Thermal Performance Monitoring and Analysis of Nuclear Power Plant

Jianfei Hou, Xun Zhang, Heino Zimmermann, Zhaohui Xiang
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Abstract

In order to avoid sudden fault and damage of equipment which will affect reliability and safety of the nuclear power plant, it is necessary to monitor the actual thermal performance of the nuclear power plant and analyse the thermal performance trends of thermal circuits and important equipment which is the basis of fault predicts. Based on the mature and widely applied EBSILON software, thermodynamic model of a nuclear power plant in operation is built including the primary loop, second and third loop and important equipment such as steam turbines, condenser, deaerator, low-pressure and high-pressure heaters and main feed water pumps. In particular, hundreds of instruments are taken into account in the thermodynamic model and all the measured data during operation of the nuclear power plant is imported into the instruments. Thermal performance of the nuclear power plant is evaluated and analyzed in different seasons and results displays the performance factors of important equipment compared to the design performance. In addition, a data reconciliation calculation is taken out to check the correctness of measurements using the massive redundant measured data of the plant and results shows some instruments may have potential measurement fault. Current work lays a foundation for the future research of fault predicts and diagnoses of the nuclear power plant.
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核电站热性能监测与分析
为了避免设备的突然故障和损坏,影响核电站的可靠性和安全性,有必要对核电站的实际热性能进行监测,分析热回路和重要设备的热性能趋势,这是故障预测的基础。基于成熟且应用广泛的EBSILON软件,建立了包括一回路、二回路、三回路以及汽轮机、凝汽器、除氧器、低压、高压加热器、主给水泵等重要设备在内的核电厂运行热力学模型。特别是在热力学模型中考虑了数百种仪器,并将核电站运行期间的所有测量数据导入仪器中。对核电站不同季节的热工性能进行了评价和分析,结果显示了重要设备的性能因素与设计性能的对比。此外,利用该装置的大量冗余测量数据进行了数据核对计算,以检查测量的正确性,结果表明某些仪器可能存在潜在的测量故障。本文的工作为今后核电站故障预测与诊断的研究奠定了基础。
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