Cavity-type containment passive cooling system of underground nuclear power station

Abstract

The invention relates to a cavity-type containment passive cooling system of an underground nuclear power station. The cooling system comprises a cooling water source, a cooling water pipe and a drainpipe. An emergency cooling water source and a long-term cooling water source can be used for realizing a mass flow of water demand in an accident condition and a small flow of long-term cooling waterdemand in middle and later periods of an accident, and position elevations of the emergency cooling water source and the long-term cooling water source are designed to be higher than an elevation ofthe top of a containment. Even in a station blackout working condition, the system is still capable of realizing passive cooling of the containment by using gravity, and ensuring no overpressure in the accident condition of the containment. A water inlet and a water outlet of the cooling water pipe are provided with radioactivity detecting devices, so a source of a radioactive substance can be determined according to a position of a radioactivity detection signal. While the radioactive substance is detected, the cavity-type containment passive cooling system can be rapidly closed, radioactivity is prevented from further polluting cooling water, and the cooling water is avoided from entering a surrounding rock mass so as to pollution underground water.

Description

technical field [0001] The invention relates to nuclear power technology, in particular to a passive cooling system for a cavern type containment of an underground nuclear power plant. Background technique [0002] With the development of the application of nuclear energy technology in the world, the safety requirements of nuclear facilities are getting higher and higher, and the voting rights of the public on the construction of nuclear facilities are also getting higher and higher. This requires technically improving the inherent safety of nuclear facilities, reducing the probability of large-scale release of radioactivity into the environment under extreme accidents, and ensuring the safety of people's lives and property. [0003] Underground nuclear power plants place reactors and other radioactive devices underground, adding another inherent safety barrier to nuclear facilities—rock mass barriers—in addition to conventional safety measures. Utilizing the inclusiveness ...

AI Technical Summary

Problems solved by technology

However, due to the generally long response time of the heat exchanger system, when the liquid droplets are sprayed into the containment under accident conditions, the rapid gasification of the droplets will lead to a sharp increase in the pressure inside the containment, bringing the risk of instantaneous failure of the containment

There is also a part of the design that uses passive heat pipes as the cold source of the containment, but the heat pipe uses the natural circulation of the working solvent to exchange heat, and is generally used as a long-term inefficient heat exchanger; if a nuclear power plant safety accident occurs, its heat exchange efficiency can meet the safety requirements

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