[en] These Regulations establish and require the maintenance of security systems, equipment and procedures to implement Canada's international obligations regarding security at those nuclear facilities. The Regulations, which determine the different areas in a nuclear facility, provide for the establishment of security barriers around the ''protected areas'' occupied by facilities and prescribe that the licensees (operators) are required to keep the facilities for which they hold a licence under constant surveillance. They must also make arrangements for a response force - a local, provincial or federal police force detachment or similar force - to provide assistance where necessary. No person may enter a protected area without written authorization from the licensee concerned. Inspectors appointed under the Atomic Energy Control Regulations or designated under an agreement between Canada and the IAEA may be granted an authorization to enter such areas to discharge their duties. The Regulations have been amended by SOR/84-81 of 12 January 1988 to add certain requirements concerning documentary evidence and the duties of the board; by SOR/85-1016 of 25 October 1985 to revise the definition of response force and provide other clarifications; by SOR/91-585 of 10 October 1991 to clarify wording in French. (NEA)