12.—(1) Subject to paragraph (2), every employer must ensure that its employees and other persons within a class specified in Schedule 3 are not exposed to ionising radiation to an extent that any dose limit specified in Part 1 of that Schedule for such class of person is exceeded in any calendar year.
(2) Where an employer is able to demonstrate to the appropriate authority that, in respect of an employee, the dose limit specified in paragraph 1 of Part 1 of Schedule 3 is impracticable having regard to the nature of the work undertaken by that employee, the appropriate authority may in respect of that employee authorise the employer to apply the dose limits set out in paragraphs 8 or 9 of Schedule 3 and in such case the provisions of Part 2 of that Schedule will have effect.
(3) The steps taken by a relevant employer to comply with paragraph (1) in respect of members of the public must include an estimation of doses to members of the public from the relevant practice or practices carried out by the relevant employer in accordance with requirements regarding the estimation of doses as approved by the Executive from time to time.
(4) In this regulation—
“appropriate authority” means—
in relation to any activity carried out exclusively or primarily on nuclear premises, the ONR;
otherwise, the Executive;
“relevant employer” means an employer who is carrying out, or who intends to carry out, a relevant practice;
“relevant practice” means a practice to which regulation 6 or 7 applies.