Multidimensional Analysis of Fluid Flow in the Loft Cold Leg Blowdown Pipe during a Loss-of-Coolant Experiment,

摘要

A computer analysis of fluid flow in the Loss-of Fluid Test (LOFT) cold leg blowdown pipe during a loss-of-coolant experiment (LOCE) was performed using the computer program K-FIX/MOD1. The purpose of this analysis was to evaluate the capability of K-FIX/MOD1to calculate theoretical fluid quantity distributions in the blowdown pipe during a LOCE for possible application to the analysis of LOFT experimental data,the determination of mass flow,or the development of data reduction models. A rectangular section of a portion of the LOFT blowdown pipe containing measurement Station BL-1was modeled using time-dependent boundary conditions. Fluid quantities were calculated during a simulation of the first 26 s of LOFT LOCE L1-4. Sensitivity studies were made to determine changes in void fractions and velocities resulting from specific changes in the inflow boundary conditions used for this simulation.