Test 4 of ORNL's HI series is selected here for analysis with the mechanistic approach of the MFPR module, still being development, with the particular aim of testing the physical models of the code on a low burn-up fuel experiment. MFPR is a mechanistic, fission product (FP) release code which treats the main volatile and lower volatility FPs. Volatile fission products remain mainly as intragranular atoms before being released from the grains. The formation of intragranular bubbles happens too late and formation of bubbles is too low within the intergranular porosities. This implies that some changes to the modelling may be due. Effects of grain growth were investigated.
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