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http://dx.doi.org/10.1016/j.net.2022.07.023

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))
Publication Information
Nuclear Engineering and Technology / v.54, no.12, 2022 , pp. 4759-4775 More about this Journal
Abstract
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.
Keywords
RVACS; SFR; Passive safety; Natural circulation; Liquid metal; Similarity law;
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Times Cited By KSCI : 3  (Citation Analysis)
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