Risk Matrix
Risk matrix reporting within Safety Lifecycle Manager (SLM) provides a visual representation of mitigated risk across an enterprise, site, or unit. Using the LOPA Dynamic Risk Matrix (DRM), organisations can quickly identify which scenarios fall within acceptable risk tolerance and which hazards require additional risk reduction measures.
The Dynamic Risk Matrix combines information from LOPA worksheets, severity classifications, likelihood calculations, and Independent Protection Layers (IPLs) to provide a real-time view of current risk exposure. This enables teams to understand the effectiveness of safeguards and prioritise additional mitigation where necessary.
This guide explains how the risk matrix works in SLM, how hazards are positioned within the matrix, how IPLs affect risk reduction, and how the DRM integrates with HAZOP, LOPA, and operational safety management activities.
What Is a Risk Matrix?
A risk matrix is a visual tool used to evaluate hazards based on their severity and likelihood. It helps organisations understand which risks are acceptable and which require additional safeguards or mitigation measures.
Within SLM, the LOPA Dynamic Risk Matrix displays the mitigated risk associated with hazards after Independent Protection Layers (IPLs) have been applied.
The matrix allows users to quickly:
- Identify high-risk scenarios
- Review residual risk after mitigation
- Prioritise corrective actions
- Monitor the effectiveness of protection layers
- Navigate directly to underlying LOPA worksheets
Understanding where hazards sit within the matrix is a fundamental part of risk-based decision making and functional safety management.
For an overview of how risk reduction targets relate to Safety Integrity Levels, see Safety Integrity Levels (SIL) Explained.
Severity and Likelihood Explained
The risk matrix uses two dimensions to classify hazards.
- Severity is displayed vertically.
- Likelihood or Frequency is displayed horizontally.
Every hazard is positioned within the matrix according to these two values.
The resulting location indicates the overall level of risk and whether additional mitigation may be required.
Within SLM, users can click any matrix cell to view:
- Hazard descriptions
- LOPA worksheet references
- Equipment information
- Severity classifications
- Likelihood values
- Barrier information
This allows users to move seamlessly from high-level risk reporting into detailed risk analysis.
Dynamic Risk Matrix and LOPA Analysis
The Dynamic Risk Matrix (DRM) is populated directly from LOPA studies performed within SLM.
Each LOPA scenario is analysed to determine whether sufficient risk reduction exists to meet the organisation’s tolerable risk criteria.
The DRM displays these results at:
- Enterprise level
- Site level
- Unit level
Unlike a traditional HAZOP matrix that displays unmitigated scenarios, the DRM displays the residual risk after safeguards and IPLs have been considered.
To understand how LOPA calculations determine residual risk, see our LOPA Calculations resources.
How IPLs Affect the Risk Matrix
Independent Protection Layers have a direct impact on the risk matrix because they influence the mitigated likelihood of a hazard.
As IPL effectiveness increases, hazards move toward lower-risk regions of the matrix.
The Probability of Failure on Demand (PFD) associated with each IPL determines the amount of risk reduction achieved.
- Lower PFD values provide greater risk reduction.
- Higher-performing IPLs move hazards toward lower-frequency cells.
- Bypassed or unavailable IPLs increase residual risk.
This visual movement within the DRM helps users quickly understand the effectiveness of protection layers.
Learn more about how PFD values are generated in our SIL Calculations guide.
Risk Matrix Analysis and LOPA of Record
Only worksheets designated as a LOPA of Record are included within the Dynamic Risk Matrix.
This ensures risk reporting is based on approved analyses rather than draft or incomplete studies.
Users can mark worksheets as a LOPA of Record:
- Directly within the worksheet
- Through the LOPA Sheet List view for bulk updates
This provides organisations with control over which studies contribute to formal risk reporting and management reviews.
Risk Matrix Connections to HAZOP and SIL Determination
The risk matrix is closely connected to both HAZOP and SIL determination activities.
HAZOP studies identify hazards and initiating causes, while LOPA evaluates whether sufficient risk reduction exists to achieve tolerable risk.
Where additional risk reduction is required, SIL determination activities may be performed to establish the required Safety Integrity Level.
Related resources:
Bypass Management and Risk Reporting
The Dynamic Risk Matrix is integrated with the Operate and Maintain module, allowing users to understand how bypassed safeguards affect risk.
When an IPL is placed into bypass, SLM can calculate and display the resulting increase in likelihood and risk exposure.
Users can compare:
- Pre-bypass risk
- Bypass risk
- Current matrix position
- Expected matrix position without the safeguard
This capability supports informed operational decisions and improves visibility into temporary risk increases.
Best Practices for Dynamic Risk Reporting
To maximise the value of the Dynamic Risk Matrix:
- Maintain accurate LOPA worksheets
- Regularly review IPL performance
- Monitor bypassed safeguards
- Ensure LOPA of Record status is maintained
- Review matrix reports during risk review meetings
- Investigate hazards located within unacceptable risk regions
These practices help organisations maintain visibility of operational risk and support continuous improvement activities.
Learn More About Risk Assessment Reporting
The Dynamic Risk Matrix provides a powerful visual representation of residual risk across an organisation. By combining severity, likelihood, IPL performance, and operational status, SLM helps users identify where additional mitigation may be required.
Additional resources:
For additional information on risk management methodologies and process safety standards, visit the International Electrotechnical Commission (IEC).
