Community Research and Development Information Service - CORDIS


Six EC countries were involved in analytical experiments to clarify the phenomenology and to increase confidence in the modelling of iodine behaviour in containment. The project focused on understanding and quantifying the effects of silver on iodine behaviour, providing new experimental data, which have been used to validate and improve the existing models and to stimulate code development.

In summary, this programme has provided extensive experimental kinetic data on the reaction of aqueous iodine with silver surfaces. Experiments have shown that the volatility of iodine from irradiated iodide solutions is greatly reduced in the presence of excess silver, and that this 'can be understood in terms of the thermal reactions of I(2) with the silver surface. Moreover, the AgI product appears stable to irradiation at the dose rates studied.

The source term evaluation has shown that this reaction has significant potential to reduce the formation of volatile iodine under some severe reactor accident conditions. The effect of this reduction on the predicted release of iodine to the environment depends strongly on the sequence being considered. The presence of silver has the greatest potential impact under conditions of low pool pH and high Ag/I ratio. io.

Additional information

Authors: DICKENSON ET AL, AEA Technology (UK);BELVAL-HALTIER ET AL, IPSN, Cadarache (FR);FUNKE F, Seimens (DE);DROSSINOS ET AL, JRC/ISIS, Ispra (ES);HERRERO B, Instituto de Technologia, Madrid (ES);ROUTAMO T, Fortum Engineering Ltd, (FI);GRINDON ET AL, NCC Ltd, Cheshire, (UK)
Bibliographic Reference: Article: OECD Workshop of Iodine Aspects of Severe Accident Management, May, 18-20, pp 209-222
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