Community Research and Development Information Service - CORDIS

Abstract

Fission product iodine released from the core of an LWR into the reactor building during a severe accident will become distributed between water pools, where it is largely immobilized, and the gas phase, from which it may readily escape to the environment. Iodine in aqueous solution can undergo a complex series of oxidation and reduction reactions involving many molecular species, only a few of which are capable of partitioning into the gas phase. This review is concerned with assessing the chemistry and partitioning behaviour of inorganic iodine relevant to severe LWR accidents. Iodine chemical behaviour in solution is sensitive to water chemistry conditions, particularly pH and temperature, and also to the presence of radiation fields. The likely conditions in the reactor building are first identified. A detailed analysis of the redox chemistry of iodine is then given, and pertinent equilibrium and kinetic data are reviewed with particular emphasis on data uncertainties. Sensitivity studies are performed of the dependence of the total partitioning of iodine on uncertainties in individual data, concentrating on temperatures >or= 100 degrees C, with a view to identifying key data on which improved experimental measurements appear to be needed. Finally, recommendations are made of priorities for future work on aqueous iodine chemistry.

Additional information

Authors: CLOUGH P N, SAFETY AND RELIABILITY DIRECTORATE, UKAEA, CULCHETH (UK);STARKIE H C SAFETY AND RELIABILITY DIRECTORATE, UKAEA, CULCHETH (UK), SAFETY AND RELIABILITY DIRECTORATE, UKAEA, CULCHETH (UK)
Bibliographic Reference: EUROPEAN APPLIED RESEARCH REPORTS - NUCLEAR SCIENCE AND TECHNOLOGY SECTION, VOL. 6 (1985), NO. 4, PP. 631-776, (EUR 9408 EN).
Availability: Can be ordered online
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top