Purging method of pressurized-water reactor nuclear island vessel and hydrogen discharging purging system

Abstract

The invention belongs to the technical field of primary coolant circuit auxiliary systems of million kilowatt-class nuclear power stations, and provides a purging method of a pressurized-water reactornuclear island vessel. A hydrogen discharging purging system for purging of the pressurized-water reactor nuclear island vessel is included. In the processes of water replenishment and nitrogen purging of a pressure-relief box, a check valve bank is arranged on a second pipeline allowing a nuclear island nitrogen supply system to be connected with the pressure-relief box, the back pressure in thepressure-relief box is lowered, the pressure-relief box can be filled with water through a water replenishment system, and the space of hydrogen-containing waste gas in the pressure-relief box is allcompressed and the hydrogen-containing waste gas is all discharged from the pressure-relief box; then the pressure-relief box is stopped replenishing and draining water until the water level in the pressure-relief box drops to the normal water level, the nuclear island nitrogen supply system replenishes nitrogen into the pressure-relief box through the second pipeline, the space available for gasstorage in the pressure-relief box is quickly filled, the hydrogen-containing waste gas in the pressure-relief box is all purged and discharged, the hydrogen content in the pressure-relief box is lowered to 0.5 V / V% or below, and the risk of hydrogen explosion is avoided.

Description

technical field [0001] The invention belongs to the technical field of primary circuit auxiliary systems of a million-kilowatt nuclear power plant, and more particularly relates to a method for purging a nuclear island container of a pressurized water reactor and a purging system for discharging hydrogen. Background technique [0002] The nuclear island used in the pressurized water reactor nuclear power plant is the general name of the pressurized water nuclear reactor in the nuclear power plant reactor containment (nuclear island container) and the various systems related to the pressurized water nuclear reactor. Its main equipment systems include the pressurized water nuclear reactor core, and the safety The primary circuit system (reactor coolant circulation system) connected to the shell (nuclear island container), and the secondary circuit system (auxiliary system) set up to support the normal operation of the primary circuit system and ensure the normal reaction of the...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a pressurized water reactor nuclear island container purging method, to solve the problem existing in the prior art in the method of purging and exhausting hydrogen by raising the water level of the pressure relief tank and supplementing nitrogen 2. Supplementary nitrogen purging will easily cause the back pressure in the pressure relief box to increase, resulting in the water in the pressure relief box not being able to fill the entire water tank, causing the space for storing hydrogen-containing waste gas in the pressure relief box to not be fully compressed, and it is difficult to remove the pressure relief box. The hydrogen-containing waste gas in the tank is completely discharged, causing the problem of high hydrogen content in the pressure relief tank

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