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

Korean Society of Pressure Vessels and Piping (한국압력기기공학회)
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Modelling Heat Transfer Through CRUD Deposited on Cladding Tube in UNIST-DISNY Facility

UNIST-DISNY 설비 피복관에 침적된 크러드의 열전달 모델링

  • Seon Oh YU (Korea Institute of Nuclear Safety, Univ. of Science and Technology) ;
  • Ji Yong Kim (Ulsan National Institute of Science and Technology) ;
  • In Cheol Bang (Ulsan National Institute of Science and Technology)
  • Received : 2023.11.09
  • Accepted : 2023.12.15
  • Published : 2023.12.30
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Abstract

This study presents a CRUD modelling to simulate the thermal resistance behavior of CRUD, deposited on the surface of a cladding tube of a fuel assembly. When heat produced from fuels transfers to a coolant through a cladding tube, the CRUD acting as an additional thermal resistance is expressed as two layers, i.e., a solid oxide layer and an imaginary fluid layer, which are added to the experimental tube's heat structure of the MARS-KS input data. The validation calculation for the experiments performed in UNIST-DISNY facility showed that the center and surface temperatures of the cladding tube increased as the porosity and the steam amount inside pores of the CRUD got higher. In addition, the temperature gradient in the imaginary fluid layer was calculated to be larger than that in the solid oxide part, indicating that the steam amount inside the layer acted more largely as thermal resistance. It was also evaluated through sensitivity calculations that the cladding tube temperature was more sensitive to the CRUD porosity and the steam amount in pores than to the inlet flow rate of the coolant.

Keywords

Acknowledgement

본 연구는 원자력안전위원회의 재원으로 한국원자력안전재단의 지원을 받아 수행한 원자력안전연구 원자력안전규제기술개발 사업의 연구결과입니다(No. 2106022).

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