• Title/Summary/Keyword: simulated fuel

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A Study on the Sintering of Simulated DUPIC Fuel (모의 DUPIC 핵연료의 소결 특성 연구)

  • 강권호;배기광;박희성;송기찬;문제선
    • Journal of Powder Materials
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    • v.7 no.3
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    • pp.123-130
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    • 2000
  • The simulated DUPIC fuel provides a convenient way to investigate fuel properties and behaviours such as thermal conductivity, thermal expansion, fission gas release, leaching and so on. Several pellets simulating the composition and microstructure of the DUPIC fuel were fabricated from resintering powder through the OREOX process of the simulated spent fuel pellets, which were prepared from the mixture of stable forms of constituent nuclides. This study describes the powder treatment, OREOX, compaction and sintering to fabricate simulated DUPIC fuel using the simulated spent fuel. The homogeneity of additives in the powder was observed after attrition milling. The microstructure of the simulated spent fuel was in agreement with the previous studies. The densities and the grain size of simulated DUPIC fuel was pellets are higher than those of simulated spent fuel pellets. Small metallic precipitates and oxide precipitates were observed on matrix grain boundaries.

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Fabrication of Nitride Fuel Pellets by Using Simulated Spent Nuclear Fuel (모의 사용후 핵연료를 이용한 질화물 핵연료 소결체 제조)

  • Ryu, Ho-Jin;Lee, Jae-Won;Lee, Young-Woo;Lee, Jung-Won;Park, Geun-Il
    • Journal of Powder Materials
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    • v.15 no.2
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    • pp.87-94
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    • 2008
  • In order to investigate a nitriding process of spent oxide fuel and the subsequent change in thermal properties after nitriding, simulated spent fuel powder was converted into a nitride pellet with simulated fission product elements through a carbothermic reduction process. Nitriding rate of simulated spent fuel was decreased with increasing of the amount of fission products. Contents of Ba and Sr in simulated spent fuel were decreased after the carbothermic reduction process. The thermal conductivity of the nitride pellet was decreased by an addition of fission product element but was higher than that of the oxide fuel containing fission product elements.

Elastic Modulus Measurement of a Dry Process Fuel Pellet by Resonant Ultrasound Spectroscopy (초음파 공진 분석법을 이용한 건식공정 핵연료 소결체의 탄성계수 측정)

  • 류호진;강권호;문제선;송기찬;정현규;정용무
    • Journal of Powder Materials
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    • v.11 no.4
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    • pp.314-321
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    • 2004
  • The elastic moduli of simulated dry process fuels with varying composition and density were measured in order to analyze the mechanical properties of a dry process fuel pellet. Resonant ultrasound spectroscopy(RUS) which can determine all elastic moduli with one set of measurements for a rectangular parallelepiped sample was used to measure the elastic moduli of UO$_{2}$ and simulated dry process fuel. The simulated dry process fuel showed a higher value of Young's modulus than UO$_2$ due to the presence of metallic precipitates and solid solution elements in the UO$_{2}$ matrix. The correlation between Young's modulus and porosity(P) of simulated dry process fuel was found to be 231.4-651.8 P (GPa) at room temperature. Dry process fuel with a higher burnup showed higher Young's modulus because total content of fission product element was increased.

Oxidation Behavior of the Simulated Supent Fuel at 400-$700^{\circ}C$ (400-700 $^{\circ}C$의 온도범위에서 모의 핵연료의 산화거동)

  • 강권호
    • Journal of Powder Materials
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    • v.6 no.3
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    • pp.209-214
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    • 1999
  • The oxidation behavior of the simulated spent fuel of burn up 33 MWD/kgU was investigated to predict that of the spent fuel in the temperature ranges of 400 to $700^{\circ}C$ and was compared with those of $UO_2$. The forms of uranium oxides after the oxidation were conformed by XRD analyses. The oxidation rate at each the temperature and the activation energy were obtained. After complete oxidation, the simulated spent fuel was converted to $U_3O_8$ and pulverized to powder due to the density difference between the simulated spent fuel and uranium oxides. The activation energies were 85.35 and 30.77kJ/mol in the temperature ranges of 400$\leq$T($^{\circ}C$)$\leq$500 and 500$\leq$T($^{\circ}C$)$\leq$700, respectively.

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Study on Lab-scale Production of Simulated e-Gasoline and Analysis of Spray Characteristics (모사 합성 가솔린 제조 및 분무 특성 분석 연구)

  • Jeonghyun Park;Naeun Choi;Suhan Park
    • Journal of ILASS-Korea
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    • v.28 no.4
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    • pp.176-183
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    • 2023
  • Many countries are striving to reduce carbon emissions with the goal of net zero by 2050. Accordingly, vehicles are rapidly being electrified to reduce greenhouse gases in the transportation sector. However, many organizations predict that internal combustion engines of LDV (light-duty vehicle) will exist even in 2050, and it is difficult to electrify aircraft and large ships in a short time. Therefore, synthetic fuel (i.e., e-Fuel) that can reduce carbon emissions and replace existing fossil fuels is in the spotlight. The e-Fuel refers to a fuel synthesized by using carbon obtained through various carbon capture technologies and green hydrogen produced by eco-friendly renewable energy. The purpose of this study is to compare and analyze the injection and spray characteristics of the simulated e-Gasoline. We mixed the hydrocarbon fuel components according to the composition ratio of the synthetic fuel produced based on the FT(Fischer-Tropsch) process. As a result of injection rate measurement, simulated e-Gasoline showed no significant difference in injection delay and injection period compared to standard gasoline. However, due to the low vapor pressure of the simulated e-Gasoline, the spray tip penetration (STP) was lower, and the size of spray droplets was larger than that of traditional gasoline.

