Abstract: The runner for pumping hot reactor liquids includes a runner body which is connected with a shaft portion which transmits a driving torque. An annular insert is disposed between a bearing sleeve projecting from the runner body and the drive shaft portion to define an annular flow path in order to guide an auxiliary flow which, in the case of an injection operation, leads cool reactor liquid to the runner in one direction of flow and, in the case of a leakage operation, leads hot reactor liquid for cooling away from the runner in an opposite direction of flow. A closed cavity is formed between the runner body and the drive shaft portion in a transition zone between the two components so as to reduce the cross-sectional area for the transfer of heat between the runner body and the drive shaft portion. The cavity is formed by a blind bore which has a diameter greater than 30% of the outer diameter of the shaft portion.

Abstract: A tube coil of austenitic or ferritic material is bent into a coil with a steep pitch by clamping the end of the tube section to be bent in clamps located at the ends of two radial arms of the bending apparatus. One arm is then pulled away from the other arm to cause the clamped ends to displace relative to each other while a steeper pitch is imparted. The pulled arm is free to rotate while the clamps are free to pivot in planes tangential to the tube coils. In one embodiment, the clamps can also move radially of the supporting arm.

Abstract: The heat exchanger is constructed with an axial guide such that the tube bunch can move axially within a cylindrical jacket in order to compensate for vibrations due, for example, to horizontal earthquake waves. Shoes are secured to the support plates to the tube coils and are slideably mounted within elongated slots in the jacket or vice versa. Should a vertical motion occur, the shoes are able to slide within the slots while the tube coils and their support plates remain supported within the jacket.