Development of reliability and probabilistic safety assessment program RiskA

PSA (probabilistic safety assessment) software, the indispensable tool in nuclear safety assessment, has been widely used. An integrated reliability and PSA program named RiskA has been developed by FDS Team. RiskA supplies several standard PSA modules including fault tree analysis, event tree analysis, uncertainty analysis, failure mode and effect analysis and reliability database, etc. RiskA has several advanced features such as extensible framework, fast fault tree analysis, multiple models formats support and web-based co-modeling. Not only the overview of the architecture and basic functions of RiskA, but also the challenges and solutions in the development procedure of RiskA were introduced. The comparison between RiskA and other popular PSA codes has demonstrated that the calculation and analysis of RiskA is more accurate and efficient. Based on the development of this code package, many applications of safety and reliability analysis of some research reactors and nuclear power plants were performed.