Thermodynamics of soluble fission products cesium and iodine in the Molten Salt Reactor

JOURNAL OF NUCLEAR MATERIALS

卷:501

Article

Capelli, E.^1,2  Benes, O.³  Konings, R. J. M.^1,3 

[1] Delft Univ Technol, Fac Appl Sci, Dept Radiat Sci & Technol, NL-2629 JB Delft, Netherlands

[2] Nucl Res & Consultancy Grp NRG, NL-1755 LE Petten, Netherlands

[3] European Commiss, Joint Res Ctr, D-76125 Karlsruhe, Germany

关键词: Molten Salt Reactor;    Phase diagrams;    Fission products;    Cesium;    Iodine;    Fluoride salts;   

DOI  :  10.1016/j.jnucmat.2018.01.024

来源: Elsevier

【 摘 要 】

The present study describes the full thermodynamic assessment of the Li, Cs,Th//F,I system. The existing database for the relevant fluoride salts considered as fuel for the Molten Salt Reactor (MSR) has been extended with two key fission products, cesium and iodine. A complete evaluation of all the common-ion binary and ternary sub-systems of the LiF-ThF4-CsF-LiI-ThI4-CsI system has been performed and the optimized parameters are presented in this work. New equilibrium data have been measured using Differential Scanning Calorimetry and were used to assess the reciprocal ternary systems and confirm the extrapolated phase diagrams. The developed database significantly contributes to the understanding of the behaviour of cesium and iodine in the MSR, which strongly depends on their concentration and chemical form. Cesium bonded with fluorine is well retained in the fuel mixture while in the form of CsI the solubility of these elements is very limited. Finally, the influence of CsI and CsF on the physicochemical properties of the fuel mixture was calculated as function of composition. (C) 2018 The Authors. Published by Elsevier B.V.

【 授权许可】

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