報告書番号

T06

タイトル（和文）

ＦＢＲ高温構造設計の合理化－非弾性解析法の実用化と異材継手に関する検討－

タイトル（英文）

RATIONALIZATION OF HIGH-TEMPERATUR STRUCTURAL DESIGN FOR FBR -DEVELOPMENT OF INELASTIC ANALYSIS METHOD AND DISSIMILAR WELDED JOINTS STUDY

概要 （図表や脚注は「報告書全文」に掲載しております）

１．高速炉設計への非弾性解析法の実用化（１）構成式としては，大野モデルの有効性が高いが，さらに複雑な条件に対しては新しいモデルの提案を示した。（２）破損寿命評価側としては，Ｍａｊｕｍｄａｒ法の単軸条件での優位性が示されるとともに多軸疲労のクライテリオンの提案を示した。（３）非弾性解析に基づく寿命推定値は構成式によってかなり影響を受けるが，いずれの方法を用いても炉壁熱保護条件の緩和が可能である見通しが得られた。２．異材継手に関する検討（１）検討対象として１１種類の異材継手を選択し，施工法確認試験を実施して現行法令が満足されることを確認した。（２）１／８主容器モデルに対して現地溶接を想定した周方向横向姿勢

概要 （英文）

1.PRACTICAL USE OF INELASTIC ANALYSIS METHODIN FBR DESIGN IN STRUCTURAL DESIGN OF VARIOUS COMPONENTS OF FAST BREEDER REACTORS,INELASTIC DEFORMATION BEHAVIOR AND ITS ASSOCIATED FAILURE SHOULD BE PROPERLY EXPLAINED. COMPARED WITH THE ELASTIC DESIGN METHOD,ITIS EXPECTED THAT THE EMPLOYMENT OF AN INELASTIC DESIGN METHOD CAN REDUCE THE EXCESSIVE MARGIN AND REALIZE THE SIGNIFICANT IMPROVEMENT ON PLANT EFFICIENCY. VARIOUS WORKS WERE CONDUCTED IN THIS STUDY TO MODIFY THE INELASTIC ANALYSIS METHOD AIMING AT THE APPLICATION TO MAIN VESSEL DESIGN AS THE FINAL GOAL. MAIN RESULTS OBTAINED IN THIS STUDY ARE SUMMARIZED AS FOLLOWS. (1)IT WAS FOUND THAT OHNO S CONSTITUTIVE MODEL IS THE MOST EFFECTIVE AMONG THE EXISTING MODELS IN SIMPLE CYCLIC CONDITIONS. NEW MODEL WAS ALSO PROPOSED FOR THE IMPROVENT OF PREDICTION ACCURACY IN MORE REALISTIC CONDITIONS. (2)IT WAS SHOWN THAT MAJUMDAR S DAMAGE RATE APPROACH CAN MAKE BETTER PREDICTION OF FAILURE LIFE UNDER UNIAXIAL FATIGUE-CREEP CONDITIONS. NEW DEFINITION OF EQUIVALENT STRAIN RANGE WAS FOR MULTIAXIAL FATIGUE CONDITIONS. (3)FALUIRE LIFE PREDICTED BY INELASTIC ANALYSIS WAS SOMEWHEN INFLUENCED BY THE CONSTITUTIVE MODELS,BUT THE PROSPECT FOR LARGE RELAXATION OF REQUIREMENT FOR THERMAL INSULATION STRUCTURES WAS OBTAINED REGARDLESS OF MODELS USED. 2.DISSIMILAR WELDED JOINTS STUDY IT IS EXPECTED THAT COAT REDUCTION WILL BE REALIZED BY THE EMPLOYMENT OF THE DISSIMILAR WELDED JOINT BETWEEN THE MAIN VESSEL AND THE ROOF SLAB OF THE POOL-TYPE LMFBR. IT IS IMPORTANT FOR THE REALIZATION OF THIS DESIGN TO ENSURE THE INTEGRITY OF THE DISSIMILAR WELDED JOINT BETWEENSTAINLESS STEEL AND CARBON STEEL. THIS REPORT IS THE FINAL ONE OF DISSIMILAR WELDED JOINTS STUDY CARRIED OUT THE COOPERATIVE STUDY BETWEEN CRIEPI,HITACHI,TOSHIBA,AND MITSUBISHI FOR THREE YEARS BEGINNING 1984. THEMAIN RESULTS OBTAINED IN THIS STUDY ARE AS FOLLOWS:

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