Coolant dispersing device

Object: To eliminate vibrations of a neutron detector tube to prevent possible failure of a channel box. Structure: In a coolant dispersing device wherein a cover member (fixed frame) is detachably mounted upwardly of a coolant inlet formed in a core support which supports a lower portion of a fuel assembly within a reactor container, a flow dispersing plate covers an upper portion of a leak hole to laterally disperse and spread a leaked flow, which moves up from the lower plenum passing through the leak hole in a core supporting plate at the normal operation of reactor and to eliminate a local flow of core bypass flow at the lower portion of a neutron detector tube. Thus, vibration of the neutron detector tube may be prevented. (Kamimura, M.)