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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

飛田 徹; 勝山 仁哉  ; 伊藤 裕人; 鬼沢 邦雄 

Tobita, Toru; Katsuyama, Jinya; Ito, Hiroto; Onizawa, Kunio

再循環系配管の溶接部に見いだされている応力腐食割れの進展挙動は、溶接により発生する残留応力の影響を受けることが知られている。溶接残留応力は、開先形状,入熱量あるいはパス間温度などの溶接条件のばらつきにより変化する。そこで本研究では、再循環系配管等におけるステンレス鋼の突合せ溶接継手部を対象に、複数体の溶接試験体製作時における入熱量や溶接速度等の溶接条件のばらつき、及び製作した配管溶接試験体の溶接残留応力及びそのばらつきについて測定を行った。その結果、単一パス中の入熱量や速度等のばらつきは小さいことを確認し、複数パスごとの溶接条件を把握するとともに、異なる開先形状,パス数,入熱量制限等の溶接条件に伴う溶接残留応力分布の相違を明らかにした。

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 change caused by varying of welding conditions. Therefore, to evaluate the scatter of welding condition and their influence on residual stress is important to assess the structural 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 diffraction 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.

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