원전용 밸브 패킹응력 해석을 위한 모델링 연구 (A MODELLING STUDY FOR PACKING STRESS ANALYSIS OF THE VALVE IN NUCLEAR POWER PLANTS)

서지정보

· 발행기관 : 한국전산유체공학회
· 수록지 정보 : 한국전산유체공학회지 / 28권 / 1호 / 123 ~ 131페이지
· 저자명 : 김재형, 이정희, 김상교, 이상혁

초록

The valve used in nuclear power plant must be qualified by the known experimental equation, which is the requirement of ASME QME-1 standard. Up to now, the stress on packing is assumed to be constant in design and experimental analysis. This paper deals with the development of analysis model for the packing stress. In the analysis model, the stress is calculated with the love function, whose eigen function is deduced by applying the separation method of axial and radial variables to biharmonic equation with boundary conditions. And the unkown parameters of love function are calculated by applying the remaining boundary conditions. The distribution of radial and axial stress are not constant and the big variation of stress is found at the inner and outer face. The radial stress after boundary layer of radial stress is 45% of gland packing stress. Considering the discussion that the double packing stress makes the radial stress in the packing as same as the fluid pressure, it is proper that the industrial design guide has been used to select the gland packing stress as twice as much as fluid pressure. And the force on stem can be calculated by applying shear stress of packing on stem area. Later, the load factor, which is used in the experimental analysis for consideration of stress distribution, must be related to the real stress distribution by this research result.

영어초록

The valve used in nuclear power plant must be qualified by the known experimental equation, which is the requirement of ASME QME-1 standard. Up to now, the stress on packing is assumed to be constant in design and experimental analysis. This paper deals with the development of analysis model for the packing stress. In the analysis model, the stress is calculated with the love function, whose eigen function is deduced by applying the separation method of axial and radial variables to biharmonic equation with boundary conditions. And the unkown parameters of love function are calculated by applying the remaining boundary conditions. The distribution of radial and axial stress are not constant and the big variation of stress is found at the inner and outer face. The radial stress after boundary layer of radial stress is 45% of gland packing stress. Considering the discussion that the double packing stress makes the radial stress in the packing as same as the fluid pressure, it is proper that the industrial design guide has been used to select the gland packing stress as twice as much as fluid pressure. And the force on stem can be calculated by applying shear stress of packing on stem area. Later, the load factor, which is used in the experimental analysis for consideration of stress distribution, must be related to the real stress distribution by this research result.

참고자료

· 없음