A method of preventing meltdown in a reactor from damaging a pressure vessel and a system for implementing the method

Abstract

The invention relates to a method used for preventing pressure vessels from melting damages caused by molten materials in reactors. The method comprises following steps: when nuclear reactor accidents happen, a reactor container in-vessel injection IRVR system is activated, and cooling water with a volume no less than V(m<3>) is injected into the pressure vessels, wherein V=0.02*P0, P0 represents reactor core power, and the unit of P0 is MWe. The invention also relates to the reactor container in-vessel injection IRVR system which is used for the method.

Description

technical field [0001] The invention relates to the technical field of nuclear safety, more particularly to the technical field of preventing reactor core molten material from melting and damaging reactor pressure vessels when a major accident occurs in a nuclear power plant. Background technique [0002] In the design of nuclear power plants, nuclear safety is the primary issue to be considered. After the Three Mile Island nuclear power plant accident in the United States in 1979 and the Chernobyl nuclear power plant accident in the former Soviet Union in 1986, the prevention and mitigation of severe accidents have become factors that must be considered in the design of nuclear power plants. After the Fukushima accident in Japan in 2011, the prevention and mitigation of severe nuclear power plant accidents have attracted more attention from the public, governments and safety regulatory authorities of various countries. The risks of nuclear power plants mainly come from pot...

AI Technical Summary

Problems solved by technology

However, the method proposed in this patent still has certain limitations

IRVR is injected through the main cooling pipe. This method has certain risks. If the main cooling pipe is damaged, the IRVR injection will fail.

There is no flow control for cooling water injection, so if the injection is too slow, the cooling effect will not be obvious, and if the injection is too fast, it may cause a large amount of hydrogen and water vapor to be generated in a short time

In addition, this method does not determine the amount of water injected. On the one hand, if the amount of water injected is too small, it cannot fully satisfy the residual heat taken out of the core and obtain the desired technical effect. On the other hand, if the amount of water injected is too large, the volume of the cooling water tank will be too large. , or it is necessary to replenish cooling water from outside the reactor, so that the cooling water tank occupies too much space in the containment vessel, or it is necessary to replenish cooling water to specially designed pipelines, which makes the design of the reactor interior tend to be complicated

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