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Bang, In Cheol
Nuclear Thermal-Hydraulics & Reactor Safety Lab
Research Interests
  • Nuclear Thermal-Hydraulics
  • Nuclear Safety
  • Nuclear System Design & Analysis
  • Nanofluids
  • Critical Heat Flux

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Hybrid heat pipe based passive cooling device for spent nuclear fuel dry storage cask

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Title
Hybrid heat pipe based passive cooling device for spent nuclear fuel dry storage cask
Author
Jeong, Yeong ShinBang, In Cheol
Issue Date
2016-03
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
APPLIED THERMAL ENGINEERING, v.96, pp.277 - 285
Abstract
Conventional dry storage facilities for spent nuclear fuel (SNF) were designed to remove decay heat through the natural convection of air, but this method has limited cooling capacity and a possible re-criticality accident in case of flooding. To enhance the safety and capacity of dry storage cask of SNF, hybrid heat pipe-based passive cooling device was suggested. Heat pipe is an excellent passive heat transfer device using the principles of both conduction and phase change of the working fluid. The heat pipe containing neutron absorber material, the so-called hybrid heat pipe, is expected to prevent the re-criticality accidents of SNF and to increase the safety margin during interim and long term storage period. Moreover, a hybrid heat pipe with thermoelectric module, a Stirling engine and a phase change material tank can be used for utilization of the waste heat as heat-transfer medium. Located at the guide tube or instrumentation tube, hybrid heat pipe can remove decay heat from inside the sealed metal cask to outside, decreasing fuel rod temperature. In this paper, a 2-step analysis was performed using computational fluid dynamics code to evaluate the heat and fluid flow inside a cask, which consisted of a single spent fuel assembly simulation and a full-scope dry cask simulation. For a normal dry storage cask, the maximum fuel temperature is 290.0 °C. With hybrid heat pipe cooling, the temperature decreased to 261.6 °C with application of one hybrid heat pipe per assembly, and to 195.1 °C with the application of five hybrid heat pipes per assembly. Therefore, a dry storage cask with hybrid heat pipes produces relatively low temperature inside a cask and reduces the possibility of structural failure due to thermal degradation.
URI
https://scholarworks.unist.ac.kr/handle/201301/18009
URL
http://www.sciencedirect.com/science/article/pii/S1359431115013320
DOI
10.1016/j.applthermaleng.2015.11.086
ISSN
1359-4311
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