Harmonics Expansion Method for On-line Monitoring of PWR Power Distribution
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摘要: 压水堆堆芯的功率分布可由中子扩散方程的高阶谐波线性展开,结合中子探测器的读数,可实现反应堆堆芯功率分布的实时监测。监测精度由探测器的精度以及参考堆芯与反应堆真实状态的相似度共同决定。由于反应堆运行状态具有复杂性和多样性,本文提出通过模拟反应堆的各种运行状态,并计算其高阶谐波,建立具有代表性的反应堆状态谐波数据库,对反应堆的功率进行在线监测的方法。应用大亚湾核电站1号机组的测量数据对该方法的监测精度进行验证的结果表明,监测误差均在±3%以内,满足工程要求。Abstract: The power distribution of PWRs can be expended by harmonics.Combined with the detector readings,the harmonics can be used to reconstruct the reactor power distribution on-line with high speed.The accuracy of reconstruction is related to the precision of neutron detectors and the similarity of the reference case to the real one.But it is difficult to choose the reference case because the condition of the reactor is much complex.In this paper,some simulations of the reactor are done to generate a data library of harmonics for on-line monitoring of the PWR power distribution.Measurement from DAYABAY nuclear power station is used to verify the accuracy of this method.The result shows that the relative errors between the measurement and the reconstruction result is less than 3%,which satisfies the requirement of engineering.
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Key words:
- Harmonics /
- Data Library /
- Diffusion /
- On-line monitoring
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