Category Archives: NUCLEAR CHEMICAL ENGINEERING

The South African UCOR Process

History. The UCOR process, developed by the Uranium Enrichment Corporation of South Africa, has been operated on a large pilot-plant scale at Valindaba, Union of South Africa. Partial information on the process, its separation factor and specific power demand, and its projected economics was given by Roux and Grant [R3]. The ingenious Helikon cascade technique developed for this process, in […]

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Two-Up, One-Down Ideal Cascade

This type of cascade may have practical application in a Becker nozzle plant or centrifuge plant for producing low-enriched uranium, with individual stages operated at a cut of around Figure 12.26 is a schematic diagram of stage connections showing the nomenclature to be used in solving the enrichment equations for such a cascade. Olander [01] has solved the enrichment equations […]

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Laser Isotope Separation of Uranium Metal Vapor

Absorption spectrum of uranium metal vapor. The absorption spectrum of uranium metal vapor is very complex, with over 300,000 lines at visible wavelengths. However, many of these absorption lines are very sharp, with sufficient displacement between a 23aU absorption line and the MSU absorption line for the corresponding transition, and without overlap of the 23 line with the «’U line […]

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STABLE ISOTOPES: USES, SEPARATION METHODS, AND SEPARATION PRINCIPLES

Although the isotopes of an element have very similar chemical properties, they behave as completely different substances in nuclear reactions. Consequently, the separation of isotopes of certain elements, notably 235 U from 238 U and deuterium from hydrogen, is of great importance in nuclear technology. The fact that isotopes of an element have such similar gross physical and chemical properties, […]

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Operating Procedure during Start-up

Figure 12.23 shows the nomenclature to be used in describing the operation of an isotope separation plant during the transient period in which it is approaching steady-state performance. Figure 12.24 represents qualitatively the way tails and product flow rates and compositions will change with time during this transient period. Compositions are represented by a scale linear in In [x/(l -*)].

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