Analysis of the Isp-50 Direct Vessel Injection Sbloca in the Atlas Facility With the RELAP5/MOD3.3 Code

Computational fluid dynamics study of pressurized thermal shock phenomena in the reactor pressure vessel

“…At each axial node in the downcomer, all water streams are properly mixed together giving slower variation of temperature compared to CFD results. Also, adoption of cross junction components available in RELAP5 for the downcomer annulus cannot lead to better prediction of the temperature in the downcomer (Sharabi and Freixa, 2012). The dotted lines in the figure indicate the drop in temperature due the SIP injection which starts earlier than the accumulator injection but in CFD simulation, time zero is assumed at the accumulator injection.…”