The aim of the LPP project is to quantify fission product and core materials released from molten corium. This work has examined the kinetics of release of the key fission products, lanthanides and actinides (as simulants), and also allowed the importance of key phenomena (e.g. sparging, slag formation, two-phase systems) to be examined. A series of experiments to aid with understanding the chemistry of species released during the late phase of an accident has also been carried out, together with experiments aimed at examining the long-term behaviour of a solidified core immersed in a water pool. The results from these experiments have been used to test and develop code models for the relevant phenomena. The models and experimental results have also been considered in plant calculations for Eastern European and advanced reactor designs. The results of the project will aid in the development of severe accident management strategies and provide data on fission product behaviour in the late phase of an accident. Such data are also important in the interpretation of results from the Phebus FP programme.
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Record Number: 6090 / Last updated on: 2004-07-13