Nuclear Engineering and Technology

  • 제54권12호
  • /
  • Pages.4759-4775
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  • 2022
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Application of two different similarity laws for the RVACS design

  • Min Ho Lee (Department of Nuclear Engineering Ulsan National Institute of Science and Technology (UNIST)) ;
  • Ji Hwan Hwang (School of Energy Systems Engineering Chung Ang University) ;
  • Ki Hyun Choi (School of Energy Systems Engineering Chung Ang University) ;
  • Dong Wook Jerng (School of Energy Systems Engineering Chung Ang University) ;
  • In Cheol Bang (Department of Nuclear Engineering Ulsan National Institute of Science and Technology (UNIST))
  • 투고 : 2022.05.25
  • 심사 : 2022.07.30
  • 발행 : 2022.12.25
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초록

The RVACS is a versatile and robust safety system driven by two natural circulations: in-vessel coolant and ex-vessel air. To observe interaction between the two natural circulations, SINCRO-IT facility was designed with two different similarity laws simultaneously. Bo' based similarity law was employed for the in-vessel, while Ishii's similarity law for the ex-vessel excluding the radiation. Compared to the prototype, the sodium and air system, SINCRO-IT was designed with Wood's metal and air, having 1:4 of the length reduction, and 1.68:1 of the time scale ratio. For the steady state, RV temperature limit was violated at 0.8% of the decay heat, while the sodium boiling was predicted at 1.3%. It showed good accordance with the system code, TRACE. For an arbitrary re-criticality scenario with RVACS solitary operation, sodium boiling was predicted at 25,100 s after power increase from 1.0 to 2.0%, while the system code showed 30,300. Maximum temperature discrepancy between the experiments and system code was 4.2%. The design and methodology were validated by the system code TRACE in terms of the convection, and simultaneously, the system code was validated against the simulating experiments SINCRO-IT. The validated RVACS model could be imported to further accident analysis.

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과제정보

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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