Contemporary human reliability assessment techniques applied in the nuclear industry need to address more that simple errors of omission, errors of selection, and errors in task execution. The inadvertent selection of the wrong control from a bank of controls, skipping a step in a procedure by mistake, or the misreading of a display or indicator are representative of these classes of error. The distinction between simple errors and errors involving higher level cognitive processes has been acknowledged previously. As a next step, it is desirable to determine (1) the situations which promote the occurrence of low frequency high consequence decision based errors, (2) a classification scheme or framework for these errors, and (3) the expected failure rates for these errors once entry level conditions for their occurrence have been met. This presentation addresses 1 and 3 above, and presents a method for estimating errors associated with misunderstanding procedures, confusion regarding system response and inadequate problem solving. A function defining the relationship between composite performance shaping factors and human error probabilities is presented as well.
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