Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 140-147 |
| Journal | Nuclear Engineering and Design |
| Volume | 267 |
| DOIs | |
| Publication status | Published - 2014 |
| MoE publication type | A1 Journal article-refereed |
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Chemical reactions of fission product deposits and iodine transport in primary circuit conditions. / Kalilainen, Jarmo (Corresponding Author); Kärkelä, Teemu; Zilliacus, Riitta; Tapper, Unto; Auvinen, Ari; Jokiniemi, Jorma.
In: Nuclear Engineering and Design, Vol. 267, 2014, p. 140-147.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Chemical reactions of fission product deposits and iodine transport in primary circuit conditions
AU - Kalilainen, Jarmo
AU - Kärkelä, Teemu
AU - Zilliacus, Riitta
AU - Tapper, Unto
AU - Auvinen, Ari
AU - Jokiniemi, Jorma
PY - 2014
Y1 - 2014
N2 - The objective of this work was to examine the chemical reactions taking place on primary circuit surfaces and their effect on fission product transport in a severe nuclear reactor accident. Especially transport of gaseous and aerosol phase iodine was studied. Caesium iodide (CsI) was used as precursor material for iodine species. Also, effects of molybdenum and boron on transport of iodine were investigated. The experimental work showed that when CsI alone was used as a precursor, as much as 20% of the released iodine was in gaseous form and the rest as aerosol particles. Aerosol particles were most likely CsI. When the amount of hydrogen in the carrier gas was increased, the fraction of gaseous iodine decreased. When Boron was added to the precursor, a glassy caesium borate surface was formed on the crucible. Boron trapped most of the caesium and also a fraction of iodine, causing almost all released iodine to be in gaseous form. When Mo was introduced in the precursor, most of the iodine was again released in gaseous form. Oxidised Mo reacted with caesium releasing iodine from CsI. The effect of Mo on iodine transport depended much on H 2 concentration and was observed to be substantially greater on stainless steel surface. When stainless steel crucible was used, Mo was found in small amounts from aerosol particles, indicating that it was probably released as caesium molybdate or as molybdenum oxide
AB - The objective of this work was to examine the chemical reactions taking place on primary circuit surfaces and their effect on fission product transport in a severe nuclear reactor accident. Especially transport of gaseous and aerosol phase iodine was studied. Caesium iodide (CsI) was used as precursor material for iodine species. Also, effects of molybdenum and boron on transport of iodine were investigated. The experimental work showed that when CsI alone was used as a precursor, as much as 20% of the released iodine was in gaseous form and the rest as aerosol particles. Aerosol particles were most likely CsI. When the amount of hydrogen in the carrier gas was increased, the fraction of gaseous iodine decreased. When Boron was added to the precursor, a glassy caesium borate surface was formed on the crucible. Boron trapped most of the caesium and also a fraction of iodine, causing almost all released iodine to be in gaseous form. When Mo was introduced in the precursor, most of the iodine was again released in gaseous form. Oxidised Mo reacted with caesium releasing iodine from CsI. The effect of Mo on iodine transport depended much on H 2 concentration and was observed to be substantially greater on stainless steel surface. When stainless steel crucible was used, Mo was found in small amounts from aerosol particles, indicating that it was probably released as caesium molybdate or as molybdenum oxide
U2 - 10.1016/j.nucengdes.2013.11.078
DO - 10.1016/j.nucengdes.2013.11.078
M3 - Article
VL - 267
SP - 140
EP - 147
JO - Nuclear Engineering and Design
JF - Nuclear Engineering and Design
SN - 0029-5493
ER -