What different acceptable strategies may address common-mode failure vulnerabilities in digital safety system designs?
The staff guidance in NUREG/CR-6303, “Method for Performing Diversity and Defense-in-Depth Analyses of Reactor Protection Systems,” provides a set of recommended criteria for each diversity attribute, ranked in order of relative importance within each attribute. The Diversity and Defense-in-Depth (D3) research project will explore combinations of equipment diversity in microprocessor hardware and software and will assess the strengths and weaknesses of the resulting system D3. This research will provide recommendations for staff guidance in terms of best practices for digital system D3 design strategies. In addition, a task working group (TWG), consisting of various NRC staff members and industry participants, has been formed to identify and resolve technical issues that will result in more efficient licensing of digital I&C systems for new reactor applications and for retrofits at operating reactors/facilities.
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