Effect of Drywell Gas Recirculation System activation on the Passive Containment Cooling System Response
Passive Containment Cooling Systems (PCCS) are characterizing the design of several advanced LWR such as SBWR, ESBWR, ABWR-II, etc. These systems should ensure the mitigation of postulated accidents both under Design Basic Accident (DBA) and Beyond DBA (BDBA) conditions. Some ALWR designs integrated in the PCCS a system called Drywell Gas Recirculation System (DGRS). The DGRS works like a fan, with inlet flow lines connected to the Passive Cooling condenser (PCC) vent lines and the outflow line connected to the Drywell (DW). The present paper presents the experimental results of an integral containment test performed in the PANDA facility. The initial conditions (temperature, pressure, gas composition, decay heat, etc.) for the test represent the containment situation one hour after a Loss of Coolant Accident (LOCA). The test consists of two phases (6 hour each) for a total duration of about 12 hours. In the first phase has been simulated the response of the PCCS to a LOCA, in the second phase the DGRS has been activated and has been investigated the effect of such activation on the overall PCCS response. The test shows that the activation of the DGRS has an effect on the overall PCCS characteristics, I.e. Composition of gas mixture in the PCC tubes, stratification in the Wetwell (WW), DW-WW pressure differences, timing for the opening of the Vacuum Breakers (VB) and overall containment pressure.
ALWR DGRS ESBWR PANDA PCCS.
Domenico Paladino J(o）rg Dreier
Laboratory for Thermal Hydraulics Nuclear Energy and Safety Department Paul Scherrer Institute, CH-5232 Villigen PSI
国际会议
上海
英文
2118-2129
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）