5.—(1) The duty holder shall ensure that the designs to which an installation is to be or in the event is constructed are such that, so far as is reasonably practicable—
(a)it can withstand such forces acting on it as are reasonably foreseeable;
(b)its layout and configuration, including those of its plant, will not prejudice its integrity;
(c)fabrication, transportation, construction, commissioning, operation, modification, maintenance and repair of the installation may proceed without prejudicing its integrity;
(d)it may be decommissioned and dismantled safely; and
(e)in the event of reasonably foreseeable damage to the installation it will retain sufficient integrity to enable action to be taken to safeguard the health and safety of persons on or near it.
(2) The duty holder shall ensure that an installation is composed of materials which are—
(a)suitable, having regard to the requirement in regulation 4; and
(b)so far as is reasonably practicable, sufficiently proof against or protected from anything liable to prejudice its integrity.