Experimental and numerical analysis of thermal stratification in large water pool

In the present studies, thermal stratification into the large pool has been studied. The modeling of thermal stratification has been done using RELAP5 and result has been validated with the help of experiments performed in ITL. Comparison of simulation with stratification shows a complete disagreement in prediction. The main issues are 3D natural convective phenomena, which lead to unwanted stratification. Pool modelled as a single pipe in RELAP simulations cannot take care of 3-D effects in pool and produce wrong results. Even the rate of increase of temperature, at different elevations is found diverged compared to experimental results. As a correction to the present model, pool should be modelled in such a way that expansion of the water into tank takes place. This will also allow the hot water to pile over the colder one