Passive containment depressurization filtration system

Abstract

The invention belongs to the field of nuclear power plant design, and particularly relates to a passive containment depressurization filtering system, which is arranged in a nuclear island of a nuclear power plant, comprises a double-layer containment (1) consisting of an inner containment (4) and an outer containment (5), and further comprises a heat exchange system (3) and a depressurization filtering unit (2) penetrating through the outer containment (5), wherein a containment annular space (6) is formed between the inner containment (4) and the outer containment (5), the heat exchange system (3) is used for exchanging heat in the double-layer containment (1) out of the double-layer containment (1), and the depressurization filtering unit (2) can absorb heat of the heat exchange system (3), is driven by an internal and external density difference, and exhausts gas in the containment annular space (6) in a passive mode. According to the invention, non-condensable gas in the containment annular space (6) is filtered and discharged by using a passive suction effect, so that the residual overpressure risk of the double-layer containment (1) is eliminated, and the safety of the nuclear power plant is improved.

Description

technical field [0001] The invention belongs to the design field of nuclear power plants, and in particular relates to a passive containment depressurization filter system. Background technique [0002] The containment of a nuclear power plant is the last barrier to prevent the release of radioactive products into the environment. After a serious accident, if the pressure inside the containment continues to rise, it may eventually destroy the integrity of the containment, resulting in the leakage of radioactive substances. After the Three Mile Island and Fukushima accidents, the regulatory authorities of many countries in the world require that the operation and new construction of nuclear power plants should consider mitigation measures for accidents beyond the design basis, so that the integrity of the containment can be ensured when the core is damaged, and the release The radioactivity to the environment is as low as possible. Most of the second-generation improved nuc...

AI Technical Summary

Problems solved by technology

Since the system is characterized by short-term and rapid mass-energy release, the equipment in the system has a very large transient processing capacity for exhaust gas, so the equipment has a complex structure, large volume, high equipment cost, and occupies a special equipment room , greatly affecting the economics of nuclear power plants

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