Annular space ventilation system and method

Abstract

The invention belongs to the technical field of nuclear power station ventilation system design, and particularly relates to an annular space ventilation system. The system comprises a normal series, a first safety series, a second safety series, an electric fireproof valve b, a check valve c, a fireproof valve c, an electric fireproof valve d, a flexible connector a and a chimney, wherein one end of the normal series is sequentially connected with the fireproof valve c, the check valve c and an exhaust outlet b, and the other end is sequentially connected with the electric fireproof valve d, the flexible connector a and the chimney; one end of the first safety series is sequentially connected with the fireproof valve c, the check valve c and the exhaust outlet b, and the other end is sequentially connected with the electric fireproof valve d, the flexible connector a and the chimney; and one end of the second safety series is connected with an exhaust outlet a, and the other end is sequentially connected with the electric fireproof valve b, the flexible connector a and the chimney. According to the annular space ventilation system and method, the system design problem of maintaining the negative pressure in the annular space is solved, the operability and the automatic control of the system under the fire hazard condition are improved, and the safety and the reliability of the operation of the nuclear power station are improved.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant ventilation system design, and in particular relates to an annular space ventilation system and method. Background technique [0002] In recent years, with the continuous development of pressurized water reactor technology, many third-generation nuclear power units with a million-kilowatt class in the world have adopted double-layer containment structures. The design of the double-layer containment annular space system of different reactor types is also different. The double-layer containment of a certain pile type is a concrete structure, and an annular space ventilation system is set between the double-layer containment. When calculating the negative pressure that should be maintained in the annular space of the containment, only the influence caused by the outdoor wind load is considered, and the diffusion effect caused by the concentration difference of radioactive substances is n...

AI Technical Summary

Problems solved by technology

When calculating the negative pressure that should be maintained in the annular space of the containment, only the influence of the outdoor wind load is considered, and the diffusion effect caused by the concentration difference of radioactive substances is not considered

The emergency exhaust fan of the system adopts a two-speed fan with a small flow rate and a high pressure head. It is difficult to achieve and maintain the minimum negative pressure value required by the annular space during commissioning and operation.

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