核電站 (NPP) 的故障將是可怕的。 有必要對核電廠進行針對外部事件的概率安全評估（PSA）。 降水、海浪、海嘯等外部事件可能導致核電廠失效。 有一些裝置用於保護核電廠的組件。 其中一個裝置是防水門。 脆弱性分析是結構/組件失效的條件概率。 它被衡量為在特定條件下容量小於需求的概率。 在本論文中，我們以海嘯為外部事件，對水密門進行易損性分析。 利用近期論文的測試數據，我們開發了一種方法來找到本文提供的三個水密門之間的水密門的脆性曲線，並觀察它們不同的水密性能。 由於數字化誤差、不同的密封部件和不同的可接受洩漏，由此產生的脆性曲線不一定是特定水密門的精確脆性曲線。 在地震概率風險評估中進一步的故障樹分析需要脆弱性曲線。 最後，我們根據偶然不確定性與認知不確定性的比率給出了一個公式，以便通過水密門的平均脆弱性曲線找到高置信度低概率故障 (HCLPF) 容量的下限和上限。

Failure on the nuclear power plants (NPP) will be hideous. It is necessary to conduct probabilistic safety assessment (PSA) of an NPP against external events. External events such as precipitation, waves, tsunami, etc. might cause the failure of NPP. There are some devices used to protect the component of NPP. One of the devices is a watertight door. Fragility analysis is the conditional probability of a structure/component failure. It is measured as a probability of capacity being less than demand on specific conditions. In this thesis, we use fragility analysis on watertight doors with tsunami as the external event. Using test data from recent paper, we develop method to find the fragility curves of watertight doors in between the three watertight doors provided by the paper and observe their different watertight performance. The resulting fragility curves will not necessarily be the exact fragility curves of a specific watertight door due to digitized error, various sealing part, and different acceptable leakage. The fragility curves are required in further fault tree analysis during seismic probabilistic risk assessment. Finally, we give a formula in terms of the ratio of aleatory uncertainty to epistemic uncertainty in order to find the lower and upper bounds of high-confidence low-probability-failure (HCLPF) capacity through the mean fragility curve of watertight doors.

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