原子炉配管の確率論的構造健全性評価-1 溶接条件と溶接残留応力のばらつき
Probabilistic Structural Integrity Assessment of Reactor Coolant Pressure Boundary Piping-1- The Scatter of Welding Conditions and Welding Residual Stress -
著者:
飛田 徹 Tohru TOBITA 勝山 仁哉 Jinya KATSUYAMA 伊藤 裕人 Hiroto ITOH 鬼沢 邦雄 Kunio ONIZAWA
発刊日:
公開日:
Butt-weldingPLR pipingResidual stress distributionScatter of welding conditionsStainless steelstress corrosion cracking
概要
Residual stress by welding would be one of the most significant factors in evaluating failure probabilities of PLR piping since the SCC growth behavior is strongly affected by residual stress distribution. The residual stress distribution is well known to ch ange caused by varying of welding conditions such as groove shape, electrical voltage and current, inter-pass temperature, etc. Therefore, to evaluate the scatter of welding condition and their influence on residual stress is important to assess the structura l integrity of PLR piping. In present work, the scatters of welding conditions were evaluated by producing some series of butt-welding pipe specimens made of stainless steel. Residual stress distributions due to welding were measured by applying X-ray diffra ction method and stress relief method. Measured welding conditions and residual stress distributions are provided to determine the conditions of welding residual stress simulations and to confirm an accuracy of the simulation described in the following paper.
