Patent Number: 045044392
Section: claims

1. A gas cooled nuclear reactor comprising: a reactor core, at least one closed circuit having a heat absorbing member for receiving cooling gas from said reactor core, a hot gas conduit and a cold gas conduit connecting said heat absorbing member to said reactor core and means for mixing at least a portion of a cooled cooling gas from an outlet side of said heat absorbing member with hot gas downstream of said reactor core and in said hot gas conduit, said means comprising at least one adjustable valve, a conduit connecting said valve with said cold gas conduit and a plurality of tubes projecting into said hot gas conduit, and a distributor head having a plurality of orifices mounted on each of said tubes for dispersing cold gas into said hot gas conduit thereby controlling the temperature of said cooling gas. 2. The gas cooled nuclear reactor of claim 1, wherein said plurality of tubes project into said hot gas conduit against the flow of hot gas in said hot gas conduit. 3. The gas cooled nuclear reactor of claim 2, wherein said hot gas conduits divert the flow of hot gas by means of an apertured plate obliquely positioned in said conduit at a point of diversion of said cooling gas. 4. The gas cooled nuclear reactor of claim 1, wherein said valve is controlled by a regulator. 5. The gas cooled nuclear reactor of claim 14 wherein said heat absorbing member comprises a heat exchanger. 6. The gas cooled nuclear reactor of claim 5, further including an apertured plate which defines a point of diversion of said cooling gas wherein said plurality of tubes project into said hot gas conduit at a point between said reactor core and said apertured plate and at said point of diversion. 7. The gas cooled nuclear reactor of claim 5, further including an apertured plate mounted in said hot gas conduit wherein said plurality of tubes project into said hot gas conduit and through said apertured plate. 8. A process for controlling the temperature in a circuit of a high temperature gas cooled nuclear reactor comprising: flowing hot gas from a reactor core through a hot gas conduit and then into a heat absorbing member where it is cooled, and then flowing cooled gas through a cold gas conduit and back to a reactor core;  diverting at least a portion of said cooled gas flowing through said cold gas conduit to a gas mixing device;  introducing said diverted cooled gas from said gas mixing device into said hot gas from said reactor through a plurality of tubes extending into said hot gas conduit before entry of the hot gas into said heat absorbing member, said cooled gas being introduced through a plurality of multiple orifice distributor heads respectively mounted on said plurality of tubes, said portion of cooled gas being controlled by an adjustable valve member. 9. The process of claim 8, wherein a plurality of circuits receive hot gas from a reactor core and said adjustable valve member is operable to control the temperature of the cooling gas, said temperature control being independent in each circuit. 10. The process of claim 8 or 9, wherein said introducing comprises introducing said cooled gas in a direction countercurrent to the flow of hot gas in said hot gas conduit. 11. The process of claim 8 or 9, wherein said introducing comprises introducing said cooled gas essentially perpendicular to the flow of hot gas in said hot gas conduit. 12. The process of claim 8 or 9, further including the step of diverting said hot gas flow at a first point upstream of said heat absorbing member wherein said introducing comprises introducing said cooled gas into said hot gas conduit at a second point downstream of said first point.