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The present status of iodine chemistry research in Canada and its application to reactor safety analysis

Abstract

The current need to understand iodine chemistry in a reactor safety context has become more sharply focussed as the level of that understanding has advanced. At the same time, the situations of most concern within containment, from an iodine perspective, are also being redefined in the light of that understanding. The present paper summarises these developments. Over the past five years, considerable advances have occurred in our understanding of iodine chemistry under conditions of interest in reactor accidents. A number of key experiments have yielded important results in the areas of solution chemistry, the role of surfaces, the importance of organics and the effects of impurities. This understanding supplements the already substantial gains made in characterising the key roles of pH and the effects of radiation. All these factors underline the now evident fact that the kinetics of iodine are the controlling factor when radiation is involved, and that a number of reactive species, not present in thermal reactions, effectively control the observed volatility of iodine. In this paper, recent advances are summarised and the present status of our understanding of iodine chemistry is reviewed. Specifically, an attempt is made to identify those areas where our understanding appears to be  More>>
Authors:
Weaver, K R; [1]  Kupferschmid, W C.H.; Wren, J C; Ball, J M [2] 
  1. Ontario Hydro Nuclear, Toronto (Canada)
  2. Atomic Energy of Canada Ltd., Pinawa, MB (Canada). Whiteshell Labs.
Publication Date:
Dec 01, 1996
Product Type:
Technical Report
Report Number:
PSI-97-02; CONF-9606320-; NEA/CSNI/R(96)-6.
Reference Number:
SCA: 560101; 220502; PA: AIX-28:036807; EDB-97:082410; SN: 97001795691
Resource Relation:
Conference: 4. CSNI workshop on the chemistry of iodine in reactor safety, Wuerenlingen (Switzerland), 10-12 Jun 1996; Other Information: PBD: Dec 1996; Related Information: Is Part Of Proceedings of the 4. CSNI workshop on the chemistry of iodine in reactor safety; Guentay, S. [ed.] [Paul Scherrer Inst. (PSI), Villigen (Switzerland)]; PB: 716 p.
Subject:
56 BIOLOGY AND MEDICINE, APPLIED STUDIES; 22 NUCLEAR REACTOR TECHNOLOGY; CANADA; RESEARCH PROGRAMS; IODINE; CHEMISTRY; COMPUTERIZED SIMULATION; EXPERIMENTAL DATA; PH VALUE; RADIATION PROTECTION; RADIOLYSIS; REACTOR ACCIDENTS; REACTOR SAFETY; THEORETICAL DATA; WATER
OSTI ID:
481461
Research Organizations:
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE97624048; TRN: CH9700195036807
Availability:
INIS; OSTI as DE97624048
Submitting Site:
CHN
Size:
pp. 29-39
Announcement Date:

Citation Formats

Weaver, K R, Kupferschmid, W C.H., Wren, J C, and Ball, J M. The present status of iodine chemistry research in Canada and its application to reactor safety analysis. Switzerland: N. p., 1996. Web.
Weaver, K R, Kupferschmid, W C.H., Wren, J C, & Ball, J M. The present status of iodine chemistry research in Canada and its application to reactor safety analysis. Switzerland.
Weaver, K R, Kupferschmid, W C.H., Wren, J C, and Ball, J M. 1996. "The present status of iodine chemistry research in Canada and its application to reactor safety analysis." Switzerland.
@misc{etde_481461,
title = {The present status of iodine chemistry research in Canada and its application to reactor safety analysis}
author = {Weaver, K R, Kupferschmid, W C.H., Wren, J C, and Ball, J M}
abstractNote = {The current need to understand iodine chemistry in a reactor safety context has become more sharply focussed as the level of that understanding has advanced. At the same time, the situations of most concern within containment, from an iodine perspective, are also being redefined in the light of that understanding. The present paper summarises these developments. Over the past five years, considerable advances have occurred in our understanding of iodine chemistry under conditions of interest in reactor accidents. A number of key experiments have yielded important results in the areas of solution chemistry, the role of surfaces, the importance of organics and the effects of impurities. This understanding supplements the already substantial gains made in characterising the key roles of pH and the effects of radiation. All these factors underline the now evident fact that the kinetics of iodine are the controlling factor when radiation is involved, and that a number of reactive species, not present in thermal reactions, effectively control the observed volatility of iodine. In this paper, recent advances are summarised and the present status of our understanding of iodine chemistry is reviewed. Specifically, an attempt is made to identify those areas where our understanding appears to be relatively complete, and to flag the remaining critical areas where our attention is currently focussed. The state of our modelling capability is reviewed, as is the significance or related areas such as the role of mass transfer. Finally, an overview is presented of the significance of this work for reactor safety, and our expectations for its application over the near term future. (author) 2 figs., 12 refs.}
place = {Switzerland}
year = {1996}
month = {Dec}
}