Pressure relief check valve for serious accidents

Abstract

The invention provides a pressure relief gate valve for serious accidents. The pressure relief gate valve for serious accidents comprises a valve body, a packing box, a valve seat, a valve rod, a valve clack, an electric device, an electric fitting connection plate, a disc spring set and a support; a sealing ring is arranged between the packing box and the valve body and arranged below a pendant collet; the sealing ring comprises an upper graphite ring body, a lower graphite ring body, an upper metal ring body and a lower metal ring body; the inner circle of the lower metal ring body is in clearance fit with the outer circle of the upper metal ring body; the lower graphite ring body is arranged on the side, close to the packing box, of the space between the upper metal ring body and the lower metal ring body; and the upper graphite ring body is arranged on the side, close to the valve body, of the space between the upper metal ring body and the lower metal ring body. The discharging capacity of the pressure relief check valve can be ensured in case of serious accidents, the valve can be opened and the valve body and the packing box can be sealed in case of sharp changes, and the sealing requirement is met.

Description

technical field [0001] The invention relates to a severe accident pressure relief cut-off valve, in particular to a pressure relief cut-off valve for performing the pressure relief function of the next circuit of a severe accident to avoid high-pressure melting of the core. Background technique [0002] In severe accidents, when a high-pressure fusion reactor accident occurs in a nuclear power plant, the core melt will be sprayed into the containment under high pressure, which may endanger the integrity of the containment from the following three aspects: 1. The pulse wave formed by the melt injection has a The integrity of the containment vessel poses a direct threat; 2. The molten material directly heats the atmosphere of the containment vessel to increase the pressure of the containment vessel, resulting in overpressure of the containment vessel, or igniting hydrogen to cause a risk of rapid combustion and explosion; 3. The molten material damages the atmosphere in the con...

AI Technical Summary

Problems solved by technology

[0002] In severe accidents, when a high-pressure fusion reactor accident occurs in a nuclear power plant, the core melt will be sprayed into the containment under high pressure, which may endanger the integrity of the containment from the following three aspects: 1. The pulse wave formed by the melt injection has a The integrity of the containment vessel poses a direct threat; 2. The molten material directly heats the atmosphere of the containment vessel to increase the pressure of the containment vessel, resulting in overpressure of the containment vessel, or igniting hydrogen to cause a risk of rapid combustion and explosion; 3. The molten material damages the atmosphere in the containment vessel. Related systems, equipment and monitoring systems

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