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概要

The present paper discusses a concept of safety design and accident models in complex systems. Modern artifacts or engineering products in our daily life are usually controlled by embedded computers and inevitably connected to Internet. Due to big progress of computer hardware and software performance, control algorithms become more and more sophisticated, intelligent and complex. This makes difficult to assure the safety of the system. Since the current safety assessment tools such as FTA/ETA, FMEA or HAZOP were developed more than 50 years ago, it is difficult to use them in modern complex system safety assessment. In the present paper, one of new hazard analysis techniques, called STAMP/STPA, will be discussed to meet a new safety requirement of ‘Safety2.0’.

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