Automatically isolated security injection tank

Abstract

The invention belongs to the technical field of nuclear security equipment and control and relates to an automatically isolated security injection tank which comprises a security injection tank, an outlet nozzle, a floating ball, an isolation plug and a guide rod, wherein the outlet nozzle is arranged below the security injection tank, is connected with the security injection tank and is used forejecting a coolant in the security injection tank; the guide rod is vertically arranged inside the security injection tank, is connected with the outlet nozzle and is used for guiding the floating ball and the isolation plug to move up and down; the floating ball floats on the liquid level of the coolant in the security injection tank and can be moved up and down along with increase / decrease of the liquid level of the coolant in the security injection tank; the isolation plug is suspended below the floating ball and can be dropped into the outlet nozzle to plug a coolant outlet of the securityinjection tank when the security injection tank is emptied or is approximately emptied. By adopting the automatically isolated security injection tank provided by the invention, automatic isolation of the security injection tank can be achieved according to demands before the security injection tank is emptied, and the consequence that security injection functions are failed because of mal-operation can be avoided.

Description

technical field [0001] The invention belongs to the technical field of nuclear safety equipment and control, and relates to an automatic isolation safety injection box. Background technique [0002] The safety injection tank of the PWR nuclear power plant, or Accumulator (ACC for short), is an important part of the emergency core cooling system of the PWR nuclear power plant. Rapid injection of cooling water to prevent core damage. The working principle of the safety injection box is to use pressurized nitrogen to push out the coolant in the safety injection box and inject it into the main circuit or pressure vessel when the pressure of the primary circuit system decreases. [0003] At present, the main body of the safety injection box is either in the shape of a cylinder or in a spherical shape. The overall structure is relatively simple, and the development changes little. Recently, some countries have developed advanced safety injection tank designs, such as the safety ...

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that it needs a reliable actuator or power supply to support, and the safety injection tank is an important device to ensure the cooling of the core. The safety injection function is the primary function. If the automatic isolation valve malfunctions, it will lead to Functional failure, affecting the safety of the core, causing more serious consequences

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