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EU Code

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Prohibited Supply To

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Notes

• Fluorination systems (molecular based methods) Especially designed or prepared systems for fluorinating UF 5 (solid) to UF 6 (gas). EXPLANATORY NOTE These systems are designed to fluorinate the collected UF 5 powder to UF 6 for subsequent collection in product containers or for transfer as feed for additional enrichment. In one approach, the fluorination reaction may be accomplished within the isotope separation system to react and recover directly off the ‘product’ collectors. In another approach, the UF 5 powder may be removed/transferred from the ‘product’ collectors into a suitable reaction vessel (e.g., fluidized-bed reactor, screw reactor or flame tower) for fluorination. In both approaches, equipment for storage and transfer of fluorine (or other suitable fluorinating agents) and for collection and transfer of UF 6 are used.
• UF 6 /carrier gas separation systems (molecular based methods) Especially designed or prepared process systems for separating UF 6 from carrier gas. EXPLANATORY NOTE These systems may incorporate equipment such as: (a) Cryogenic heat exchangers or cryoseparators capable of temperatures of 153 K (– 120 °C) or less, or (b) Cryogenic refrigeration units capable of temperatures of 153 K (–120 °C) or less, or (c) UF 6 cold traps capable of freezing out UF 6 . The carrier gas may be nitrogen, argon, or other gas.
• Rotary shaft seals (molecular based methods)Especially designed or prepared rotary shaft seals, with seal feed and seal exhaust connections, for sealing the shaft connecting the compressor rotor with the driver motor so as to ensure a reliable seal against out-leakage of process gas or in-leakage of air or seal gas into the inner chamber of the compressor which is filled with a UF6/carrier gas mixture.
• UF 6 /carrier gas compressors (molecular based methods) Especially designed or prepared compressors for UF 6 /carrier gas mixtures, designed for long term operation in a UF 6 environment. The components of these compressors that come into contact with process gas are made of or protected by materials resistant to corrosion by UF 6 .
• ‘Product’ or ‘tails’ collectors (molecular based methods) Especially designed or prepared components or devices for collecting uranium product material or uranium tails material following illumination with laser light. EXPLANATORY NOTE In one example of molecular laser isotope separation, the product collectors serve to collect enriched uranium pentafluoride (UF 5 ) solid material. The product collectors may consist of filter, impact, or cyclone-type collectors, or combinations thereof, and must be corrosion resistant to the UF 5 / UF 6 environment.
• Supersonic expansion nozzles (molecular based methods) Especially designed or prepared supersonic expansion nozzles for cooling mixtures of UF 6 and carrier gas to 150 K (–123 °C) or less and which are corrosion resistant to UF 6 .
• Laser systems Lasers or laser systems especially designed or prepared for the separation of uranium isotopes. EXPLANATORY NOTE The lasers and laser components of importance in laser-based enrichment processes include those identified in INFCIRC/254/Part 2 — (as amended). The laser system typically contains both optical and electronic components for the management of the laser beam (or beams) and the transmission to the isotope separation chamber. The laser system for atomic vapour based methods usually consists of tunable dye lasers pumped by another type of laser (e.g., copper vapour lasers or certain solid-state lasers). The laser system for molecular based methods may consist of CO 2 lasers or excimer lasers and a multi-pass optical cell. Lasers or laser systems for both methods require spectrum frequency stabilization for operation over extended periods of time.