Building Risk Assessment

Building Risk Assessment (BRA) is a tool used to assess the risks to people in occupied buildings in the facility.

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:

Three Stages of conducting a Building Risk Assessment.

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?
On award of the study FSES will issue a project ToR. This will highlight the assumptions that will be made in the study. It will also include the methodology that will be utilised as well as any further information required from the client.
Upon acceptance of the ToR, FSES will conduct the analysis and prepare a BRA report. The report will describe the facility, the scope of work, include a detailed methodology, the identified buildings, the occupancy of each building, the results of each stage of the assessment and any recommendations and identification of further mitigation measures based on the results.


Why FSES?  


FSES have conducted several BRA’s for clients around the world. FSES thus know the requirements of conducting a successful BRA to the pleasure of the client. FSES can also conduct the preceding consequence analysis, as well as other risk analyses such as QRA’s to quantify the total risk to the facilityFor more information, or to discuss your needs for conducting a BRA, contact us using the form below or email .


Our Services at FSES

Compliance to the international Standards such as IEC 61508 and IEC 61511 are imperative to meeting the Functional Safety requirements for many processes and have formed part of the quality management systems of many companies. Provision of Functional Safety Services in line with the Phases and Activities detailed in the Safety Life-cycle is an area in which our consultants are able to demonstrated experience and expertise.

Learn more about our services

PHA, HAZID and HAZOP Studies

FSES can provide Process Hazard Analysis (PHA) and HAZard and OPerability (HAZOP) study chairpersons. Our expert PHA facilitators hold certification in conducing HAZOP, HAZAN and CHAZOP.

Functional Safety Training

FSES provide various Functional Training services for all of specific parts of IEC 61508 and its sector derivatives

Consequence Modelling

Discharge and Dispersion is often required to evaluate the consequence of identified hazardous events.

Design Engineering

Functional safety activities are most effective by integration into a well-established and proven quality management system.

Building Risk Assessment

Building Risk Assessment (BRA) is a tool used to assess the risks to people in occupied buildings in the facility.

Escape, Evacuation and Rescue Analysis

Escape, Evacuation and Rescue Analysis ensures that the design of a facility is such that the risk to personnel is kept to within the ALARP region.

Functional Safety Assessment

Independent Management of Functional Safety Assessments, Audits & Support.

Functional Safety Lifecycle and Management

Functional Safety Lifecycle and Management is a key requirement demonstrating how Functional Safety is to be implemented and achieved.

Human Factors

Human factor assessment is a key area in identifying potential hazards which may be instigated by human errors.

Legacy Systems

Legacy Systems Review and Compliance.

Prior Use

Prior Use Assessment.

Proof Testing Procedures

Proof Testing is one of the main requirements to ensure that Functional Safety is maintained throughout the operational phase.

Operation and Maintenance

FSES can carry out review studies and provide consultancy to ensure Functional Safety requirements are maintained during Operation and Maintenance.

Quantitative Risk Assessment

Quantitative of Risk in terms of IRPA, PLL and graphical demonstrations such as FN Plots.

Reliability, Availability and Maintainability Study (RAMS)

Reliability, Availability and Maintainability Study (RAMS) is used as a decision making tool to increase the availability of the system, and thus increase the overall profit as well as reducing the life cycle costs.

Safety Requirements Specification

The Safety Requirements Specification (SRS) is a core document, which is used as the main reference to be followed by designers, installers, and operators of a Safety Instrumented Function (SIF).

SIL Determination

FSES are able to us various methods in identifying SIL targets; qualitatively by Risk Graphs, semi-quantitatively by Layers of Protection Analysis (LOPA) or fully quantitatively by Fault Tree Analysis (FTA).

SIL Verification

Calculation of Random Hardware Reliability and Architectural Assessments for Safety Instrumented Functions (SIFs)

SIS Conceptual Design

Safety Instrumented System (SIS) Conceptual Design