REWET-I facility

The main objectives of REWET-I facility was to investigate the effect of different parameters on rewetting process and to derive values for the heat transfer coefficient from the rod surface to the coolant. The effect of nitrogen dissolved in the coolant was studied, too. 227 experiments were carried out with the facility. Now facility is used only for demonstrations and student works.

The test section in REWET-I consisted of a directly heated fuel rod simulator (total length 2135 mm, heated length 1550 mm, outer diameter 12.25 mm) surrounded by a quartz glass tube (inner diameter 24.2 mm, thickness of the glass wall 3 mm). Now there are three rods in the core. Due to the glass tube surrounding the rod, the rewetting phenomena can be visualized. The cooling water flows in the annular flow channel between rod and glass.

The facility contains five cladding temperature measurements and one temperature measurement of the injected coolant. The pressure of the test section is measured in one place. The coolant flow is measured by a rotameter.

At the beginning of the experiments the fuel rod simulators are heated until the cladding temperature is high enough. Then the injection of the coolant into the test section is started.

© Copyright LUT University