Calibration and Verification of AFD Used for PWR Nuclear Power Plant Control System with the Mechanical Shim
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摘要: 压水堆核电厂机械补偿控制策略的棒阴影效应导致保护系统指示的轴向通量偏差（AFD）变为外围组件加权值而非堆芯平均值，因此基于堆芯平均AFD的控制系统无法像传统电站那样直接使用保护系统输出值。基于该问题，探索了控制系统堆芯平均AFD几种线性的指示途径，研究了不同控制棒位置及机组氙震荡瞬态对线性关系的影响，提出了一种“偏差修正”的堆芯平均AFD校准方法。经过机组调峰过程验证，结果表明使用该方法可以消除控制棒位置、机组功率变化及氙浓度变化对控制系统AFD指示的影响，能够满足系统指示精度的要求。因此这种方法可以用于机械补偿控制策略控制系统AFD的校准。Abstract: The rod shadow effect of the mechanical shim of PWR nuclear power plant causes the axial flux deviation (AFD) indicated by the protection system to become the weighted value of peripheral components rather than the average value of the core. Therefore, the control system based on the average AFD of the core cannot directly use the output value of the protection system like the traditional power plant. Based on this problem, several linear indication ways of core average AFD of control system are explored, the effects of different control rod positions and xenon oscillation transient on linear relationship are studied, and a core average AFD calibration method with “deviation correction” is proposed. Through the verification of the unit peak shaving process, the results show that the method can eliminate the influence of the control rod position, the unit power change and the xenon concentration change on the AFD indication of the control system, and can meet the requirements of the system indication accuracy. Therefore, this method can be used for the calibration of the mechanical shim control system AFD.
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Key words:
- Mechanical shim /
- Axial flux deviation /
- Peripheral weight
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图 1 AP1000机组堆内钒探测器轴向布置及等效探测器示意图
Figure 1. Axial Layout of AP1000 Unit In-pile Vanadium Detector and the Schematic Diagram of Equivalent Detector
图 2 不同控制棒位置下外围权重AFD与堆芯平均AFD的关系
Figure 2. Relationship between the Peripheral Weight AFD and the Core Average AFD under Different Rod Positions
图 3 Xe震荡过程中外围权重AFD与堆芯平均AFD的关系
Figure 3. Relationship between the Peripheral Weight AFD and the Core Average AFD during Xe Oscillation Process
图 4 不同控制棒位置下堆内探测器AFD与堆芯平均AFD的关系
Figure 4. Relationship between the In-pile Detector AFD and the Core Average AFD under Different Rod Positions
图 5 Xe震荡过程中堆内探测器AFD与堆芯平均AFD的关系
Figure 5. Relationship between In-pile Detector AFD and Core Average AFD during Xe Oscillation Process
图 6 机械补偿策略下保护及控制系统AFD设计流程
Figure 6. Design Flow Chart of the Protection and Control System AFD for the Mechanical Shim Design
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[1] 徐智,蒋道清,徐火根. MSHIM机制下轴向偏移控制的设计改进[J]. 自动化与仪器仪表,2016, 195(1): 124-126. [2] 施建锋,高明敏,杨庆湘. 机械补偿运行对AP1000核电机组的流体温度分层及堆外探测器阴影效应分析[J]. 核动力工程,2018, 39(S2): 77-81. [3] 徐智. 基于钒探测器补偿的轴向偏移控制设计[J]. 原子能科学技术,2016, 50(3): 524-530. doi: 10.7538/yzk.2016.50.03.0524 -
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