Full-range passive safety injection system

Abstract

The invention relates to a full-range passive safety injection system which comprises a reactor core water replenishing tank, a safety injection tank and a built-in refueling water tank which are connected with a primary loop of a reactor, and the positions of the reactor core water replenishing tank and the built-in refueling water tank are both higher than the pipeline elevation of the primary loop; a waterproof layer is arranged in a room in which main equipment is arranged, a submerged water tank is formed after an accident, and a reactor coolant sprayed from a primary loop crevasse and safety injection water are gathered in the submerged water tank and become a recirculating water source for providing long-term cooling of a reactor core. A universal full-range passive safety injection system design scheme is provided for an existing large pressurized water reactor, the emergency reactor core cooling, water supplementing and boronizing functions after an accident are achieved, and the system can provide high, medium, low and long-term passive safety injection after the accident of a nuclear power plant, so that the safety of the nuclear power plant is guaranteed. Therefore, primary loop water loading capacity is maintained, reactor core waste heat is guided out, and long-term passive recycling injection is realized.

Description

technical field [0001] The invention belongs to the design technology of nuclear power plants, and in particular relates to a full-range passive safety injection system. Background technique [0002] Traditional nuclear power plants usually use more powerful and more controllable active equipment (such as pumps, valves, fans, etc.) to achieve the required fluid transfer functions. Passive technology has regained attention in advanced nuclear power technology, and once represented a more advanced technological development trend. Compared with the active system, the main advantage of the passive system is simplification, canceling the active equipment, and generally not requiring complex (redundant and diverse) control systems or external power sources, which can greatly simplify the construction of the system, operation and maintenance. The passive system also contributes to safety, for example, it can reduce the dependence on operator intervention, provide a more abundant ...

AI Technical Summary

Problems solved by technology

The number of loops, the main pump and the containment form of this type of PWR are more common. However, due to the large number of loops, and the support of the main pump and the steam generator, there is a connection between the main pump and the steam generator. Therefore, the primary circuit occupies a large area, and the submerged water required for the whole range of passive movement is relatively large; at the same time, the steam condensation and return flow rate of the concrete containment is limited; and the core trap is used to cool the core melt, which needs to be submerged At the same time of the primary circuit, the stack cavity must be kept basically dry

Therefore, the passive safety injection system design of AP1000 cannot be popularized and applied on stack types other than AP1000, and the application scenarios have many restrictions and limitations

Moreover, during the project implementation process of AP1000, the defect of poor project implementability was also exposed

Images