Primary circuit coolant charging and discharging system

Abstract

The present invention provides a primary circuit coolant charging and discharging system. The system comprises a coolant storage tank, a primary circuit discharged coolant tube connected with the coolant storage tank, a coolant charging and discharging tube connected with the primary circuit discharged coolant tube, a coolant transfer pump arranged on the coolant charging and discharging tube andused for pumping a coolant into the coolant storage tank, and a submersible pump arranged in a primary circuit reactor main container, connected with the coolant charging and discharging tube and usedfor providing a suction head for the inlet of the coolant transfer pump, wherein the primary circuit discharged coolant pipe, the coolant transfer pump, the coolant charging and discharging tube andthe submersible pump constitute a primary circuit coolant discharging pipeline used for discharging the coolant from the reactor main container into the coolant storage tank. The charging and discharging system can reduce the liquid level of the main container to be below the bottom weld of the main container, so the maintenance and replacement of internal devices of the main container and the inspection of welds in the main container can be realized.

Description

technical field [0001] The invention relates to the technical field of nuclear power, in particular to a primary circuit coolant charging and discharging system of a nuclear reactor using heavy metal or heavy metal alloy as coolant. Background technique [0002] Nuclear reactors that use heavy metals or heavy metal alloys as coolants have high coolant density. Under the same pressure difference, the liquid column height of high-density coolant can only reach 1 / 10 or less of the water column height; generally avoid filling and discharging during design The position of the upper opening of the pipe and the main vessel is lower than the normal liquid level to avoid the risk of core exposure caused by the loss of the primary circuit coolant caused by the rupture of the pipe; and there is a large height difference between the bottom of the reactor main vessel and the coolant storage device. In this case, it is difficult to discharge and drain the coolant directly by simply using ...

AI Technical Summary

Problems solved by technology

In this case, it is difficult to discharge and exhaust the coolant by simply using a pump to directly pump the high-density coolant in the main container

If the primary circuit coolant discharge measures are not provided, it will be difficult to repair and replace the equipment in the main container, and it will be difficult to repair the welds in the main container

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