CONTROL UNIT OF NUCLEAR REACTOR Russian patent published in 1997 - IPC

FIELD: high-temperature nuclear reactors. SUBSTANCE: device is designed as rotating cylinders which are located in side reflector of nuclear reactor and provides change of reactor characteristics during its operations. Device has stationary sealed jacket which has flanges, and rotating cylinder which is located in jacket and has neutron capturing sector insertion. It is connected to drive and has disk and two spiral springs which have opposite direction of coils, which are located in coaxial and separated by disk. Loose outer ends of springs are connected to disk flanges on opposite sides. Their inner ends are connected to control cylinder and flange of stationary jacket respectively. In addition neutron capturing sector insertion of rotating cylinder is displaced with respect to plane which runs through axes of nuclear reactor and rotating cylinder in direction of rotating cylinder movement when nuclear reactor is started. This shift is equal to size of free movement in kinematic circuit from drive to rotating cylinder. In addition rotating cylinder has elastic member. Slot of rotating cylinder in which neutron capturing insertion is located is greater than insertion in angular direction. Elastic member is located in space between neutron capturing insertion and wall of rotating cylinder slot which is directed along movement of rotating cylinder when reactor is started. In addition it has member which is made from neutron moderation material. Rotating cylinder with neutron capturing sector insertion is hollow. Its inner chamber contains rod which is made from neutron reflecting material, which is rigidly connected to flange of control unit and which carries member which is made from hydrogen- containing neutron moderating material. Latter element is located on side of active core of nuclear reactor. In addition rotating cylinder has spiral spring which is connected to flange of stationary sealed jacket in order to apply rotating momentum to cylinder in direction which is opposite to direction of cylinder rotation when reactor is started. EFFECT: increased service life of control unit, increased sensitivity, decreased weight and size, decreased tension of spring, decreased tension in spring material, increased service life of spring, decreased inertia momentum of rotating members, decreased weight. 3 cl, 5 dwg