Book excerpt: This volume presents a collection of critically assessed data on inorganic compounds which are of special interest in nuclear reactor safety studies. Thermodynamic equilibrium calculations are an important and widely used instrument in the understanding of the chemical behaviour and release of fission products in the course of nuclear reactor accidents. The reliability of such calculations is, nevertheless, limited by the availability of accurate input data for relevant compounds. The present work examines a wide variety of elements and compounds (oxides, hydroxides, actinides, iodides, tellurides, alloys, and ternary oxides) relevant to light water and fast nuclear reactors, in their condensed and gaseous state, many of which have been evaluated here for the first time. Recommended values, obtained from a critical evaluation of the literature, are given in an extensive explanatory text, and compiled in thermochemical tables from 298 to 3000 K. Special attention is also given to the crystallographic properties of the condensed phases.