TY - CONF TI - Mechanism of the rapid dissolution of PuO{sub 2} under oxidizing conditions and applications AB - Until the recent years, plutonium dioxide was known to be among the metallic oxides the most difficult to dissolve. From thermodynamic calculations it can be predicted that PuO{sub 2} will dissolve under oxidizing conditions. This can be achieved using Ag(II) species possibly regenerated by electrochemical means. The mechanism of such a process has been elucidated using carbon paste electrochemistry and {sup 18}O labelling. These studies demonstrate that the chemical reaction limiting the overall proces is located on the surface of the solid PuO{sub 2}, and that the first step consists in the oxidation of the plutonium into Pu(V) species. Applications of the dissolution process of PuO{sub 2} by electrogenerated Ag(II) were growing in the recent years in FRANCE. These applications developed often in collaboration with SGN and COGEMA, concern the treatment of: out of specifications PuO{sub 2}, incineration ashes, wastes produced during MOX fuel fabrication, and during the dismantling of old nuclear facilities. A general overview of these different applications is given. AU - "Madic, C" AU - "Lecomte, M" AU - "Bourges, J" AU - "Koehly, G [CEA Centre d`Etudes de la Vallee du Rhone, 30 - Marcoule (FR). Dept. des Procedes de Retraitement]" AU - "Moulin, J P [Societe Generale pour les Techniques Nouvelles (SGN), 78 - Saint-Quentin-en-Yvelines (FR)]" KW - "11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS" KW - "12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES" KW - "PLUTONIUM DIOXIDE" KW - "DISSOLUTION" KW - "ALPHA-BEARING WASTES" KW - "DECONTAMINATION" KW - "OXIDATION" KW - "SILVER" KW - "ELECTROCHEMISTRY" KW - "SOLID WASTES" KW - "050800" KW - "052001" KW - "SPENT FUELS REPROCESSING" KW - "WASTE PROCESSING" DO - https://doi.org/ UR - PB - CY - France PY - 1991 DA - 1992-12-31 LA - English J2 - [] VL - C1 - CEA Centre d`Etudes de la Vallee du Rhone, 30 - Marcoule (France). Dept. des Procedes de Retraitement C2 - C3 - CEA-CONF-10551; CONF-910413- C4 - C5 - OSTI; NTIS (US Sales Only) L3 - Conference: 3. international conference on nuclear fuel reprocessing and waste management,Sendai (Japan),14 Apr 1991; Other Information: PBD: 1991 ER -