Patent Number: 
Section: claims

1. A system for controlling a solution nuclear reactor comprising:(A) a solution nuclear reactor having a nuclear reactor vessel and a homogenous fissile solution disposed therein;(B) one or more standpipes located in at least one low worth area of the nuclear reactor vessel, the one or more standpipes having an open end located at a level below a solution level of the homogenous fissile solution contained in the nuclear reactor vessel of the solution nuclear reactor so that the homogenous fissile solution is free to move both into and out of the one or more standpipes;(C) at least one gas system, wherein the at least one gas system is in fluidic communication with the one or more of the standpipes and is configured to adjust a pressure within the one or more standpipes,wherein a fluid level of the homogeneous fissile solution in the one or more standpipes is controlled via the pressure exerted within the one or more standpipes by the at least one gas system. 2. The system of claim 1, wherein the at least one gas system utilizes at least one gas that is selected from nitrogen, helium, oxygen, hydrogen, air, or combinations of two or more thereof. 3. The system of claim 1, wherein the at least one gas system utilizes at least one gas that is selected from nitrogen, helium, air, or combinations of two or more thereof. 4. The system of claim 1, wherein the homogenous fissile solution in the solution nuclear reactor remains homogenous as the fluid level of the homogenous fissile solution in the one or more standpipes is altered. 5. The system of claim 1, wherein the reactivity in the solution nuclear reactor is controlled without the use of any mechanical movement of any design feature within the nuclear reactor vessel. 6. The system of claim 1, wherein the reactivity coefficients of the solution nuclear reactor are not permitted to become positive. 7. The system of claim 1, wherein any failure of the system results in a fail-safe condition. 8. The system of claim 1, wherein any inadvertent pressurization or depressurization of the one or more standpipes containing homogenous fissile solution results in the solution nuclear reactor being in, maintaining, and/or achieving a fail-safe condition.