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

Korean Society of Pressure Vessels and Piping (한국압력기기공학회)
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Finite Element Analysis of Pilgering Process of Multi-Metallic Layer Composite Fuel Cladding

다중금속복합층 핵연료 피복관의 필거링 공정에 관한 유한 요소 해석 연구

  • 김태용 (울산과학기술원, 기계항공 및 원자력 공학부) ;
  • 이정현 (울산과학기술원, 기계항공 및 원자력 공학부) ;
  • 김지현 (울산과학기술원, 기계항공 및 원자력)
  • Received : 2017.12.18
  • Accepted : 2017.12.27
  • Published : 2017.12.30
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Abstract

In severe accident conditions of light water reactors, the loss of coolant may cause problems in integrity of zirconium fuel cladding. Under the condition of the loss of coolant, the zirconium fuel cladding can be exposed to high temperature steam and reacted with them by producing of hydrogen, which is caused by the failure in oxidation resistance of zirconium cladding materials during the loss of coolant accident scenarios. In order to avoid these problems, we develop a multi-metallic layered composite (MMLC) fuel cladding which compromises between the neutronic advantages of zirconium-based alloys and the accident-tolerance of non-zirconium-based metallic materials. Cold pilgering process is a common tube manufacturing process, which is complex material forming operation in highly non-steady state, where the materials undergo a long series of deformation resulting in both diameter and thickness reduction. During the cold pilgering process, MMLC claddings need to reduce the outside diameter and wall thickness. However, multi-layers of the tube are expected to occur different deformation processes because each layer has different mechanical properties. To improve the utilization of the pilgering process, 3-dimensional computational analyses have been made using a finite element modeling technique. We also analyze the dimensional change, strain and stress distribution at MMLC tube by considering the behavior of rolls such as stroke rate and feed rate.

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References

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