Nuclear Engineering and Technology

  • 제56권1호
  • /
  • Pages.19-33
  • /
  • 2024
  • /
  • 1738-5733(pISSN)
  • /
  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Development of a one-dimensional system code for the analysis of downward air-water two-phase flow in large vertical pipes

  • Donkoan Hwang (Division of Advanced Nuclear Engineering, POSTECH) ;
  • Soon Ho Kang (Korea Institute of Nuclear Safety (KINS)) ;
  • Nakjun Choi (Division of Advanced Nuclear Engineering, POSTECH) ;
  • HangJin Jo (Division of Advanced Nuclear Engineering, POSTECH)
  • 투고 : 2023.04.03
  • 심사 : 2023.08.13
  • 발행 : 2024.01.25
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초록

In nuclear thermal-hydraulic system codes, most correlations used for vertical pipes, under downward two-phase flow, have been developed considering small pipes or pool systems. This suggests that there could be uncertainties in applying the correlations to accident scenarios involving large vertical pipes owing to the difference in the characteristics of two-phase flows, or flow conditions, between large and small pipes. In this study, we modified the Multi-dimensional Analysis of Reactor Safety KINS Standard (MARS-KS) code using correlations, such as the drift-flux model and two-phase multiplier, developed in a plant-scale air-inflow experiment conducted for a pipe of diameter 600 mm under downward two-phase flow. The results were then analyzed and compared with those based on previous correlations developed for small pipes and pool conditions. The modified code indicated a good estimation performance in two plant-scale experiments with large pipes. For the siphon-breaking experiment, the maximum errors in water flow for modified and original codes were 2.2% and 30.3%, respectively. For the air-inflow accident experiment, the original code could not predict the trend of frictional pressure gradient in two-phase flow as / increased, while the modified MARS-KS code showed a good estimation performance of the gradient with maximum error of 3.5%.

키워드

과제정보

This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government (MOTIE). (20222020800130, Development and demonstration of hybrid power system using ORC (Organic Rankine Cycle) and TEG (Thermoelectric Generator) for low and medium temperature industrial waste heat recovery).

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