ASFRE: A Computer Code for Single-Phase Subchannel Thermal Hydraulic Analysis of LMFBR Single Subassembly

摘要

The objectives of this work is to develop a computer code ASFRE which analyzes 3D-thermo-hydraulic behaviors of coolant and fuel pins in an LMFBR subassembly under accident conditions such as the local blockage, loss of flow and transient over power accident conditions. Analytical models, calculation procedures and sample calculations for typical experiments are described. The ASFRE code consists of two parts, namely coolant calculation part and fuel pin calculation. The coolant thermal-hydraulic analysis employs basically subchannel analysis approach and the program solves transient mass, momentum and energy conservation equations. The fuel pin thermal analysis program solves transient heat conduction equations by finite difference method in cylindrical coordinate system. Fuel temperature distribution and thermal expansion are calculated taking into account of intra/inter-pin-flux-depression and fuel restructuring. And wire wrap spacer effects for coolant behavior and heat loss through the wrapper tube are also simulated. (Atomindex citation 14:725501)