Abstract
JPARC project where neutrons are generated by spallation reaction in the target system. Large heat generates in the target by the reaction. Therefore various thermal hydraulic designs are needed to release the heat from the target. In a target, in order to avoid boil of cooling water, it designs so that surface-of-a-wall temperature may turn into below saturation temperature. However, if flow rate decreases by the pump trip, saturation temperature will be exceeded and boil will take place. At this time, since there was a possibility that the flow of cooling water may become unstable, the standard over the safety of a target was acquired by the forced convective boiling heat transfer experiment.
