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Method used for preventing pressure vessels from melting damages caused by molten materials in reactors, and system used for method

A technology for a reactor vessel and a pressure vessel, which is applied in the field of preventing the melt damage of the reactor core melt to the reactor pressure vessel and the nuclear safety field, can solve the problems of insignificant cooling effect, no flow control of cooling water injection, damage to the core, etc., to avoid Adverse interactions, avoid core damage, implement simple effects

Inactive Publication Date: 2013-12-04
STATE NUCLEAR POWER TECH
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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, the method is to start the injection cooling of the reactor in the event of a reactor accident, that is, before the core melts down, so this injection may artificially damage the reactor core unnecessarily
These limitations limit its practical application in engineering

Method used

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  • Method used for preventing pressure vessels from melting damages caused by molten materials in reactors, and system used for method

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Embodiment

[0042] Such as figure 1 As shown, when the nuclear power plant (power 1400MWe) loses cooling, the ERVC system is immediately started to cool the reactor pressure vessel, and at the same time monitor the core outlet temperature, that is, the outlet temperature at the cooling pipe 420 . When the core outlet temperature monitoring device detects that the core outlet temperature rises to 650°C, the automatic control system (not shown) starts the injection IRVR system in the reactor vessel, opens the valve 21 on the pipeline 210, and injects the IRVR into the IRVR injection box. 28m out of 20 3 The boron-containing aqueous solution is injected into the reactor pressure vessel through the pipeline 210 and the direct injection pipeline 510, and the injection time is about 10 minutes, during which the ERVC system keeps working.

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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 it is detected that a temperature of a reactor core outlet rises to 650 DEG C, a reactor container in-vessel injection IRVR system is activated, and a cooling agent is injected into the pressure vessels. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C15/18G21C15/00
CPCY02E30/40Y02E30/30
Inventor 赵瑞昌刘志弢
Owner STATE NUCLEAR POWER TECH
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