Overview of fission product behaviour in the Phebus-FP tests, including latest experimental results on the FPT2 test

摘要

The Phebus-FP programme is a wide international effort to investigate LWR severe accident phenomena, through a series of in-pile integral experiments, dealing with fuel degradation, hydrogen production, fission product release and subsequent transport/deposition in the Reactor Coolant System down to the containment building. Three tests (FPT0-2) simulating a low-pressure cold-leg break have so far been successfully performed, which provide experimental data of high interest to characterise and improve LWR safety in the event of a severe accident. The data analysis of FPT0 and FPT1 is now terminated (and available in public domain literature for FPTO), while that of FPT2 is still under progress. The present paper gives a brief overview of the lessons leamt so far regarding fission product release, emphasising latest experimental results on the FPT2 test.