underwater welding
Energy
Procedia
Energy Procedia 00 (2011)16 (2012) 153 – 158
Energy Procedia 000–000 www.elsevier.com/locate/procedia 2012 International Conference on Future Energy, Environment, and Materials
Applications of Underwater Laser Peening in Nuclear Power
Plant Maintenance
Jialei Zhu*,Xiangdong Jiao,Canfeng Zhou,Hui Gao
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
Abstract
Stress corrosion cracking is the major threat to the safe and stable operation of nuclear power plants, and the residual tensile stress is one of its major causes. For in-service nuclear power plants, the most effective means to prevent stress corrosion cracking is change the stress status of material surface by peening technology. Compared with traditional shot peening, laser peening has advantages of good directionality, good accessibility,easy to control ,no residue ,deeper compressed layer ,and more suited to use in the maintenance of in-service nuclear power plants. In this paper, research and application of underwater laser peening technology in nuclear power plant maintenance are summarized. © 2011 Published by Elsevier B.V. Selection and/or peer-review under responsibility of International Materials Science Society.
© 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [name organizer]
Keywords: Nuclear power; in-service maintenance;laser peening;underwater
1. Introduction
There are more than 400 nuclear power plants in the world. It is a very important issue to operate them safely and stably. Stress corrosion cracking(SCC)is the major factor to reduce the reliability of aged reactor components, which may cause unscheduled outages and reduce availability. Initiation and propagation of SCC due to three factors, which must be present simultaneously: metallurgical susceptibility, critical environment,and static(or sustained) tensile stresses. For nuclear power
Procedia
Energy Procedia 00 (2011)16 (2012) 153 – 158
Energy Procedia 000–000 www.elsevier.com/locate/procedia 2012 International Conference on Future Energy, Environment, and Materials
Applications of Underwater Laser Peening in Nuclear Power
Plant Maintenance
Jialei Zhu*,Xiangdong Jiao,Canfeng Zhou,Hui Gao
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
Abstract
Stress corrosion cracking is the major threat to the safe and stable operation of nuclear power plants, and the residual tensile stress is one of its major causes. For in-service nuclear power plants, the most effective means to prevent stress corrosion cracking is change the stress status of material surface by peening technology. Compared with traditional shot peening, laser peening has advantages of good directionality, good accessibility,easy to control ,no residue ,deeper compressed layer ,and more suited to use in the maintenance of in-service nuclear power plants. In this paper, research and application of underwater laser peening technology in nuclear power plant maintenance are summarized. © 2011 Published by Elsevier B.V. Selection and/or peer-review under responsibility of International Materials Science Society.
© 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [name organizer]
Keywords: Nuclear power; in-service maintenance;laser peening;underwater
1. Introduction
There are more than 400 nuclear power plants in the world. It is a very important issue to operate them safely and stably. Stress corrosion cracking(SCC)is the major factor to reduce the reliability of aged reactor components, which may cause unscheduled outages and reduce availability. Initiation and propagation of SCC due to three factors, which must be present simultaneously: metallurgical susceptibility, critical environment,and static(or sustained) tensile stresses. For nuclear power
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