Abstract
Using a simple model the conditions for stationary diffusion of fission gases to open pores in porous reactor materials are quantitatively formulated. It is shown that in reactors with high fluxes the fission gases are able to escape from fuel elements with a surface temperature of 1200 °C if the pore distances are similar to those obtained under normal sintering conditions. In porous uranium phosphide with 18% open porosity there is no danger of swelling caused by fission gases even at high fuel burn up.
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