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首页> 外文期刊>Transactions of the American nuclear society >New Ring Type Burnable Absorber for PWRs
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New Ring Type Burnable Absorber for PWRs

机译：用于压水堆的新型环形可燃吸收剂

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There have been lots of studies to improve the core performance of commercial Pressurized Water Reactors (PWRs)focusing on the design of nuclear fuel assemblies for increase of reactor core cycle length and improvement of safety margin. The burnable absorbers (BAs) were introduced for two reasons: 1) control of excess reactivity, and 2) flattening power distribution. An advanced PWR core design requires a sufficient amount of initial excess reactivity at the beginning of cycle (BOC) for a long cycle operation and low residual absorber penalty at the end of cycle (EOC) to maximize the cycle length. The BA needs to be more efficient in terms of smaller amount for the same reactivity holddown effect and flat burning rates to minimize reactivity swing. Considering the above requirements, single isotope based B A is selected for the new design of hybrid burnable absorber. Since natural elements BA material will leave their daughter isotopes, a residual poisoning effect remains until EOC. If the BA consists of a single absorber isotope, the EOC residual poisoning penalty decreases. ~(167)Er is selected for the new concept of hybrid burnable absorber. Especially, it can burn with a almost flat burning rate for 4 years. Thus it is a suitable BA for a long period operation. This paper shows the impact of new BA compared with existing burnable absorbers, which are IFBA, WABA and Gd_2O_3. The Studsvik's design code system, CASMO-4E, is used for this study with ENDF/B-Ⅵ library.
机译：为了提高商用压水堆的核心性能，已经进行了许多研究，重点是设计核燃料组件，以增加反应堆堆芯的循环长度并提高安全裕度。引入可燃吸收剂（BAs）的原因有两个：1）控制过度的反应性，以及2）降低功率分布。先进的PWR堆芯设计要求在循环开始（BOC）时有足够的初始过量反应性，以进行长循环操作，并在循环结束（EOC）时具有较低的残留吸收剂损失以最大化循环长度。对于相同的反应性抑制效果和平坦的燃烧速率，BA需要在更小的数量上更有效，以最大程度地减少反应性波动。考虑到以上要求，基于单同位素的BA选择用于混合可燃吸收器的新设计。由于天然元素BA材料将离开其子同位素，因此残留的中毒效果将一直保留到EOC。如果BA由单个吸收剂同位素组成，则EOC残留中毒罚分降低。 〜（167）Er被选作混合可燃吸收器的新概念。特别是，它可以以几乎平坦的燃烧速率燃烧4年。因此，它是适合长期运行的BA。本文显示了与现有的可燃吸收剂（IFBA，WABA和Gd_2O_3）相比，新型BA的影响。研究使用Studsvik的设计代码系统CASMO-4E和ENDF /B-Ⅵ库。

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