Creation of benchmark data on JOYO and DCA reactor physics experiments

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: (a) criticality, (b) control rod worth, (c) sodium void reactivity, (d) fuel replacement reactivity, and (e) isothermal temperature coefficient. In particular, the control rod worth, a key quantity in all the reactivity evaluations, was carefully evaluated, considering interaction effects. In DCA data, three kinds of parameters measured with 1.2% UO2 fuel were evaluated: (a) critical moderator level, (b) epithermal capture ratio of 238U, (c) 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. (authors)