Abstract
The advanced surface modification process is known as a promising solution to improve the performance of machine components and systems, especially for vehicles, nuclear power plants, biomedical device, etc. There have been several successful applications of water jet peening and underwater laser peening to nuclear components in Japan since 2001 which resulted in inspection and repair cost savings. The prerequisite condition for the application of the advanced surface modification process to nuclear power plants is the approval of the American Society of Mechanical Engineers (ASME) Code Case, so performance criteria and requirements (PCRs) in the ASME Code Case for repair and maintenance of nuclear power components are explained. A challenging project to apply advanced surface modification processes, such as ultrasonic nanocrystal surface modification and air laser peening to new nuclear power plants and new canisters, was created with the goal to develop a technical basis and the PCRs for ASME Section III (New Manufacturing). The results of this work will be an ASME Section III Code Case which is currently in progress. An initial draft of the new Code Case with the intermediate results of this work is introduced. Four kinds of advanced surface modification processes are explained and compared briefly.
Highlights
There have been successful applications of water jet peening (WJP) and under water laser peening (ULP) to the maintenance of nuclear components in Japan since 2001 as listed in Table 1 [1].The prerequisite condition for the application of the advanced surface modification process to nuclear power plants in the USA, Korea, etc., is the approval of an American Society of Mechanical Engineers (ASME) Code Case
The WJP process satisfied the requirement of ASME Code Case N-729-6 and N-729-5
An ASME Code Case is a prerequisite condition to apply them in-service and considered a susceptible region mitigated to primary water stress corrosion cracking (PWSCC) or chloride-induced stress corrosion cracking (CISCC)
Summary
There have been successful applications of water jet peening (WJP) and under water laser peening (ULP) to the maintenance of nuclear components in Japan since 2001 as listed in Table 1 [1]. The prerequisite condition for the application of the advanced surface modification process to nuclear power plants in the USA, Korea, etc., is the approval of an ASME Code Case. Another challenging project was started to apply advanced surface modification processes, such as ultrasonic nanocrystal surface modification (UNSM) and air laser peening (ALP), to ASME Code. These four kinds of advanced surface modification processes are introduced and compared briefly Their PCRs are to be applied for repair and maintenance and which were registered in ASME Code Case for Section XI.
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