The Effects of Fabrication Variable on the Characteristics of Simulated Spent Fuel (모의 사용후핵연료의 특성에 미치는 제조변수의 영향)

  • 강권호;류호진;배정현;송기찬;양명승
    • Journal of Energy Engineering
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    • v.10 no.3
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    • pp.278-285
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    • 2001
  • In this study, the effects of the variables on sintering of simulated fuel to simulate the spent fuel are described. Mainly, the effects of compaction pressure, sintering temperature and time on the density of pellet are described. The experimental is performed with compaction pressure of 1 ton/$\textrm{cm}^2$~4 ton/$\textrm{cm}^2$, sintering temperature of 167$0^{\circ}C$, 173$0^{\circ}C$ and 178$0^{\circ}C$ and sintering time of 4 hr, 8 hr and 24 hr. The green density of simulated fuel is proportional to the one third power of compaction pressure and the sintered density is 90.5~99.6% of theoretical density. The grain growth exponent and activation energy of simulated fuel is 2.5 and 287.97 kJ/mol, respectively.

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Slitting Test of Simulated Fuel Rod by Using a Newly Developed Decladding Device (실증용 탈피복 장치를 이용한 모의 핵연료 슬릿팅 시험)

  • Jung, J.H.;Hong, D.H.;Kim, Y.H.;Park, B.S.;Lee, J.K.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.141-144
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    • 2006
  • In this study, we developed a decladding device which separates 250 mm length of simulated nuclear spent fuel rod into the pallets and the pieces of the hulls after inserting the rod cut into the module with several pairs of blades. To improve the performance of the equipment, we considered some mechanisms to prevent the rod cut from being exposed or bounced into the hot-cell, to reduce the operation time, and to insert the rods automatically. It is expected that the newly developed system will contribute to prevent radioactive pollution in the hot-cell, reduce the operation time, and to increase the safety of the operators. As a result of the performance test for some mockup fuel rod cuts in the ACP(Advanced Spent Fuel Control Process) facility, it was verified that the decladding device could be applied to the actual fuel rod cut. And it will be able to use for a scale-up facility in the future.

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A Cumulative Injected Fuel Mass Measurement Under a Vehicle Driven Condition using Loadcells (차량주행 모사 조건에서 로드셀을 이용한 인젝터 누적 연료 분사량 측정)

  • Cho, Seung Keun;Lee, Choong Hoon
    • Journal of ILASS-Korea
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    • v.21 no.1
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    • pp.1-6
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    • 2016
  • A gasoline injector rig which can measure cumulative injected fuel mass under a vehicle driving condition was developed. The measurement system consists of an engine control unit (ECU), data acquisition (DAQ) and injected fuel collection system using loadcells. By supplying reconstructed sensor signals which simulate the real vehicle's sensor signals to the ECU, the ECU drives injectors as if they were driven in the vehicle. The vehicle's performance was computer simulated by using $GT-Suite^{(R)}$ software based on both engine part load performance and automatic transmission shift map. Throttle valve position, engine and vehicle speed, air mass flow rate et al. were computer simulated. The used vehicle driving pattern for the simulation was FTP-75 mode. For reconstructing the real vehicle sensor signals which are correspondent to the $GT-Suite^{(R)}$ simulated vehicle's performance, the DAQ systems were used. The injected fuel was collected with mess cylinders. The collected fuel mass in the mess cylinder with elapsed time after starting FTP-75 driving mode was measured using loadcells. The developed method shows highly improved performance in fast timing and accuracy of the cumulative injected fuel mass measurement under the vehicle driven condition.

A Numerical Study on Gas Mixing Time in a Low-Pressure (Driven) Section of a Shock Tube (충격파관 저압실내 가스 혼합시간 예측에 관한 수치해석)

  • Wang, YuanGang;Cho, Cheon Hyeon;Sohn, Chae Hoon;Yoon, Youngbin
    • Journal of the Korean Society of Combustion
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    • v.22 no.3
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    • pp.23-28
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    • 2017
  • The fuel and oxidizer mixing process in the shock tube driven section is simulated numerically. The boundary condition is set based on an shock tube experimental condition. The objective is to predict the gas mixing time for experiments. In the experiment, the amount of fuel to be injected is determined in advance. Then, according to duration of fuel injection, 5 cases with the same fuel mass but different fuel mass flow rate are simulated. After fuel is injected into the driven section, the fuel and air will be mixed with each other through convection and diffusion processes. The mixing time is predicted numerically for experiments.

Plant morphological symptom caused by simulated acidic rain made by fuel gases (排氣가스로 만든 人工酸性雨에 의한 植物의 形態的 症狀)

  • Chang, Nam-Kee;Yun-Sang Lee;Soo-Jin Yi
    • The Korean Journal of Ecology
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    • v.16 no.1
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    • pp.17-26
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    • 1993
  • We investigated the ph change of water caused by several fuel gases regarded as the main cause of the air pollution, To find out the main cause of increase of the acidity of the rain. We measured it while injrcting each fuel gas directiy to the distilled water. It was observed that bunker-c oil gas and anthracite coal gas were the main cause to make the ph of the solution lowest. We examined the effects of simulated acidic water solutions on several plant species. Simulated acidic rain made by bunker-c oil gas has significant symptom on the saxifraga stolonifera and commelina communis, while no injury was observed on plants exposed to simulated rainfall made by anthracite coal gas.

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