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영구자석 노화에 따른 제어봉 위치지시기의 성능변화 예측
유제용(Je-Yong Yu),김지호(Ji-Ho Kim),허형(Hyung Huh),최명환(Myoung-Hwan Choi),손동성(Dong-Seong Sohn) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The Control Element Drive Mechanism (CEDM) for the integral reactor is designed to raise and lower the control rod in steps of 2㎜ in order to satisfy the design features of the integral reactor which are the soluble boron free operation and the use of a nuclear heating for the reactor start-up. The actual position of the control rod could be achieved to sense the magnet connected to the control rod by the position indicator around the upper pressure housing of CEDM. It is sufficient that the actual position information of control rod at 20㎜ interval from the position indicator is used for the core safety analysis. As the magnet moves upward along the position indicator assembly from the bottom to the top in the upper pressure housing, the output voltage increases linearly step-wise at 0.2VDC increments. Between every step there are transient areas which occur by a contact closing of three reed switches which is the 2-3-2 contact closing sequence. In this paper the output voltage signal corresponding to the position of control rod was estimated on the 2-1-2 contact closing sequence due to the aging of the magnet.
내지진용 리드스위치를 이용한 일체형원자로용 위치지시기 개발
유제용(Je-Yong Yu),김지호(Ji-Ho Kim),허형(Hyung Huh),최명환(Myoung-Hwan Choi),손동성(Dong-Seong Sohn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The reed switch position transmitter (RSPT) is used as a position indicator for the control rod in commercial nuclear power plants made by ABB-CE. But this position indicator has some problems when directly adopting it to the integral reactor. The Control Element Drive Mechanism (CEDM) for the integral reactor is designed to raise and lower the control rod in steps of 2㎜ in order to satisfy the design features of the integral reactor which are the soluble boron free operation and the use of a nuclear heating for the reactor start-up. Therefore the resolution of the position indicator for the integral reactor should be achieved to sense the position of the control rod more precisely than that of the RSPT of the ABB-CE. This paper adopts seismic resistance reed switches to the position indicator in order to reduce the damages or impacts during the handling of the position indicator and earthquake.
안창기(Chang gi Ahn),유제용(Je Yong Yu),박진석(Jin Seok Park),함지웅(Ji Woong Ham) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
RCP(Reactor coolant pump) must be designed to preserve its functions on normal or abnormal environments and seismic event same as operating basis earthquake(OBE) and safe shutdown earthquake(SSE). Generally, there are static and dynamic analytical method which can be applied by a floor response spectrum or time history analysis for the seismic qualification. Initially, It was accomplished a detailed structural FE-model for finite element analysis on the bases of 3-dimensional solid model which was made by the RCP drawing. As the result of dynamic characteristic using the detailed FE-model, its shown about 12Hz natural frequency of 1st bending mode shape and maximum displacement has 11mm with the structural bending by single-point response spectrum(SPRS) method at all elevation. But maximum displacement has 7.6mm by multi-point response spectrum(MPRS) method which was applied to the three floor response spectrum at each elevation. Therefore, On a large heighten structures as RCP, The application by SPRS method causes to be more conservative results. Finally, A simpled equivalent beam model which was developed by use of iteration of detailed FE-model is shown the result more similar with those of natural frequencies and SPRS analysis. And maximum equivalent stress and displacement of the simpled beam has verified with 180MPa and 7.1mm each at 15sec as results by SSE time history method.
이지훈(Jihoon Lee),정재호(Jaeho Jung),유제용(Je-Yong Yu) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
This research investigated the static and dynamic characteristics of fluid dynamic bearings in a pump which support the rotor of pump. We numerically proved the effect of multi-lobe fluid film bearings with three lobes on pressure, load capacity, stiffness and damping coefficients. We also proposed an advanced design for multi-lobe fluid film bearings with trapezoid shape tapered groove to compensate for the increase in the pressure generation. The proposed fluid film bearing with trapezoid shape tapered grooves and decreasing the width of axial grooves improve the static and dynamic characteristics with the original one.