Development of core design optimization process towards design efficiency and reduction of excessive conservativeness; Setting of representative problem and investigation of core design optimization process

Hamase, Erina ; Kuwagaki, Kazuki  ; Doda, Norihiro  ; Yokoyama, Kenji   ; Tanaka, Masaaki  

To improve efficiency and innovate the core design process by decreasing the excessive conservativeness using a function of the design optimization support tool named ARKADIA-Design, firstly, the optimization process that provides the core design specifications with high core performance and inherent safety in ULOF event has been developed. The objective function in the optimization problem is set with the indexes of core performance and thermal transient loads for the simplified loop model. The problem is solved by the coupled analysis between the core design analysis and plant dynamics analysis with Bayesian optimization (BO). It was indicated that the optimization process using the neutronics and plant dynamics analysis with BO in a single objective function could obtain the optimal solution.