利用人工神经网络技术估计压水堆堆芯轴向和径向功率峰值

A. Saeed, M. Abu Bakr, Ahsan Ullah Saqib
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引用次数: 3

摘要

采用人工神经网络技术(ANNT)对恰希玛核电站1号机组(C-1)堆芯轴向和径向功率峰值因子(Fq, Fah)进行了估计。在神经网络设计中,以T4控制库的位置、四个象限的轴向偏移量和象限的功率倾斜比作为输入变量。利用计算机代码fxs、TWODFD和3D-NB-2P计算了C-1燃料循环期间52个堆芯临界工况下的功率峰值因子(PPF)。通过对每个核心状态的一组测量输入参数和计算输出数据来训练多层感知器(MLP)神经网络。目标与ANNT估计的峰值因子之间的训练平均相对误差在0.018% ~ 0.054%之间,这意味着ANNT在训练过程中引入了可以忽略不计的误差,并且准确地映射了这些值。在验证过程中,使用ANNT估计了在燃料循环过程中进行功率分配测量测试和堆内/堆外探测器校准测试时设计的36个案例的PPF。将核内通量测图系统和INCOPW计算机代码测得的C-1峰值因子进行了比较。结果显示,ANNT估计的PPF与C-1测量值偏差在±3%以内。本研究结果表明,ANNT是一种替代的PPF测量技术,仅使用堆芯外探测器信号数据,独立于堆芯内磁通成像系统。它可以将堆芯通量测绘的间隔时间增加到180个有效满功率日(efpd),并减少先进国家核电厂在燃料循环期间堆芯通量测绘系统的使用频率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimation of Axial and radial in-core power peaking in PWR plant using artificial neural network technique
Axial and radial power peaking factors (Fq, Fah) were estimated in Chashma Nuclear Power Plant Unit-1 (C-1) core using artificial Neural Network Technique (ANNT). Position of T4 control bank, axial offsets in four quadrants and quadrant power tilt ratios were taken as input variables in neural network designing. Power Peaking Factors (PPF) were calculated using computer codes FCXS, TWODFD and 3D-NB-2P for 52 core critical conditions made during C-1 fuel cycle-7. A multilayered Perceptron (MLP) neural network was trained by applying a set of measured input parameters and calculated output data for each core state. Training average relative errors between targets and ANNT estimated peaking factors were ranged from 0.018% to 0.054%, implies that ANNT introduces negligible error during training and exactly map the values. For validation process, PPF were estimated using ANNT for 36 cases devised at the time when power distribution measurement test and in-core/ex-core detectors calibration test were performed during fuel cycle. ANNT Results were compared with C-1 peaking factors measured with in-core flux mapping system and INCOPW computer code. Results showed that ANNT estimated PPF deviated from C-1 measured values within ±3%. The results of this study indicate that ANNT is an alternate technique for PPF measurement using only ex-core detectors signals data and independent of in-core flux mapping system. It might increase the time interval between in-core flux maps to 180 Effective Full Power Days (EFPDs) and reduce usage frequency of in-core flux mapping system during fuel cycle as present in Advanced Countries Nuclear Power Plants.
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