Publication: Magyar Közlöny
Issue: MK-1999-95 (Year: 1999, Number: 95)
Era: 1990-2004
Section: 
Paragraph Index: 211

4. Collector system suitable for isotopic analysis. 5.7.11. Feed systems/product and tails withdrawal systems (MLIS) Especially designed or prepared process systems or equipment for enrichment plants made of or protected by materials resistant to corrosion by UF6, including: (a) Feed autoclaves, ovens, or systems used for passing UF 6 to the enrichment process (b) Desublimers (or cold traps) used to remove UF6 from the enrichment process for subsequent transfer upon heating; (c) Solidification or liquefaction stations used to remove UF6 from the enrichment process by compressing and converting UF6 to a liquid or solid form; (d) ’Product’ or ’tails’ stations used for transferring UF6 into containers. 5.7.12. UF6/carrier gas separation systems (MLIS) Especially designed or prepared process systems for separating UF6 from carrier gas. The carrier gas may be nitrogen, argon, or other gas. 1999/95. szám Explanatory note These systems may incorporate equipment such as: (a) Cryogenic heat exchangers or cryoseparators capable of temperatures of —120 ˚C or less, or (b) Cryogenic refrigeration units capable of temperatures of —120 ˚C or less, or (c) UF6 cold traps capable of temperatures of —20 ˚C or less. 5.7.13. Laser systems (AVLIS, MLIS and CRISLA) Lasers or laser systems especially designed or prepared for the separation of uranium isotopes. Explanatory note The laser system for the AVLIS process usually consists of two lasers: a copper vapor laser and a dye laser. The laser system for MLIS usually consists of a CO2 or excimer laser and a multi-pass optical cell with revolving mirrors at both ends. Lasers or laser systems for both processes require a spectrum frequency stabilizer for operation over extended periods of time. 5.8. Especially designed or prepared systems, equipment and components for use in plasma separation enrichment plants Introductory note In the plasma separation process, a plasma of uranium ions passes through an electric field tuned to the U-235 ion resonance frequency so that they preferentially absorb energy and increase the diameter of their corkscrew-like orbits. Ions with a large-diameter path are trapped to produce a product enriched in U-235. The plasma, which is made by ionizing uranium vapor, is contained in a vacuum chamber with a high-strength magnetic field produced by a superconducting magnet. The main technological systems of the process include the uranium plasma generation system, the separator module with superconducting magnet and metal removal systems for the collection of ’product’ and ’tails’. 5.8.1. Microwave power sources and antennae Especially designed or prepared microwave power sources and antennae for producing or accelerating ions and having the following characteristics: greater than 30 GHz frequency and greater than 50 kW mean power output for ion production. 5.8.2. Ion excitation coils Especially designed or prepared radio frequency ion excitation coils for frequencies of more than 100 kHz and capable of handling more than 40 kW mean power. 5.8.3. Uranium plasma generation systems Especially designed or prepared systems for the generation of uranium plasma, which may contain high-power strip or scanning electron beam guns with a delivered power on the target of more than 2.5 kW/cm. 5.8.4. Liquid uranium metal handling systems Especially designed or prepared liquid metal handling systems for molten uranium or uranium alloys, consisting of crucibles and cooling equipment for the crucibles. Explanatory note The crucibles and other parts of this system that come into contact with molten uranium or uranium alloys are made of or protected by materials of suitable corrosion and heat resistance. Suitable materials include tantalum, yttria-coated graphite, graphite coated with other rare earth oxides or mixtures thereof. 5.8.5. Uranium metal ’product’ and ’tails’ collector assemblies Especially designed or prepared ’product’ and ’tails’ collector assemblies for uranium metal in solid form. These collector assemblies are made of or protected by materials resistant to the heat and corrosion of uranium metal vapor, such as yttria-coated graphite or tantalum. 5.8.6. Separator module housings Cylindrical vessels especially designed or prepared for use in plasma separation enrichment plants for containing the uranium plasma source, radio-frequency drive coil and the ’product’ and ’tails’ collectors. Explanatory note These housings have a multiplicity of ports for electrical feed-throughs, diffusion pump connections and instrumentation diagnostics and monitoring. They have provisions for opening and closure to allow for refurbishment of internal components and are constructed of a suitable non-magnetic material such as stainless steel. 5.9. Especially designed or prepared systems, equipment and components for use in electromagnetic enrichment plants Introductory note In the electromagnetic process, uranium metal ions produced by ionization of a salt feed material (typically UCl 4) are accelerated and passed through a magnetic field that has the effect of causing the ions of different isotopes to follow different paths. The major components of an electromagnetic isotope separator include: a magnetic field for ion-beam diversion/separation of the isotopes, an ion source with its acceleration system, and a collection system for the separated ions. Auxiliary systems for the process include the magnet power supply system, the ion source high-voltage power supply system, the vacuum system, and extensive chemical handling systems for recovery of product and cleaning/recycling of components. 5.9.1. Electromagnetic isotope separators Electromagnetic isotope separators especially designed or prepared for the separation of uranium isotopes, and equipment and components therefor, including: 1999/95. szám (a) Ion sources Especially designed or prepared single or multiple uranium ion sources consisting of a vapor source, ionizer, and beam accelerator, constructed of suitable materials such as graphite, stainless steel, or copper, and capable of providing a total ion beam current of 50 mA or greater. (b) Ion collectors Collector plates consisting of two or more slits and pockets especially designed or prepared for collection of enriched and depleted uranium ion beams and constructed of suitable materials such as graphite or stainless steel. (c) Vacuum housings Especially designed or prepared vacuum housings for uranium electromagnetic separators, constructed of suitable non-magnetic materials such as stainless steel and designed for operation at pressures of 0.1 Pa or lower. Explanatory note The housings are specially designed to contain the ion sources, collector plates and water-cooled liners and have provision for diffusion pump connections and opening and closure for removal and reinstallation of these components. (d) Magnet pole pieces Especially designed or prepared magnet pole pieces having a diameter greater than 2 m used to maintain a constant magnetic field within an electromagnetic isotope separator and to transfer the magnetic field between adjoining separators. 5.9.2. High voltage power supplies Especially designed or prepared high-voltage power supplies for ion sources, having all of the following characteristics: capable of continuous operation, output voltage of 20,000 V or greater, output current of 1 A or greater, and voltage regulation of better than 0.01% over a time period of 8 hours. 5.9.3. Magnet power supplies Especially designed or prepared high-power, direct current magnet power supplies having all of the following characteristics: capable of continuously producing a current output of 500 A or greater at a voltage of 100 V or greater and with a current or voltage regulation better than 0.01% over a period of 8 hours.

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