Neutron spectrum for modified KUR core

In the Research Reactor Institute, Kyoto University, based on the plan of KUR remodeling, the works of evaluating the performance in use of the modified KUR core have been advanced. In this paper, as for the typical core model among those which are investigated at present as the works of evaluating the nuclear characteristics, the results of the evaluation of neutron flux distribution and neutron spectra are reported. In order to make the Kyoto University research reactor (KUR) into all attractive research tool, of course it is necessary to perfect attached facility and experimental facility with high performance and high accuracy, and to give high potential to the core itself. Among the basic policy for heightening the potential of the core, those directly related to the nuclear design are the improvement of neutron flux being used, the offer of wide neutron spectrum field, the reactor for both irradiation and beam, the possibility of various output patterns and the improvement of reactivity safety. In order to satisfy these basic matters, it is considered to construct the modified core with the close packed lattice using TRIGA type fuel. (K.I.)