A cooling water tank of a passive containment cooling system

Abstract

The invention discloses a cooling water tank of a passive containment cooling system, comprising a state monitoring water supply system and a closed box arranged outside the wall of the reactor containment to realize automatic heat management; the state monitoring water supply system is used to monitor the Describe the state of the cooling water in the closed box and replenish water according to the state; the closed box is connected with the heat exchanger arranged inside the wall of the reactor containment through a circulation pipeline; the inside of the closed box is surrounded by a water partition Divided into at least two water body units, each water body unit is connected through an overflow outlet and an inflow inlet; the circulation pipeline of the water outlet of the closed box and the circulation pipeline of the water return of the closed box are respectively connected to two different water unit. The beneficial effects of the present invention are: the cooling return water is layered for thermal management through the water body unit, and a low-temperature cooling water source can always be provided for the cooling system after the system is put into operation, so that the system can obtain higher natural circulation capacity and heat removal power .

Description

Technical field[0001]The present invention belongs to the reactor safety system design technology, and specifically, a cooling tank of a non-energy safety shell heat-insulating system.Background technique[0002]From the 1980s, the United States, Japan, France, Germany, Russia and other countries have conducted research on non-steady technology, which represents the AP1000 third-generation nuclear power unit in non-energy safety advanced nuclear power plants (patent No. EP2091050B1), other The three-generation advanced nuclear power developed by the country also has widely used this concept when designing the safety shell cooling system. For example, China's Hualong No.1 (patent No. CN102522127 B), US General - Japan Hitachi United R & D ESBWR (patent number us8917810 b2), and many more.[0003]Regardless of safety or economical consideration, the safety level of nuclear power plants is trend in the use of non-energy safety shell cooling systems.[0004]However, since the non-energy safet...

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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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