Thermochemical data acquisition

Thermochemical data have been determined for a number of fission product and reactor materials' compounds. Critical assessments have also been made of the available thermochemical data on a number of systems. These data complement the results from similar studies conducted in 1990, and can be used in the appropriate computer codes for calculations of the speciation and transport properties of the fission products during a severe reactor accident. Experimental studies have focussed on the vaporization of tellurium dioxide, caesium ruthenate, strontium and barium borate, indium hydroxide, caesium tellurides, caesium phosphate, caesium hydroxide and caesium iodate and on the thermodynamic properties of the condensed phases CdI2, Cs2CdI4, Cs2Si4O9, Cs2ZrO3, SrB4O7, Ba3B2O6. Critical evaluations have been made of a number of tellurides of importance in severe accident assessments, and analyses have been made of the Fe-Te, Ni-Te and Cr-Te systems. Tables of thermodynamic properties over the temperature range 298.15 K to 3000 K are given. The data should enable the fission product species stabilized in the event of a severe accident and their transport to be predicted with greater confidence. (author). 136 refs.; 18 figs.; 41 tabs