|Author||Golubev, V. I. ♦ Zvonarev, A. V. ♦ Nikolaev, M. N. ♦ Orlov, M. Yu.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||REACTOR TECHNOLOGY ♦ ABSORPTION ♦ ALLOYS ♦ BERYLLIUM ♦ BETA DECAY ♦ BLANKETS ♦ BR-1 ♦ BREEDING ♦ BUCKLING ♦ CAPTURE ♦ CHEMICAL REACTIONS ♦ CONFIGURATION ♦ COPPER ♦ CROSS SECTIONS ♦ DISTRIBUTION ♦ ECONOMICS ♦ EFFICIENCY ♦ ENERGY ♦ ENERGY RANGE ♦ FAST NEUTRONS ♦ FERTILE MATERIALS ♦ FISSION PRODUCTS ♦ INTERACTIONS ♦ IRON ♦ LAYERS ♦ LOSSES ♦ MATERIALS TESTING ♦ MEASURED VALUES ♦ MECHANICAL PROPERTIES ♦ MODERATORS ♦ NEUTRON FLUX ♦ NICKEL ♦ POWER PLANTS ♦ PRODUCTION ♦ RADIOACTIVITY ♦ REACTOR CORE ♦ REFLECTORS ♦ RESEARCH REACTORS ♦ RESONANCE NEUTRONS ♦ SCATTERING ♦ SEPARATION PROCESSES ♦ SLOWDOWN ♦ SPECTRA ♦ STAINLESS STEELS ♦ THICKNESS ♦ URANIUM ♦ URANIUM 238 ♦ URANIUM 239 ♦ VARIATIONS ♦ WATER ♦ ZONES|
|Abstract||It was found expedient to surround the fertile region of a fast-breeder reactor with a supplementary reflector, in order to reduce the neutron leakage. The material of this reflector must have a high scattering cross section and a relatively low absorption cross section while possessing satisfactory moderating and technical properties, without being unduly expensive. The problem was experimentally investigated with the BR-I reactor. The changes in the number of neutron captures in the fertile zone as the supplementary reflector attached to the depleted U shield was changed were determined. The effect of the various materials was compared at the so-called asymptotic spectrum'' region (A. I. Leipunskii, Atomn. Energ., 5: 277 (1958)). Layers of various thicknesses of Ni, Fe, Cu, stainless steel, Be, and water were placed next to the 57-cm thick U/sup 238/ shield and the radiative neutron capture density near the boundary was determined by the BETA activity of U/sup 239/; the decay and fission products were removed chemically before the measurements. It was found that Fe is the least suitable material because of the deep interference dips in its cross section curve in the resonance energy range. Addition of other elements to the Fe, as in the case of stainless steel, results in the coalescence of the dips, making the alloy more suitable for use as a supplementary reflector. Ni and H/ sub 2/O were found to be satisfactory, as they reduced the leakage by a factor of 2. As expected, Be was found to be the best material, but its high cost is a limiting factor. (TTT)|
|Learning Resource Type||Article|
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