Sammendrag
Human Reliability Analysis (HRA) is an important part of probabilistic risk/safety assessment (PRA/PSA) for nuclear power plants (NPPs). Data has played a central part in HRA, to underpin nominal task probabilities, providing time reliability estimates, and as a basis for multipliers for performance shaping factors (PSFs). Recently, the analysis focus in the nuclear industry has expanded into areas such as PRA for flooding and fire. This expands the challenges for the operators as to decision making in unforeseen situations. In the not so far future, one may also envision that cyber security threats will expand even further the plausible analysis space for accidents and incidents. New NPPs contain digital I&C systems. Will this require new or updated HRA methods and more data as compared to today? This paper will focus on the way in which new technology may impact human performance. We have seen that the combination of the new technology and how it is used by the crew is decisive for the performance of the joint system, the crew and technology. Thus, it is important to study both aspects. For HRA, two questions are important: What is the impact of teamwork and crew roles on recovery? And how should dependency be treated in modern control rooms? This paper discusses these matters based on experiences in the OECD Halden Reactor Project.
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