Patent Number: 
Section: claims

1. A method for controlling the reactivity in a solution nuclear reactor, the method comprising the steps of:(a) supplying a solution nuclear reactor having a nuclear reactor vessel therein;(b) placing one or more standpipes located in at least one low worth area of the nuclear reactor vessel, each of the one or more standpipes having a top end and an open bottom end located at a level below a solution level in the solution contained in the nuclear reactor vessel of the solution nuclear reactor;(c) supplying at least one gas system, wherein the at least one gas system is in fluidic communication with one or more of the standpipes; and(d) controlling the fluid level of the solution in the one or more standpipes via the use of the at least one gas system such that the solution nuclear reactor is maintained in a fail-safe mode. 2. The method of claim 1, wherein the at least one gas is selected from nitrogen, helium, air, or combinations of two or more thereof. 3. The method of claim 1, wherein the solution in the solution nuclear reactor remains homogeneous during controlling the reactivity in the solution nuclear reactor. 4. The method 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 reactor core. 5. A method for augmenting the control of the reactivity in a solution nuclear reactor, the method comprising the steps of:(i) supplying a solution nuclear reactor having a nuclear reactor vessel therein;(ii) placing one or more standpipes in the nuclear reactor vessel, the one or more standpipes each having an open bottom end located at a level below a solution level in the solution contained in the nuclear reactor vessel of the solution nuclear reactor;(iii) supplying at least one gas system, wherein the at least one gas system is in fluidic communication with one or more of the standpipes; and(iv) controlling the fluid level of the solution in the one or more standpipes via the use of the at least one gas system such that the solution nuclear reactor is maintained in a fail-safe mode. 6. The method of claim 5, wherein the at least one gas is selected from nitrogen, helium, air, or combinations of two or more thereof. 7. The method of claim 5, wherein the solution in the solution nuclear reactor remains homogeneous during the reactivity compensation. 8. The method of claim 5, wherein the reactivity in the solution nuclear reactor is controlled without the use of any mechanical movement of any design feature within the reactor core.