A system and method for ultimately ensuring containment function and preventing large-scale radioactive release

Abstract

The invention belongs to a design technique of a nuclear power plant and specifically relates to a system for finally guaranteeing functions of a containment vessel and preventing large-scale radioactive release and a method thereof. The system comprises a containing space arranged outside the containment vessel. The containing space is connected with the containment vessel through a pipeline arranged inside an underground pipe gallery. The pipeline is provided with an isolating valve. A pressure-relief air inlet connected with the pipeline is disposed inside the containment vessel. A check valve, a filter unit and an exhaust fan which are connected with the pipeline are arranged inside the containing space. When a serious accident happens in a nuclear power plant and a containment vessel fails to release heat and reduce pressure, the system provided by the invention can be adopted to reduce pressure of the containment vessel effectively and prevent overtemperature and overpressure failure of the containment vessel and large-scale radioactive release caused by the failure or reduce radioactive release to the environment when the containment vessel has failed.

Description

technical field [0001] The invention belongs to the design technology of nuclear power plants, and in particular relates to a system and method for finally ensuring the function of a containment shell and preventing large-scale radioactive release. Background technique [0002] In the case of a severe accident in a nuclear power plant, if all containment heat removal measures fail, the temperature and pressure inside the containment will continue to rise. It will cause the containment to face the risk of overpressure failure. [0003] At present, many nuclear power plants have installed containment filtration and discharge systems. When the containment is overheated and overpressured in severe accidents, the atmospheric pressure in the containment will not exceed its load limit through active pressure relief to ensure the integrity of the containment. The radioactive substances in the exhaust gas are filtered through the filter device to reduce the release of radioactive su...

AI Technical Summary

Problems solved by technology

[0004] However, the containment filtration and discharge system can only filter a small part of radioactive substances such as aerosols and iodine, and most of the radioactive inert gases will still be discharged into the environment

Although this system ensures the integrity of the containment under severe accident conditions and avoids the uncontrollable release of radioactivity, it still causes a large amount of radioactivity to be released to the environment

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