[en] In the Research Reactor Institute of Kyoto University, the additional installation of a high neutron flux reactor (hereinafter, called KUHFR) with thermal output of 30,000 kW was approved in 1978, and at present, the deliberation is continued in the nuclear reactor problem council of Osaka Prefecture. In this report, the aseismatic design of the facility is mainly reported, which is one of the safety evaluations carried out at the time of the application for the approval of the installation of the KUHFR. In case of the reactor facilities for research, the thermal output is smaller than power reactors, and also the temperature and pressure in the primary system are lower, but the aseismatic design of the KUHFR is as severe as that of power reactors. The investigation of the ground in the site of the expected construction, the classification of the importance of the facilities, the determination of the earthquake motion for design, the analysis of the earthquake response of the reactor building, and the examination of the aseismatic safety of the supporting ground are reported. It is required to determine the earthquake motion for design by adequately evaluating the vibration characteristics peculiar to the place of location. For the purpose, the observation of earthquakes simultaneously at many points has been carried out since 1982 at the Kyoto University reactor. (Kako, I.)