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首页> 外文会议>International conference on the physics of reactors;PHYSOR 2010 >Neutronic Evaluation of Breed-and-Burn Reactor Fuel Types Using an Infinite-Medium Depletion Approximation
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Neutronic Evaluation of Breed-and-Burn Reactor Fuel Types Using an Infinite-Medium Depletion Approximation

机译：使用无限中等耗竭近似对燃放式反应堆燃料类型进行中子学评估

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A new method of analyzing breed-and-burn reactors is developed which allows the reactor's equilibrium-cycle reactivity to be stated in terms of the depletion history of the fertile feed fuel. The method is centered on calculating the total number of neutrons produced and absorbed by a volume of feed fuel over its depletion history. The net number of neutrons produced or absorbed over the feed fuel's life is termed its neutron excess. Neutron excess is found to be insensitive to a number of factors, including reactor geometry, cycle length, discharge burnup distribution, and equilibrium-cycle shuffling path. This allows the reactivity-burnup relationship for a breed-and-burn reactor to be accurately estimated using simple one-dimensional models. One method of approximating the feed-fuel depletion history is to deplete an infinite medium of feed material in its self-produced spectrum. Performing a neutron excess calculation on the infinite-depletion case allows a reactivity estimate to be made, which is found to agree closely with reactivities calculated in actual models of a breed-and-burn system. The infinite-medium approximation is applied to compare the neutronic performance of different metal and ceramic fuels, including thorium. The minimum burnup and fast fluence required to sustain breed-and-burn operation is reported for each fuel. Uranium-zirconium alloys are found to be the best performing metal fuels while U_3Si_2 and uranium nitride with enriched nitrogen-15 were found to be the best performing ceramic fuels.
机译：开发了一种新的分析燃放型反应堆的方法，该方法可以根据肥沃的进料燃料的消耗历史来说明反应堆的平衡循环反应性。该方法集中在计算在其消耗历史上一定体积的进料燃料产生和吸收的中子总数。在进料燃料寿命内产生或吸收的中子净数称为其中子过量。发现中子过量对许多因素不敏感，包括反应堆几何形状，循环长度，放电燃耗分布和平衡循环改组路径。这使得可以使用简单的一维模型来准确估算一个品种-燃烧反应堆的反应性-燃耗关系。近似进料燃料消耗历史的一种方法是在其自身产生的光谱中消耗无限量的进料。在无穷尽情况下执行中子过量计算可以进行反应性估计，发现该反应性与在繁殖燃烧系统的实际模型中计算出的反应性非常吻合。应用无限介质近似法来比较包括metal在内的不同金属和陶瓷燃料的中子性能。报告了每种燃料维持燃放运行所需的最低燃耗和快速通量。铀-锆合金被认为是性能最好的金属燃料，而U_3Si_2和富含氮15的氮化铀被认为是性能最好的陶瓷燃料。

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