Community Research and Development Information Service - CORDIS


In the event of a light water reactor (LWR) severe accident the radionuclide iodine released is of great importance due to its complex chemical behaviour. Iodine can be present in many different chemical forms in the containment. These can be divided into two groups: volatile iodine and nonvolatile iodine or nonsoluble silver iodide. The knowledge of the fraction of iodine in the gas phase of a containment is essential in order to assess the radiological consequences for the environment.

Codes have been developed to model the kinetics of the chemical reactions, such as INSPECT (Great Britain), IODE (France), IMPAIR (Switzerland), LIRIC (Canada) and TRENDS (USA). These have all been employed to describe results from iodine experiments. Generally, the results show great differences in predicting concentrations of iodine species with time. This report assesses these differences and indicates the further work necessary to produce more accurate calculations. .

Additional information

Authors: SIMS H ET AL, AEA Harwell (GB);HUEBER C, CEA Cadarache (FR);FUNKE F ET AL, Siemens AG, Erlangen (DE)
Bibliographic Reference: EUR 16507 EN (1995) 113pp., FS
Availability: Available from the European Commission, Mr G Cottone, DG XII-F-5, 200 rue de la Loi, B-1049 Bruxelles (BE)
ISBN: ISBN 92-827-4895-2
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