Nuclear Science and Engineering / Volume 15 / Number 3 / March 1963 / Pages 288-295
Technical Paper / dx.doi.org/10.13182/NSE63-A26439
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Experimental evidence indicates that diffusion through the porous matrix and evaporation from the geometric surface are the rate-limiting processes in the loss of some fission products from uranium-graphite fuel. The loss of other fission products is rate-limited by unidentified processes which do not include those macroscopic diffusion or evaporation processes, but which may include diffusion or evaporation on the microscopic or granular scale.