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Advanced reactor physics methods for heterogeneous reactor cores.

机译：异构反应堆堆芯的先进反应堆物理方法。

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摘要

To maintain the economic viability of nuclear power the industry has begun to emphasize maximizing the efficiency and output of existing nuclear power plants by using longer fuel cycles, stretch power uprates, shorter outage lengths, mixed-oxide (MOX) fuel and more aggressive operating strategies. In order to accommodate these changes, while still satisfying the peaking factor and power envelope requirements necessary to maintain safe operation, more complexity in commercial core designs have been implemented, such as an increase in the number of sub-batches and an increase in the use of both discrete and integral burnable poisons. A consequence of the increased complexity of core designs, as well as the use of MOX fuel, is an increase in the neutronic heterogeneity of the core. Such heterogeneous cores introduce challenges for the current methods that are used for reactor analysis. New methods must be developed to address these deficiencies while still maintaining the computational efficiency of existing reactor analysis methods.;In this thesis, advanced core design methodologies are developed to be able to adequately analyze the highly heterogeneous core designs which are currently in use in commercial power reactors. These methodological improvements are being pursued with the goal of not sacrificing the computational efficiency which core designers require. More specifically, the PSU nodal code NEM is being updated to include an SP3 solution option, an advanced transverse leakage option, and a semi-analytical NEM solution option.
机译：为了维持核电的经济生存能力，业界开始强调通过使用更长的燃料循环，延长功率升级，更短的停机时间，混合氧化物（MOX）燃料和更积极的运行策略来最大化现有核电厂的效率和输出。为了适应这些变化，同时仍满足维持安全运行所必需的峰值因数和功率包络要求，商业核心设计已实现了更高的复杂性，例如子批次数量的增加和使用的增加离散和整体可燃毒物。堆芯设计的复杂性增加以及使用MOX燃料的结果是堆芯的中子异质性增加。这种异质岩心给用于反应堆分析的当前方法带来了挑战。必须开发新方法以解决这些缺陷，同时仍保持现有反应堆分析方法的计算效率。；本文中，开发了先进的堆芯设计方法，以能够充分分析目前在商业中使用的高度异构的堆芯设计电力反应堆。为了不牺牲核心设计者所需的计算效率，正在追求这些方法上的改进。更具体地说，PSU节点代码NEM正在更新，以包括SP3解决方案选项，高级横向泄漏选项和半分析NEM解决方案选项。

著录项

  • 作者

    Thompson, Steven A.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Nuclear engineering.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 163 p.
  • 总页数 163
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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