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Digital instrumentation and control (DIC) systems at nuclear power plants(NPPs) have many advantages over analog systems. They are proven to be morereliable, cheaper, and easier to maintain given obsolescence of analogcomponents. However, they also pose new engineering and technical challenges,such as possibility of common cause failures (CCFs) unique to digital systems.This paper proposes a Platform for Risk Assessment of DIC (PRADIC) that isdeveloped by Idaho National Laboratory (INL). A methodology for evaluation ofsoftware CCFs in high safety-significant safety-related DIC systems of NPPs wasdeveloped as part of the framework. The framework integrates three stages of atypical risk assessment, qualitative hazard analysis and quantitativereliability and consequence analyses. The quantified risks compared withrespective acceptance criteria provide valuable insights for systemarchitecture alternatives allowing design optimization in terms of riskreduction and cost savings. A comprehensive case study performed to demonstratethe framework capabilities is documented in this paper. Results show that thePRADIC is a powerful tool capable to identify potential digital-based CCFs,estimate their probabilities, and evaluate their impacts on system and plantsafety.

Quantitative Evaluation of Common Cause Failures in High  Safety-significant Safety-related Digital Instrumentation and Control Systems  in Nuclear Power Plants