Small reactor passive core cooling system

Abstract

The present invention discloses a small reactor passive core cooling system including a water replenishing tank, pipes of the water replenishing tank, a safe water injection pool, pipes of the safe water injection pool, a residual heat exchanger, pipes of the residual heat exchanger and a circle-structure shielding water pool, the circle-structure shielding water pool is arranged around a pressure vessel, the circle-structure shielding water pool is provided with a suppression pipe ad a water pipe, a pressure relief pipe is arranged between the shielding water pool and a reactor coolant, and the pressure relief pipe is used for communication of the reactor coolant and a water body in the shielding water pool, and is provided with a valve group. The small reactor passive core cooling system can be used as an important part of a passive safety system of a small containment vessel to achieve the functions of taking away reactor core decay heat and providing a safe water injection source in accidents, and can effectively suppress containment vessel peak pressure. The system equipment layout is compact, space occupation is small, arrangement is simple, and economical efficiency is high.

Description

technical field [0001] The invention relates to the field of safety system design of nuclear power plant reactors, in particular to a passive core cooling system of small reactors. Background technique [0002] The core cooling system of a nuclear power plant is part of the safety system, and its main function is to take out core decay heat and keep the core submerged after an accident. The second-generation pressurized water reactor nuclear power plant (such as Daya Bay Nuclear Power Plant, etc.) generally adopts active technology, that is, using an external power source, relying on the pressure head of the pump to drive the cooling circuit to operate, so as to realize the functions of removing core decay heat and injecting water into the core. Third-generation pressurized water reactor nuclear power plants (such as Sanmen Nuclear Power Plant) generally adopt passive technology, that is, relying on natural driving forces such as gravity, natural circulation, and compressed ...

AI Technical Summary

Problems solved by technology

Although core make-up water tanks can be installed in the high-pressure stage, a safety injection water source with a larger amount of water needs to be provided in the low-pressure stage, but the space in the small containment vessel is compact, and it is difficult to arrange a special low-pressure safety injection water pool;

[0006] 3. After the accident, the core decay heat is generally discharged from the core through the heat removal circuit

Due to the small volume of the containment vessel, it is best to place the terminal of the pressure relief circuit in the water space, so as to avoid the pressure burden on the containment vessel from the steam released from the pressure relief. However, it is also difficult to arrange a water pool for absorbing the heat of the pressure relief circuit in a small containment vessel

[0008] 5. For serious accidents that are often considered in the safety design of PWRs, the method of retaining melt in the reactor is generally adopted, but this method requires sufficient water sources in the containment

Similarly, a dedicated water source cannot be arranged for a small containment vessel due to its small volume

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