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      • Fast-reacting ion-exchange resins or adsorbents especially designed or prepared for uranium enrichment using the ion exchange process, including porous macroreticular resins, and pellicular structures in which the active chemical exchange groups are limited to a coating on the surface of an inactive porous support structure, and other composite structures in any suitable form including particles or fibres. These ion exchange resins/adsorbents have diameters of 0.2 mm or less and must be chemically resistant to concentrated hydrochloric acid solutions as well as physically strong enough so as not to degrade in the exchange columns. The resins/adsorbents are especially designed to achieve very fast uranium isotope exchange kinetics (exchange rate half-time of less than 10 s) and are capable of operating at a temperature in the range of 100°C to 200°C.

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      • Cylindrical columns greater than 1 000 mm in diameter for containing and supporting packed beds of ion exchange resin/adsorbent, especially designed or prepared for uranium enrichment using the ion exchange process. These columns are made of or protected by materials (such as titanium or fluorocarbon plastics) resistant to corrosion by concentrated hydrochloric acid solutions and are capable of operating at a temperature in the range of 100°C to 200°C and pressures above 0.7 MPa (102 psi).

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      • (b) 

        specific modulus is the Young’s modulus in N/m² divided by the specific weight in N/m³ when measured at a temperature of 23 ± 2°C and a relative humidity of 50 ± 5%.
      • (c) 

        specific tensile strength is the ultimate tensile strength in N/m² divided by the specific weight in N/m³ when measured at a temperature of 23 ± 2°C and a relative humidity of 50 ± 5%.

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        • (ii) 

          drift equal to or better (less) than 0.1% per day at a standard ambient test room temperature of ± 1 K; or

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        • (ii) 

          maintain for at least 12 hours over a temperature range of ± 1 K around a standard temperature and a standard pressure:

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      • 1 

        The inside chamber dimension is that of the chamber in which both the working temperature and the working pressure are achieved and does not include fixtures. That dimension will be the smaller of either the inside diameter of the pressure chamber or the inside diameter of the insulated furnace chamber, depending on which of the two chambers is located inside the other.

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    • (a) 

      arc remelt and casting furnaces with consumable electrode capacities between 1 000 cm³ and 20 000 cm³ and capable of operating with melting temperatures above 1 700°C; and
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      electron beam melting and plasma atomization and melting furnaces with a power of 50 kW or greater and capable of operating with melting temperatures above 1 200°C.

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      • 2 

        For the purpose of this paragraph, accuracy includes non-linearity, hysteresis and repeatability at ambient temperature.

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    • (a) 

      designed to operate with internal temperatures of -238°C (35 K) or less;

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      • (7) 

        specified for use over an extended temperature range (-50°C to 100°C) or specified as suitable for aerospace use.

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