A Comprehensive Study on Rewetting Behavior of Nuclear Fuel Rod Bundles during Loss of Coolant Accident

Rewetting is a process of repeatedly cooling hot surfaces. Rewetting is a very important content with thermal control for the safety of nuclear reactors during Loss of Coolant Accident (LOCA). A comprehensive study has been carried out over emergency core cooling of reactors and flow boiling regimes has also been depicted. Some valuable information drawn from overall achievement from this present investigation is the following the rewetting behavior is more or less linearly dependent on the operating conditions, but much effective response is observed with design parameters. In the present observation, it is very difficult to give a comment on the performance of the rewetting inside the rod bundle, as the flow is irregular and always distorted throughout the flow process in the rod bundle. It gives different information to one another location for each position of the rod bundled. The only valuable information drawn from overall achievement from this present investigation is the following; the rewetting performance can be improved significantly with the jet direction, with the proper jet diameter and certain maintenance on the liquid sub cooling and flow conditions depending on the initial wall temperature. Future works are depicted here which exclude the fundamental accomplishments from the present study.