Section 18

No person shall accumulate any radioactive waste on any premises without the prior approval in writing of the Director.

Any approval given by the Director under this section may be subject to such conditions as the Director may see fit to impose.

Where the disposal of any radioactive waste has been authorised under section 17 and in accordance with that authorisation, the waste is required or permitted to be accumulated with a view to subsequent disposal thereof, no further authorisation under this section shall be required to enable the waste to be accumulated in accordance with the authorisation granted under section 17.

For the purposes of this section, where radioactive material is produced, kept or used on any premises and any substance arising from the production, keeping or use of that material is accumulated in any part of the premises appropriated for the purpose, and is retained there for a period of not less than 3 months, that substance shall, unless the contrary is proved, be presumed —