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Research on detection technology of 235U enrichment and loading uniformity for nuclear fuel rods
Frontiers in Energy Research ( IF 3.4 ) Pub Date : 2021-06-29 , DOI: 10.3389/fenrg.2021.663937
Mingfei Gu , Dagui Huang , Dongbao Yu , Hui Tang , Yongli Zhu

Abstract: To ensure that fuel rods operate in nuclear reactors safely and reliably, UO2 pellets with different enrichment levels of 235U in same production line are manufactured in batches and divisionally managed. It is prohibited to confuse and misload UO2 pellets with different enrichment levels. At same time, nondestructive test for their enrichment levels and loading uniformity and all UO2 pellets must be nondestructive tested during production. By studying enrichment detection mechanism of UO2 pellets of 235U, the design of integral standard rod was carried out, and single integral standard rod was used to achieve the calibration of enrichment measurement curve, as well as the detection and calibration of abnormal pellets. The comparison test of 235U enrichment between neutron activation method and array multi-probe passive method was carried out in this paper. The test results showed that array multi-probe passive method had higher detection efficiency and equal accuracy.

中文翻译:

核燃料棒235U浓缩及装填均匀性检测技术研究

摘要:为确保核反应堆燃料棒安全可靠运行,在同一生产线上分批生产235U不同浓缩度的UO2芯块,分批生产。禁止混淆和误装不同富集度的 UO2 颗粒。同时,对它们的富集水平和装载均匀性进行无损检测,所有UO2球团在生产过程中都必须进行无损检测。通过研究235U的UO2弹丸富集检测机理,进行了积分标准棒的设计,利用单个积分标准棒实现了富集测量曲线的校准,以及异常弹丸的检测校准。本文对中子活化法与阵列多探针无源法进行了235U富集对比试验。测试结果表明,阵列多探头无源法具有更高的检测效率和同等准确度。
更新日期:2021-06-29
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