A survey of control room operators in a nuclear power plant identified practicalactivities for maintaining alertness during the early morning hours. Nine on-dutyoperators rated 16 activities they were allowed to do on shift. Activities most effectivefor alertness were splashing cool water on the face, drinking coffee, and doing thingsthat used muscles. The least effective activities were passive monitoring and studyingfor exams. The large range of ratings indicates that activity has a major role in operatoralertness during the early morning hours.
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