Research on Modeling and Simulation of Nuclear Instrumentation System Based on System Code and Simulink
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摘要: 核测量系统的测量过程具有统计涨落特性，其测量信号是不断变化的。在当前仪控系统仿真分析中，核测量系统模型没有统计涨落特性，难以有效评估核测量系统设计方案的衔接情况和信号波动水平。因此，本文针对核测量系统原理和组成进行研究，设计了核测量系统基础部件仿真模型，构建了精细的核测量系统模型。通过启堆过程的仿真分析，表明核测量系统模型仿真产生的信号与启堆过程吻合良好，3个量程相互之间具有超过1个量级的衔接，全过程周期信号稳定。本文提出的核测量系统建模方法能够模拟核测量系统的统计涨落特性，可用于在仪控系统仿真中更全面地体现核测量系统特性，得到更为真实的工况仿真结果。Abstract: The measurement process of nuclear instrumentation system has statistical fluctuation characteristics, its measurement signal is constantly changing. In the current instrument and control system simulation analysis, the nuclear instrumentation system model has no statistical fluctuation characteristics, so it is difficult to effectively assess the coherence and the signal fluctuation level of nuclear instrumentation system designs. Therefore, this paper studies the principle and composition of nuclear instrumentation system, designs the simulation model of the basic components of nuclear instrumentation system, construts a elaborate model of the nuclear instrumentation system. Through the simulation analysis of the reactor start-up process, it is shown that the signal generated by the simulation of the nuclear instrumentation system is in good agreement with the reactor start-up process, the three ranges are connected to each other by more than one order of magnitude, and the whole cycle signal is stable. The modeling method of nuclear instrumentation system proposed in this paper is able to simulate the statistical fluctuation charateristics of nuclear instrumentation system, and can be used to reflect the characteristics of the nuclear instrumentation system more comprehensively in the simulation of the instrumentation and control system, and obtain more realistic simulation results.
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图 3 电流测量仪表功能逻辑图
Figure 3. Functional Logic Diagram of Current Measuring Instrumentation
图 4 基于Simulink的核测量系统模型
Figure 4. Nuclear Instrumentation System Model Based on Simulink
图 6 启堆过程源量程计数率和中间量程电流对比曲线
Figure 6. Comparison Curve of Source Range Count Rate and Intermediate Range Current During Reactor Starting Process
图 7 启堆过程中间量程电流和功率量程核功率对比曲线
Figure 7. Comparison Curve of Intermediate Range Current and Power Range Nuclear Power During Reactor Starting Process
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