[ASME 16th International Conference on Nuclear Engineering - Orlando, Florida, USA (May 11–15, 2008)] Volume 4: Structural Integrity; Next Generation Systems; Safety and Security; Low Level Waste Management and Decommissioning; Near Term Deployment: Plant Designs, Licensing, Construction, Workforce and Public Acceptance - Analysis of Coupled Neutronic-Thermohydraulic Instabilities in Supercritical Water-Cooled Reactor by Lumped Parameter Modeling