STRESS STATES IN NUCLEAR OPERATORS UNDER CONDITIONS OF SHIFTWORK

This study examined the stress states experienced by nuclear power ope rators at work under an existing shift system, time-on-shift effects a nd the manner in which these states may be moderated by achievement mo tivation and a sense of coherence. The results show an incidence of st ress states during evening shifts and night-shifts in the operators, w hich are primarily characterized by increased distraction as well as b y enhanced sleepiness and low irritability. The night-shift was found to be the most problematic one in terms of increased sleepiness and di stractibility, and reduced alertness. An abrupt fall in alertness duri ng the evening shift and a considerably increased distractibility at i ts end were observed. These facts, as well as the lack of recuperation from daily domestic activities and caring for children at the start o f the shift, suggest that besides the night duty, the evening one also constitutes a serious challenge to operational safety at this nuclear facility. Correlations found between personality characteristics and sleepiness, distractibility and irritability, indicate personal resour ces as important modifiers of stress states. A narrowing in the effect s of motivation and sense of coherence was found in the evening shifts and night-shifts. The results have practical implications for intenti onal modifications of personal resources at nuclear facilities.