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Development of general methodology of safety analysis and evaluation for fusion energy systems (GEM-SAFE)

Yoichi Fujii-E, Yoshiyuki Kozawa, Masana Nishikawa, Takayoshi Yano, Tetsuo Sawada1990年Fusion Engineering and DesignIF 1.7出版社

AbstractA synthesized methodology of safety analysis and evaluation for fusion systems has been developed to concretely assess the adaptability of fusion systems to the environment from the earliest stages of system development. The methodology objective was to summarize both the safety design requirements and achieve rational safety in fusion systems. The framework of the methodology was constructed to clarify its logical consistency. The safety characteristics of fusion systems were then investigated in detail paying attention primarily to potential hazards, so that a fusion system was identified as a distributed system in regard to energy sources and radioactive materials. Based on this recognition, a General Descriptive Model (GDM) of a fusion system has been constructed which is a highly generalized and integrated expression. The safety ensuring principle, on the other hand, set up items to be protected and categorized events for a fusion system. The development of the safety ensuring principle was a key to the practical performance of safety analysis and its evaluation in a general fusion system. Finally, by using the Function-Based Safety Analysis (FBSA) on the GDM, abnormal events were summarized into 16 typical events, according to the safety ensuring principle. Consequently, 20 design based events for the general fusion system were selected to envelope all credible abnormal events.

日本語訳

核融合システムの安全性解析と評価のための統合手法が、システム開発の初期段階から核融合システムの環境適合性を具体的に評価するために開発された。本手法の目的は、安全設計要件を要約し、核融合システムにおける合理的な安全性を達成することであった。本手法の枠組みは、その論理的一貫性を明確にするために構築された。核融合システムの安全特性は、潜在的な危険に主に注意を払いながら詳細に調査され、その結果、核融合システムはエネルギー源と放射性物質に関して分散型システムとして特定された。この認識に基づき、核融合システムの一般記述モデル(GDM)が構築され、これは高度に一般化され統合された表現である。一方、安全確保原理は、核融合システムの保護対象を設定し、事象を分類した。安全確保原理の開発は、一般的な核融合システムにおける安全性解析とその評価の実践的遂行の鍵であった。最後に、GDM上で機能ベース安全性解析(FBSA)を用いることにより、異常事象は安全確保原理に従って16の代表的事象に要約された。その結果、一般的な核融合システムのための20の設計基準事象が、すべての想定可能な異常事象を包含するように選定された。

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