炉内計装筒管台溶接部およびその補修溶接時を 想定した残留応力解析
Numerical Analysis of Residual Stress by J-weld and Repair Weld of Bottom Mounted Instrument Nozzles in Reactor Vessel Penetration
著者:
望月 正人 Masahito MOCHIZUKI 岡野 成威 Shigetaka OKANO 柏山 忠義 Tadayoshi KASHIYAMA 丹羽 悠介 Yusuke NIWA 亀山 雅司 Masashi KAMEYAMA 中野 守人 Morihito NAKANO
発刊日:
公開日:
Bottom Mounted Instrument nozzlesJ-weldsMounting angleRepair weldingResidual stress analysisWelding conditions
概要
In this study, a fast simulation technique of Iterative Substructure Method (ISM) was applied for numerical analysis of the distribution of residual stress by J-weld and repair weld of Bottom Mounted Instrument (BMI) nozzle in reactor vessel penetration. The calculated results were compared with the measured values to validate the constructed residual stress analysis model. The effect of BMI mounting angles on distribution of residual stress at J-welds was investigated. Based on the results, similarity and difference in residual stress distribution among different BMI mounting angles were discussed. Additionally, repair welding having straight weld bead around BMI was simulated to estimate the distribution of residual stress at repair welds. As the results, the distribution of residual stress at repair welds was not sensitive to welding heat input and pass sequence conditions. It was concluded that the residual stress analysis models constructed for BMI nozzles was useful to investigate the effect of several factors on the distribution of residual stress around the BMI nozzles.
