.... A parametric study is also carried out with different in-containment break sizes to determine code results' sensitive nature due to natural circulation flow phenomena, which are highly unstable. The analysis shows that the code has produced reasonably accurate results under the tested system thermal-hydraulic...

... decay heat during accident conditions. The nonrotating blower blades may represent a huge pressure loss in the decay heat removal loop (DHR), which hinders natural circulation. The lower the pressure loss coefficient of the DHR blower blades is, the better cooling is available during natural circulation...