Building Risk Assessment
Building Risk Assessment (BRA) is a tool used to assess the risks to people in occupied buildings in the facility. This is also sometimes identified as an Occupied Building Risk Assessment (OBRA).
Stages of a BRA
FSES apply the three stages of the BRA as required. The three stages are as follows:
Stage 1: Building Screening
In this stage FSES will screen the building based on the occupancy and function of the buildings in the scope of work. Buildings found to be of low occupancy and low risk function will be eliminated from the assessment at this stage.
Stage 2: Building Hazard Assessment
The consequences identified from the Fire, Explosion and Toxic Gas Dispersion and Explosion analysis is used to determine the effects of the hazardous releases on the buildings in Stage 2. Mitigation and Risk reduction measures are typically identified in this stage if required.
Stage 3: Risk Management Assessment
In instances where further risk reduction measures are not appropriate, a risk management assessment will be conducted to evaluate the risks associated with the building.
Method of Conducting BRA
FSES apply a software based approach using DNV PHAST. The consequence models are analysed and the risk is calculated to the various occupied buildings taking account of the average building occupancy.
What inputs are required by FSES to conduct the BRA?
As a minimum the following information would be required to conduct the study:
– Existing PHA / HAZOP report
– Consequence Analysis Models
– List and Drawings of occupied buildings
– Building Occupancy figures
Based on the project requirements, additional information may be required. This will be highlighted within the Terms of Reference (ToR).
- What is the expected output of the BRA?