Patent Number: 054208971
Section: claims

1. A fast reactor comprising: a core composed of nuclear fuel;  a core barrel surrounding an outer periphery of the core;  an annular reflector surrounding an outer periphery of the core barrel;  a partition wall structure surrounding an outer periphery of the annular reflector and supporting the core barrel by a supporting structure arranged radially of the fast reactor, said partition wall structure constituting an inner wall of a coolant passage for a primary coolant;  a neutron shield surrounding an outer periphery of the partition wall structure and disposed in the coolant passage;  a reactor vessel surrounding an outer periphery of the neutron shield and having an inner wall constituting an outer wall of the coolant passage; and  a guard vessel surrounding an outer periphery of the reactor vessel.  core composed of nuclear fuel;  core barrel surrounding an outer periphery of said core;  an annular reflector surrounding an outer periphery of said core barrel;  a partition wall structure surrounding an outer periphery of said annular reflector and supporting said core barrel by a supporting structure arranged radially of said fast reactor, said partition wall structure constituting an inner wall of a coolant passage for a primary coolant;  a neutron shield surrounding an outer periphery of said partition wall structure and disposed in said coolant passage;  a reactor vessel surrounding an outer periphery of said neutron shield and having an inner wall constituting an outer wall of said coolant passage; and  a guard vessel surrounding an outer periphery of said reactor vessel;  wherein said core is supported by a base plate disposed within said reactor vessel.  a core composed of nuclear fuel;  a core barrel surrounding an outer periphery of said core;  an annular reflector surrounding an outer periphery of said core barrel;  a partition wall structure surrounding an outer periphery of said annular reflector and supporting said core barrel by a supporting structure arranged radially of said fast reactor, said partition wall structure constituting an inner wall of a coolant passage for a primary coolant;  a neutron shield surrounding an outer periphery of said partition wall structure and disposed in said coolant passage;  a reactor vessel surrounding an outer periphery of said neutron shield and having an inner wall constituting an outer wall of said coolant passage;  a guard vessel surrounding an outer periphery of said reactor vessel; and  an annular electromagnetic pump, an annular intermediate heat exchanger and a decay heat removal coil arranged in series in said coolant passage, wherein said reflector is suspended from and supported by an upper structure of said fast reactor at a portion inside said electromagnetic pump and said intermediate heat exchanger.  a core composed of nuclear fuel;  a core barrel surrounding an outer periphery of said core;  an annular reflector surrounding an outer periphery of said core barrel;  a partition wall structure surrounding an outer periphery of said annular reflector and supporting said core barrel by a supporting structure arranged radially of said fast reactor, said partition wall structure constituting an inner wall of a coolant passage for a primary coolant;  a neutron shield surrounding an outer periphery of said partition wall structure and disposed in said coolant passage;  a reactor vessel surrounding an outer periphery of said neutron shield and having an inner wall constituting an outer wall of said coolant passage;  a guard vessel surrounding an outer periphery of said reactor vessel; and  an annular electromagnetic pump, an annular intermediate heat exchanger and a decay heat removal coil arranged in series in said coolant passage, wherein said reflector is suspended from and supported by an upper structure of said fast reactor at a portion inside said electromagnetic pump and said intermediate heat exchanger,  and wherein said core is supported by a base plate disposed within said rector vessel. 2. A fast reactor according to claim 1, wherein said reflector is supported to be movable along an axial direction of the fast reactor and divided into a plurality of reflector sections in the radial direction of the fast reactor. 3. A fast reactor according to claim 1, wherein said neutron shield is composed of a plurality of annular columns with spaces from each other so as to pass the primary coolant therein. 4. A fast reactor according to claim 1, wherein said neutron shield is composed of an annular member having multi-wall structure with space from adjacent walls so as to pass the primary coolant therethrough. 5. A fast reactor according to claim 1, wherein an annular electromagnetic pump, an annular intermediate heat exchanger and a decay heat removal coil are arranged in series in the coolant passage and said reflector is suspended from and supported by an upper structure of the fast reactor at a portion inside the electromagnetic pump and the intermediate heat exchanger. 6. A fast reactor according to claim 5, wherein said electromagnetic pump and said intermediate heat exchanger are constructed integral with the upper structure of the fast reactor, said partition wall structure stands upwards from a lower structure of the fast reactor, and a seal bellows is disposed between a lower portion of the integral structure of the electromagnetic pump and an upper portion of the partition wall structure in an installed state of the fast reactor. 7. A fast reactor according to claim 1, further comprising an annular electromagnetic pump and an annular intermediate heat exchanger. 8. A fast reactor according to claim 1, wherein said core comprises plutonium. 9. A fast reactor according to claim 1, wherein said primary coolant comprises liquid sodium. 10. A fast reactor comprising: 11. A fast reactor according to claim 10, wherein said reflector is supported to be movable along an axial direction of said fast reactor and divided into a plurality of reflector sections in the radial direction of said fast reactor. 12. A fast reactor according to claim 10, wherein said neutron shield comprises a plurality of annular columns with spaces from each other so as to pass the primary coolant therein. 13. A fast reactor according to claim 10, wherein said neutron shield comprises an annular member having a multi-wall structure with space from adjacent walls so as to pass the primary coolant therethrough. 14. A fast reactor according to claim 10, wherein an annular electromagnetic pump, an annular intermediate heat exchanger and a decay heat removal coil are arranged in series in said coolant passage, and wherein said reflector is suspended from and supported by an upper structure of said fast reactor at a portion inside said electromagnetic pump and said intermediate heat exchanger. 15. A fast reactor according to claim 14, wherein said electromagnetic pump and said intermediate heat exchanger are constructed integrally with the upper structure of said fast reactor, and wherein said partition wall structure stands upwards from a lower structure of said fast reactor, and a seal bellows is disposed between said lower portion of the integral structure of said electromagnetic pump and an upper portion of said partition wall structure. 16. A fast reactor comprising: 17. A fast reactor according to claim 16, wherein said reflector is supported to be movable along an axial direction of said fast reactor and divided into a plurality of reflector sections in the radial direction of said fast reactor. 18. A fast reactor according to claim 16, wherein said neutron shield comprises a plurality of annular columns with spaces from each other so as to pass the primary coolant therein. 19. A fast reactor according to claim 16, wherein said neutron shield comprises an annular member having a multi-wall structure with space from adjacent walls so as to pass the primary coolant therethrough. 20. A fast reactor according to claim 16, wherein said electromagnetic pump and said intermediate heat exchanger are constructed integrally with the upper structure of said fast reactor, and wherein said partition wall structure stands upwards from a lower structure of said fast reactor, and a seal bellows is disposed between said lower portion of the integral structure of said electromagnetic pump and an upper portion of said partition wall structure. 21. A fast reactor comprising: 22. A fast reactor according to claim 21, wherein said reflector is supported to be movable along an axial direction of said fast reactor and divided into a plurality of reflector sections in the radial direction of said fast reactor. 23. A fast reactor according to claim 21, wherein said neutron shield comprises a plurality of annular columns with spaces from each other so as to pass the primary coolant therein. 24. A fast reactor according to claim 21, wherein said neutron shield comprises an annular member having a multi-wall structure with space from adjacent walls so as to pass the primary coolant therethrough. 25. A fast reactor according to claim 21, wherein said electromagnetic pump and said intermediate heat exchanger are constructed integrally with the upper structure of said fast reactor, and wherein said partition wall structure stands upwards from a lower structure of said fast reactor, and a seal bellows is disposed between said lower portion of the integral structure of said electromagnetic pump and an upper portion of said partition wall structure.