Apparatus for filtering radioactive materials

Abstract

The invention relates to an apparatus for filtering radioactive gases that are generated from nuclear fuel leaked in an accident inside a nuclear power plant and, more specifically, to an apparatus for filtering which is for preventing contamination inside a nuclear reactor building. The apparatus comprises: an inlet pipe portion for drawing in a radioactive gas, generated from a molten core, by means of high pressure in a nuclear reactor cavity; and a filtering portion for removing radioactive substance in the radioactive gas, which has flowed in through the inlet pipe portion, by means of dry and wet procedures in sequences and for discharging the safe gas, from which contaminants have been removed, outside a nuclear reactor building, wherein the inlet pipe portion is connected to the upper outer peripheral side of the nuclear reactor cavity. The invention can prevent contamination of equipment of the nuclear reactor building and the atmosphere, before the radioactive gas is emittedoutside the building, by means of connecting the filtering portion to the upper outer peripheral side of the nuclear reactor cavity by means of the inlet pipe portion. And the invention enables an increase of the filtration rate of the radioactive gas by means of a dual procedure of a dry filter, using the pressure and the heat of the nuclear reactor cavity, and a wet filter using an in-containment refueling water storage tank (IRWST) in the nuclear reactor cavity containing cooling water.

Description

technical field [0001] The present invention relates to a filter device for filtering radioactive gas produced by leaked nuclear fuel when an accident occurs in a nuclear power plant, and more particularly, to a filter device capable of preventing internal pollution of a nuclear reactor building. Background technique [0002] When a major accident occurs in a nuclear reactor building, a large amount of radioactive gas is discharged from the core melting. The vast majority of radioactive gas effluents from nuclear power plants are treated before being vented into the atmosphere. A common practice today is to extract radioactive particles from the effluent of the radioactive gas before venting it into the atmosphere, which requires filtering the contaminated gas from the radioactive gas and ventilating the building. In general, the ventilation and purification system can filter out 99.9% of particles with a diameter of about 0.3mm. [0003] Radioactive contamination refers t...

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Problems solved by technology

[0005] Moreover, according to the filter exhaust system in the existing literature, before the radioactive substances generated in the nuclear reactor cavity are discharged outside the building, the radioactive substances have already polluted the equipment and air in the nuclear reactor building, so there is still a need to detoxify the nuclear reactor building The problem

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