| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9845611 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2005 | 5 Pages |
Abstract
A quantitative void fraction measurement method based on the umbra method using a neutron absorber grid was applied to the void fraction measurement of two-phase flow in a rod bundle. The grid 3Â mm in width and 3Â mm in interval was made from B4C. The two-phase flow direction was vertical and the grid was placed vertically between the rod bundle and the neutron source. A cooled-CCD camera in the JRR-3Â M thermal neutron radiography system was used. CT reconstruction was carried out for 60 horizontal slices with a vertical interval of 3Â mm. Subchannel void fraction distributions were also calculated. The quantitative measurement with spatial resolution 0.1Â mm, size of the image element, horizontally and 3Â mm vertically was carried out.
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Authors
N. Takenaka, H. Asano,