Cleaning device for a reactor pressure vessel

Object: To effectively remove stagnant cooling water within a pressure vessel and deposits remained in the bottom of the vessel. Structure: A device provided with a jet pump within a pressure vessel to circulate and clean a coolant in a core, including a number of nozzle for injection of the coolant arranged close to the bottom of the pressure vessel and close to the bottom plate of the jet pump. Injection of coolant causes the remained deposits to be blown off into an inlet port and guiding into a filtering and desalting unit to remove the deposits. It is to be noted that a discharge pressure of the jet pump is utilized as the coolant injection pressure noted above. (Kamimura, M.)