沸水式反應器是藉由中子碰撞核燃料使其發生核分裂產生巨大的能量，產生出的熱量會使冷卻水在反應器中發生沸騰的現象，其在高功率低流量的情形之下會結合了中子與熱流效應而造成功率與流量的震盪所引起的不穩定效應。而我國有三種不同類型的的BWRs，分別為BWR/4(核一廠)、BWR/6(核二廠)和ABWR(龍門電廠)，所以建立一個本土化的穩定性方法論的很重要的。此研究使用LAPUR5.2方法論去分析了核一廠、核二廠和龍門電廠在相同的功率/流量點之上，它們之間同相衰減率和異相衰減率的相比較。然後對於會影響爐心穩定性的參數去做分析研究，看看那些參數在不同型式BWRs之相同的功率/流量點時的差異，並且去分析為何會造成不同型式BWRs在功率/流量點之下會有不同的衰減率。也計算、建立了核一、二廠衰減率為0.8的穩定性運轉邊界，藉由以上的分析可以知道哪種類型的BWRs在穩定性方面較優異。

In a boiling water reactor (BWRs), when neutrons collide nuclear fuel, huge energy is generated by nuclear fission in the reactor core, and the heat it produced causes the cooling water to boil, producing steam. That it combines the neutron and thermal effects under high power /low-flow causes the instability resulted from oscillation of power and flow.
In Taiwan, there are three different types of BWRs, one is BWR / 4 (Chinshan Nuclear Power Plant), another is BWR / 6 (Kuosheng Nuclear Power Plant) and the other is ABWR (Lungmen Nuclear Power Plant). Therefore, building a localized stability methodology is crucial.
LAPUR5.2 methodology is employed in this study to compare the global and regional mode decay rate at the same power / flow points between Chinshan, Kuosheng and Lungmen Nuclear Power Plant. By comparing the parameters that concerns stability of core, we can observe and analyze why different decay rates are generated between different types of BWRs at the same power/flow points. Furthermore, the stability operating boundary of Chinshan and Kuoshen NPP with 0.8 decay ratio also have been built and calculated. According to above analysis, we can figure out which type of BWRs will perform better in stability.

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