Patent Number: 
Section: claims

1. A system for producing electricity and steam comprising:a Brayton power conversion cycle employing helium as a working fluid in a first closed loop wherein the first closed loop comprises:a heat source comprising a nuclear reactor; wherein a core of the nuclear reactor is cooled using helium;a power conversion system comprising a turbine, a compressor, and an electrical generator, wherein the compressor, the turbine, and the electrical generator are in operative communication with each other; wherein the turbine is located downstream from the heat source and is in fluid communication with the heat source, and the turbine is a high pressure turbine that receives helium at a pressure in the range of about 50 to about 90 kg/cm2;a heat recovery steam generator, located downstream of the turbine and in fluid communication with the turbine, where the steam generated is at a pressure that is less than or equal to about the pressure of the helium in the first closed loop; anda waste heat removal heat exchanger, located downstream of the heat recovery steam generator and in fluid communication with the heat recovery steam generator wherein, the heat recovery steam generator is operative to extract heat from helium and superheat the steam to a temperature of about 200 to 400° C. and a pressure of about 4 to about 12 kg/cm2. 2. The system of claim 1, further comprising a second loop in operative communication with the first loop, wherein the second loop employs water and steam as the working fluid. 3. The system of claim 1, wherein the first closed loop further comprises a steam superheater located downstream of the heat source and in fluid communication with the heat source, located upstream of the turbine and in fluid communication with the turbine; wherein the steam superheater is operative to extract heat from helium and superheat steam to a temperature of about 400 to 900° C. and a pressure of about 4 to about 12 kg/cm2. 4. The system of claim 2, further comprising a solid oxide electrolyzer cell or cells located downstream of the heat recovery steam generator and in fluid communication with the heat recovery steam generator; wherein the solid oxide electrolyzer cell is operative to electrolyze steam and convert it to hydrogen and oxygen. 5. The system of claim 1, further comprising a steam turbine located downstream of the heat recovery steam generator and in fluid communication with the heat recovery steam generator; wherein the steam turbine is operative to generate electricity. 6. The system of claim 2, further comprising a steam methane reformer located downstream of the heat recovery steam generator and in fluid communication with the heat recovery steam generator; wherein the steam methane reformer is operative to produce hydrogen from natural gas. 7. The system of claim 2, further comprising a steam radiator located downstream of the heat recovery steam generator and in fluid communication with the heat recovery steam generator; wherein the steam radiator or radiators are operative to heat a building or buildings. 8. The system of claim 1, wherein the first closed loop further comprises an economizer located downstream of the Heat Recovery Steam Generator and in fluid communication with the Heat Recovery Steam Generator; wherein the economizer is operative to extract heat from helium and heat water to a temperature of about 100 to 200° C. and a pressure of about 4 to about 12 kg/cm2. 9. The system of claim 1, wherein the first closed loop further comprises a recuperator. 10. The system of claim 9, wherein a hot side of the recuperator is located downstream of the heat recovery steam generator and upstream of the compressor, and is in fluid communication with the heat recovery steam generator and the compressor; wherein a cold side of the recuperator is located downstream of the compressor and upstream of the nuclear reactor, and is in fluid communication with the compressor and nuclear reactor; wherein the recuperator is operative to extract heat from the hot side helium and transfer it to the cold side helium. 11. The system of claim 1, wherein the first closed loop further comprises an intercooler. 12. The system of claim 11, wherein the intercooler is located downstream of a low pressure compressor and upstream of a high pressure compressor and is in fluid communication with the low pressure compressor and the high pressure compressor; wherein the intercooler is operative to extract heat from the helium. 13. The system of claim 1, wherein electricity generated by the generator is supplied to a solid oxide electrolyzer cell to facilitate electrolysis of steam to hydrogen. 14. The system of claim 13, wherein the amount of electricity generated is about 8,000 to about 15,000 kilojoules per kilogram of steam generated. 15. The system of claim 1, wherein the system does not export or import electricity or steam from or to an external source. 16. The system if claim 1, wherein the turbine is a helium turbine and wherein the compressor is a helium compressor.