Fluid-structure interaction during LOCA blowdown

A methodology for realistically analyzing three-dimensional fluid-structure interaction effects and the resulting hydrodynamic loads during the subcooled portion of a hypothetical loss-of-coolant accident in a pressurized water reactor is discussed. The methodology uses a hydrodynamic computer program, STEALTH 3D coupled with a structural response program, WHAMSE 3D, to calculate the dynamic interaction of fluid and structure during a reactor vessel blowdown. This coupled program is user oriented and highly versatile in modeling the various components in complex reactor systems. Assessment of the methodology is provided by STEALTH/WHAMSE 3D calculations of blowdown tests in the German Battelle-Frankfurt RS-16B facility (Test DWR5) and the HDR facility (Tests V31.1 and V32). The calculations are described and the results compared with experimental data. Agreement between the calculational results and experimental data is good