Simple and efficient PCS long-term cooling water tank

Abstract

The invention provides a simple and efficient PCS long-term cooling water tank. The PCS long-term cooling water tank comprises an external reinforced concrete shell, an internal steel water tank body and a plurality of parallel air channels between the external reinforced concrete shell and the internal steel water tank body. And the flow channel is separated by a folded plate mounted on the outer surface of the steel water tank. An inlet of the runner takes the bottom of the concrete shell and the top of the shell as an outlet, and an outlet header pipe extends outwards to form a chimney structure. An ejector is installed in the area where the outlet header pipe is located, and the ejector is communicated with the interior of the water tank and an air flow channel. Thesimple and efficient PCS long-term cooling water tank is applied to the PCS starting and long-term operation process under the reactor accident condition, passive air natural circulation with the considerable flow speed is formed in the air channel by means of the high temperature of the outer surface of the steel water tank, the high flow speed is generated when water vapor in the water tank is discharged, the injection effect on air flowing is achieved, and efficient heat transfer of the outer surface of the water tank is achieved. Heat dissipation of the cooling water tank is enhanced by increasing the flowing speed of air natural circulation so as to promote long-term operation of the PCS system.

Description

technical field [0001] The invention relates to a passive safety protection facility of a nuclear power plant, in particular to a cooling water tank of a containment passive heat export system that enhances air flow through an ejector, and in particular to a simple and efficient PCS long-term cooling water tank. Background technique [0002] When a LOCA or main steam pipeline rupture accident occurs in a nuclear power plant, a large amount of high-temperature and high-pressure steam enters the containment, which continuously increases the temperature and pressure in the containment. As the third safety barrier to prevent the leakage of radioactive materials—containment shell, its integrity is closely related to the external environment and public safety. Therefore, under accident conditions, it is necessary to take some measures to reduce the temperature and pressure of the containment to protect its integrity. In the third-generation reactors, such as AP1000 and "Hualong O...

AI Technical Summary

Problems solved by technology

However, installing a heat exchanger inside the water tank will increase the resistance of air flow, which is not conducive to the improvement of the circulation flow of the system; in addition, the exposed water tank outside the containment ignores the effect of the sun on the heating of the water tank, and the cooling of the water tank by the wind speed in the atmospheric space Changes in the impact of the concrete shell against external attack

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