Cooling water tank for passive containment cooling system

Abstract

The invention discloses a cooling water tank for a passive containment cooling system. The cooling water tank comprises a state monitoring and water supplementing system and a closed box body arrangedon the outer side of a reactor containment wall body capable of realizing automatic heat management, wherein the state monitoring and water supplementing system is used for monitoring the state of cooling water in the closed box body and supplementing water according to the state; the closed box body is connected to a heat exchanger arranged on the inner side of the reactor containment wall bodythrough a circular pipeline; the closed box body is divided into at least two water body units through a water body partition plate, and the water body units are connected to an overflow outlet and anincoming flow inlet; and the effluent circular pipeline of the closed box body and the return circular pipeline of the closed box body are separately connected to the two different water body units.The cooling water tank provided by the invention has the beneficial effects that cooling return water is layered for heat management through the water body units, and a low-temperature cooling water source can be provided to the system put into operation all the way, so that the system can obtain a relatively high natural circulating ability and heat exhaust power.

Description

technical field [0001] The invention belongs to the reactor safety system design technology, in particular to a cooling water tank of a passive containment heat removal system. Background technique [0002] Since the 1980s, the United States, Japan, France, Germany, Russia and other countries have carried out passive technology research, among which the passive safety advanced nuclear power plant AP1000 third-generation nuclear power unit is represented (patent number EP2091050B1), and others The three generations of advanced nuclear power developed by the country have also widely applied this concept in the design of the containment cooling system, such as China's Hualong No. etc. [0003] Regardless of safety or economical considerations, it is a general trend to use passive containment cooling systems to improve the safety level of nuclear power plants. [0004] However, since the passive containment cooling system mainly relies on the natural circulation in the circuit...

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Problems solved by technology

[0005] In the current design scheme of passive containment cooling system, only the return water is circulated, and no efficient thermal management measures are adopted for the water tank (cold source). After re-mixing, the water tank flows out again for cooling. After a period of operation, the temperature of the inlet coolant rises significantly, and the cooling power drops sharply. It is difficult to maintain a high level of heat dissipation power for the passive containment cooling system under accident conditions. High-efficiency operation for a longer period of time achieves a faster cooling rate of the containment shell and increases the safety margin of radioactive material containment in nuclear power plants after accidents

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