Objetivo The overall objective of this three year project is to provide an extensive database on the chemical identities (speciation) and kinetics ,of release of fission products evolved from irradiated fuel during a variety of severe reactor accident conditions. This experimental work would be integrated with theoretical studies to improve modelling capabilities in this area. Approximately 20 experiments are proposed to examine the release of fission products and other reactor materials from highly-irradiated fuel heated under a range of atmospheres to temperatures up to 2400°C. Mass spectrometry would be used to quantify the release rates and chemical forms of the major fission products. This technique would be supported by gamma-ray spectroscopy and thermal gradient tube/aerosol analysis methods to provide additional data. The main variables of the experimental programme will be maximum temperature and rate of increase, pressure (from near-vacuum to 1 bar), oxygen potential (including steam, air and hydrogen - in particular a number of experiments will be conducted under oxidizing conditions where the database is limited), and the effects of fuel, cladding and other core materials. Further separate-effect experiments will also be conducted to establish the role of pressure (up to 35 bar) on the release and aerosol characteristics. These experiments will be integrated with developments of theoretical models in order to test and validate the fission product release codes. The work will enable the models for fission product release under oxidizing conditions, high pressures and from molten pools to be developed and tested. In this manner, the on-line results from the project can be compared with Phebus-FP data and other complementary separate-effect studies (eg. HEVA/VERCORS), where emphasis is placed on post-test analyses of aerosol deposits. Specific objectives from this programme are to establish an experimental database on fission product release and speciation - notably for releases in oxidizing atmospheres, to develop and test theoretical models for fission product release (specifically for release from fuel during oxidation, from molten pools, and at high pressures),to validate thermochemical models used in state-of-the-art severe accident codes, and to quantify the effects of pressure on fission product and control rod release phenomena. These objectives are consistent with Research Task B3.1 of the Fission Safety programme, and would enable these highpriority issues to be resolved. This work would also closely complement the Phebus-FP studies, providing separate-effects data with which to interpret these key integral experiments. Programa(s) EAEC-NFS 2 - Specific research and training programme in the field of nuclear safety and safeguards, 1994-1998 Tema(s) 020301 - In-vessel fission product behaviour Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador AEA TECHNOLOGY PLC Aportación de la UE Sin datos Dirección 329,Harwell 329 OX11 0QJ DIDCOT,HARWELL,CHILTON Reino Unido Ver en el mapa Coste total Sin datos Participantes (5) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo Commissariat à l'Energie Atomique Francia Aportación de la UE Sin datos Dirección Ctr Etudes de Cadarache - CE-CA 13108 Saint-Paul-lez-Durance Ver en el mapa Coste total Sin datos Commission of the European Communities Italia Aportación de la UE Sin datos Dirección Via E. Fermi 1 21020 Ispra - Varese Ver en el mapa Coste total Sin datos ENEA - Ente per le Nuove Tecnologie, l'Energia e l'Ambiente Italia Aportación de la UE Sin datos Dirección 301,Via Anguillarese 301 00060 Roma - Santa Maria di Galeria Ver en el mapa Coste total Sin datos RUHR-UNIVERSITY BOCHUM Alemania Aportación de la UE Sin datos Dirección 150,Universitätsstraße 150 44780 Bochum Ver en el mapa Coste total Sin datos UNIVERSITAET STUTTGART Alemania Aportación de la UE Sin datos Dirección 31,Pfaffenwaldring 31 70569 STUTTGART Ver en el mapa Coste total Sin datos
