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A new facility has been built at the Phebus test reactor in Cadarache, France, for investigations into phenomena of fuel damage and fission product (FP) release under severe power reactor accident conditions. Phebus-FP simulates the core cooling system and containment of a reactor accident by appropriate scaled down experimental components. The test fuel, with 25 to 30 GWd/t burnup, is re-irradiated in situ and then overheated up to UO(2) melting point. Fission products and other aerosols are swept through the primary pipework into the containment vessel, by hot steam and hydrogen. Experimental instrumentation and post-test analyses enable two main phenomena to be studied. The first is structural material and fuel dislocation, related to final fuel state and the other is the release, chemical form and transport/depletion of fission products in the facility. Studies involve particularly aerosol physics, including non-fission product material and iodine chemistry in terms of volatile species formation through radiolysis, reactions with various materials, and aerosol-vapour reactions.

Additional information

Authors: VON DER HARDT P, JRC Ispra (IT);GUILLEMARD B, CEA, Institut de Protection et de Sûreté Nucléaire, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: The Third Workshop on Severe Accident Research in Japan, Tokyo (JP), November 4-6, 1992
Availability: Available from (1) as Paper EN 37185 ORA
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