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To ensure that fuel rods operate in nuclear reactors safely and reliably, UO 2  pellets with different enrichment levels of  235 U in the same production line are manufactured in batches and divisionally managed to avoid confusion or the potential misloading of UO 2  pellets with different enrichment levels. At the same time, nondestructive tests for their enrichment levels and loading uniformity and all UO 2  pellets must be nondestructively tested during production. By studying the enrichment detection mechanism of the UO 2  pellets of  235 U, the design of an integral standard rod was carried out, and a single integral standard rod was used to achieve the calibration of the enrichment measurement curve, as well as the detection and calibration of abnormal pellets. This study undertook a comparison test of  235 U enrichment between the neutron activation method and the array multi-probe passive method. The test results showed that the array multi-probe passive method had higher detection efficiency and equal accuracy.

Research on Detection Technology of 235U Enrichment and Loading Uniformity for Nuclear Fuel Rods