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http://dx.doi.org/10.3795/KSME-B.2007.31.5.482

1-D Two-phase Flow Investigation for External Reactor Vessel Cooling  

Kim, Jae-Cheol (제주대학교 에너지공학과)
Park, Rae-Joon (한국원자력연구원 열수력안전연구센터)
Cho, Young-Rho (한국원자력연구원 열수력안전연구센터)
Kim, Sang-Baik (한국원자력연구원 열수력안전연구센터)
Kim, Sin (제주대학교 에너지공학과)
Ha, Kwang-Soon (한국원자력연구원 열수력안전연구센터)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.31, no.5, 2007 , pp. 482-490 More about this Journal
Abstract
When a molten corium is relocated in a lower head of a reactor vessel, the ERVC (External Reactor Vessel Cooling) system is actuated as coolant is supplied into a reactor cavity to remove a decay heat from the molten corium during a severe accident. To achieve this severe accident mitigation strategy, the two-phase natural circulation flow in the annular gap between the external reactor vessel and the insulation should be formed sufficiently by designing the coolant inlet/outlet area and gap size adequately on the insulation device. For this reason, one-dimensional natural circulation flow tests and the simple analysis were conducted to estimate the natural circulation flow under the ERVC condition of APR1400. The experimental facility is one-dimensional and scaled down as the half height and 1/238 channel area of the APR1400 reactor vessel. The calculated circulation flow rate was similar to experimental ones within about ${\pm}$15% error bounds and depended on the form loss due to the inlet/outlet area.
Keywords
Natural Circulation Flow; External Reactor Vessel Cooling; Two-Phase Flow;
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