Device and method for quickly relieving pressure in primary circuit of pressurized water reactor nuclear power plant

Abstract

The invention belongs to an accident safety device for the pressurized water reactor nuclear power plant and a corresponding relieving measure and particularly relates to a device and a method for quickly relieving pressure in a primary circuit of the pressurized water reactor nuclear power plant under an accident working condition. The method comprises: leading out a group of pressure-relief exhaust pipes from the top of a pressure stabilizer, wherein quick pressure-relief valve banks are arranged in the pressure-relief exhaust pipes, the other ends of the pressure-relief exhaust pipes are connected to an inerting tank, an inerting gas is filled in the inerting tank, and an blasting film is arranged on the inerting tank; and when the temperature at the outlet of a core reaches a set value, opening the quick pressure-relief valve banks to allow a hydrogen mixture to mix with the inerting gas in the inerting tank, wherein when the inerting tank bears a certain pressure, the blasting film blasts and the mixed gas is discharged into the large space of a safety shell. The accident safety device can relieve the risks of blasting when the hydrogen enters the safety shell, provides a new protective means for preventing high-pressure core melt and high-temperature and high-pressure melt from being injected to the safety shell, and improves the economy and reduces the maintenance cost of the nuclear power plant.

Description

technical field [0001] The invention belongs to an accident safety device of a pressurized water reactor nuclear power plant and corresponding mitigation measures, and in particular relates to a rapid pressure relief device and a pressure relief method for a primary circuit suitable for an accident working condition of a pressurized water reactor nuclear power plant. Background technique [0002] When a serious accident occurs in a pressurized water reactor nuclear power plant, there are two working condition sequences according to the pressure: high pressure working condition sequence (such as power failure of the whole plant, loss of all feed water, loss of heat sink, small breach, etc.) and low pressure working condition sequence ( Medium and large breaches, etc.). Under high-pressure sequence conditions, the primary circuit and the core continue to be in a state of high temperature and high pressure, so that when the core melts and collapses and the pressure vessel fails...

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Problems solved by technology

[0004] However, the analysis shows that in the series of high-pressure melting reactor conditions, when a serious accident occurs, if the gaseous mixture from the core is discharged to the pressure relief tank or the built-in refueling water tank, due to the steam entrained in the hydrogen mixture under the action of water washing A large amount of filtration will greatly increase the threat of deflagration of the high-concentration hydrogen discharged from the pressure relief tank in the pressure relief tank compartment or the upper space of the built-in refueling water tank. In order to ensure the integrity of the containment in severe accidents, this phenomenon needs to be avoided

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