Development of annular fuel design code CEPTAR-D; Study on applicability for PCMI stress evaluation

Kamei, Miho; Ozawa, Takayuki   

Annular fuel pellet would be available to improve fast reactor fuel performance, and we have developed the "CEPTAR" to apply the annular fuel design taking into account the irradiation behaviors. CEPTAR computes the stress and strain in fuel pellet and cladding by using the generalized plane strain analysis method and the void migration model is applied to compute the fuel restructuring. On the other hand, taking into account the licensability, the fuel restructuring three-region model is applied to the fast reactor fuel design code. In this study, we developed "CEPTAR-D", in which fuel restructuring model of CEPTAR was exchanged into the "fuel restructuring three-region" model, to apply to the fuel design, and verified thermal and mechanical computations by using the results of short-term and long-term irradiation tests. Consequently, the computation accuracy of CEPTAR-D was as well as that of CEPTAR, and it was confirmed that CEPTAR-D could reasonably evaluate the stress due to PCMI.