Passive direct evaporation type cooling system for double-layer concrete containment

Abstract

The present invention relates to a reactor design technology, and specifically to a passive direct evaporation type cooling system for a double-layer concrete containment. The system comprises a heat exchanger arranged inside a containment, a cooling water tank arranged outside the containment, and a steam water separation device. According to the present invention, the retention time of cooling water in the heat exchanger is increased to force the cooling water to generate a phase change, and a large amount of heat inside the containment is taken away through phase change latent heat of the water; when the temperature of the containment is less than 100 DEG C, natural circulation flow of the system is low or zero; when the severe accident is generated in the nuclear power station and the containment temperature is more than 100 DEG C, water inside the heat exchanger is heated and expands until the water is evaporated, the separated water returns back to the cooling water tank, the steam is discharged into the atmosphere outside the containment, the system is put into operation, and the natural circulation is formed. With the system of the present invention, the whole process does not require intervention by nuclear power station operators, and whether the system is put into operation is automatically selected according to the containment temperature, such that the passive system is completely achieved, the human intervention factor during accident generation is substantially reduced, and the containment cooling function is achieved independent of external energy sources.

Description

technical field [0001] The invention relates to reactor design technology, in particular to a passive direct evaporative cooling system for a double-layer concrete containment vessel. Background technique [0002] Since the 1980s, the United States, Japan, France, Germany, Russia and other countries have carried out research on passive technologies, among which the AP1000 third-generation nuclear power unit of the passive safety advanced nuclear power plant is the representative. Regardless of safety or economic considerations, it is the general trend to use passive containment heat removal system to improve the safety level of nuclear power plants. The passive containment heat removal system is adopted to ensure the long-term heat removal of the containment in the case of accidents beyond the design basis , can maintain the integrity of the containment vessel and mitigate the consequences of severe accidents. Make the reactor reach or have the safety level of the third gen...

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Problems solved by technology

The other is to use the height difference and temperature difference between the cooling water tank outside the containment and the heat exchanger inside the containment to realize natural circulation and complete the cooling function of the containment after the accident. This scheme is easy to implement in engineering, but the cooling water tank must be installed in The position of the containment is higher, and the internal boiling of the system will only occur after the external cooling water tank reaches a certain temperature

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