Passive containment accident pressure-releasing system capable of containing discharged gas

Abstract

The invention relates to a passive containment accident pressure-releasing system capable of containing discharged gas. The system comprises a containment (19) provided with a containment penetration piece (17) through which the containment (19) is provided with an accident pressure-releasing channel (1) penetrating the containment (19), wherein an inlet of the accident pressure-releasing channel (1) is provided with a high-efficiency filter (2) and a isolating valve, and the end part is connected with a pressure-releasing airbag (7) which is arranged outside the containment (19) through a pipeline butt-joint mechanism (6). Accordingly, the system can introduce part of high-pressure mixed gas into the pressure-releasing airbag (7) through the pressure-releasing channel (1) to realize inhibition of pressure rising in the containment, and starting and the whole operating process of the accident pressure-releasing system do not depend on external power supply completely by using a generalized passive control unit (18), thereby having passive features.

Description

technical field [0001] The invention belongs to a containment pressure relief system, in particular to a passive containment accident pressure relief system with the containment function of pressure relief gas. Background technique [0002] The airtight containment is an important barrier to prevent the leakage of radioactive materials in the event of an accident in a nuclear power plant. Normally, after an accident, the containment vessel will be isolated and become a closed space, and the sharply increased temperature and pressure are all borne by the containment vessel structure. This design requires the containment vessel to have a large free volume and shell thickness, and also requires the matching post-accident containment depressurization and heat removal system to have high performance. After the accident, the airtight containment of a nuclear power plant needs to face two problems. One is the export of reactor waste heat. If the waste heat export mechanism is lost...

AI Technical Summary

Problems solved by technology

After the accident, the airtight containment of a nuclear power plant needs to face two problems. One is the export of reactor waste heat. If the waste heat export mechanism is lost, the temperature and pressure inside the containment will continue to rise until the containment ruptures; the other is, In severe accidents, a considerable volume of hydrogen gas may be produced in the containment vessel. If the hydrogen gas accumulates locally or the total amount reaches the explosive limit, the possible hydrogen explosion will completely fail the containment vessel.

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