Ionising Radiations Regulations (Northern Ireland) 2000

Part II — Quantity Ratios for more than one Radionuclide

1

For the purpose of Regulation 2(4), the quantity ratio for more than one radionuclide is the sum of the quotients of the quantity of a radionuclide present Qp divided by the quantity of that radionuclide specified in the appropriate column of Part I of this Schedule Qlim, namely—

$ΣQpQlim$

2

In any case where the isotopic composition of a radioactive substance is not known or is only partially known, the quantity ratio for that substance shall be calculated by using the values specified in the appropriate column in Part I for ‘other radionuclides not listed above’ for any radionuclide that has not been identified or where the quantity of a radionuclide is uncertain, unless the employer can show that the use of some other value is appropriate in the circumstances of a particular case, when he may use that value.

SCHEDULE 9 — Premises and activities within territorial waters

Interpretation

1

• (1) In this Schedule—

• “designated area” means any area designated by order under section 1(7) of the Continental Shelf Act 1964[^f00030] and “within a designated area” includes over and under it;

• “offshore installation” shall be construed in accordance with paragraph 2(2) and (3);

• “stand-by vessel” means a vessel which is ready to give assistance in the event of an emergency on or near an offshore installation;

• “vessel” includes a hovercraft and any floating structure which is capable of being staffed.

• (2) For the purposes of this Schedule, any structures and devices on top of a well shall be treated as forming part of the well.

• (3) For the purposes of this Schedule, a person shall be deemed to be engaged in diving operations throughout any period from the time when he commences to prepare for diving until the time when—

• (a) he is no longer subjected to raised pressure;

• (b) he has normal inert gas partial pressure in his tissues; and

• (c) if he entered the water, he has left it,

and diving operations include the activity of any person in connection with the health and safety of a person who is, or is deemed to be, engaged in diving operations.

• (4) Any reference in this Schedule to premises and activities (howsoever described) includes a reference to any person, article or substance on those premises or engaged in or, as the case may be, used or for use in connection with any such activity but does not include a reference to an aircraft which is airborne.

Offshore installations

2

• (1) This paragraph applies to—

• (a) any offshore installation and any activity on it;

• (b) any activity, including diving operations, in connection with an offshore installation, or any activity which is immediately preparatory thereto, whether carried on from the installation itself, on or from a vessel or in any other manner, other than—

• (i) transporting, towing or navigating the installation; or

• (ii) any activity on or from a vessel being used as a stand-by vessel; or

• (c) diving operations involving the survey and preparation of the sea bed for an offshore installation.

• (2) Subject to sub-paragraph (3), in this Schedule “offshore installation” means a structure which is, or is to be, or has been, used while standing or stationed in water, or on the foreshore or other land intermittently covered with water—

• (a) for the exploitation, or exploration with a view to exploitation, of mineral resources by means of a well;

• (b) for the storage of gas in or under the shore or bed of any water or the recovery of gas so stored;

• (c) for the conveyance of things by means of a pipe; or

• (d) mainly for the provision of accommodation for persons who work on or from a structure falling within any of the provisions of this sub-paragraph, and which is not an excepted structure.

• (3) For the purposes of sub-paragraph (2), the excepted structures are—

• (a) a structure which is connected with dry land by a permanent structure providing access at all times and for all purposes;

• (b) a well;

• (c) a structure which has ceased to be used for any of the purposes specified in sub-paragraph (2) and has since been used for a purpose not so specified;

• (d) a mobile structure which has been taken out of use and is not for the time being intended to be used for any of the purposes specified in sub-paragraph (2); and

• (e) any part of a pipeline.

Wells

3

• (1) This paragraph applies to—

• (a) a well and any activity in connection with it; or

• (b) an activity which is immediately preparatory to any activity in head (a).

• (2) Sub-paragraph (1) includes keeping a vessel on station for the purpose of working on a well but otherwise does not include navigation or an activity connected with navigation.

Pipelines

4

• (1) This paragraph applies to—

• (a) a pipeline;

• (b) any pipeline works; or

• (c) any of the following activities in connection with pipeline works—

• (i) the loading, unloading, fuelling or provisioning of a vessel;

• (ii) the loading, unloading, fuelling, repair and maintenance of an aircraft on a vessel,

being in either case a vessel which is engaged in pipeline works.

• (2) In this paragraph—