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Report No.
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R&D on nitride fuel cycle for MA transmutation to enhance safety and economy, 14; Dimensional recovery of He-accumulated nitride pellet containing Cm by annealing

Takano, Masahide ; Takaki, Seiya 

To clarify the influence of high temperature He gas release on the MA transmutation fuel behavior, annealing experiments on a Cm-bearing nitride pellet were carried out after two years of storage at room temperature, and the results were compared with those on the Cm-bearing dioxide. Just before the annealing, the nitride pellet showed the large expansion value of 1.1%, which suggests that vacancies in grains formed voids at room temperature. During the annealing experiments, the gas swelling of the nitride pellet due to He release above 800$$^{circ}$$C was relatively slight. From the microstructure images, smaller grains and higher open-porosity of the nitride pellet resulted in the slight gas swelling. After the annealing at 1300$$^{circ}$$C, the nitride pellet still had expansion value of 0.6%, that should be taken into account when designing the pellet-cladding gap.

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