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

Korean Society of Pressure Vessels and Piping (한국압력기기공학회)
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Preliminary Review of On-Site Clamping Repair Technology for Welding Part Leakage of Safety Related Valve in the Nuclear Power Plant

원전용 안전등급 밸브의 용접부 누설 클램핑 현장보수 기술 검토

  • 김기홍 ((주)삼신 / 남서울대학교 대학원) ;
  • 김기수 ((주)삼신 / 남서울대학교 대학원) ;
  • 정환석 ((주)삼신 / 남서울대학교 대학원) ;
  • 장무경 ((주)삼신 / 남서울대학교 대학원)
  • Received : 2023.05.26
  • Accepted : 2023.06.23
  • Published : 2023.06.30
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Abstract

The welding part of the valve needs immediate action when leakage occurs due to cracks or damage. In order to repair leakage of the welding part, the valve must be separated from the pipe or replaced with a new valve. However, it is difficult to remove the valve while operating the power plant. This study presents a method to remove leakage by precisely processing the gap between the clamp and the incision part within 0.1mm while installed in the pipe system. If the external leakage is removed using a clamp on the welding part without removing the valve during operation, the time and cost required for maintenance can be reduced.

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References

  1. ASME BPVC Sec.III, 2015, "Rules for Constructions of Nuclear Facility Components" American Society of Mechanical Engineers, NY.
  2. KEPIC MN, 2015, "Nuclear Mechanical" Korea Electric Power Industry Code.
  3. ASME BPVC Sec.XI, 2015, "Rules for Inservice Inspection of Nuclear Power Plant Components" American Society of Mechanical Engineers, NY.
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