Class II Nuclear Facilities and Prescribed Equipment Regulations

19 (1) Every licensee who possesses, uses or produces, in or for Class II prescribed equipment, either a sealed source containing 50 MBq or more of a nuclear substance or a nuclear substance as shielding shall, at the following times, conduct leak tests on the sealed source or shielding using instruments and procedures that enable the licensee to detect a leakage of 200 Bq or less of the nuclear substance:

• (a) where the sealed source or shielding is used after being stored for 12 or more consecutive months, immediately before using it;

• (b) where the sealed source or shielding is being stored, every 24 months;

• (c) where an event that may have damaged the sealed source or shielding has occurred, immediately after the event; and

• (d) in all other cases,

  • (i) where the sealed source or shielding is located in Class II prescribed equipment, every 12 months, and

  • (ii) where the sealed source or shielding is not located in Class II prescribed equipment, every six months.

(2) Where a licensee, in the course of conducting a leak test on a sealed source or on shielding, detects the leakage of 200 Bq or more of a nuclear substance, the licensee shall

• (a) discontinue using the sealed source or shielding;

• (b) discontinue using the Class II prescribed equipment in which the sealed source or shielding is located or may have been located;

• (c) take measures to limit the spread of radioactive contamination from the sealed source or shielding; and

• (d) immediately after complying with paragraphs (a) to (c), notify the Commission that the leakage has been detected.