Nuclear power plant and non-condensable gas extraction method therefor

Abstract

A nuclear power plant includes a moisture separator reheater, a condenser, and a working steam system for a steam jet air ejector for continuously extracting a non-condensable gas from the condenser. The steam jet air ejector includes a pressure-regulating unit configured to regulate a working steam supplied to the steam jet air ejector from the condenser to a specified pressure, a working steam supply system configured to supply the working steam to the pressure-regulating unit, and a working steam delivery system configured to deliver the working steam regulated by the pressure-regulating unit to the steam jet air ejector. The working steam supply system includes a working steam source of a reactor main steam or moisture separator reheater scavenging steam, and a steam switching control system steam for switching a jet air ejector working steam from the reactor main steam to the moisture separator reheater scavenging steam by moisture separator reheater scavenging steam pressure.

What is claimed is: 
     
         1 . A nuclear power plant including a moisture separator reheater, a condenser, and a working steam system for a steam jet air ejector for continuously extracting a non-condensable gas from the condenser,
 wherein the steam jet air ejector comprises a pressure-regulating unit configured to regulate a working steam supplied to the steam jet air ejector from the condenser to a specified pressure, a working steam supply system configured to supply the working steam to the pressure-regulating unit, and a working steam delivery system configured to deliver the working steam regulated by the pressure-regulating unit to the steam jet air ejector, and   wherein the working steam supply system includes a working steam source of a reactor main steam or moisture separator reheater scavenging steam, in which a steam jet air ejector working steam is switched from the reactor main steam to the moisture separator reheater scavenging steam by moisture separator reheater scavenging steam pressure.   
     
     
         2 . The nuclear power plant according to  claim 1 , wherein the working steam supply system includes a steam switching control device configured to automatically switch the steam jet air ejector working steam from the reactor main steam to the moisture separator reheater scavenging steam when the moisture separator reheater scavenging steam pressure reaches the specified pressure. 
     
     
         3 . The nuclear power plant according to  claim 1 , wherein the moisture separator reheater is a two-stage reheat type moisture separator reheater, and the moisture separator reheater scavenging steam is at least one of moisture separator reheater first-stage scavenging steam and moisture separator reheater second-stage scavenging steam. 
     
     
         4 . The nuclear power plant according to  claim 3 , wherein the working steam system for the steam jet air ejector has a structure in which a moisture separator reheater second-stage scavenging steam line outlet is connected to a moisture separator reheater first-stage heating steam line, the reactor main steam or the moisture separator reheater first-stage scavenging steam is used as the working steam source of the working steam supply system, and the steam jet air ejector working steam is switched from the reactor main steam to the moisture separator reheater first-stage scavenging steam by moisture separator reheater first-stage scavenging steam pressure. 
     
     
         5 . A non-condensable gas extraction method for a nuclear power plant according to  claim 1 , the method comprising the steps of:
 supplying working steam from a working steam supply system to a pressure-regulating unit using a working steam system for the steam jet air ejector while regulating the working steam supplied to the steam jet air ejector to a specified pressure using the pressure-regulating unit;   regulating the supplied working steam with the pressure-regulating unit and delivering the regulated working steam to the steam jet air ejector with a working steam delivery system;   using reactor main steam or moisture separator reheater scavenging steam as a working steam source of the working steam supply system; and   switching steam jet air ejector working steam from the reactor main steam to the moisture separator reheater scavenging steam by moisture separator reheater scavenging steam pressure.   
     
     
         6 . The non-condensable gas extraction method for the nuclear power plant according to  claim 5 , wherein the nuclear power plant includes a two-stage reheat type moisture separator reheater, and the reactor main steam, moisture separator reheater first-stage scavenging steam, or moisture separator reheater second-stage scavenging steam is used as the working steam source of the working steam supply system, and the steam jet air ejector working steam is switched by moisture separator reheater scavenging steam pressures from the reactor main steam to the moisture separator reheater second-stage scavenging steam, and then to the moisture separator reheater first-stage scavenging steam. 
     
     
         7 . The non-condensable gas extraction method for the nuclear power plant according to  claim 6 , wherein the nuclear power plant includes a two-stage reheat type moisture separator reheater, and a moisture separator reheater second-stage scavenging steam line outlet is connected to a moisture separator reheater first-stage heating steam line, the reactor main steam or the moisture separator reheater first-stage scavenging steam is used as the working steam source of the working steam supply system, and the steam jet air ejector working steam is switched from the reactor main steam to the moisture separator reheater first-stage scavenging steam by moisture separator reheater first-stage scavenging steam pressure.