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http://dx.doi.org/10.5855/ENERGY.2019.28.4.103

Numerical Study on Two-phase Natural Circulation Flow by External Reactor Vessel Cooling of iPOWER  

Park, Yeon-Ha (Department of Nuclear and Energy Engineering, Jeju National University)
Hwang, Do Hyun (Central Research Institute, Korea Hydro & Nuclear Power (KHNP))
Lee, Yeon-Gun (Department of Nuclear and Energy Engineering, Jeju National University)
Publication Information
Journal of Energy Engineering / v.28, no.4, 2019 , pp. 103-110 More about this Journal
Abstract
The domestic innovative power reactor named iPOWER will employ the passive molten corium cooling system(PMCCS) to cool down and stabilize the core melt in the severe accident. The final design concept of the PMCCS is yet to be determined, but the in-vessel retention through external reactor vessel cooling has been also considered as a viable strategy to cope with the severe accident. In this study, the two-phase natural circulation flow established between the reactor vessel and the insulation was simulated using a thermal-hydraulic system code, MARS-KS. The flow path of cooling water was modeled with one-dimensional nodes, and the boundary condition of the heat load from the molten core was defined to estimate the naturally-driven flow rate. The evolution of major thermal-hydraulic parameters were also evaluated, including the temperature and the level of cooling water, the void fraction around the lower head of the reactor vessel, and the heat transfer mode on its external surface.
Keywords
severe accident; passive molten corium cooling system; external reactor vessel cooling; two-phase natural circulation; MARS-KS code;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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