Prairie Island Nuclear Power Station Incident, time 1414
(adapted from Operator Decision/ Action Summary
in Pew et al, p. B-12)

Event, or operator comment	Underlying cognitive processes (inferred by analysis)
high radiation alarm on IR15 air ejector	INFORMATION AVAILABLE
	COGNITIVE INFERENCES BY OPERATORS :
occasional spiking produces false alarms, assume this is a false alarm	Interpretation
if not a false alarm, IR15 will alarm again	Expectation
monitor for further indications	Intention