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  • Development of a kinetic model, including rate constant estimations, on iodine and caesium behaviour in the primary circuit of LWR's under accident conditions


In this report a kinetic model has been developed with the aim of trying to reproduce the chemical phenomena that take place in a flowing system containing steam, hydrogen and iodine and caesium vapours. The work is divided into two different parts. The first part consists of the estimation, through the Activated Complex Theory, of the reaction rate constants for the chosen reactions, and the development of the kinetic model based on the concept of the ideal tubular chemical reactor. The second part deals with the application of such a model to several cases taken from Phase B (Scoping Calculations) of the Phebus-FP Project (sequence AB) and the SFD-ST and SFD1.1 experiments. The main conclusion obtained is that the assumption of instantaneous equilibrium could be inaccurate in estimating the iodine and caesium species distribution under severe accident conditions.

Additional information

Authors: ALONSO A, Universidad Politecnica de Madrid (ES);BURON J M, Universidad Politecnica de Madrid (ES);FERNANDEZ S, Universidad Politecnica de Madrid (ES)
Bibliographic Reference: EUR 13790 EN (1991) 88 pp., FS, ECU 7.50
Availability: (2)
ISBN: ISBN 92-826-2858-2
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