Best Estimate Power Method Based on Vanadium SPND Prompt Response Currents
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摘要: 三代压水堆堆芯运行中根据自给能中子探测器（SPND）响应电流快速获得总功率，称之为最佳指示功率估计。现有技术基于钒SPND的总电流与总功率间的线性关系假设（称之为总电流估计法），因无法区分不同电流组分的时间响应，而无法适用于瞬态运行过程。为了提升对运行过程的监测能力，基于压水堆堆芯分析软件NECP-Bamboo中的SPND响应电流计算功能，提出了基于钒SPND瞬发电流的最佳指示功率估计方法（称之为瞬发电流估计法），同时用于瞬态和稳态运行过程，并与已有方法进行了定量对比分析。数值结果表明：①在稳态运行过程中，总电流估计法和瞬发电流估计法给出的最佳指示功率偏差均小于1%额定功率；②在堆芯快速降功率（RPR）棒组落棒的瞬态过程中，总电流估计法的偏差大于50%，而瞬发电流估计法的偏差小于1%。
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关键词:
- 自给能中子探测器（SPND） /
- 瞬发电流 /
- NECP-Bamboo /
- 堆芯最佳功率估计
Abstract: During operation of the third-generation pressurized water reactor (PWR), the total power can be rapidly estimated based on the response current of the Self-Powered Neutron Detector (SPND). It can be referred to as the best estimate power method. Existing techniques rely on the assumption of a linear relationship between the total SPND current of Vanadium SPND and the total power (referred to as the total current estimation method), which cannot differentiate the time response of different current components. Thus, it is not suitable for transient operating conditions. To enhance the monitoring capability during operation, a novel estimation method based on the prompt current of Vanadium SPND is proposed, utilizing the SPND response current calculation feature in the NECP-Bamboo PWR core analysis software. This method can be applicable for both steady and transient operating process. The method is quantitatively compared with existing methods. Numerical results demonstrate that: 1) the deviations of the total current estimation method and the prompt current estimation method are both less than 1% of rated full power during the steady operation; 2) the deviation of the total current estimation method exceeds 50%, while the deviation of the prompt current estimation method is less than 1% during the Rapid Power Reduction (RPR) bank insertion process. -
图 1 钒SPND响应电流产生途径
Figure 1. The Mechanism of Vanadium SPND Response Current Generation
图 3 稳态堆芯最佳指示功率线性关系对比
Figure 3. Comparison of Best Power Estimate Linear Equation for Steady-state Core
图 5 RPR棒组选择[18]
AP1000堆芯共有69组控制棒组，包含6组M棒组（M1、M2、MA、MB、MC、MD）、4组停堆棒组（S1~S4）和1组AO棒
Figure 5. Selected RPR Banks
图 6 RPR落棒瞬态过程中相对功率变化
Figure 6. Relative Power Variation during RPR Rod Insertion Transient Process
图 7 RPR落棒瞬态过程中响应电流变化
Figure 7. Response Current Variation during RPR Rod Insertion Transient Process
图 8 基于总响应电流的最佳指示功率估计值及偏差
Figure 8. Error of the Best Estimate Power Based on Total Response Current
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