| 摘要 |
PROBLEM TO BE SOLVED: To detect the presence of smaller lumps of neutron poison when the homogeneity of the neutron poison dispersed in fuel is inspected.SOLUTION: A neutron poison homogeneity inspection apparatus which inspects the homogeneity of neutron poison in a fuel 5 to be inspected that contains neutron poison includes a neutron irradiator, a neutron radiographic image capturing unit 6 and an image determiner 7. The neutron irradiator includes a neutron source 2, a moderator 1 and a collimator 4. The neutron radiographic image capturing unit 6 captures a neutron radiographic image in the fuel to be inspected that is irradiated with neutrons by the neutron irradiator. The image determiner 7 determines the presence of lumps of neutron poison of a prescribed size or larger on the basis of the dispersion in the luminance of the neutron radiographic image captured by the neutron radiographic image capturing unit 6, for example, whether the difference in the local luminance to an approximate curve of the luminance of the neutron radiographic image is larger than a certain threshold. |
