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Recent Progress in the Modelling of Helium and Tritium Behaviour in Irradiated Beryllium Pebbles by E. Rabaglino; C. Ronchi; A. Cardella is a Engineering article available to read on EtoBox.

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One of the key issues of the European Helium Cooled Pebble Bed blanket is the behaviour under irradiation of beryllium pebbles, which have the function of neutron multiplier. An intense production of helium occurs in-pile, as well as a non negligible generation of tritium. Helium bubbles induce swelling and a high tritium inventory is a safety issue. Extensive studies for a better understanding, characterisation and modelling of the behaviour of helium and tritium in irradiated beryllium pebbles are being carried out, with the final aim to enable a reliable prediction of gas release and swelling in the full range of operating and accidental conditions of a Fusion Power Reactor. The general strategy consists in integrating studies on macroscopic phenomena (gas release) with the characterisation of corresponding microscopic diffusion phenomena (bubble kinetics) and the assessment of some fundamental diffusion parameter for the models (gas atomic diffusion coefficients). The present work gives a summary of the latest achievements in this context. By an inverse analysis of experimental out-of-pile gas release from weakly irradiated pebbles, coupled to the study of the characteristics o

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Author

E. Rabaglino; C. Ronchi; A. Cardella

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0920-3796)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)