Safety injection system of nuclear power plant and cleaning method for cleaning its injection pipeline

Abstract

The invention provides a safety injection system of a nuclear power station and a method for clearing an injection pipeline. The clearing method comprises the steps of pressurizing the inside of a medium-pressure injection tank, switching on an isolation valve, and rinsing the injection pipeline under the effect of the pressure difference. By adopting the method for rinsing the injection pipeline of the medium-pressure injection tank of the nuclear power station, corrosive precipitate in the pipeline can be obviously removed, the sealing property of a check valve can be greatly improved, the repairing times and the personnel radiation dosage can be reduced, the major repair of the nuclear power station can be avoided, and the overhauling of the check valve at a low level can be avoided.

Description

technical field [0001] The application relates to the key technology of a mega-kilowatt nuclear power plant, in particular to a safe injection system in the nuclear power plant and a method for cleaning the injection pipeline. Background technique [0002] Safety injection system (referred to as RIS) is one of the most important nuclear island safety systems and a very important system in nuclear power plants. When the reactor coolant system (also known as the primary circuit, or RCP for short) in a nuclear power plant fails, it is easy to cause the reactor to fail to cool down and lose control. At this time, the safety injection system is used for remediation to ensure the safe operation of the nuclear power plant reactor. For example, when a small break in the inner loop of the reactor coolant system loses water, the safety injection system replenishes water to the inner loop of the reactor coolant system to re-establish the water level of the pressurizer; When , the safe...

AI Technical Summary

Problems solved by technology

Because the check valve 13 is connected to the side of the reactor coolant system 2, its pipeline is slightly upturned, forming a slight angle A with the horizontal, as image 3 As shown in middle A, it is easy to form accumulations of corrosion products at the valve disc of the check valve 13. Over time, the valve disc of the check valve 13 is not closed tightly, resulting in leakage at the check valve 13, affecting its sealing performance, which will lead to It takes manpower to repair, and in the reactor coolant system 2, the dose of nuclear radiation is unavoidable, and even the overhaul is forced to enter the low-low water level inspection check valve

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