Abstract
To gain an understanding of the behaviour of fuel during hypothetical accident situations rapid heating experiments are in progress in pulsed reactors such as TREAT and in out-of-pile facilities. The role of the fission gases is particularly important in such accident situations and it is their behaviour with which we are concerned in this paper. In the paper we discuss the behaviour of intragranular gas during transient situations and construct a simple model of this which accounts for bubble movement in a temperature gradient, bubble growth through the capture of single gas atoms and coalescence amongst the bubble population, and the non-equilibrium character of the bubbles. The release of gas to the grain boundaries and intragranular swelling are determined. The model has been incorporated into the fuel behaviour code, FRUMP, and has been applied both to out-of-pile heating experiments and the in-pile TREAT test H3.
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