15.—(1) The Department may, with the agreement of the Department of the Environment, exempt the Executive from the requirement to arrange for the preparation of an external emergency plan under regulation 13(1) where, taking into account the information contained in the safety report for the relevant establishment, the Department is of the opinion that the establishment is incapable of creating a major accident hazard outside the establishment.
(2) An exemption granted by the Department under paragraph (1) shall be in writing and state the reasons for granting it.
(3) The Department may, with the agreement of the Department of the Environment, withdraw an exemption granted under paragraph (1) by specifying, in writing, the date on which the exemption will cease to apply and the date by which an external emergency plan shall be prepared.