Fault Tree Analysis (FTA) – Software
Fault Tree Analysis
The Mantua Group delivers Fault Tree Analysis (FTA) using RWB — constructing and quantifying deductive failure logic models that identify the combinations of basic events and component failures that can cause an undesired top-level event, supporting safety case submissions and risk assessments.
- Qualitative and quantitative FTA
- Minimal cut set identification
- Probability and frequency calculation
- Importance measure analysis
- Common cause failure modelling
- Linked event trees and FTAs
- Monte Carlo simulation solution
- IEC 61508 and ARP4761 compliant
Integrated since 2009
Implementation
Software Deployed
Professionals on Staff
Why Choose RWB Fault Tree Analysis
Fault trees provide a rigorous, auditable model of how failure combinations lead to hazardous outcomes. RWB's FTA module supports the complete analysis workflow — from tree construction through minimal cut set identification, quantification and importance analysis — in a format accepted by regulators and certification bodies worldwide.
Qualitative and Quantitative Analysis
Qualitative FTA identifies every minimal cut set — the smallest combination of basic event failures that causes the top event. Quantitative analysis calculates the top event probability, frequency and unavailability from component failure rate and repair time data, with and without common cause failure contributions.
Minimal Cut Set Identification
Minimal cut sets expose the logical structure of system vulnerability — revealing single-point failures (cut sets of order 1), double failures and higher-order combinations. RWB computes all minimal cut sets efficiently and ranks them by their contribution to top event probability.
Importance Measures
Birnbaum, Criticality, Risk Achievement Worth and Risk Reduction Worth importance measures identify which basic events most influence top event probability. Direct safety improvement effort, component qualification and inspection resources to where they reduce risk most effectively.
Common Cause Failure Analysis
Model common cause failures using Beta Factor, Multiple Greek Letter or Alpha Factor methods. Common cause failures can dominate risk in redundant systems by simultaneously defeating multiple barriers — their correct modelling is mandatory in IEC 61508, nuclear and defence safety cases.
Linked Event Trees and FTAs
Link fault trees to event trees to model the progression from initiating event through safety function success or failure to final consequence. Linked models capture the complete accident sequence logic and enable quantification of risk at the system boundary — the basis for LOPA and Safety Integrity Level determination.
Safety Case and Regulatory Support
TMG delivers FTA in formats directly compatible with IEC 61508 functional safety cases, ARP4761 system safety assessments, and nuclear/defence regulatory submissions. We lead FTA facilitation workshops, perform independent review of existing fault trees, and prepare evidence packages for certification authority submission.
How The Mantua Group Works With You
Every organisation is at a different point in its reliability journey. We match our engagement to where you are — from full hands-on delivery through to training your team to self-sufficiency.
We Do — You Learn
TMG leads the full implementation with your team participating throughout to build genuine capability alongside delivery. Ideal for first-time deployments or when internal resources are stretched.
We Do Together
Our most common model. TMG engineers work alongside your maintenance, operations and engineering teams in structured workshops — combining their asset knowledge with our analytical methodology to produce models your team trusts and owns.
We Train — You Do
For teams building internal capability, TMG delivers structured training covering software operation, methodology, and integration. Available as public courses or dedicated onsite delivery across Australia and the United States.
Independent Review & Audit
TMG provides independent technical review of existing models and regulatory submissions — assessing methodology rigour, data quality and standards compliance. Particularly valuable ahead of AER determinations, investment board presentations or safety audits.
Quantify Your System Risk
Whether you need a fault tree for a functional safety submission, an independent FTA review, or your team trained in fault tree methodology — The Mantua Group is ready to help.
Contact Us Today+61 (0) 439 118 714
+1 (330) 294-3744