Passive safe cooling system

Abstract

The invention discloses a passive safe cooling system. The system comprises a water replenishing tank, an advanced safe filling tank, a built-in material replacing water tank, a pressure releasing system, a passive emergency water supply system and a passive safety shell cooling system, wherein the water replenishing tank, the advanced safe filling tank, the built-in material replacing water tank and the pressure releasing system are all arranged inside a safety shell and respectively communicated with a pressure container; the passive emergency water supply system hermetically penetrates through the safety shell, corresponds to a steam generator arranged inside the safety shell and is used for realizing water supply reflowing and heat output of the steam generator; the passive safety shell cooling system hermetically penetrates through the safety shell so as to output the heat out of the safety shell. Without intervention of a passive system and an operator, the passive safe cooling system disclosed by the invention can be used for effectively realizing safety functions such as reactor core reactivity control, afterheat output and radioactive substance containment under accident conditions and ensuring that a reactor core can be cooled effectively and maintained in a safe shutdown state, so that the safety of a nuclear power station is improved and the building cost and operating cost of the nuclear power station are also greatly lowered.

Description

technical field [0001] The invention relates to the field of nuclear power plant reactor safety equipment, in particular to a non-kinetic safety cooling system suitable for concrete containment. Background technique [0002] In the active pressurized water reactor nuclear power plant, the containment is widely used in concrete structure, because the thermal conductivity of concrete itself is very poor, and the wall thickness is relatively thick, so after the accident, it is impossible to rely on the concrete containment itself to quickly and effectively dissipate the heat in the shell. Exhaust to atmosphere. For this reason, some nuclear power plants have set up active waste heat removal systems to discharge waste heat from the core, but these active systems need to rely on external power in the event of a power outage, such as relying on expensive emergency diesel engines, a complete set of active emergency The water supply system and the whole set of dynamic safety inject...

AI Technical Summary

Problems solved by technology

One of the methods is to build a steel containment vessel, and install a water tank and a sprinkler system on the top of the steel containment vessel. After a reactor accident occurs, the water cloth in the water tank is sprinkled on the steel vessel by opening the valve of the sprinkler system. The exterior of the containment vessel takes away the heat inside the containment vessel through evaporation or convection. Therefore, the water film on the steel wall outside the containment vessel is crucial to its heat transfer capability. It has been questioned, so this method not only has high construction costs, but also has been questioned about its safety performance.

Furthermore, the existing passive waste heat removal system can only bring the core heat to the built-in refueling water tank inside the containment under any accident state, but cannot directly bring the heat outside the containment

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