Creation of benchmark data on JOYO and DCA reactor physics experiments

Hazama, Taira ; Shono, Akira*; Yokoyama, Kenji   

Benchmark data have been created on reactor physics experiments performed in two reactors: the experimental fast reactor JOYO MK-I and Deuterium Critical Assembly (DCA). The data were prepared for the International Reactor Physics Experiment Evaluation Project (IRPhEP). In JOYO data, five kinds of reactivity data were evaluated: (1)criticality, (2)control rod worth, (3)sodium void reactivity, (4)fuel replacement reactivity, and (5)isothermal temperature coefficient. In particular, the control rod worth, a key quantity in all the reactivity evaluations, were evaluated in detail, considering interaction effects. In DCA data, three kinds of parameters were evaluated: (1)critical moderator level, (2)epithermal capture ratio of U, (3)dysprosium thermal reaction rate distribution in a fuel assembly. Data are systematically arranged in eight kinds of core configurations, varying the assembly pitch and void fraction. Each of evaluated data has a unique feature and will be useful to validate reactor physics calculation schemes.