DEVELOPMENT OF FISSION GAS BUBBLE MODELS FOR UO2 FUEL IN FRAMEWORK OF MFPR CODE (PREPRINT IBRAE-2000-08)

Preprint IBRAE-2000-08

Veshchunov M.S., Berdyshev A.V., Tarasov V.I. 

In order to improve the microscopic description of the fission gas behaviour in UO₂ fuel, the new models are developed and implemented in the mechanistic code MFPR. The models treat irradiation and thermal resolution effects on intra- and intergranular bubbles under various conditions of UO₂ fuel operation: steady-state irradiation, transient and post-irradiation annealing. Implementation of the newly developed models in the MFPR code allows a significant improvement of code predictions with respect to gas release and fuel swelling, being also in a fair agreement with microstructure observations in various tests. 

Bibliographical reference

Veshchunov M.S., Berdyshev A.V., Tarasov V.I. Development of Fission Gas Bubble Models for UO₂ Fuel in Framework of MFPR Code. Preprint IBRAE-2000-08. Moscow: Nuclear Safety Institute. December 2000. 38 p. — Refs.: 44 items.