Vacuum pumping method for nuclear power plant reactor coolant system

Abstract

The invention discloses a vacuumizing method for a reactor coolant system of a nuclear power plant, which comprises the following steps: 1, during the period of unit maintenance, emptying the inside of a pressurizer relief tank firstly, and pumping the pressurizer relief tank to be in a vacuum state by using a vacuum pump; 2, at the beginning of unit vacuumizing and exhausting, switching on a valve on a connecting pipe line between the reactor coolant system and the pressurizer relief tank, and meanwhile, carrying out air extraction on the reactor coolant system by using the vacuum pump. According to the vacuumizing method for the reactor coolant system of the nuclear power plant, disclosed by the invention, through emptying the pressurizer relief tank in advance, so that when the reactor coolant system is subjected to the vacuumizing by using the vacuum pump, the pressurizer relief tank can contain part of gas so as to shorten the vacuumizing time of the vacuum pump, thereby achieving the purpose of shortening the air extraction time and improving the economical efficiency of the nuclear power plant under the condition of not changing the original system configuration.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, more specifically, the invention relates to a less time-consuming method for vacuuming the reactor coolant system of a nuclear power plant. Background technique [0002] Before the start-up of the nuclear power plant unit, it is necessary to fill and exhaust the reactor coolant system, especially the non-condensable gas in the inverted U-shaped tube of the vertical steam generator. At present, nuclear power plants using vertical steam generators use static exhaust plus dynamic (combined) exhaust or vacuum exhaust to complete the exhaust work of the primary circuit. In contrast, the time of static exhaust plus dynamic (combined) exhaust is significantly longer than that of vacuum exhaust; vacuum exhaust can shorten the exhaust time and improve the availability of nuclear power plants. [0003] The conventional method of vacuuming and exhausting is to operate at the water level of the main p...

AI Technical Summary

Problems solved by technology

However, in the above process, it will still take a lot of time to use the vacuum pump to first pump the reactor coolant system to 0.2 barabs

[0004] Since the time of evacuation and exhaust is limited by the volume of the reactor coolant system gas space and the volume of the vacuum pump, for nuclear power plants that have adopted vacuum evacuation, the gas space of the reactor coolant system cannot be reduced during maintenance. The capacity of the vacuum pump is also an uneconomical way to replace the vacuum pump

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