The U.S. Nuclear Regulatory Commission (NRC) staff is presently reviewing human factors designs and development proposals for "advanced" reactors; plants that may be built in the future. One or more of these reactor designs will likely include some form of computerized emergency operating procedures systems (CEOPs) for use by plant operations personnel during transients and accidents.Twelve different CEOPs are known to be under development at the present time. These vary in terms of their philosophy {e.g. rule vs knowledge-based), their user interface, and their approach to function allocation and degree of automation. This study was undertaken to identify the salient characteristics of these systems in terms of their potential effects on control room crew performance and safe plant operation, as a first step in the development of guidelines by which the NRC can review such CEOPs prior to their implementation.
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