CAFTA – Fault Tree Analysis

Probabilistic Risk Assessment and Fault Tree Analysis

Nuclear power plants are heavily regulated. One regulatory requirement is to perform probabilistic risk assessments (PRAs) to quantify and understand public risks of plant operation.

The basic components of a PRA are event trees, fault trees, and reliability data. But nuclear plant PRAs are so complex that PRA software tools are a de facto requirement.

In the oil and gas and process industries, there is an increasing trend to use fault tree analysis in combination with other hazard evaluation methodologies (e.g., HAZOPs, LOPAs) to perform more detailed “quantitative” analyses of potential incident or system failure scenarios. Fault tree analysis was developed in the 1960s and has been widely used in the aerospace and nuclear industries.

CAFTA is the industry leading program used for developing reliability models of large complex systems, using fault tree and event tree methodology. CAFTA has evolved during 30 years of active development by the Electric Power Research Institute (EPRI) www.epri.com and partners OSyS

CAFTA includes state of the art data and graphic visualization tools along with new powerful evaluation tools and reporting capabilities. CAFTA meets the needs of the regulatory-mandated PRA. In addition, CAFTA enables a host of PRA applications, including risk monitoring, system importance ranking, and uncertainty analysis.

CAFTA users comprise 75% of the US nuclear power industry, including nuclear power companies in 13 different countries. CAFTA is also used by all the major aircraft manufacturers, NASA, the US Department of Energy, and a host of aerospace companies.

Features Benefits of Products / Service

Fault tree analysis is a method that informs you about the pathways to system failure. It also provides system failure probabilities and numerical rankings of dominant risk contributors. These results have driven a host of risk-informed applications, both in nuclear power and elsewhere.

CAFTA is:
  • A stand-alone client application
  • Easy to use – both students and risk professionals use CAFTA
  • Everything PRA practitioners need in one package, including sample models
  • Compatible with all the major fault tree analysis products – click “File, Open…” and see your fault tree in CAFTA
  • Recommended by risk professionals in nuclear and aerospace industries.

In addition, CAFTA models are at the heart of our Online Risk Monitoring product

 

Industries

Civil Aerospace Defence

Fault tree analysis is used extensively for new aircraft design. Our CAFTA product is used by all the major aircraft manufacturers, NASA, the US Department of Energy, and a host of aerospace companies.

Power Generation

OSyS CAFTA is used to develop and maintain PRA models by 75% of the US nuclear power industry, including nuclear power companies in 13 different countries.

Oil & Gas Process Industries

Fault tree analysis is increasingly used in combination with other hazard evaluation methodologies (e.g., HAZOPs, LOPAs) to perform more detailed “quantitative” analyses of potential incident or system failure scenarios.

Fault tree analysis is also commonly used to support incident investigations and quantify the probabilities of an incident or primary system failure occurring.

Capabilities

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