The explosion at BP's Texas city (March, 2005), macondo deepwater horizon blowout (April 2010), an Olefins Plant reboiler rupture and fire (June, 2013) and the explosion of a Refinery in Torrance (Feb, 2015) are all widely known major incidents that have resulted in major loss of lives, damage to the assets and the environment. These looses worth millions of dollars not counting the loss of lives shows that process safety barriers was compromised. How then can we be more certain that these incidents does not occur again in our plants? What indicators can we look out for? Are our risk assessment for process safety accidents properly assessed with adequate barriers defined to prevent the occureance of major incidents? This paper focuses on the technological risk assessment (scenario based assessment; a Total E&P major risk assessment methodology) carried out on OML 99 for the management of major risk activities. To study, manage operational activities, hazards to people, environment and assets were identified and assessed in a systematic methodology and associated risks evaluated. The objective of the process was to proffer risk reduction measures and ensure that sufficient barriers exist to prevent major risk scenarios. The outcome of the technological risk process was the major risk register containing the top ten scenarios (Major Risks) showing scenarios, barriers/controls in preventing and protecting the occurrence of these major accidents with an action plan containing a list of approved risk reduction measures at the end of the ALARP demonstration. As examples, the paper communicates the barrier management strategies between the major risk register, the site emergency response plan, safety critical barriers and management inorder for Field Operations management to ensure that the asset operational Chain of Command identifies and manages the major risks of their installations in order to prevent the occurrence of major incidents.