Investigation of fission product behaviour in the PHEBUS test reactor
The PHEBUS facility offers the capability to study the degradation of real core material, from the early phase of cladding oxidation and hydrogen production up to the late phase of melt progression and molten pool formation. The subsequent release of fission products and structural materials is also experimentally studied, including their transport in the cooling system, and their deposition in the containment, under representative physicochemical conditions. The volatility of iodine in the containment is receiving a special interest in the first experiments, as large uncertainties are related to its modelling. FPT-0 and FPT-1, performed respectively in December 1993 and July 1996, have reached very advanced states of degradation, comparable to what was observed in TMI 2, and generated a wealth of results on core degradation and fission product behaviour. In particular, pool formation was obtained for a temperature well below the melting point of (U, Zr) O(2) and volatile forms of iodine were detected in the containment much earlier that expected. The paper reviews the facility, the present understanding of the first results, and the status of future tests.
Bibliographic Reference: Paper presented: 21st GRS-Fachgespräch, München (DE), November 3-4, 1997
Availability: Available from (1) as Paper EN 41080 ORA
Record Number: 199810057 / Last updated on: 1998-02-03
Original language: en
Available languages: en