Cesium and iodine, which are formed during a fission process in a nuclear reactor, are considered as major fission products responsible for environmental burden in the case of a nuclear accident. From safety point of view, it is thus important to understand its release mechanism when overheating of the reactor core occurs. This work presents an experimental investigation of the behaviour of caesium iodide and caesium fluoride in fluoride based molten salt reactor fuel during high temperature event. It has been demonstrated that CsF will be retained in the fuel salt and thus its volatility will be significantly reduced, while CsI will not dissolve in the fluoride-based fuel matrix and will thus remain more volatile. The influence of presence of CsI and CsF on melting behaviour was investigated using calorimetry, revealing negligible effects.
BENES Ondrej;
CAPELLI Elisa;
VOZAROVA Nikoleta;
COLLE Jean-Yves;
TOSOLIN Alberto;
WISS Thierry;
CREMER Bert;
KONINGS Rudy;
2021-06-07
ROYAL SOC CHEMISTRY
JRC121482
1463-9076 (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC121482,
10.1039/d0cp05794k (online),
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