ITEM - Quantitative Risk Assessment System (QRAS) Brochure

S o f t w a r eAssess Your Risk with Confi denceUnderstanding risk and having the right strategies in place when an incident occurs is becoming more evident and essential. More and more, organizations are faced with the need to measure and reduce their risks.A successful and effective approach to risk management critically depends on the ability to answer key questions: • How large are our risks?• What are the most likely risk scenarios and how severe would the consequences be?• What elements in our system or organization are the major contributors to risk?• How will our risk be affected by changes to the system or organization?• How confi dent are we about the answers to the above, and how can we increase our confi dence?Do you have to analyze multiple or single factors to address the uncertainties when reducing your risk? Do you consider such factors as: systems, processes, organization, people, communication and unforeseen elements as part of your risk assessments?Do you need to construct scenarios with many elements or factors during your risk assessment? Do you consider elements that could adversely effect your organization’s mission, proposal, production, fi nances, design, acquisition, schedule, requirements, and management?Do these elements or factors pose a threat or potential risk on their own or have an effect on other parts of the organization?Item Quantitative Risk Assessment System (iQRAS) can help identify the risks, fi nd the major contributors, effective ways to reduce the risks, and improve your understanding. The initiating event integration with time lines, event sequences, failure probability characterization, risk ranking, and sensitivity analysis, provides you with a powerful, integrated, risk analysis environment. Other Probabilistic Risk Assessment (PRA) tools cannot match the unique integration of capabilities in iQRAS.What is iQRASiQRAS is a user friendly software tool with a fully integrated environment for constructing and analyzing risk models. A powerful aid for conducting PRA, you can construct and quantify risk scenario models, estimate numerical risk levels, and identify major risk contributors. Summary of Features• User friendly risk modeling tool• Single integrated environment for risk model construction and analysis• Flexible Graphical editing capabilities for Event Sequence Diagrams and Fault Trees• Powerful and accurate algorithms for risk quantifi cation and risk contributor ranking• Extensive connectivity with productivity tools such as Word and Excel • Extensive printing and report generation capabilities• Ability to save the fault tree and ESD diagram as an image• System navigation using system hierarchy and diagram windows • Create new projects by reusing data from other projects• Enabling reuse of fault trees and ESDs by drag and drop of fault trees and ESDs within and across the projects• Displays gate and event information on the hierarchical and diagram view• Ability to manually move gates and events, change colors, add labels and fi gures etc. in the fault tree diagram• Import/export of gates, event and ESD parameters in various formats such as Excel and Access• Multiple page fault trees. Apart from reuse of repeat logic, transfer gates can also be used to paginate fault trees• Copy and paste gates and events between projects• Simultaneously display fault tree and ESD results on the diagrams• Edit project, system, gate and event information and parameters using dialog and grid views• Simultaneously create and open multiple fault tree projects, and compare analysis results• Create fault trees and ESDs by adding gates and events in the system hierarchy window or by adding gates and events in the diagram windows• Converts CAFTA® models automatically• Converts ITEM ToolKit fault trees automaticallyQuantitative Risk Assessment • Scenario-Based Risk Modeling • Event Sequence Diagrams• Fault Trees • Risk Level Quantifi cation• Risk Contributor Ranking • System Level Risk Aggregation• Binary Decision DiagramsiQRASU.S.A. : +1 714 935 2900 sales@itemsoft.com www.itemsoft.comU.K. : +44 1489 885085 sales@itemsoft.com www.itemsoft.comS o f t w a r eAlthough initially developed for NASA, the features of iQRAS allow it to be applied to a wide range of applications, including aerospace, military, transportation, as well as medical procedures. iQRAS was designed to be used by a wide range of engineers and analysts. It is suitable for use by safety engineers who are seeking to enhance their safety analyses.iQRAS is the latest addition to Item Software’s suite of risk and reliability-software tools. The latest version of the software completes the transformation from the original software as developed by the University of Maryland and NASA. The new environment provides an extensive set of editing and reporting capabilities, in line with those found in ITEM ToolKit, our fl agship suite of tools for reliability, availability, maintainability and safety analysis. On the computational side, iQRAS offers state-of-the-art algorithms that are both highly effi cient and, unlike conventional solution methods used in most other tools, are not subject to often signifi cant approximation errors.Modeling and Analysis CapabilitiesWith iQRAS you can develop risk models in the form of event sequence diagrams and fault tree models. Event Sequence Diagrams (ESD) describe the possible risk scenarios following potential perturbations of normal system operations. Pivotal events in the risk scenarios are further detailed using fault tree models or other distributions. This defi nes the occurrence of those pivotal events as logical combinations of one or more basic events. Each scenario eventually leads to an end-state and consequence that designates the severity of the outcome of the particular scenario.The Event Sequence Diagrams are organized using a system hierarchy, consisting of structural or functional decomposition. A mission timeline allows the break down of the overall mission into multiple mission phases. This organizing capability makes for easy navigation between the potentially large numbers of event sequence diagram models, and tailors the risk