Core, axial blanket fuel assembly

To determine the process size, material balances were calculated for each process operation. Feed to the process was one core-axial blanket fuel assembly. 

AI Reference Oxide LMFBR Core-Axial Blanket Fuel Assembly (21)... 

The block flow diagram presented in Figure 2 gives the major operations of the conceptual process. Feed to the process is one core-axial blanket or radial blanket fuel assembly. The fuel assembly hardware below the active section is removed prior to processing. The hardware above the active section is not introduced into the process. In this low decontamination process, the active section of the spent fuel is selectively dissolved into molten metals and molten salts from which coprocessing of uranium and... 

Figure 5.2 shows a typical core fuel element (also called a fuel pin) and fuel assembly (also called a fuel subassembly). The core fuel element contains the core fuel, upper and lower axial blanket fuels, and a space called the fission gas plenum within a cladding tube. Then they are assembled as a fuel element bundle. The fuel assembly contains the fuel element bundle in a hexagonal assembly duct called a wrapper tube. 

Fuel assemblies for the core and axial blanket consist of long bundles of stainless steel tubes, each about 0.6 cm in diameter, in which the spent fuel and fission products are sealed. 

Cr - 0.00343 and Ni - 0.00149 in uhits of 10 at./cm. This represents a homogenization of typical numbers of uranium-fueled driver subassembUes, eityer-imental fueled-subassemblies, experimental istructural-subassemblies, and control-safety subassemblies. The 17.5-in.-thick radial blanket has atom densities of U-0.0265 Na-0.00456 Fe-0.00964 Cr-Q.00254 and Nl-0.00111. The 13-in. core height of the assembly is axially reflected at top and bottom by sodium mid stainless steel contained in gaps and reflectors. The eiq ri-mental critical mass is 200 kg including ab estimated correction for excess reactivity. ... 

The fourth type of fuel assembly is used in the lateral blanket. Mixed uranium-plutonium nitride fuel with a density of 13.3 g/cm and plutonium content of 13.7 % is used in all core zones. Axial and lateral blankets contain pellets of depleted uranium nitride with a density of 13.3 g/cm (Table XXIII-7). 

The core consists of driver fuel assemblies, internal blanket assemblies, radial blanket assemblies, control rods, ultimate shutdown system (USS) assembly, gas expansion modules (OEMs), reflector assemblies, B4C shield assemblies, shield assemblies, and in-vessel storages (IVSs). There are no upper or lower axial blankets surrounding the core. A fission gas plenum is located above the fuel slug and sodium bond. The bottom of each fuel pin is a solid rod end plug for axial shielding. The reflector assemblies contain solid Inconel-600 rods. The control assemblies use a sliding bundle and a dashpot assembly within the same outer assembly structure as the other assembly types. 

ZPPR Assembly 2 is toe first assembly in toe overall prosram. It is a clean version of a generalized demonstration reactor configuration. It is a two-zone plutonium, uranium), Oi-fueled core, with a 60/50 volume split between the two zones, and a ratio of plutonium contents of 1,5 tetween toe outer and inner zones. The axial ajid radial blankets have appropriate volume fractious of depleted UOi and sodium, and are surrounded, in turn, by a steel reflector. 

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