Method and Control System for Gas Injection into Coolant and Nuclear Reactor Plant

Abstract

The patent discloses method and control system for gas injection into the coolant of a nuclear reactor plant. The method includes the following steps: gas to be injected into the coolant is supplied from the gas system to the above-coolant space; gas is injected into the gas system from the above-coolant space. Technical result: prevention of reuse of contaminated gas.

1 . A method of injecting gas into a coolant of a reactor which is connected to the gas system and comprises device intended for injection of gas into the coolant installed partially in the coolant and partially in an above-coolant space and adapted to gas supply from the above-coolant space to the coolant, while the gas system is connected to the reactor so as to make it possible to supply gas to and remove gas from the above-coolant space, includes the following steps:
 gas to be injected into the coolant is supplied from the gas system to the above-coolant space;   gas is injected into the coolant by maintaining the gas pressure higher than coolant pressure in the device intended for injection of gas into the coolant;   gas is injected into the gas system from the above-coolant space.   
     
     
         2 . Method according to  claim 1  characterized in that gas is continuously supplied to the above-coolant space from the gas system or is continuously removed from the above-coolant space to the gas system during the gas injection into the coolant. 
     
     
         3 . Method according to  claim 1  characterized in that gas is injected into the coolant for not longer than it is required for gas injected into the coolant to reach a coolant surface. 
     
     
         4 . Method according to  claim 1  characterized in that gas removed from the above-coolant space to the gas system is filtrated and reinjected into the above-coolant space. 
     
     
         5 . Method according to  claim 1  characterized in that gas pressure in the device intended for injection of gas into the coolant is maintained higher than the coolant pressure by increasing gas pressure in a near-coolant space. 
     
     
         6 . Method according to  claim 1  characterized in that gas pressure in the device intended for injection of gas into the coolant is maintained higher than the coolant pressure by local reduction of the coolant pressure near the device intended for injection by rotating at least part of the device intended for injection of gas into the coolant. 
     
     
         7 . Control system for gas injection into a coolant of a reactor which is connected to a gas system and comprises device intended for injection of gas into the coolant installed partially in the coolant and partially in an above-coolant space and adapted to gas supply from the above-coolant space to the coolant, while the gas system is connected to the reactor so as to make it possible to supply gas to and remove gas from the above-coolant space, includes the following:
 control modulus of the gas system adapted to control the gas system ensuring gas supply to the above-coolant space of the reactor and ensuring gas removal from the above-coolant space of the reactor; and   control modulus of the device intended for injection of gas into the coolant adapted to control the device intended for injection of gas into the coolant and ensuring gas injection into the coolant from the above-coolant space.   
     
     
         8 . System according to  claim 7  characterized in that control modulus of the gas system is adapted to ensure continuous gas supply to the above-coolant space or continuous gas removal from the above-coolant space. 
     
     
         9 . System according to  claim 7  characterized in that the system includes timer and the control modulus of the device intended for injection of gas into the coolant is adapted to ensure gas injection into the coolant for not longer than it is required for gas injected into the coolant to reach the coolant surface. 
     
     
         10 . Nuclear reactor plant including:
 a reactor,   a coolant in the reactor,   a gas system connected to the reactor and adapted to gas supply to and gas removal from an above-coolant space,   a device intended for injection of gas into the coolant installed partially in the coolant and partially in the above-coolant space and adapted to gas supply from the above-coolant space to the coolant, and the gas system and device intended for injection of gas into the coolant are adapted to function in compliance with the control of the system according to  claim 7 .