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Research on weld residual stress of dissimilar steel weld in thick-wall pressure pipe of nuclear power plant by the finite element simulation method
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Mingya CHEN1, 2, Weiwei YU1, 2, Yaolei HAN1, 2, Lei LIN1, 2, Qunjia PENG1, 2, Fangjie SHI1, 2, Wanxiang ZHAO1, 2
Journal of Mechanical Strength | 2025, 47(8) : 59 - 65
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Journal of Mechanical Strength | 2025, 47(8): 59-65
• Experimental Research·Testing Technology •
Research on weld residual stress of dissimilar steel weld in thick-wall pressure pipe of nuclear power plant by the finite element simulation method
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Mingya CHEN1, 2, Weiwei YU1, 2, Yaolei HAN1, 2, Lei LIN1, 2, Qunjia PENG1, 2, Fangjie SHI1, 2, Wanxiang ZHAO1, 2
Affiliations
  • 1.Suzhou Nuclear Power Research Institute Co., Ltd., Suzhou 215004, China
  • 2.National Nuclear Power Plant Safety and Reliability Engineering Research Center, Suzhou 215004, China
Published: 2025-08-15 doi: 10.16579/j.issn.1001.9669.2025.08.007
Outline
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In pressurized-water reactor nuclear power plants, the vessel nozzles of large carbon steel equipment such as reactor pressure vessel (RPV), steam generator (SG), and main pumps are connected to austenitic steel pipes through dissimilar metal welds (DMWs). The thick-walled DMW has material inhomogeneity and complex weld residual stress (WRS), which easily leads to the generation of fatigue or stress corrosion cracks.Firstly, the WRS of DMW in nuclear power plants obtained through international measurements and numerical analyses was investigated. Then, based on a rapid WRS simulation method for volume uniform heating of unit cells, the WRS of DMW in the hot leg of the primary loop (the connecting pipe section from RPV outlet to SG inlet, which is the pipe section with the highest operating parameters in the primary loop pressure boundary) was obtained.The numerical simulation results are consistent with the trend of the fitting envelope curve recommended by the United States, and the overall results can be enveloped by the fitting curve recommended by the United States, indicating that the described rapid WRS simulation method is feasible. The WRS of thick-walled DMW is relatively high, and the stress values at the inner and outer surfaces of the pipe are more conservative than the recommended values of the United States, suggesting that more safety margins can be obtained in actual structural analyses.

Pressurized-water reactor  /  Dissimilar steel weld  /  Weld residual stress  /  Numerical simulation
Mingya CHEN, Weiwei YU, Yaolei HAN, Lei LIN, Qunjia PENG, Fangjie SHI, Wanxiang ZHAO. Research on weld residual stress of dissimilar steel weld in thick-wall pressure pipe of nuclear power plant by the finite element simulation method[J]. Journal of Mechanical Strength, 2025 , 47 (8) : 59 -65 . DOI: 10.16579/j.issn.1001.9669.2025.08.007
Funding
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  • National Key Research & Development Program(2020YFB1901500)
  • National Natural Science Foundation of China(12075274)
Appendix
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Year 2025 volume 47 Issue 8
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Article Info
doi: 10.16579/j.issn.1001.9669.2025.08.007
  • Receive Date：2023-12-22
  • Online Date：2026-03-19
  • Published：2025-08-15
Article Data
Affiliations
History
  • Received：2023-12-22
  • Revised：2024-03-07
Funding
National Key Research & Development Program(2020YFB1901500)
National Natural Science Foundation of China(12075274)
Affiliations
    1.Suzhou Nuclear Power Research Institute Co., Ltd., Suzhou 215004, China
    2.National Nuclear Power Plant Safety and Reliability Engineering Research Center, Suzhou 215004, China

Corresponding:

PENG Qunjia, E-mail：
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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