초록 ▼

A separator/injector having an outlet pressure higher than an inlet pressure thereof is introduced instead of the dynamic equipment for a reactor recirculation system that is necessary in the prior art, to achieve both liquid-vapor separation and forced circulation. A jet pump and a recirculation fl

A separator/injector having an outlet pressure higher than an inlet pressure thereof is introduced instead of the dynamic equipment for a reactor recirculation system that is necessary in the prior art, to achieve both liquid-vapor separation and forced circulation. A jet pump and a recirculation flow-rate control valve are provided in a lower portion of a downcomer portion of a reactor pressure vessel. A shroud head has a double-walled structure, a two-phase liquid-vapor flow that is flowing from a lower portion of the lower shroud head is accelerated by an accelerator nozzle of the separator/injector, and a liquid component of the thus-separated flow is increased in pressure and guided into a jet pump through a space formed between the double shroud heads. Alternatively, a circular cylindrical separator/injector in which the steam nozzle and diffuser are disposed in a helical form in close proximity to the inner wall of a circular tube above the stand pipe could be provided instead of this separator/injector.

대표청구항 ▼

[ What is claimed is:] [8.] A nuclear power generation plant using a boiling-water reactor, said nuclear power generation plant comprising:a reactor pressure vessel;a plurality of fuel rod assemblies, disposed within said reactor pressure vessel, through which a coolant flows;a shroud surrounding sa

[ What is claimed is:] [8.] A nuclear power generation plant using a boiling-water reactor, said nuclear power generation plant comprising:a reactor pressure vessel;a plurality of fuel rod assemblies, disposed within said reactor pressure vessel, through which a coolant flows;a shroud surrounding said plurality of fuel rod assemblies, wherein a two-phase liquid-vapor flow comprising a liquid-phase component and a vapor-phase component is created as said coolant flows within said plurality of fuel rod assemblies, said shroud including a shroud head at an upper end thereof; anda separator/injector erected above said shroud head said separator/injector comprising:a two-phase flow accelerator nozzle having an inlet portion opening toward the interior of said shroud and an outlet portion positioned higher than said inlet portion, said accelerator nozzle accelerating said two-phase liquid-vapor flow, which is generated in said shroud and flows into said inlet portion, and discharging the same from said outlet portion;a liquid-phase capture means connected to said outlet portion of said two-phase flow accelerator nozzle and having a guide wall formed as an inverted U-shape curve, so that said two-phase flow, which is discharged from said outlet portion of said two-phase flow accelerator nozzle, is guided along a wall surface of said guide wall, said liquid-phase capture means imparting centrifugal forces to said vapor-phase component and said liquid-phase component to separate said liquid-phase component from said vapor-phase component, wherein a difference in centrifugal forces imparted to said vapor-phase component and said liquid-phase component of said two-phase flow while said two-phase flow is guided along said guide wall causes said liquid-phase component to be guided along the wall surface of said guide wall and be captured, whereas said vapor-phase component is separated from said guide wall; anda diffuser into which said liquid-phase component captured by said liquid-phase capture means is allowed to flow, said diffuser increasing the pressure of said liquid-phase component as said liquid-phase component flows therethrough, and discharging said liquid-phase component from an outlet side thereof.