A liquid heavy metal cooling reactor coolant evacuation system and evacuation method

Abstract

The invention discloses a liquid-heavy-metal cooling reactor coolant evacuation system and an evacuation method, and belongs to liquid-heavy-metal cooling reactor auxiliary systems. The coolant evacuation system comprises a decreasing pipeline, a rising pipeline, a valve port, a tungsten ball stopper and a gas control system. By utilizing the connection design of the pipeline and the sealing effect generated through cooperation of the tungsten ball stopper and the valve port, the coolant is evacuated out of the reactor pool of the liquid-heavy-metal cooling reactor by means of the gas pressure in the pipeline without using a liquid heavy metal pump. The evacuation system is capable of realizing evacuation of the liquid-heavy-metal cooling reactor coolant without depending on a mechanical active part contacted with a liquid metal, and guarantees an appropriate environment when the reactor internal part is maintained or retired.

Description

technical field [0001] The invention relates to a coolant auxiliary system of a nuclear reactor, in particular to an auxiliary system and an emptying method of a liquid heavy metal cooling reactor. Background technique [0002] Liquid heavy metal reactor coolants are dense, and for lead or lead alloy coolants, the density is more than 10 times that of water or sodium. During overhaul or maintenance of the reactor construction, and when the reactor is finally decommissioned, it is necessary to drain the coolant out of the reactor vessel in order to provide a suitable environment for operation. [0003] When the traditional pressurized water reactor or sodium-cooled fast reactor needs to empty the coolant, the coolant can be "pumped" out of the reactor through the pump outside the reactor, but for liquid heavy metals, the coolant is "pumped" through the pump, and the covering gas In the case of 1 atmospheric pressure, it can only be "pumped" up to a height of 1 meter (10 mete...

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Problems solved by technology

[0005] (1) A spare pump is arranged in the stack, placed near the bottom of the stack, to "push" the coolant out of the stack, but the required pump has a high pressure head (~5 times the pressure head of the main pump), and the moving parts take a long time Immersed in a liquid heavy metal environment, there may be adhesion and affect the movement;

[0006] (2) A channel is reserved to lead directly to the bottom of the pile, and a pump is temporarily placed into the bottom of the pile when emptying operation is required, and the emptying operation is performed, but the operation is extremely complicated;

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