ITEM QRAS

Quantitative Risk Assessment Software

iQRAS Major Features

Risk Model Analysis

• Exact results generated by Binary Decision Diagram (BDD) based solution methods
• Computation of cut-sets, risk importance measures, probabilities for fault trees and ESDs
• Uncertainty propagation and uncertainty importance measures
• Risk aggregation over event sequence diagrams, end state types, and system or functional hierarchy

Organization of Risk Models

• Organization of ESD models by user-defined system or function hierarchy
• Organization of ESD models by mission phases and operational time intervals
• Easy navigation between the ESDs and fault trees

Common Cause Failure Modelling

• Centralized definition of common cause failure event groups
• Automated application of common cause failure expansions to selected fault tree models
• Support for Alpha and Beta Factor models
• Common cause failure expansions within and across fault trees

Quantification Models

• Extensive set of time-dependent and demand based component reliability models
• Easy-to-use specification of uncertainty distributions for model parameters
• Mathmatica® (not included)

Event Sequence Diagram Quantification

• Quantification of ESDs using the fault tree list created in the fault tree editor
• View and attach fault trees from the pivotal/initiating event quantification dialogs
• The fault tree editor can be opened and used independently to create and quantify the fault trees
• User can change ESD events designators

Gate ESD Detail Results

• User defined number of cut sets that iQRAS will calculate based on probability. iQRAS can also display the actual number of cut sets for the analyzed system. For example; the advanced BDD algorithm could calculate the top 500 cut sets, even if the actual cuts were more than a billion, within seconds
• Users can get detailed uncertainty results for any gate

Download Demonstration

To download a free demonstration of our Quantitative Risk Assessment software click here.

Download Demo | Web Demo | Spec Sheet | Training

Screen shots | click to enlarge

ESD View

MIssion Phase View

OTI Selection View

Chart View

Features

Single integrated environment for risk model construction and analysis

Multiple Projects, Fault Trees & Event Sequence Diagrams:

Effortlessly creates, reviews and analyses multiple fault tree and ESDs simultaneously

Merge all or a portion of a fault tree to create a master fault tree

Manage fault trees from multiple projects

Allow creation of a fault tree by reusing all, or a portion, of an existing project

Copy and paste gates and events between projects and fault trees

Reporting, Export of Risk Models and Results:

Export of models and results to Microsoft Word, Excel and Access

Extensive reporting capabilities using Crystal Reports™

Converts CAFTA models automatically

Fault Tree Linking:

Link fault tree logic to other fault trees or gates. Create fault trees in smaller, more manageable pieces

Powerful and accurate algorithms for risk quantification and contribution ranking