報告書番号

284055

タイトル（和文）

原子力発電所におけるヒューマンファクタ評価法－瞬目現象を利用した覚醒水準の評価法－

タイトル（英文）

HUMAN FACTORS ESTIMATION METHODS IN NUCLEAR POWER PLANTS -AN EVALUATION CRITERIA OF THE AROUSAL LEVEL USING THE BLINKING PHENOMENA-

概要 （図表や脚注は「報告書全文」に掲載しております）

原子力発電所中央制御室における監視作業員の役割は提示される情報を正確に認識し，常に適切な判断を行うことであり，大脳の活動レベルを表す覚醒水準を高いレベルに保つことは，誤操作・誤判断を防止するうえからも重要である。本報告では，従来の測定・解析が難しい脳波分析に代る方法として，瞬目現象を利用して，覚醒水準を評価する新しい方法について実験的に検討した。その結果，発生間隔の長い瞬目の増加は覚醒水準の低下を示すこと，また群発性瞬目の著しい増加は，覚醒水準の低下の前兆であり，最も良好な覚醒水準は，その両者とも発生しない状態かあるいは少ない場合であると推定できることを示した。

概要 （英文）

SURVEILLANCE AND OPERATIONAL WORKS ARE THE MOST IMPORTANT LABORS AT THE CENTRAL CONTROL ROOM IN THE NUCLEAR POWER PLANT. TO DECREASE MISS JUDGEMENTS AND OPERATIONS, IT IS NECESSARY TO MAINTAIN THE PERFORMANCE OF OPERATORS AT BETTER CONDITIONS. THE PERFORMANCE IS GREATLY AFFECTED BY THE AROUSAL LEVEL OF THE OPERATORS THAT INDICATES HIS BRAIN ACTIVITIES. THE PROPER AROUSAL LEVEL CONTRIBUTES TO THE IMPROVEMENT OF THE HUMAN RELIABILITY. THIS AROUSAL LEVEL HAS BEEN DETERMINED BY THE EEG FREQUENCY ANALYSIS TECHNIQUES, BUT THE EEG ANALYSIS ISDIFFICULT IN USUAL CIRCUMSTANCE. THUS, THIS PAPER PRESENTS THE EXPERIMENTAL CRITERIA OF THE AROUSAL LEVEL USING BLINKING PHENOMENA THAT IS EASY TO OBSERVE FROM OUT-SIDE VIEWS OF THE FACE. THE FOLLOWING RESULTS ARE OBTAINED: (1) THE TIME SEQUENCE OF THE BLINKING, IS RELATED TO A NERVE CENTER, CHANGES WITH THE PASSAGE OF THE WORKING TIME. IN THIS MODEL EXPERIMENT, THE AVERAGE BLINKING FREQUENCY IS ABOUT 15 PER MIN. (2) THE TIME SHARING OF THE LONG INTERVAL BLINKING (MORE THAN 15SEC) IS RELATEDTO THE EEG LOW FREQUENCY COMPONENT (LESS THAN 12HZ) WITH COEFFICIENT 0.64. THUS, THE INCREASE OF THE LONG INTERVAL BLINKING INDICATES THE LOWER AROUSAL LEVEL (PHASE 1 AND 2).THIS FACT IS ALSO IMPLIED BY THE OPERATIONAL ERROR RATE AND HIS EXPRESSION. (3) THE REMARKABLE INCREASE OF THE SHORT INTERVAL BLINKING (LESS THAN 1 SEC) INDICATES THE PRE-SIGN OF THE DECLINE OF THE AROUSAL LEVEL. (4) IT IS DEDUCED BY THE EEG ANALYSIS AND ERROR RATE THAT THE MOST FAVORITE AROUSAL LEVEL (PHASE 3) IS THE ONE UPON WHICH THE LONG INTERVAL BLINKING DOES NOT OCCUR, AND THE SHORT INTERVAL BLINKING DOES NOT MUCH INCREASE.

報告者

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