Apparatus for inspecting failed fuel

Object: To provide electrode rods on an inner surface of a shipper cap and pressure detectors in the form of microswitches on four sides of the outer surface thereof to positively set the shipper cap to the channel and to positively separate reactor water within the channel from ambient reactor water. Structure: When the shipper cap is set on the channel, the four sides of the cap come into contact with a grid plate to upwardly move each rod against a return spring, and each microswitch is actuated through contact to light the indicating lamp, after which air is fed into the shipper cap to move a water level of reactor water within the channel from the electrode, thus separating from the ambient reactor water for subsequent operation for inspecting failed fuel. (Kamimura, M.)