Transactions of the Korean Society of Pressure Vessels and Piping (한국압력기기공학회 논문집)

Korean Society of Pressure Vessels and Piping (한국압력기기공학회)
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Development of New Code Case "Mitigation of PWSCC and CISCC in ASME Code Section III Components by the Advanced Surface Stress Improvement Technology

일차수응력부식균열(PWSCC) 및 염화이온부식균열(CISCC) 저감용 표면개질기술 적용을 위한 코드케이스 개발

  • Received : 2019.02.21
  • Accepted : 2019.06.17
  • Published : 2019.06.30
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Abstract

In nuclear power plant operation and spent fuel canisters, it is necessary to provide a sound technical basis for the safety and security of long-term operation and storage respectively. Recently, the peening technology is being discussed and the technology will be adopted to ASME Section III, Division 1, Subsection NX (2019 Edition). The peening is prohibited in current edition, but it will be approved in 2019 Edition and adopted. However, Surface stress improvement techniques such as the peening is used to mitigate SCC susceptible in operating nuclear plants. Although the peening will be approved to ASME CODE, there are no performance criteria listed in the 2019 edition. The Korean International Working Group (KIWG) formed a new Task Group named "Advanced Surface Stress Improved Technology". The task group will develop a CODE CASE to address PWSCC(Primary Water Stress Corrosion Cracking) and CISCC(Chloride Induced Stress Corrosion Cracking) for new ASME Section III components. TG-ASSIT was started to make peening performance criteria for ASME Section III (new fabrication) applications. The objective of TG-ASSIT is to gain consensus among the relevant Code groups that requirements/mitigation have been met.

Keywords

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Fig. 1 Laser peening system for reactor vessel head

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Fig. 2 UNSM device and conceptual diagram

Table 1 The sample of the peening acceptance criteria

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References

  1. Dennis P. Weakland, Glenn White and Paul Crooker, 2016, "Incorporating Peening Into ASME Section XI Code Cases N-729 and N-770 for PWSCC Mitigation in Alloy 82/182/600 Locations". Proc. Of ASME 2016 PVP Conference, Vancouver, BC, July 17-21, PVP2016-64008.
  2. John H Jackson, Denise Paraventi, Michael Wright, 2017 "Topical Report for Primary Water Stress Corrosion Cracking Mitigation by Surface Stress Improvement" Electric Power Research Institute, Palo Alto, CA, MRP-267
  3. ASME BPVC Sec.XI, Code Case N-729-6, 2017, "Alternative Examination Requirements for PWR Reactor Vessel Upper Heads With Nozzles Having Pressure-Retaining Partial-Penetration Welds," American Society of Mechanical Engineers, NY.
  4. ASME BPVC Sec.XI, Code Case N-770-5, 2017, "Alternative Examination Requirements and Acceptance Standards for Class 1 PWR Piping and Vessel Nozzle Butt Welds Fabricated With UNS N06082 or UNS W86182 Weld Filler Material with or Without Application of Listed Mitigation Activities," American Society of Mechanical Engineers, NY.
  5. EPRI, 2016, Materials Reliability Program : Topical Report for Primary Water Stress Corrosion Cracking Mitigation by Surface Stress Improvement, Electric Power Research Institute, Palo Alto, CA: MRP-335, Revision 3-A
  6. EPRI, 2016, Materials Reliability Program: Technical Basis for Primary Water Stress Corrosion Cracking Mitigation by Surface Stress Improvement, Electric Power Research Institute, Palo Alto, CA, MRP-267, Revision 2