{
  "url": "https://openlegislation.uk/nuclear-installations-prescribed-sites-regulations-1983/regulation-2",
  "json_url": "https://openlegislation.uk/nuclear-installations-prescribed-sites-regulations-1983/regulation-2.json",
  "legislation": "uksi/1983/919",
  "legislation_title": "The Nuclear Installations (Prescribed Sites) Regulations 1983",
  "legislation_url": "https://openlegislation.uk/nuclear-installations-prescribed-sites-regulations-1983",
  "path": "regulation/2",
  "kind": "regulation",
  "number": "2",
  "heading": "Interpretation",
  "text": "In these Regulations the following expressions have the meanings hereby assigned to them, that is to say—\n“A2 values” means the values in curies specified\n(i) for single radionuclides, in paragraphs 403 to 405 of the IAEA Regulations;\n(ii) for mixed fission products, in paragraph 406 of those Regulations; and\n(iii) for a single radioactive decay chain in which the radionuclides are present in their naturally occurring proportions, in paragraph 407 of those Regulations:\n“associated nuclear fuel” means a quantity of nuclear fuel intended and ready for use or in use or which has been used in a nuclear reactor and which is held in, or on the same site as, that nuclear reactor which does not exceed the quantity of nuclear fuel specified in the nuclear site licence relating to that nuclear reactor or any consent or approval granted under that site licence;\n“fissile material” means plutonium 239, plutonium 241, uranium 233, uranium 235 (where the mass of the isotope uranium 235 exceeds 1% of the total mass of all the uranium isotopes present), or any material containing any of them:\n“form” in relation to any radionuclide means the state in which it is found on the site and in particular whether or not it is a sealed source;\n“group” in relation to radionuclides means any of the four groups into which radionuclides are classified in the Table set out in Schedule 1 to these Regulations;\n“the IAEA Regulations” means the Regulations for the Safe Transport of Radioactive Materials 1973 Revised Edition (As Amended) published by the International Atomic Energy Agency in 1979;\n“small nuclear reactor” means a thermal neutron nuclear reactor designed to operate at a thermal power output not exceeding 600KW;\n“relevant group limit ” means in relation to a radionuclide the limit in curies set out in the Table in Schedule 1 to these Regulations as being appropriate to the group to which that radionuclide belongs and in the case of a radionuclide which is in the form of a sealed source means the figure in the third column of that Table and in any other case the figure set out in the fourth column of that Table;\n“sealed source” means a radionuclide which is either sealed in a container or bonded wholly within material (otherwise than solely for the purpose of storage, transport or disposal) and includes the immediate container or bonding, but does not include any nuclear fuel element.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1983/919/regulation/2",
    "retrieved_at": "2026-10-29T18:00:47.329064+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}