T he nuclear industry is currently designing and buildin g a new generation of reactors that will include different structural, funct ional, and environmental aspects, all of which are likely to have a significant impact on the way these plants are operated. In order to meet economic and safety objectives, these new reactors will all utilize advanced technologies to some extent , including new materials and advanced digital instrumentation and control systems. New technologies will affect not only operational strategies, but will also require a new approach to how functions are allocated to humans or machines to ensure optimal performance. Uncertainty about the effect of large-scale changes in plant design will remain until sound technical bases are developed for new operational concepts and strategies. Up-to-date models and guidance are needed for the development of operational concepts for complex socio-technical systems. T his report describes how the classical Work Domain Analysis method has been adapted to develop operational concept frameworks for new plants. T his adaptation of the method is better able to deal with the uncertainty and incomplete information typical of first-of-a-kind designs. Practical examples are provided of the systematic application of the method in the operational analysis of sodium-cooled reactors. Insights from this application and its utility are reviewed and arguments for the formal adoption of Work Domain Analysis as a value-added part of the Systems Engineering process are presented. NOT E: It is assumed that readers are familiar with previous milestone reports; hence, some important background information that would have added substantially to the bulk of this report has been omitted. References to previous reports are included where relevant. StrAn Strategies Analysis
