Abstract
One of the lessons learned from the accident at the Fukushima Daiichi Nuclear Power Plant is that an effective accident management system should be equipped on a nuclear reactor to prevent an accident from leading to severe consequences. In which filtered containment venting system (FCVS) is considered an effective system that can enhance the capability to suppress or prevent severe accidents by reducing the pressure, steam water, and flammable gas in containment vessels. The water inventory in a wet-type FCVS plays an important role that affecting the retention efficiency of FCVS. However, a high-level water of the FCVS may affect the performance of the liquid droplet separator due to the high entrainment rate. To overcome this, in this study, perforated metal sheet plates were installed on the upper part of the FCVS to decrease the entrainment rate. The void fraction measurements and entrainment rate estimation were carried out on a large-scale FCVS with and without the perforated plates. It showed that the perforated plates have significant contributions to decreasing the entrainment rate of FCVS, therefore, it allows to expand the water inventory (level) of the scrubber tank.
