Abstract: The present invention is a control rod guide tube cleaning apparatus in a nuclear reactor which includes a rod member, one end side portion of which has a thickness such that the end side portion can pass through the inside of a connecting portion between a housing of a control rod drive mechanism and a control rod guide tube, a nozzle for sucking water, mounted on the rod member on the one end side so that the nozzle can go in and out of the rod member, a means for rotating the rod member in a horizontal direction, and a water passage for leading water sucked in the nozzle to an outside of the housing along the rod member. The rod member is inserted into the control rod guide tube through the inside of the housing. Then, the nozzle is rotated downward so that a suction port of the nozzle faces the bottom inside portion of the control rod guide tube for the suction of dust and debris. The nozzle is rotated in the horizontal direction by rotating the rod member in the horizontal direction.

Abstract: The present invention is a control rod guide tube cleaning apparatus in a nuclear reactor which comprises a rod member, one end side portion of which has the thickness such that the end side portion can pass through an inside of a connecting portion between a housing of a control rod drive mechanism and a control rod guide tube, a nozzle for sucking water, mounted on the rod member on the one end side so that the nozzle can go in and out of the rod member, a means for rotating the rod member in a horizontal direction, and a water passage for leading water sucked in the nozzle to an outside of the housing along the rod member. The rod member is inserted into the control rod guide tube through the inside of the housing. Then, the nozzle is rotated downward so that a suction port of the nozzle faces adjacently to the bottom inside the control rod guide tube. The nozzle is rotated in the horizontal direction by rotating the rod member in the horizontal direction.

Abstract: This invention relates to an apparatus for manufacturing a T-joint, which consists of a tube portion and a collar portion, by using burring techniques. The apparatus is provided with a high-frequency induction heating unit for heating the circumferential portion of a pilot hole made in a tube, a cooling ring for ejecting a coolant to the circumferential portion of the pilot hole, and a temperature distribution control for controlling the heating rate of the heating unit and the coolant ejection rate of the cooling ring. The apparatus thus constructed enables the working temperature of the parts of the circumferential portion of the pilot hole in the plane of which includes the axes of the tube and the collar to be lower than that of the parts of the circumferential portion in the plane extending at right angle to the above-mentioned plane.

Abstract: A method and apparatus for increasing a thickness of a tubular member which ensures a uniform thickness increase of the tubular member and a reduction of an increase in a thickness on an inner diameter side of the tubular member. A portion of the tubular member is subjected to upsetting by applying thereto a compressive force in an axial direction of the tubular member, while the portion is being heated locally and progressively so that a surface layer of the portion of the tubular member reaches a high temperature and a thermal gradient is generated between inner and outer diameter portions of the tubular member. A loading arrangement is provided which is adapted to apply a compressive force in the tubular member in an axial direction thereof, with an annular heater being arranged around an outer circumference of the tubular member. The annular heater is capable of being moved in an axial direction of the tubular member and a control device is provided for controlling a temperature of the heater.