On system validity, quasi-experiments, and safety: a critique of NUREG/CR-6393

Based on the methods of Cook and Campbell (1979), a quasi-experimental validation model for complex human–machine systems has been recommended for the final evaluation of nuclear power plant control rooms (O'Hara et al., 1997). This model-based approach to validating systems and assuring safety is critiqued in terms of experimental theory and engineering practice. It is concluded that the model may be inappropriate for industry as a general model of engineering validation.

Keywords: NUREG/CR-6393, NUREG-0711, quasi-experiments, validation models, system validity, safety assurance, validation modelling, human–machine systems, nuclear power plants, plant control, nuclear safety, nuclear power, nuclear energy, engineering validation