Residual stress distribution analysis in a J-groove dissimilar metal welded component of a reactor vessel bottom head using simulation and experiment
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To simulate the verification process using materials from a decommissioned reactor, a mock-up of the bottommounted instrument nozzle in the Kori 1 reactor, where the nozzle was attached to a plate by J-groove dissimilar metal welding, was fabricated. The mock-up distortion was quantified by measuring the plate surface displacement after welding. The residual stresses formed on the support plate surface and the inner surface of the nozzle were then analyzed using the hole-drilling method, contour method, and neutron diffraction. Welding simulations were performed using a 3D finite element method to validate the measured results. The measured and computed stress distributions on the support plate exhibited reasonable agreement. Conversely, the stresses on the inside of the nozzle were found to have an indisputable difference in the contour method and neutron diffraction measurements, which demonstrated strong tensile and compressive hoop stresses, respectively. The possible origins of such differences were investigated and we have provided some suggestions for a precise evaluation in the simulation. This study is expected to be useful in future research on decommissioned reactors.
Abstract
To simulate the verification process using materials from a decommissioned reactor, a mock-up of the bottommounted instrument nozzle in the Kori 1 reactor, where the nozzle was attached to a plate by J-groove dissimilar metal welding, was fabricated. The mock-up distortion was quantified by measuring the plate surface displacement after welding. The residual stresses formed on the support plate surface and the inner surface of the nozzle were then analyzed using the hole-drilling method, contour method, and neutron diffraction. Welding simulations were performed using a 3D finite element method to validate the measured results. The measured and computed stress distributions on the support plate exhibited reasonable agreement. Conversely, the stresses on the inside of the nozzle were found to have an indisputable difference in the contour method and neutron diffraction measurements, which demonstrated strong tensile and compressive hoop stresses, respectively. The possible origins of such differences were investigated and we have provided some suggestions for a precise evaluation in the simulation. This study is expected to be useful in future research on decommissioned reactors.
참고문헌 (22)
- K. Fujimoto, "Post-irradiation examination using TEM method for swelling evaluation of baffle plate in PWR core internals", Proceeding 54th Annu. Meet. Hot Lab. Remote Handl. Work. Gr., HOTLAB 2017) (2017)
- S. S. Hwang, "Failure evaluation plan of a reactor internal components of a decommissioned plant", Corros. Sci. Technol, 20, pp.189~195 (2021)[DOI]
- South Texas Project Unit 1 Bottom Mounted Instrumentation Nozzles (#1 and #46) Analysis Reports and Related Documentation, "Materials Reliability Program", ~, pp.MRP-102 (2003)
- Palo Verde Nuclear Generating Station (PVNGS) Unit 3, Docket No. STN 50-530, License No. NPF 74, , ~, pp.Licensee Event Report 2013- 001-00 (2014)
- "Stress Corrosion Cracking in Light Water Reactors: Good Practices and Lessons Learned" (2011)[URL]
- C. Liu, "Three-dimensional finite element simulation of welding residual stress in RPV with two J-groove welds", Weld. World, 61, pp.151~160 (2017)[DOI]
- S. Das Banik, "Distortion and residual stresses in thick plate weld joint of austenitic stainless steel:experiments and analysis", J. Mater. Process. Technol, 289, pp.116944~ (2021)[DOI]
- R. Kumar, "Numerical and experimental investigation on distribution of residual stress and the influence of heat treatment in multi-pass dissimilar welded rotor joint of alloy 617", 10Cr steel, 2022, pp.199, 104715~
- P. Xie, "Evaluation of residual stresses relaxation by post weld heat treatment using contour method and X-ray diffraction method", Exp. Mech, 55, pp.1329~1337 (2015)[DOI]
- S. Zhang, "Experimental characterisation and numerical modelling of residual stresses in a nuclear safe-end dissimilar metal weld joint", Metals, 11, pp.1298~ (2021)[DOI]
- Y. Wan, "Weld residual stresses in a thick plate considering back chipping: neutron diffraction, contour method and finite element simulation study", Mater. Sci. Eng, 699, pp.62~70 (2017)[DOI]
- W. Woo, "Throughthickness distributions of residual stresses in two extreme heat-input thick welds: a neutron diffraction, contour method and deep hole drilling study", Acta Mater, 61, pp.3564~3574 (2013)[DOI]
- W. Woo, "Residual stress determination in a dissimilar weld overlay pipe by neutron diffraction", Mater. Sci. Eng, 528, pp.8021~8027 (2011)[DOI]
- "MRP-317, Revision 1), Material Reliability Program: Welding Residual Stress Dissimilar Metal Butt-Weld Finite Element Modeling Handbook" (2015)
- S. -H. Lee, "Residual stress assessment of nickel-based alloy 690 welding parts", Eng. Fail. Anal, 54, pp.57~73 (2015)[DOI]
- H. -Y. Bae, "Sensitivity analysis of finite element parameters for estimating residual stress of J-groove weld in RPV CRDM penetration nozzle", Trans. Korean Soc. Mech. Eng. A, 36, pp.1115~1130 (2012)[DOI]
- T. -K. Song, "Assessment of round robin analyses results on welding residual stress prediction in a nuclear power plant nozzle", Trans. Korean Soc. Mech. Eng. A, 33, pp.72~81 (2009)[DOI]
- "A.S. for T. and Materials, Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method" (2020)[URL]
- Y. Zhang, "Cross-sectional mapping of residual stresses in a VPPA weld using the contour method", Acta Mater, 52, pp.5225~5232 (2004)[DOI]
- W. Woo, "Effect of wavelength-dependent attenuation on neutron diffraction stress measurements at depth in steels", J. Appl. Crystallogr, 44, pp.747~754 (2011)[DOI]
- T. Pirling, "Precise determination of residual stresses in large specimens by neutron diffraction", Mater. Sci. Forum, 652, pp.80~85 (2010)[DOI]
- K. Ogawa, "Investigations on welding residual stresses in penetration nozzles by means of 3D thermal elastic plastic FEM and experiment", Comput. Mater. Sci, 45, pp.1031~1042 (2009)[DOI]