Denitration of radioactive liquid waste : proceedings of a seminar jointly organised by the Commission of the European Communities, Directorate-General for Science, Research and Development and the Kernforschungsanlage Jülich GmbH, in the framework of th

The purpose of the Seminar was to provide an international interdisciplinary forum for in-depth discussions on the pros and cons of a denitration step by chemical means in the course of solidification of MAW (medium active waste) and HAW (highly active waste), prior to feeding the calciner or melter. In particular, differences In the volatility of some components and aerosol formation during the vitrification step are of interest. Chemical rather than thermal denitration may have particular merits which could simplify off-gas purification. A reduction in the salt burden of waste solutions, leading to a reduction In the volume of solid waste, may also be achieved. The scientific programme of the Seminar consisted of invited lectures only, given by experts actively engaged in this field of research. The emphasis was on extensive discussions among the partiCipants, with the aim of leading to an objective understanding of the state-of-the-art. The meeting also indentified issues and options for future research. Front Matter....Pages i-viii Overview on the Application of Denitration in the Nuclear Field....Pages 1-10 Chemical Reactions Involved in the Denitration Process with HCOOH and HCHO....Pages 11-31 Alternative Organic Reductants for Denitration....Pages 32-46 Economical Aspects of Denitration in the Management of Reprocessing Concentrate....Pages 47-50 Safety Aspects about Denitration....Pages 51-57 Denitration of reprocessing concentrates by means of HCHO....Pages 58-85 Denitration of Reprocessing Concentrate by Means of HCOOH....Pages 86-96 Application of Denitration/Oxalate Precipitation in the Petra Hot-Cell Facility....Pages 97-111 Abatement of the NOx Evolved during Denitration of Reprocessing Concentrate....Pages 112-125 Denitration of HLLW for Actinide Partitioning....Pages 126-140 Operational Experience of the Denitration of Simulated Highly Active Liquid Wastes during Vitrification....Pages 141-151 Reduction of Ru and Tc Volatility during Vitrification of HLLW by Denitration....Pages 152-161 Industrial Application of Denitration of HLLW by Means of HCHO....Pages 162-171 Conclusions and Opinion of the Scientific Secretaries....Pages 172-176 Back Matter....Pages 177-180