原子能委员会把假想的反应事故分为1级（小事故最大发生率）至9级（最严重事故最小发生率）。
The AEC had classified hypothetical reactor accidents from Class 1 (trivial incidents with high occurrence probability) to Class 9 (ultimate severity with occurrence highly unlikely).
原子能委员会把假想的反应事故分为1级（小事故最大发生率）至9级（最严重事故最小发生率）。
The AEC had classified hypothetical reactor accidents from Class 1 (trivial incidents with high occurrence probability) to Class 9 (ultimate severity with occurrence highly unlikely).
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