Non-return combination valve structure for control rod drive line and control rod water pressure drive system

Abstract

The invention relates to the technical field of nuclear reactor engineering, and provides a non-return combination valve structure for a control rod drive line and a control rod water pressure drive system. The non-return combination valve structure comprises a valve body, a valve cover arranged on the valve body, control valve assemblies arranged on the valve cover, a water filling pipe and a non-return piston. A valve body cavity, a non-return channel, cylinder admission water holes and zero return water holes are formed in the valve body, the cylinder admission water holes are communicatedwith the valve body cavity, the non-return channel is communicated with the valve body cavity and the zero return water holes, and the non-return piston is arranged in the valve body cavity; the waterfilling pipe is communicated with the valve body cavity and a water pressure driving loop; and the control valve assembly is suitable for controlling opening and closing of the cylinder admission water holes and the zero return flow holes so as to control a hydraulic cylinder to execute actions. According to the technical scheme, the non-return piston can block the end, communicated with the valve body cavity, of the water filling pipe when accidents such as pipe breakage happen, so that the water loss accident of a pressure container is avoided, and the operation safety of the control rod water pressure driving system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor engineering, in particular to a control rod drive line check combination valve structure and a control rod hydraulic drive system comprising the control rod drive line check combination valve structure. Background technique [0002] In nuclear reactor engineering, after the coolant (water) in the reactor pressure vessel is pressurized by the circulating pump, it is injected into the hydraulic cylinder of the drive mechanism through the combined valve structure, and the constant water flow or pulsed water flow generated by the combined valve controls the hydraulic cylinder to keep the control rods A stepping movement may be generated at a certain position to control the operation of the reactor. The existing combination valve structure will cause a water loss accident in the pressure vessel in the event of an accident such as a break in the water inlet pipe, thereby easily causing a safety a...

AI Technical Summary

Problems solved by technology

[0002] In nuclear reactor engineering, after the coolant (water) in the reactor pressure vessel is pressurized by the circulating pump, it is injected into the hydraulic cylinder of the drive mechanism through the combined valve structure, and the constant water flow or pulsed water flow generated by the combined valve controls the hydraulic cylinder to keep the control rods In a certain position, a step-by-step movement may be generated to control the operation of the reactor. The existing combined valve structure will cause a water loss accident in the pressure vessel in the event of an accident such as a break in the water inlet pipe, which will easily lead to a safety accident.

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