Method and device for preventing cold and excess pressure in nuclear power plant

Abstract

The invention is applicable to the technical field of nuclear power, and provides a method and device for preventing cold and excess pressure in a nuclear power plant. The method for preventing cold and excess pressure includes the steps of: monitoring the working state of a high-pressure safety injection system; if the high-pressure safety injection system is in operation, acquiring the current temperature of the inner wall of a pressure vessel and a setting value curve of a voltage regulator safety valve, and determining a current setting value of the voltage regulator safety valve accordingto the current temperature and the setting value curve of the voltage regulator safety valve; regulating the setting value of the voltage regulator safety valve according to the current setting value; detecting the current pressure of the pressure vessel under the current temperature; and if the current pressure is greater than the setting value, switching on the voltage regulator safety valve. According to the method and device for preventing cold and excess pressure in the nuclear power plant, continuous rising of the pressure of a primary circuit can be avoided, so that the pressure whichis applied to the pressure vessel is controlled within an allowable range, and the pressure vessel can be prevented from brittle fracture.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and more specifically, the invention relates to a method and device for protecting against cold overpressure in a nuclear power plant. Background technique [0002] The reactor pressure vessel of the pressurized water reactor nuclear power plant is used to carry the core and reactor internals, so that the fission reaction of nuclear fuel is limited to a confined space. Therefore, the reactor pressure vessel is an important part of the pressure boundary of the primary circuit and is an An important barrier to material escape. Reactor pressure vessels are generally forged from low-alloy steel materials. During the operation of the pressurized water reactor nuclear power plant, the reactor pressure vessel has to bear the dual effects of thermal stress and compressive stress. The pressure generated by the different temperature, the compressive stress refers to the compressive stress generated ...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a cold overpressure protection method and device for a nuclear power plant, to solve the problem that the existing cold overpressure protection method cannot overcool the primary circuit coolant caused by the rupture of the main steam pipeline, and at the same time The automatic activation of the high-pressure safety injection system provides effective protection against the risk of cold overpressure under typical accident conditions where the primary circuit pressure rises

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