An integrated assessment method for a nuclear fuel with high decay heat and high radioactivity is required to establish fast reactor system with Trans-Uranium (TRU) fuel containing minor actinides. In addition, a Pu quantitation method with rapidity and accuracy is also necessary in a viewpoint of nuclear security. For these demands, a quantitative evaluation technique for nuclei concentration, thermal property and physical information of such fuel has to be developed. The present study focuses on the non-destructive imaging using pulsed neutrons. Experiments are carried out at Hokkaido University Neutron Source (HUNS) and a gas electron multiplier (GEM) is applied to obtain 2-D information of time-of-flight (TOF). To simulate a nuclear fuel pellet, a sample with equivalent thermal neutron cross-section to the enriched uranium fuel is prepared and the transmitted images of the simulated sample are acquired. Furthermore, a small piece of In, which simulates the Pu spot in the actual fuel, is inserted into the sample and the detectability of the small spot is discussed.
Ito, D., Sano, T., Hori, J. I., Takahashi, Y., Hasemi, H., Kamiyama, T., & Nakajima, K. (2017). Pulsed Neutron Imaging for Non-destructive Testing using Simulated Nuclear Fuel Samples. In Physics Procedia (Vol. 88, pp. 89–94). Elsevier B.V. https://doi.org/10.1016/j.phpro.2017.06.011