2011年3月11日發生的東日本大地震，造成福島核電廠裡的各機組相繼爆炸，致使輻射外洩，因此為降低如此重大災害的發生，應加強如核電廠這類較高危險建物的地震安全評估，由於台灣與日本同樣位於環太平洋地震帶，因此台灣核電廠的結構安全亦是一項重大的課題，目前各核電廠皆有裝設可記錄地震反應的監測系統，因此可將量測訊號藉由系統識別技術來求得核電廠的動態特性，但由於量測訊號容易受到雜訊以及環境因素的干擾，如若直接進行識別分析，則會造成嚴重的誤差，故本文根據核電廠的結構特性以及訊號處理的原理，建立一套訊號篩選的標準流程，在識別流程方面，分別以遞迴最小平方法、OKID配合ERA以及頻率響應函數FRF進行識別，將三種方法的識別結果進行比較，排除較大差異的識別結果，並與FSAR的原始設計值及「第三次十年整體安全評估」的報告內容進行平行驗證，最後建立核電廠的結構健康履歷，如結構的自然頻率在經過地震後有明顯的下降，代表核電廠受到明顯的破壞，便可及早的進行耐震補強。

The Earthquake that occurred on March 11, 2011 in Japan ,which caused explosion
and radiation leak in the Fukushima nuclear power plant. Therefore, in order to reduce the occurrence of such a major disaster, Seismic safety assessment of higher-risk structures such as nuclear power plants should be strengthened. Since Taiwan and Japan are also located in the Circum-Pacific seismic belt, the structural safety of Taiwan’s nuclear power plants is also a major issue. At present, the nuclear power plants have monitoring systems that can record seismic reactions, so the measurement signals can be used to obtain the dynamic characteristics of nuclear power plants through system identification technology. However, because the measurement signal is easily interfered by noise and environmental factors, if the identification analysis is directly performed, it will cause serious errors. Therefore, this paper establishes a standard process for signal screening from the structural characteristics of nuclear power plants and the principle of signal processing. In the identification process, the recursive least squares method, OKID with ERA and frequency response function FRF are used for identification. We compare the results to exclude the results of the larger differences,and verify the original design values of FSAR and the report content of the “Third 10-year Overall Safety Assessment Report”. Finally, establish a structural health resume of the nuclear power plant. If the natural frequency of the structure drops significantly after the earthquake, it means that the nuclear power plant is obviously damaged, and the earthquake-resistant reinforcement can be carried out as soon as possible.

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