These amendments refer to:

  • Capturing tritium removal from both water and heavy water (upgraders) and clarifies that the controlled platinised catalysts are wet-proofed. These changes reduce the scope of the control and only captures platinised catalysts used in hydrogen isotope exchange reactions for the recovery of tritium and for the production or upgrading of heavy water.
  • The range of diameters of composite structures in the form of tubes to be consistent with changes made during the Dedicated Meeting of Technical Experts (DMTE) (2010-2013) and during the 2022 Plenary.
    As a result of a complete revision of both NSG lists in 2010-2013, completed by the DMTE, the maximum diameter of gas centrifuges was changed from 400 mm to 650 mm in Sections 5.1, 5.1.1 of Annex B of the Part 1 Guidelines.
    This amendment ensures the coverage of composite structures in the form of tubes that can be used for gas centrifuge rotors are harmonized with the control parameters of the centrifuges. In addition, a new thickness parameter of 12 mm has also been added to only control thin-walled tubes.
  • Account for new heavy water production techniques and to update some control parameters. Specifically, the new text amends the outlet temperatures and the internal pressure range along with clarifying the materials of construction.
    Additionally, a new technical note 2 was added to provide examples of equivalent materials of construction that are both cryogenic and hydrogen compatible within the updated temperature range.

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