THERMOCHEMISTRY OF SELECTED FISSION-PRODUCT COMPOUNDS

Thermochemical data have been determined for a number of compounds of fission products and reactor materials. Critical assessments have also been made of the available thermochemical data on a number of systems . The studies have focused on the vaporization of iodides, such as ind ium iodide and cadmium iodide, and of ternary oxide compounds, such as caesium ruthenate, borate, molybdate and phosphate. The thermodynamic properties of condensed phases such as CdI2, Cs2CdI4, Cs2RuO4, Cs2Si4 O9 and Cs2ZrO3 have also been measured. The data enable the speciation of fission products and their transport in the event of a severe reac tor accident to be predicted with greater confidence.