Flooded-type containment complete passive after-heat removal system

Abstract

The invention relates to the field of an engineering safety system of a nuclear power station reactor, and in particular relates to a flooded-type containment complete passive after-heat removal system with final hot traps after accidents, in order to solve the problem that after the safety accidents of a nuclear power station, cooling water evaporates completely, and most final hot traps are lost for the flooded-type safety shell. A flow guide plate is in a framework structure with a sealed periphery, and a plurality of limber holes are formed in the lower part of the flow guide plate; the flow guide plate is placed on the bottom of a water tank, surrounds the containment, and is immersed into cooling water; an evaporation end of a separated-type cooling device is placed in cooling water at the outer side area of the flow guide plate; a condensation end of the separated-type cooling device is configured into a chimney. Heat emitted by the containment is transmitted to the separated-type cooling device through the natural circulation of a cooling liquid, and the separated-type cooling device removes heat through the chimney again. The system adopts mature equipment and is driven passively, thus the system running reliability and safety are guaranteed, and further the safety of a nuclear power station is increased obviously.

Description

technical field [0001] The invention relates to the field of special safety systems for nuclear power plant reactors, in particular to a passive residual heat export system for water-flooded containment with final heat sinks after an accident. Background technique [0002] After an accident in a nuclear power plant, as long as three conditions are met, the safety of the unit can be guaranteed. These three conditions are: 1. Reactivity control, 2. Radioactive containment, and 3. Waste heat discharge. For the discharge of waste heat in the third point, relatively speaking, the technical difficulty is greater, and the safety requirements are high, but it is often unsatisfactory. [0003] At present, the waste heat export methods commonly used in nuclear power plants are as follows. Both the second generation nuclear power plant and the third EPR nuclear power plant adopt the active waste heat discharge method, that is, use multiple sets of redundant safety power supplies and pu...

AI Technical Summary

Problems solved by technology

This design has its advantages, but it also has its disadvantages, because the decay heat of the core of the nuclear power plant exists for a long time. When the heat is discharged, the cooling water submerged in the upper part of the containment evaporates to take away the heat, but the water capacity is limited. When After a long time, after all the cooling water has evaporated, the water-flooded containment will lose most of the final heat sink

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