(1) Within the period of registration of a major hazard facility, the operator may apply for a variation to the registration expiry date, for the purpose of extending the period of registration.
(2) The Authority may grant a variation extending the period of registration if—
(a) it is satisfied that —
(i) in the case of a facility registered under regulation 515, there has been a change in the planned date of completion; and
(ii) the matters specified in regulation 470 are likely to be achieved before the end of the extended period of registration; and
(b) the period is extended to a date no later than 36 months after—
(i) subject to subparagraph (ii), the original date of completion or alteration of the facility or proposed major hazard facility; or
(ii) if a major hazard facility has been determined under regulation 363 or 364, the date on which the determination took effect.