摘要:
A mobile boration system (60) has a number of components that are mobile and include a water source (10), H2B03 powder supply (14), a mixer to mix the solution (20) capable of providing a boric acid solution (30) with minimal air entrainment and optional heat exchanger(s) (12), and wherein the system (60) is capable of transport to a nuclear power plant facility by land, sea or air, rather than being in place in a large vulnerable footprint.
摘要:
A system for storing nuclear fuel assemblies includes a plurality of cells housed within a support structure. A first cell may house a first fuel assembly and a second cell may house a second fuel assembly. A plurality of compartments separate the plurality of cells and provide passageways for coolant entering a bottom end of the support structure to remove heat from the nuclear fuel assemblies. A first perforation transfers coolant between the first cell and one or more of the compartments, and a second perforation transfers coolant between the second cell and the one or more compartments. At least a portion of the coolant entering the bottom end of the support structure is transferred between the plurality of cells and the plurality of compartments. Two or more fuel storage racks may be stacked together in alternating fuel patterns to facilitate cooling the fuel assemblies with liquid or air.
摘要:
A method of storing nuclear fuel is described. In some cases, the method includes submerging at least a portion of a nuclear fuel rod in a storage pool containing an aqueous solution including at least one of polyhedral boron hydride anions or carborane anions. In some cases, the method includes adding a salt having a polyhedral boron hydride anion or carborane anion to a storage pool containing water and at least a portion of a nuclear fuel rod submerged in it. The method may include both of these. A storage pool is also described. The storage pool includes an aqueous solution having at least one of polyhedral boron hydride anions or carborane anions with at least a portion of a nuclear fuel rod submerged in the aqueous solution. A method of servicing a nuclear reactor core is also described.
摘要:
This boron-containing aluminum material is obtained by carrying out the following: a mixed powder, obtained by mixing a boride powder containing first boride particles, second boride particles and particles of unavoidable impurities with an aluminum powder or aluminum alloy powder that forms a matrix, is filled in a square aluminum pipe having a prescribed shape and then rolled by using pressure rolls the gap between which is adjusted.
摘要:
A spent nuclear fuel rod canister includes a submersible pressure vessel including a casing that defines an interior cavity, the casing including a corrosion resistant and heat conductive material with a thermal conductivity of above about 7.0 watts per meter per kelvin; and a rack enclosed within the interior cavity and configured to support one or more spent nuclear fuel rods.
摘要:
A system for storing nuclear fuel, the system including a storage rack and a bearing pad. The storage rack includes an array of cells, each cell configured to receive and store nuclear fuel rods, a base plate configured to support the array of cells, and a support structure configured to support the base plate and to allow cooling fluid to circulate under and up through apertures in the base plate. The bearing pad is coupled to the support structure and is configured to limit lateral movement of the storage rack independent from lateral movement of the bearing pad. The base plate defines a base plate profile in a horizontal plane of the base plate, and the bearing pad defines a bearing pad profile in the horizontal plane of the base plate, wherein the bearing pad profile extends outside of the base plate profile.
摘要:
A high-density fuel rack and system for wet storage of radioactive fuel, assemblies, such as spent nuclear fuel. The fuel rack includes a grid array of elongated cells each con figured for holding a fuel assembly, in one aspect, the cells are formed by a plurality of longitudinally- extending tubes having a rectilinear polygonal cross-sectional configuration. In one embodiment, the cells may have a cross-sectional shape of unequal width and length. The tubes may be variously arranged in contiguous or spaced apart configurations for non-flux trap and flux trap type racks, respectively.
摘要:
Die Erfindung betrifft ein Brennelementlagerbecken mit Kühlsystem (10), wobei das Kühlsystem wenigstens einen ersten Wärmetauscher (14, 16, 52), der im Brennelementlagerbecken (12) angeordnet ist, und wenigstens einen zweiten Wärmetauscher (18, 20, 54), der in einer davon entfernten Wärmesenke oberhalb (28, 68) des höchsten Punktes (24, 64) des ersten Wärmetauschers (14, 16, 52) angeordnet ist, umfasst. Beide Wärmetauscher (14, 16, 18, 20, 52, 54) sind mit einem Rohrsystem (30, 32, 60, 62) zu einem geschlossenen Kreislauf (50) verbunden, welcher zumindest teilweise mit einem strömfähigen Kühlmittel (56, 58) gefüllt ist. Bei einer gegenüber dem zweiten Wärmetauscher (18, 20, 54) erhöhten Temperatur des ersten Wärmetauschers (14, 16, 52) ist somit ohne Pumpvorrichtung ein Naturumlauf des Kühlmittels (56, 58) und damit ein Wärmetransport (34, 36; 70, 72) vom Brennelementlagerbecken (12) zur Wärmesenke gewährleistet.
摘要:
A cast composite material is prepared by furnishing an aluminum-based matrix alloy and forming a mixture of free-flowing boron carbide particles and the aluminum-based matrix alloy in molten form which is stirred to wet the matrix alloy to the boron carbide particles and to distribute the particles throughout the volume of the melt. The molten mixture is then cast. The fluidity of the molten mixture is maintained by (a) maintaining the magnesium content of the matrix metal below about 0.2 % by weight, or (b) starting with a matrix metal containing less than 0.2 % by weight magnesium and adding further magnesium to the mixture a short time before casting, or (c) having at least 0.2 % by weight titanium present in the mixture.