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Ni-63 방사선동위원소와 반도체를 이용한 원자력전지 전력향상을 위한 개념설계
유봉(Bong Yoo),정현규(H.K. Jung) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Micro-electromechanical Systems (MEMS) comprise a rapidly expanding research field with potential applications varying from sensors to more recent optical applications. Depending on the application, these devices often require an on-board power source for remote operation, especially in medical cases requiring operation for an extended period of time. Suggested power sources include fuel cells and solar energy, but nuclear power sources may provide significant advantages for certain applications. Hence, the objective of this study is to suggest a conceptual design of a nuclear battery using Ni63 radioisotope and semiconductors to increase power of betavoltaic battery in the range of from uW to mW, which could expand the application of the nuclear battery for supplying a power to realistic MEMS and sensor devices.
Seismic Analysis of Absorber Rod in KMRR Reactivity Control Mechanism
조영갑,유봉,김태룡,안규석,Cho, Yeong-Carp,Yoo, Bong,Kim, Tae-Ryong,Ahn, Kyu-Suk Computational Structural Engineering Institute of 1990 전산구조공학 Vol.3 No.3
This study is on a seismic analysis of absorber rod in KMRR Reactivity Control Mechanism. The model being studied is two coaxial tubes(control absorber rod and flow tube) immersed in the water and partially coupled(overlap) by water gap. The hydrodynamic mass effects by the water in each surrounding conditions are considered in the model. The natural frequencies, stresses and displacements of the system due to Safe Shutdown Earthquake are computed in the cases of in-phase modes and out-of-phase modes of two coaxial tubes. The results show that maximum stresses are well below the allowable limit but the maximum displacements at the ends of both tubes are so much that the absorber rod contacts with the flow tube(or surrounding wall). 본 연구에서는 다목적연구로 반응도제어장치의 제어봉에 대한 내진해석을 수행하였다. 해석모델은 물속에 잠겨있는 두개의 관(중성자흡수봉 및 유동관)이 동심축상에 있으며 부분적으로 중첩된 두 관끝단의 유체틈에 의해 서로 동적으로 연결되어 있다. 유체에 의한 동적질량을 고려한 고유진동수를 구하고 안전정지지진에 의해 발생하는 최대응력과 최대변위를 동위상 및 역위상 거동별로 각각 구하였다. 해석결과 최대응력은 허용치보다 작게 나타나 구조적인 건전성은 입증되었으나, 최대변위는 두 개의 관이 서로 부딪히고 중성자흡수봉은 주위의 다른 벽에도 부딪히는 현상을 수발함을 알 수 있었다.
이형연,이재한,유봉,Lee, Hyeong-Yeon,Lee, Jae-Han,Yoo, Bong 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.7
An approximate weight function technique using the indirect boundary integral equation has been presented for the analysis of stress intensity foactors(SIFs) of a thick pipe. One-term boundary integral was introduced to represent the crack surface displacement field for the displacement based weight function technique. An explicit closed-form SIF solution applicable to symmetric cracked pipes without any modification of the solution including both circumferential and radial cracks has been derived. The necessary information in the analysis is two or three reference SIFs. In most cases the SIF solution were in good agreement with those available in the literature.
3차원 면진장치를 이용한 URANUS 액체금속로의 지진응답감소
이국희,김윤재,류강묵,황일순,유봉,Lee, Kuk-Hee,Kim, Yun-Jae,Ryu, Kang-Mook,Hwang, Il Soon,Yoo, Bong 한국압력기기공학회 2011 한국압력기기공학회 논문집 Vol.7 No.3
URANUS (Ubiquitous, Robust, Accident-forgiving, Non-proliferating, Ultra-lasting and Sustainer) has been developed with 35MWe (100MWth) operating without primary coolant pump, capitalizing on natural circulation capability of lead-bismuth eutectic (LBE) for long-life small and robust power units. To ensure the structural integrity, the large safety margin against Safe Shutdown Earthquake, 0.3g, and furthermore the cost effectiveness for URANUS, three-dimensional seismic base isolation design has been developed. The analytical model has been developed and seismic time history analyses have been carried out. The advantage for using three-dimensional seismic base isolation for URANUS has been discussed.
PASCAR 액체금속로의 3 차원 면진 장치가 가속도 응답과 응력에 미치는 영향
이국희(Kuk-Hee Lee),김윤재(Yun-Jae Kim),한재준(Jae-Jun Han),황일순(Il Soon Hwang),유봉(Bong Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
PASCAR(Proliferation-resistant, Accident-tolerant, Self-supported, Capsular and Assured Reactor) has been developed with 35MWe(100MWth) operating without primary coolant pump, capitalizing on natural circulation capability of lead-bismuth eutectic(LBE) for long-life small and robust power units. To ensure the structural integrity, the large safety margin against Safe Shutdown Earthquake, 0.3g, and furthermore the cost effectiveness for PASCAR, 3-D seismic base isolation design has been developed. The analytical model has been developed and seismic time history analyses has been carried out. The advantage for using 3-D seismic base isolation for PASCAR has been discussed.