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Fatigue Characteristics of Spent Nuclear Fuel Rod During NCT
Joongjin Kim,Kyounghong Kim,Sangjin Park,Joonkyoo Park,Hyeongkoo Kim 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Korean MMTT project has been launched in order to clarify the vibration and shock loads under normal condition and transportation (NCT) in Korean geological and transportation conditions and to evaluate the integrity of SNF under such a transportation load. To evaluate the integrity of the SNF during normal land and sea transport tests, a representative SNF that represents the entirety of the different types of SNFs stored in the spent fuel pool of the power plant should be selected. And, it is necessary to make the test assembly to have a statically and dynamically similar behavior with the actual SNF. Therefore, in this project, we selected two types of fuel assembly that are expected to exhibit relatively conservative behavior under NCT, and these assemblies are being fabricated into surrogate test assemblies to have a similar characteristic as actual SNF based on the accumulated data from the poolside examination and the hot cell test so far. Tests were conducted for NCT conditions. In addition, a fatigue test was performed to integrity of the nuclear fuel rods under NCT conditions. Nuclear fuel assemblies are transported while being laid inside the cask under NCT, and are exposed to external shocks and vibrations. At this time, the fuel rod between the grid and grid is exposed to bending motion by this external force. For this simulation, a fixture was developed and used for static bending tests and bending fatigue tests. To simulate spent nuclear fuel rod specimens, hydrogen reorientation Zry-4 cladding was used and simulated pellets made of stainless steel were applied. And also, it was bonded using epoxy to give bonding conditions between the inside and the pellet. As a result of the test, cracks occurred due to the concentrated load between the pellets, resulting in damage to the fuel rod. The fatigue results showed a similar trend compared to the results performed by ORNL, and the lower bound fatigue curve presented by NUREG-2224 was also satisfactory.
Park, Joongjin,Lim, Min-Cheol,Ryu, Hyunil,Shim, Jiwook,Kim, Sun Min,Kim, Young-Rok,Jeon, Tae-Joon The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.25
<P>A versatile nanopore sensing platform to detect any aptamer using nanopores by designing DNA hairpins that are complementary to the aptamer is described. This platform can detect the presence of aptamer binding targets regardless of their size, which has been a major hurdle for nanopore detection systems. Moreover, the signal-to-noise ratio is increased by eliminating most of the unwanted substances from the sample <I>via</I> simple sample preparation steps. To detect <I>Bacillus thuringiensis</I> HD-73 spores using this sensing platform, DNA hairpins complementary to the target-specific aptamers were designed, and the hairpins were characterized using alpha-hemolysin nanopores after the reaction of spores and aptamers and subsequent reaction with the complementary DNA hairpins. The platform exhibited a detection limit as low as 1.2 × 10<SUP>1</SUP> CFU mL<SUP>−1</SUP> and was compatible with a wide range of spore concentrations from 1.2 × 10<SUP>1</SUP> CFU mL<SUP>−1</SUP> to 1.2 × 10<SUP>6</SUP> CFU mL<SUP>−1</SUP> while it is still expandable to higher spore concentrations.</P>
Evaluation of Fretting Wear on Spent Nuclear Fuel Rods During Transport
Jinseon Kim,Youngik Yoo,Joongjin Kim,Joonkyoo Park,Hyeongkoo Kim 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Flow-induced vibration can lead to fretting wear damage of fuel rods and spacer grids in nuclear reactors. Similarly, during the transport of spent nuclear fuel assemblies, continuous vibration and intermittent impact might also result in fretting wear due to dynamic interaction. Therefore, it is important to evaluate fuel rod damage due to fretting wear under such transport conditions. This study examines spent nuclear fuel rod specimens fabricated with hydride cladding tubes and simulated pellets, with hydrogen content ranging from 200 to 700 ppm and oxide film thickness ranging from 25 to 100 micrometers. Tests were conducted under a worst-case scenario, assuming continuous exposure to that condition during the expected transport time. Results indicate that the wear depth of all rod specimens occurred within the oxide film, suggesting a high resistance to fretting wear during transportation.
윤곽선과 곡선 보간법을 이용한 그림 그리는 로봇 시스템
박중진(Joongjin Park),김대은(DaeEun Kim) 제어로봇시스템학회 2018 제어·로봇·시스템학회 논문지 Vol.24 No.12
It is a challenging issue to design picture-drawing robots. It needs to handle how to control robot motions properly and efficiently. We propose an efficient method of how to transform a given image into a set of robot motions. Initially it extracts the edges of a target image and builds a set of line contours for drawing. It involves with the curve interpolation to match the image as well as lead to smooth transition of robot motions. We also compute the effective path of robot motions to draw a picture. Thus, the suggested method can reduce the moving cost and time and improve the accuracy of motion to complete drawing a target image.
서울시 명동 관광특구 가로환경의 무장애 디자인 개선방향 연구
김대희(Kim, Daehee),신중진(Shin, Joongjin) 대한건축학회 2016 대한건축학회논문집 Vol.32 No.12
Despite worldwide growth of tourism industry and increasing interest towards the mobility handicapped individuals and domestic tourist sites, there are only few barrier free facilities. Even if there are facilities, they need to be improved since there are increasing problems in management and supervision. Thus, this study is intended to establish evaluation system of street environment through analyzing domestic and foreign legal systems and guidelines, also to propose direction of improvement by investigating barrier free street environment of the main commercial street in Myeong-dong special tourism zone. The results of this study are as follow; first, various perspectives and different guidelines for each program should be developed. second, the government should provide an institutional strategy to expand and improve the facilities for transportation vulnerable. Third, detailed guidelines for barrier free facilities should be developed to minimize errors of installation by individuals. Fourth, relevant institutions should secure pedestrian safety and accessibility for transportation vulnerable through the continuous management and supervision.