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Development of system based code, 1; Reliability target derivation of structures and components

システム化規格の開発,1; 構造物及び機器の目標信頼度の導出

栗坂 健一 ; 中井 良大 ; 浅山 泰 ; 高屋 茂 

Kurisaka, Kenichi; Nakai, Ryodai; Asayama, Tai; Takaya, Shigeru

本論文は、システム化規格の開発の一環として、構造信頼性の目標値を安全性の視点から設定するための新手法について記述するものである。本手法では、確率論的安全評価(PSA)解析モデルを活用して、原子力安全委員会が公表した定量的安全目標案及び日本原子力研究開発機構が高速炉サイクルの実用化研究開発プロジェクトの中で策定した定量的な安全設計要求から信頼性目標を導出する。本手法をJSFRの原子炉冷却系を構成する構造物及び機器の信頼性目標の決定へ適用した。その結果、内的事象PSA解析モデルと組合せた本手法は構造物及び機器の偶発的な破損に関連する信頼性目標の決定に適用可能であること、並びに地震を起因とする事象に関する手法は地震により重要な構造物及び機器のいずれかが破損する頻度の目標値を導出可能であることを確認した。

The present paper describes a new method for determining the target value of structural reliability in the framework of the System Based Code by considering the safety point of view. In the new method, the reliability target is derived from the proposal to a quantitative safety goal that was published by the nuclear safety commission of Japan and the quantitative safety design requirements on the core damage frequency and the containment failure frequency that were determined in the Fast Reactor Cycle Technology Development Project by Japan Atomic Energy Agency, by utilizing analysis models of a probabilistic safety assessment (PSA). The present method was applied to determination of the reliability target of the structures and components which constitute the reactor cooling system in the Japanese sodium-cooled fast reactor. As a result, we confirmed that the present method combined with the PSA analysis model for internal initiating events is applicable to determination of the reliability target associated with a random failure of the structures and components, and that the method related to seismic initiating events can derive the target value of the occurrence frequency at which any of the important structures and components fails due to an earthquake.

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