Evaluation of the Sequential Safety Analysis Method Based on the Related Severity of Hazards Using STAMP/STPA

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  • STAMP/STPA によるハザード影響度に基づく 逐次的な安全解析方法の構築評価
  • STAMP/STPA ニ ヨル ハザード エイキョウド ニ モトズク チクジテキ ナ アンゼン カイセキ ホウホウ ノ コウチク ヒョウカ

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Abstract

<p>It is important to immediately give feedback about the component safety constraints introduced by safety analysis using STAMP/STPA in the requirement development phase. In this research, regarding the application of STAMP/STPA, we propose a method to prioritize the introduced unsafe control actions （UCAs） for safety analysis. UCAs trigger system hazards, and these hazards cause losses. By using traceability among UCAs, hazards and losses, we prioritize the UCAs according to effects of the hazards related to UCAs. STAMP/STPA analysis is executed according to the prioritized UCAs. The results of the safety analysis, component safety constraints, are fed back to the requirement development phase sequentially. Therefore, it is aimed to develop a system that is highly safe in the early development phase. Furthermore, we propose to show the solutions to solve problems using STAMP/STPA in actual development projects by applying our proposals to the radiation treatment system.</p>

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