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Fuel with advanced burnable absorbers design for the IRIS reactor core: Combined Erbia and IFBA

机译：用于IRIS反应堆堆芯的具有先进可燃吸收剂的燃料设计：Erbia和IFBA组合

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摘要

IRIS is an advanced medium-size (1000MW) PWR with integral primary system targeting deployment already around 2015-2017. Consistent with its aggressive development and deployment schedule, the "first IRIS" core design assumes current, licensed fuel technology, i.e., UO_2 fuel with less than 5% ~(235)U enrichment. The core consists of 89 fuel assemblies employing the 17×17 Westinghouse Robust Fuel Assembly (RFA) design and Standard Fuel dimensions. The adopted design enables to meet all the objectives of the first IRIS core, including over 3-year cycle length with low soluble boron concentration, within the envelope of licensed, readily available fuel technology. Alternative fuel designs are investigated for the subsequent waves of IRIS reactors in pursuit of further improving the fuel utilization and/or extending the cycle length. In particular, an increase in the lattice pitch from the current 0.496 in. for the Standard Fuel to 0.523 in. is among the objectives of this study. The larger fuel pitch and increased moderator-to-fuel volume ratio that it entails fosters better neutron thermalization in an altogether under-moderated lattice thereby offering the potential for considerable increase of fuel utilization and cycle length, up to 5% in the two-batch fuel management scheme considered for IRIS. However, the improved moderation also favors higher values of the Moderator Temperature Coefficient, MTC, which must be properly counteracted to avoid undesired repercussions on the plant safety parameters or controllability during transient operations. This paper investigates counterbalancing the increase in the MTC caused by the enhanced moderation lattice by adopting a suitable choice of fuel burnable absorber (BA). In particular, a fuel design combining erbia, which benefits MTC due to its resonant behavior but leads to residual reactivity penalty, and IFBA, which maximizes cycle length, is pursued. In the proposed approach, IFBA provides the bulk of the hold-down, with no penalty on cycle length, while the amount of erbia is adjusted to obtain the desired margin in the core peaking power and MTC. Preliminary economic analysis proves that within the IRIS design envelope, the combined BA fuel together with the enhanced moderation lattice offer the potential for considerable fuel cycle cost savings when compared to the current core design based on the Westinghouse Standard 17×17 lattice with IFBA. Therefore a combined BA fuel with the enhanced moderation lattice is a promising option to consider for future developments of the IRIS core.
机译：IRIS是一种先进的中型（1000MW）压水堆，其整体主要系统已在2015-2017年左右部署。根据其激进的开发和部署计划，“第一个IRIS”核心设计采用了当前许可的燃料技术，即UO_2燃料的浓缩度不到5％〜（235）U。核心由89个燃料组件组成，这些组件采用17×17西屋稳健燃料组件（RFA）设计和标准燃料尺寸。采用的设计能够满足首个IRIS核的所有目标，包括在许可的，易于获得的燃料技术范围内的3年以上的循环长度和低可溶硼浓度。为了进一步提高燃料利用率和/或延长循环长度，对随后的IRIS反应堆波研究了替代燃料设计。特别是，将晶格间距从标准燃料的当前0.496英寸增加到0.523英寸是本研究的目标之一。随之而来的更大的燃料螺距和增加的调节剂与燃料的体积比可促进完全欠调节的晶格中更好的中子热化，从而有可能显着提高燃料利用率和循环长度，在两个批次中最高可达5％为IRIS考虑的燃油管理计划。但是，改进的适度性也有利于较高的“缓和器温度系数”（MTC）值，必须适当抵消该值，以避免在过渡运行期间对工厂安全参数或可控性产生不良影响。本文研究了通过采用适当的燃料可燃吸收器（BA）选择来抵消由增强的适度晶格引起的MTC的增加。特别地，寻求一种燃料设计，其结合了因其共振行为而使MTC受益但导致残留的反应性损失的erbia和使循环长度最大化的IFBA。在提出的方法中，IFBA提供了大部分的抑制功能，而对周期长度没有任何影响，同时调整了误差量以在核心峰值功率和MTC中获得所需的余量。初步的经济分析证明，与基于IFBA的西屋标准17×17标准当前的核心设计相比，在IRIS设计范围内，组合的BA燃料与增强的适度晶格相结合可以节省大量燃料成本。因此，结合增强型缓和晶格的BA燃料是IRIS核芯未来发展的有前途的选择。

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  • 来源
    《Annals of nuclear energy》 |2009年第8期|1201-1207|共7页
  • 作者

    Fausto Franceschini; Bojan Petrovic;

  • 作者单位

    Westinghouse Electric Company LLC, Science and Technology Department, Pittsburgh, PA 15235, USA;

    Ceorgia Institute of Technology. Nuclear and Radiological Engineering, C.W. Woodruff School, Atlanta, CA 30332-0405, USA;

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