Core Passive Waste Heat Removal System after Accident of Large Pressurized Water Reactor Nuclear Power Plant

Abstract

The invention provides a complete passive waste heat discharge system for post-accident reactor cores of large PWR (pressurized water reactor) nuclear power plants. A top air flow channel of a shielding workshop is provided with a chimney, containment cooling water tanks are arranged around the chimney, and containment cooling water pipes are arranged in each containment cooling water tank; a cooling water distribution plate is arranged in the shielding workshop and above the top of a containment. A meshed groove is formed in the inner wall of the vertical section of the containment; multiple rows of fins are fixed on the inner wall and / or the outer wall of the vertical section and / or the dome of the containment; multiple rows of heat exchange fans are fixed on the inner wall of the vertical section and / or the dome of the containment. The upper part of the side wall of the shielding workshop is provided with a through air inlet. An air guide plate is arranged on the inner side of the shielding workshop and the outer side of the containment. According to the system, the heat transfer capacity of the steel containment is enhanced, and the air cooling capacity of the steel containment is enhanced; through changing an air flow channel between the steel containment and the shielding workshop into a streamlined design, the air resistance is reduced.

Description

technical field [0001] The invention relates to the field of dedicated safety systems for large-scale pressurized water reactor nuclear power plants, and in particular to a passive residual heat discharge system for cores after accidents in large-scale pressurized water reactor nuclear power plants. Background technique [0002] On March 11, 2011, a nuclear accident that shocked the world occurred in Fukushima, Japan. One of the main reasons for the nuclear accident was that under the super design basis accident of the earthquake and tsunami, the GE company owned by Fukushima produced The Mark I unit could not achieve effective discharge of waste heat from the core, which eventually caused the core to melt and produce a large amount of hydrogen, which indirectly overpressurized the containment. After the Fukushima incident, nuclear power safety agencies and industry have a stronger demand for long-term passive cooling capacity of nuclear power plants. The Japan Atomic Energ...

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Problems solved by technology

[0002] On March 11, 2011, a nuclear accident that shocked the world occurred in Fukushima, Japan. One of the main reasons for the nuclear accident was that under the super design basis accident of the earthquake and tsunami, the GE company owned by Fukushima produced The Mark I unit could not realize the effective discharge of waste heat from the core, which finally caused the core to melt and produce a large amount of hydrogen, which indirectly caused the overpressure of the containment vessel. At the same time, due to forced penetration of seawater for cooling, a large amount of radioactive substances leaked out.

For large pressurized water reactors, the first two points can be realized, but the third point is currently not available in any large pressurized water reactor nuclear power plant in the world.

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