Authors: ALONSO A, Universidad Politecnica de Madrid (ES);FERNANDEZ S, Universidad Politecnica de Madrid (ES);BURON J M, Universidad Politecnica de Madrid (ES);LOPEZ J V, Universidad Politecnica de Madrid (ES)
Bibliographic Reference: EUR 13791 EN (1991) 86 pp., FS, ECU 7.50
Availability: (2)
ISBN: ISBN 92-826-2859-0
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