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Optimum Design for External Reinforcement to Mitigate Deteioration of a Nuclear Reactor Lower Head under Temperature Elevation

원자로 하부구조의 온도상승에 따른 열화를 완화하기 위한 외벽보강 최적설계

  • Kim, Kee-Poong (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Hyun-Sup ;
  • Huh, Hoon (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Park, Jae-Hong (Regulation Technology Research Center, Korea Institute of Nuclear Safely) ;
  • Lee, Jong-In
  • 김기풍 (한국과학기술원 기계공학과) ;
  • 김현섭 ((주) 기아자동차) ;
  • 허훈 (한국과학기술원 기계공학과) ;
  • 박재홍 (한국원자력안전기술원 규제기술연구부) ;
  • 이종인 (한국원자력안전기술원 규제기술연구부)
  • Published : 2000.11.01

Abstract

This paper is concerned with the optimum design for external reinforcement of a nuclear reactor pressure vessel(RPV) in a severe accident. During the severe reactor accident of molten core, the temperature and the pressure in the nuclear reactor rise to a certain level depending on the initial and subsequent condition of a severs accident. The reis of the temperature and the internal pressure cause deterioration of the load carrying capacity and could cause failure of the RPV lower head. The deterioration of failure can be mitigated by the external cooling or the reinforcement of the lower head with additional structures. While the external cooling forces the temperature of an RPV to drop to the desired level, the reinforcement of the lower head can attain both the increase of the load carrying capacity and the temperature drop. The reinforcement of the lower head can be optimized to have the maximum effect on the collapse pressure and the temperature at the inner wall. Optimization results are compared to both the result without the reinforcement and the result with the designated reinforcement.

Keywords

Nuclear Reactor Lower Head;Severe Accident;Optimum Design;Finite Element Limit Analysis;Thermal Analysis

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