High Level Design The High Level Design of the Petroleum Safety Framework as amended by the CER from time to time. Independent Competent Body An independent organisation engaged by the petroleum undertaking, under the Compliance Assurance System, to execute a Facilities Verification, or Well Verification Scheme. Major Accident An event, such as a major emission, fire, explosion, impact or structural failure of Petroleum Infrastructure, resulting from uncontrolled developments in the course of petroleum activities that could lead to a serious danger to human health whether immediate or delayed. Serious danger implies events which could impact multiple persons, including members of the public and/or workforce.