Abstract
New 3D void fraction measurement system has been developed using neutron radiography technique. The purpose of this development is to measure the void fraction in tight lattice bundles which simulates the Reduced-Moderation Water Reactor (RMWR) core. In this paper, data flow in the image processing and the air-water two-phase flow experiments are mainly described. Especially, we focused on an algorism of a γ-ray noise reduction in the chapter of an image processing. It was confirmed that the γ-ray noise on original images can clearly be reduced by the new noise reduction algorism. Next, measured 3D void fraction was displayed. It was found from the observation of the data that water tends to remain between the rods.
