Abstract:
A reactor vessel includes a plenum and a reactor core with first and second sets of channels. A blanket salt flows through the first set of channels, and a fuel salt flows through the second set of channels. The plenum receives the blanket salt from the first set of channels. The blanket salt provides a breed-stock for a fission reaction in the fuel salt and transfers heat generated by the fission reaction without mixing with the fuel salt.
Abstract:
A nuclear reactor (100) is disclosed that includes a reactor core (102) and a reflector assembly (150) that surrounds the reactor core. The reflector assembly includes a stationary reflector component (152) that includes a graphite support structure (156) including a plurality of channels (158) defined therein and a plurality of beryllium-oxide pins (160) positioned in the channels.
Abstract:
A nuclar reactor including a combination of a fissionable material, a molten salt, and a moderator material including one or more hydrides, one or more deuterides, or a combination of two or more of them.
Abstract:
This miniature neutron generator is for active detection of highly enriched uranium using a movable detection system. It is a small size, lightweight, low power consumption neutron generator with ease of operation and maintenance. The detector is based on a simplified ion source and ion transport system.
Abstract:
Assemblage porteur pour réacteur nucléaire comportant un boîtier (40), une zone fissile située en partie basse du boîtier (40), un volume libre situé en partie haute du boîtier (40), un espace libre (52) dans la zone fissile s'étendant sur la hauteur de la zone fissile à partir de son extrémité située du côté de la partie haute le long de l'axe longitudinal, un fourreau (54) bordant l'espace libre (52), et un système de déclenchement et d'insertion (SI), ledit système de déclenchement et d'insertion comportant une capsule (10) d'axe longitudinal, un ensemble absorbant (2) et/ou mitigateur suspendu dans la capsule et un dispositif de déclenchement et d'insertion (DI) apte à libérer ledit ensemble absorbant en cas d'état accidentel de l'assemblage, ladite capsule (10) étant insérée dans le fourreau (54) ledit système de déclenchement et d'insertion étant monté de manière amovible dans l'assemblage porteur.
Abstract:
A nuclear reactor can include a pressure vessel for containing a pressurized moderator at a first pressure. The nuclear reactor can also include a plurality of fuel channels for a coolant fluid at a second pressure. The plurality of fuel channels are fluidly connected at inlet ends thereof to a coolant supply conduit and are adapted to receive nuclear fuel bundles and to be mounted within the pressure vessel and surrounded by the moderator. The outlet ends of the fuel channels are fluidly connected to a coolant outlet conduit to enable the coolant fluid to circulate from the coolant supply conduit through the fuel channels to the coolant outlet conduit. The plurality of fuel channels maintain separation between the coolant fluid circulating within the fuel channels and the moderator.
Abstract:
Seed-blanket type nuclear reactor cores (10, 100) are employed to burn thorium fuel with conventional reactor fuels, including nonproliferative enriched uranium, and weapons or reactor grade plutonium. In a first embodiment, the core (10) is completely nonproliferative in that neither the reactor fuel, nor the generated waste material, can be used to manufacture nuclear weapons. In a second embodiment of the invention, the core (100) is employed to burn large amounts of weapons grade plutonium with the thorium, and provides a convenient mechanism by which stockpiled weapons grade plutonium can be destroyed and converted into electrical energy. The cores of both embodiments are comprises of a plurality of seed-blanket units (12, 102) which have centrally located seed regions (18, 104) that are surrounded by annular blanket regions (20, 106). The seed regions contain the uranium or plutonium fuel rods (22, 110), while the blanket regions contain thorium fuel rods (26, 118).
Abstract:
An enhanced architecture for a nuclear reactor core includes several technologies: (1) nuclear fuel tiles (S-Block); and (2) a high-temperature thermal insulator and tube liners with a low-temperature solid-phase moderator (U-Mod) to improve safety, reliability, heat transfer, efficiency, and compactness. In S-Block, nuclear fuel tiles include a fuel shape designed with an interlocking geometry pattern to optimize heat transfer between nuclear fuel tiles and into a fuel coolant and bring the fuel coolant in direct contact with the nuclear fuel tiles. Nuclear fuel tiles can be shaped with discontinuous nuclear fuel lateral facets and have fuel coolant passages formed therein to provide direct contact between the fuel coolant and the nuclear fuel tiles. In U-Mod, tube liners with low hydrogen diffusivity retain hydrogen in the low-temperature solid- phase moderator even at elevated temperatures and the high-temperature thermal insulator insulates the solid-phase moderator from the nuclear fuel tiles.
Abstract:
A thermal exchange system (1) with passive regulation of the amount of heat removed, in particular for a nuclear reactor, comprises an evaporating-condensing circuit (3), in which a condensable secondary fluid (4) circulates via which heat is removed from a primary fluid (2) by means of evaporation and subsequent condensation of the secondary fluid (4) in a main heat exchanger (11) and an auxiliary heat exchanger (12) respectively; and a passive regulation device (5), configured so as to passively regulate the thermal power removed by condensation by the auxiliary heat exchanger (12), matching it with the thermal power removed from the primary fluid (2) by means of incondensable gas injection into the evaporating- condensing circuit (3). A thermal exchange system (1) with passive regulation of the amount of heat removed, in particular for a nuclear reactor, comprises an evaporating-condensing circuit (3), in which a condensable secondary fluid (4) circulates via which heat is removed from a primary fluid (2) by means of evaporation and subsequent condensation of the secondary fluid (4) in a main heat exchanger (11) and an auxiliary heat exchanger (12) respectively; and a passive regulation device (5), configured so as to passively regulate the thermal power removed by condensation by the auxiliary heat exchanger (12), matching it with the thermal power removed from the primary fluid (2) by means of incondensable gas injection into the evaporating- condensing circuit (3).
Abstract:
A nuclear reactor core comprising fissile material is surrounded by a core former. The core former comprises one or more single-piece annular rings wherein each single-piece annular ring comprises neutron-reflecting material. In some embodiments the core former comprises a stack of two or more such single-piece annular rings. In some embodiments the stack of single-piece annular rings is self-supporting. In some embodiments the stack of single-piece annular rings does not include welds or fasteners securing adjacent single-piece annular rings together. A core basket may contain the nuclear reactor core and the core former, and in some embodiments an annular gap is defined between the core former and the core basket. In some embodiments the core former does not include welds and does not include fasteners.