本研究主要探討沸水式反應器在功率提升狀態下的穩定性分析。核能電廠功率提升大致分為三種層級：MUR（Measurement Uncertainty Recapture）；SPU（Stretch Power Uprate）以及EPU（Extended Power Uprate）。在此參考國外成功提升功率的電廠所提出的報告內容，而本文就其中的穩定性問題部份加以探討，其中包括功率提升後的爐心狀態以及進入不穩定區時所應採取的防護措施。在本論文中我們根據核二廠一號機以及核一廠二號機的爐心資料，利用LAPUR5.2分析工具去分析計算出核二廠一號機以及核一廠二號機功率提升後的四個運轉點。並藉由分析後所得到的結果，綜合國外電廠提升功率的經驗，評估我國電廠小幅度提升功率所可能遭遇的穩定性問題。
由分析後的結果知道，小幅度的提升功率，衰減比率皆不會超過0.8，甚至低於0.8甚多，因此我們知道，小幅度的提升功率並不會對穩定性造成影響。

For a nuclear power plant (NPP), there are three power uprate levels: Measurement Uncertainty Recapture (MUR), Stretch Power Uprat (SPU), and Extended Power Uprate (EPU). The purpose of this study is to analyze the stability of a light water reactor which is under power uprate condition (MUR).

In this study, we are focusing on the stability issue such as monitoring the status of a power uprated core and the precautions against the operation point entering the unstable region, etc. The computer code --- LAPUR5.2 is chosen as the tool for calculation. Based on the data from KuoSheng (Unit I) and ChinShan (Unit II) nuclear power plants, four operation points are calculated by LAPUR5.2 for assumed power uprate tasks. These simulation results are compared with the results from other U.S. NPPs which have successful experience in power uprate. Some stability problems which may take place in Taiwan’s NPP during the power uprate tasks are discussed in this study.

The research results show that a limited power uprate (MUR), usually within 2% of the core power level, will not make the decay ratio exceed 0.8. In many simulation cases the decay ratio is much less than 0.8. Therefore, it is certain that MUR can hardly affect the stability of a nuclear power plant.

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