Experimental study on mixing phenomenon inside reactor down-comer under single-loop injection using laser induced fluorescence

The boron dilution transient may cause re-criticality during an emergency shutdown, and the mixing between de-borated slug and boric acid inside the annular down-comer and the lower plenum is the inherent mechanism against such accident. A visualization pressure vessel model was built to study the mixing phenomenon and analyze the mixing mechanism, the injection coolant with boric acid is represented by dye-sucrose solution, and the dye...