Application of two different similarity laws for the RVACS designopen access
- Authors
- Lee, M.H.; Hwang, J.H.; Choi, K.H.; Jerng, D.W.; Bang, I.C.
- Issue Date
- Dec-2022
- Publisher
- Korean Nuclear Society
- Keywords
- Liquid metal; Natural circulation; Passive safety; RVACS; SFR; Similarity law
- Citation
- Nuclear Engineering and Technology, v.54, no.12, pp 4759 - 4775
- Pages
- 17
- Journal Title
- Nuclear Engineering and Technology
- Volume
- 54
- Number
- 12
- Start Page
- 4759
- End Page
- 4775
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/75371
- DOI
- 10.1016/j.net.2022.07.023
- ISSN
- 1738-5733
2234-358X
- 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. © 2022 Korean Nuclear Society
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