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Phebus-FP is a 1:5000 scale facility where a series of six experiments will be carried out, with the aim of modelling the release, retention and chemical behaviour of fission products during a severe accident in a light water thermal reactor. In this paper, calculations that have been performed by different organisations, and with different computer codes, in preparation for the first test FPT-0 are considered. In particular, the phenomena in the bundle are studied, with thermal hydraulics, core degradation and fission product release being of prime concern. There will be three phases in the experiment: (i) a heat-up with considerable heat generation from zircalloy oxidation; (ii) once the zircalloy is mostly consumed, a slower heat-up until the melting point of fuel is reached; (iii) the cool-down phase. Because of the high degree of clad oxidation, little interaction between zircalloy and uranium dioxide is expected. Modelling of fission product release and transport is crude. Release is expected to be slow because the fuel in this first test is fresh, although correlations used to model it can be expected to over-predict because they are based on irradiated fuel.

Additional information

Authors: SHEPHERD I, JRC Ispra (IT);SERRE F, CEA, Institut de Protection et de Sûreté Nucléaire, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: IAEA Technical Committee Meeting on the Behaviour of Core Materials and Fission Product Release in Accident Conditions in Light Water Reactors, Aix-en-Provence (FR), March 16-19, 1992
Availability: Available from (1) as Paper EN 36704 ORA
Record Number: 199211159 / Last updated on: 1994-11-29
Original language: en
Available languages: en