Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Effects of decay heat and cooling condition on the reactor pool natural circulation under RVACS operation in a water 2-D slab model

  • Min Ho Lee (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Dong Wook Jerng (School of Energy Systems Engineering, Chung Ang Univ. ) ;
  • In Cheol Bang (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST))
  • Received : 2022.08.10
  • Accepted : 2023.01.24
  • Published : 2023.05.25
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Abstract

The temperature distribution of the reactor pool under natural circulation induced by the RVACS operation was experimentally studied. According to the Bo' based similarity law, which could reproduce the temperature distribution of the working fluid under natural circulation, SINCRO-2D facility was designed based on the PGSFR. It was reduced to 1 : 25 in length scale, having water as a simulant of the sodium, which is the original working fluid. In general, temperature was stratified, however, effect of the natural circulation flow could be observed by the entrainment of the stratified temperature. Relative cooling contribution of the upper plenum (narrow gap) and lower plenum was approximately 0.2 and 0.8, respectively. In the range of decay heat from 0.2% to 1.0%, only the magnitude of the temperature was changed, while the normalized temperature maintained. Boundary temperature distribution change made a global temperature offset of the pool, without a significant local change. Therefore, the decay heat and cooling boundary condition had no significant effect on temperature distribution characteristics of the pool within the given range of the decay heat and boundary temperature distribution.

Keywords

Acknowledgement

This work was supported by the Basic Science Research Program (NRF- 2020M2A8A4022882, 2021M2D2A1A03048950) through the National Research Foundation of Korea (NRF) funded by the Korea government, the Ministry of Science and ICT (MSIT).

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