Development of a liquid scintillator-based active interrogation system for LEU fuel assemblies
Development of a liquid scintillator-based active interrogation system for LEU fuel assemblies
复制标题
开发用于低浓铀燃料组件的基于液体闪烁体的主动询问系统
DOI：
10.1109/animma.2013.6728037
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
P. Peerani
中科院分区：
文献类型：
--
作者：
A. Lavietes;R. Plenteda;N. Mascarenhas;L. M. Cronholm;M. Aspinall;M. Joyce;A. Tomanin;P. Peerani
原子能机构与联合研究中心（意大利伊斯普拉）和混合仪器公司（英国兰开斯特）合作，开发了一种全尺寸、基于液体蒸发器的主动询问系统，以确定新燃料组件中的铀质量。该系统实现了一个中等体积（~ 1000 ml）的液体闪烁体探测器阵列，多通道脉冲形状鉴别（PSD）系统，以及高速数据采集和信号处理系统，以评估新鲜燃料组件的铀含量。已经进行了广泛的MCNPX-PoliMi建模，以完善系统设计并优化检测器性能。这些测量传统上用基于3 He的测定系统（例如，铀中子符合环[UNCL]、主动井符合环[AWCC]）现在可以在采集时间的一小部分内以更高的精度执行。该系统使用高闪点、无危害的稀释液（EJ 309），使其能够在商业核设施中使用，并通过极短的选通时间、可调能量检测阈值、实时PSD电子器件和基于FPGA的高速数据采集相结合，实现了显著增强的性能和功能。考虑到可能的应用，这项技术也是替代选择3 He为基础的系统的一个很好的候选人。现有的3 He为基础的主动询问系统的比较，在可能的情况下，提供一个基线性能参考。本文将介绍实验室实验和相关的建模活动进行开发和初步测试的原型检测系统。
The IAEA, in collaboration with the Joint Research Center (Ispra, IT) and Hybrid Instruments (Lancaster, UK), has developed a full scale, liquid scintillator-based active interrogation system to determine uranium (U) mass in fresh fuel assemblies. The system implements an array of moderate volume (~1000ml) liquid scintillator detectors, a multichannel pulse shape discrimination (PSD) system, and a high-speed data acquisition and signal processing system to assess the U content of fresh fuel assemblies. Extensive MCNPX-PoliMi modelling has been carried out to refine the system design and optimize the detector performance. These measurements, traditionally performed with 3He-based assay systems (e.g., Uranium Neutron Coincidence Collar [UNCL], Active Well Coincidence Collar [AWCC]), can now be performed with higher precision in a fraction of the acquisition time. The system uses a high-flashpoint, non-hazardous scintillating fluid (EJ309) enabling their use in commercial nuclear facilities and achieves significantly enhanced performance and capabilities through the combination of extremely short gate times, adjustable energy detection threshold, real-time PSD electronics, and high-speed, FPGA-based data acquisition. Given the possible applications, this technology is also an excellent candidate for the replacement of select 3He-based systems. Comparisons to existing 3He-based active interrogation systems are presented where possible to provide a baseline performance reference. This paper will describe the laboratory experiments and associated modelling activities undertaken to develop and initially test the prototype detection system.