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