scenarios to the particular conditions of a mission phase.A wide variety of quantifi cation models are available to specify the likelihood of occurrence of basic events. These include standard demand-based and time-based reliability models, as well as highly customizable models that take advantage of the optional link with Mathematica®.Additionally, iQRAS contains a centralized common cause failure-modeling feature. This enables common cause failure effects to be introduced across multiple fault trees. This feature signifi cantly reduces the burden of introducing and maintaining common cause failure events in a model.Parameters in all models are specifi ed by means of uncertainty distributions, which can be formed by common parametric models such as the lognormal, uniform, gamma, beta distributions, and probability histograms. For each distribution iQRAS contains fl exible input modes that allow the parameters of the distribution to suit the needs of the analysis.Risk results can be obtained at the fault tree, risk scenario, or end state level. They can also be aggregated over multiple event sequence diagrams associated with a specifi c portion of the system hierarchy and/or a portion of the mission timeline. Analysis features include the estimation of total probability of reaching specifi c (undesirable) end states; the ranking of risk scenarios or risk scenario initiators by total risk contribution; cut-set analysis for the identifi cation and ranking of critical combinations of events leading to a particular end state or consequence; and the computation of importance measures indicating the impact of individual basic events on the overall risk. iQRAS employs state-of-the-art Binary Decision Diagram-based analysis techniques, which are not subject to approximation errors found in traditional analysis techniques. Studies have shown these errors may span orders of magnitude. Monte Carlo (Latin Hypercube) Sampling including based uncertainty propagation techniques are used to determine the uncertainty surrounding numerical results. Separate importance measures are provided to identify the events contributing the most to overall uncertainty. U.S.A. : +1 714 935 2900 sales@itemsoft.com www.itemsoft.comU.K. : +44 1489 885085 sales@itemsoft.com www.itemsoft.comiQRASS o f t w a r eiQRAS 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 hierarchyOrganization of Risk Models• Organization of ESD models by user-defi ned system or function hierarchy • Organization of ESD models by mission phases and operational time intervals • Easy navigation between the ESDs and fault treesCommon Cause Failure Modeling• Centralized defi nition 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 treesQuantifi cation Models• Extensive set of time-dependent and demand based component reliability models • Easy-to-use specifi cation of uncertainty distributions for model parameters• Mathmatica® (not included) Incorporation of Other Models• ITEM ToolKit Event Sequence Diagram Quantifi cation• Quantifi cation of ESDs using the fault tree list created in the fault tree editor• View and attach fault trees from the pivotal/initiating event quantifi cation dialogs • The fault tree editor can be opened and used independently to create and quantify the fault trees • User can change ESD events designatorsGate ESD Detail Results• User defi ned 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 gateReporting, Export of Risk Models and Results• Export of models and results to Microsoft Word, Excel and Access • Extensive reporting capabilities using Crystal Reports™ U.S.A. : +1 714 935 2900 sales@itemsoft.com www.itemsoft.comU.K. : +44 1489 885085 sales@itemsoft.com www.itemsoft.comiQRAS© 2007 Item Software (USA) Inc. All rights reserved. All trade names are copyright of their respective owners.ITEM Software (UK)4 The Belfry4400 ParkwayFareham, HampshirePO15 7FJ, U.K.Tel: +44 1489 885085Fax: +44 1489 885065Email: sales@itemsoft.comURL: www.itemsoft.comITEM Software (USA)34 Executive ParkSuite 210 Irvine, California92614 U.S.A.Tel: +1 714 935 2900Fax: +1 714 935 2911Email: sales@itemsoft.comURL: www.itemsoft.comS o f t w a r eiQRAS Feature HighlightsEvent Sequence Diagram Editing• User-defi ned end state types and consequences • Support for scenario transfer points• Maximum fl exibility to modify visual appearance of diagrams• Auto pagination, auto arranging • Copy/past entire, or only segments of, the ESD Versatile Fault Tree ConstructionThe foundation for building a fault tree is the versatile user interface within iQRAS. It is capable of creating fault trees via a hierarchy mechanism, or a traditional fault tree diagram. The fault tree diagramming mechanism is a feature rich, fully customizable, diagramming tool. • Build fault trees in the traditional way by adding gates and events in the diagram• Build fault trees using a hierarchical view, by adding gates and events to hierarchy nodes • Fault tree diagram and hierarchy are automatically kept synchronized • Change sizes and colors of gates and events, fonts, labels and text boxes• Add text, header and footer information directly to diagramsFault Tree Editing• Unavailability and uncertainty calculations• Full set of logic gates and event types• Reuse of fault tree models across multiple event sequence diagrams• Standard visualization as well as condensed tree-views• Maximum fl exibility to modify visual appearance of diagrams• Hierarchical and tree views of fault tree• Auto pagination, auto arrangingFault Tree Linking• Link fault tree logic to other fault trees or gates. Create fault trees in smaller, manageable piecesMultiple Projects: Fault Trees & Event Sequence Diagram • Effortlessly creates, reviews and analyzes multiple fault trees 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/paste gates and events between projects and fault trees Auto-Arrange and Auto-Paginate• Automatically arranges all gates and events in the fault tree following user-defi ned settings• Automatically paginates fault trees according to user defi ned page settings. Transfer gates are added at appropriate places, dividing into multiple pagesMS Word Transfer• Automatically transfer fault tree diagrams into MS Word™documents iQRAS