Nuclear power plant voltage stabilizer and its water sealing device

Abstract

The invention provides a water sealing device of a nuclear power station voltage stabilizer. The water sealing device comprises an upper head body, an inner surface overlap layer on the inner side ofthe voltage stabilizer and an insulation layer on the outer side of the voltage stabilizer, as well as a voltage stabilizer safety valve connection pipe passing through the upper head body and obliquely extended up; the voltage stabilizer safety valve connection pipe has a safety end; one end of the safety end is provided with a hot sleeve arranged in a voltage stabilizer safety valve, and the other end of the safety end is connected with a process pipe of the voltage stabilizer safety valve, wherein the safety valve includes a bend extended down into the voltage stabilizer; the tail end of the bend is positioned above the lowest point of the inner wall of the bend in the height direction. Compared with the prior art, the water sealing device has the advantages that the water sealing structure with the bend connected with the safety end of the voltage stabilizer safety valve connection pipe having the hot sleeve is utilized herein, water sealing is achieved by exothermic condensation of the voltage stabilizer safety valve, the voltage stabilizer safety valve connection pipe and the safety end via saturated steam, hydrogen leaking can be prevented, and the water sealing device is simple in structure and convenient to manufacture.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and more specifically, the invention relates to a nuclear power plant voltage stabilizer and a water sealing device thereof. Background technique [0002] The voltage stabilizer is an important pressure safety device in a nuclear power plant. Its main function is to adjust and control the pressure and volume of the main system of the primary circuit to ensure the integrity of the pressure boundary of the main system of the primary circuit. [0003] The increase of oxygen content will accelerate the chemical reaction rate of the metal. In order to slow down the chemical reaction rate of the water in the primary circuit and the impurities in the water and the metal, it is necessary to control the oxygen content in the primary circuit. When the nuclear power unit is in normal operation, hydrogen is generally filled into the capacity control box to make the hydrogen in the water in the primary ...

AI Technical Summary

Problems solved by technology

However, the U-shaped pipe cold water seal structure is located outside the upper head of the pressurizer, and the internal condensate temperature is low. When the safety valve of the pressurizer is opened, the discharge pipeline downstream of the safety valve will bear high hydraulic loads. The cold water seal structure will take up more layout space

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