# The Nuclear Installations (Prescribed Conditions and Excepted Matter) Regulations 2025, Regulation 2: Prescribed conditions


(1) The conditions prescribed under section 7C(1)(a)(iii) of the Act are that, during the lifetime of the site—
(a) the effective dose from radiation released from the site to a member of the public off site would be no greater than 1 millisievert in any 12-month period in all reasonably foreseeable circumstances and assuming no protective or mitigating actions are taken (the dose condition);
(b) the risk of criticality occurring on the site is negligible (the criticality condition).
(2) In this regulation—
(a) “Act” means the Nuclear Installations Act 1965;
(b) “effective dose” has the meaning given by section 11H(11) of the Act;
(c) “the lifetime of the site” means the period during which the site is subject to an appropriate permit.

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Source: https://www.legislation.gov.uk/uksi/2025/1171/regulation/2 (the official version)
Page: https://openlegislation.uk/nuclear-installations-prescribed-conditions-and-excepted-matter-regulations-2025/regulation-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.