Visualization of Bundle Refuelling Impact Tests at AECL

Abstract

Refuelling impact tests were performed in a flow visualization rig at Atomic Energy of Canada Limited (AECL) using an acrylic flow tube and simulated CANDU channel components, under ambient temperature and pressure conditions with 37-element bundles. An acrylic tube was used as the inlet end of the PT, which facilitated the visualization and high-speed video recording of the impacting bundle movements.



This paper presents the results from the above investigative tests, giving the trends in the impact velocities, impact loads, and bundle condition for different coolant flow rates. The 'impact velocity' versus travel distance trends are compared to previous work.