Simulation of the Pressure-Tube Circumferential Temperature Distribution Experiments (Variable Make-Up Water Experiments)

Abstract

In the Variable Make-Up Water experiment series, water was injected into the pressure tube at a controlled and declining rate to study the effect of a gradual decrease in make-up water flow rate on the pressure tube circumferential differential temperature. These experiments are designed to simulate the decreasing density driving head as the liquid level in the feeder decreases following a large LOCA scenario. The first experiment of this series is simulated using the SMARTT computer code and the simulation results are compared with the experimental results for code verification. A brief description of the SMARTT code as well as the modifications implemented to improve the code capabilities are also presented.