基于ORIGEN2的西安脉冲堆堆芯核素存量自动跟踪程序

针对反应堆事故源项研究中功率运行史统计繁冗的难题,以西安脉冲堆为对象,建立了脉冲堆功率参数计算数学模型,开发了基于ORIGEN2程序的堆芯核素存量自动跟踪功能示范程序ORBITER,并进行了验证。结果表明,堆芯核素存量跟踪迭代算法技术路径是可行,计算精度可接受。在基准算例66.5 MW·d/tU的燃耗深度下,与ORIGEN2传统算法比较,三个典型核素中⁸⁵Kr偏差最大,其值为2.00%,偏差主要来自于算法对辐照/衰变过程的微分化处理。堆芯核素存量跟踪迭代算法借助计算机自动化技术自动跟踪反应堆功率运行史,实时输出堆芯内核素存量,不仅显著降低了人工统计所需的时间和体力成本,也大幅提高了源项数据获取时效性。

ORIGEN2-based isotope inventory auto-trackingcode for Xi'an Pulsed Reactor

For dealing with the problems like power operation history collection in reactor source term study, an isotope inventory auto-tracking method based upon ORIGEN2 for Xi’an Pulsed Reactor (XAPR) was proposed. The technical measures, such as revision on ORIGEN2 built-in cross sections, creation of interval power-averaging models for XAPR, were detailed in this paper, and a demonstration code, called ORBITER (ORIGEN2-Based Inventory TrackER), was developed to verify the method. By checking out the results of ORBITER with those yielded traditionally by ORIGEN2, it was proved that the method was technically feasible and precisely reliable. For the included benchmark example with 66.5 MW·d/tU burn-up, ⁸⁵Kr among the selected three typical isotopes was found to have the greatest deviation of 2.00%, and the inaccuracy was produced by the differentiating process of calculation case, which contributed to the major deviation. By employing computer automation, the new method could decrease the work load and time consumption dramatically, and increase the source-term data acquiring efficiency remarkably.