Passive steel containment heat export system

Abstract

The invention belongs to the technical field of nuclear power plant reactor safety systems, and particularly relates to a passive steel containment heat export system, which is characterized in that a cooling cover (7) is arranged on the side wall of a containment (1) of a reactor and forms a closed annular cavity (5) with the containment (1), a cooling water loop is arranged on the cooling cover (7), the cooling water loop can inject cooling water into the annular cavity (5) from the bottom of the cooling cover (7) in a passive mode, the cooling water absorbing heat in the annular cavity (5) can flow back into the cooling water loop from the top of the cooling cover (7) in a passive mode, and the containment (1) is made of stainless steel. According to the invention, dependence of a traditional active safety system on a safety-level power supply is eliminated, high natural circulation capacity and heat removal capacity are achieved, and the capacity of relieving accident consequences for a long time without intervention after an accident is provided.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant reactor safety systems, and in particular relates to a passive steel containment heat export system. Background technique [0002] The containment vessel is the last containment barrier for light water reactor nuclear power plants to prevent a large amount of radioactive fission products from the core from being released to the external environment. Under accident conditions in nuclear power plants, a large amount of high-temperature fluid (water and steam) will be released from the reactor cooling circuit into the containment space, causing a significant increase in temperature and pressure, thereby threatening the integrity of the containment structure. [0003] Traditional pressurized water reactor nuclear power plants use active containment sprinkler system to reduce the pressure and temperature of the containment, but this method cannot cope with the over-design basis condition of...

AI Technical Summary

Problems solved by technology

For example, in the AP1000 scheme, the cooling water is directly lost to the environment after flowing through the outer wall of the containment, and the containment can no longer be cooled.

At the same time, considering the capacity limitation of the top water tank 2, the passive containment cooling system can only be effective for 72 hours

Another example is the passive containment heat export system disclosed in ZL201110437864.6. On the one hand, the heat exchanger 3 is located in the containment, and the local accumulation of non-condensable gas near the heat exchanger 3 will weaken the ability of steam to condense and exchange heat; Due to the limitation of the layout space, the contact area of ​​the heat exchanger 3 is limited, which affects the further improvement of the heat exchange power; in addition, the cooling water tank 2 arranged outside the containment increases the number of penetrations, while the cooling water tank 2 arranged inside the containment The failure of the heat exchanger 3 will also introduce an additional risk of containment flooding

ZL201410371100.5 discloses a solution for the external concrete pool of the steel containment. In order to realize the submersion of the containment, a concrete pool structure needs to be built outside the containment. For water reactor power plants, the construction difficulty and cost are relatively high; and because the water in the pool cannot flow, it is easy to form thermal stratification and reduce the overall heat exchange and cooling efficiency

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