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首页> 外文会议>International conference on the physics of reactors;PHYSOR 2010 >CORE ANALYSIS, DESIGN AND OPTIMIZATION OF A DEEP-BURN PEBBLE BED REACTOR
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CORE ANALYSIS, DESIGN AND OPTIMIZATION OF A DEEP-BURN PEBBLE BED REACTOR

机译：深烧卵石床反应器的核心分析，设计与优化

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摘要

Achieving a high fuel burnup in the Deep-Bum pebble bed reactor design, while remaining within prescribes safety limits for fuel temperature, power peaking and temperature reactivity feedback, is challenging. The high content of Pu and Minor Actinides in the Deep-Burn fuel significantly impacts the thermal neutron energy spectrum as compared to a 'standard' UO_2 fueled core. Regions in the pebble bed core near the graphite reflectors experience power and temperature peaking that result from the local softer neutron energy spectrum. Furthermore, the interplay of the Pu resonances of the neutron absorption cross sections at low-lying energies can lead to a positive temperature reactivity coefficient for the graphite moderator under certain operating conditions.To investigate the aforementioned effects a new code system based on existing codes has been developed for neutronic, thermal-hydraulic and fuel depletion analysis of Deep-Burn pebble bed reactors. A core analysis of a Deep-Burn Pebble Bed Modular Reactor (400 MW_(th) design has been performed for two Deep-Burn fuel types and possible improvements of the design with regard to power peaking and temperature reactivity feedback are identified.
机译：在Deep-Bum卵石床反应器设计中实现高燃耗，同时保持在规定的燃料温度，功率峰值和温度反应性反馈安全限值之内，是具有挑战性的。与“标准” UO_2燃料堆芯相比，深层燃烧燃料中的Pu和次Act系元素含量高，显着影响热中子能谱。卵石床芯中靠近石墨反射器的区域会经历功率和温度峰值，这是由局部较弱的中子能谱引起的。此外，中子吸收截面的Pu共振在低能量下的相互作用可能导致在某些工作条件下石墨减速剂的正温度反应系数。 为了研究上述效果，已经开发了基于现有规范的新规范系统，用于深烧卵石床反应堆的中子，热工和燃料消耗分析。对两种深燃燃料类型进行了深烧卵石床模块化反应堆（400兆瓦（热）设计）的核心分析，并确定了在功率峰值和温度反应性反馈方面设计的可能改进。

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