Consequence Modelling under COMAH / SEVESO III Directive

Major Accident to the Environment (MATTE) refers to a large-scale incident involving dangerous substances that results in significant and long-term environmental damage, particularly to water, soil, or ecosystems. 

Under Ireland’s COMAH (Control of Major Accident Hazards) Regulations—implementing the EU Seveso III framework—operators of fuel storage facilities are required to identify such scenarios, assess their consequences, and demonstrate effective measures to prevent and mitigate impacts.

DIV Consulting supports operators in meeting these obligations by delivering quantitative, hydraulic-based modelling of major accident scenarios. This includes detailed simulation of storage tank failures and the effectiveness of mitigation systems such as bunds, lagoons, and drainage networks.

The modelling encompasses instantaneous tank collapse, as well as simultaneous failure of multiple tanks due to fire escalation, along with jetting releases at shell manways and various combinations of these events. Assessments are performed under different conditions, including with and without rainfall, and with the application of fire water and firefighting foam.