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    • 4. 发明申请
    • FUEL ELEMENT WITH MULTI-SMEAR DENSITY FUEL
    • 具有多种密度燃料的燃料元件
    • WO2017091256A2
    • 2017-06-01
    • PCT/US2016/048392
    • 2016-08-24
    • TERRAPOWER, LLC
    • CHEATHAM, III, Jesse R.LATTA, Ryan N.MILLER, Samuel J.
    • G21C3/04G21C1/026G21C3/16G21C3/42G21C7/005G21C21/08G21C2003/045G21C2003/047G21D3/001Y02E30/34Y02E30/39
    • A fuel element has a ratio of area of fissionable nuclear fuel in a cross-section of the tubular fuel element perpendicular to the longitudinal axis to total area of the interior volume in the cross-section of the tubular fuel element that varies with position along the longitudinal axis. The ratio can vary with position along the longitudinal axis between a minimum of 0.30 and a maximum of 1.0. Increasing the ratio above and below the peak burn-up location associated with conventional systems reduces the peak burn-up and flattens and shifts the burn-up distribution, which is preferably Gaussian. The longitudinal variation can be implemented in fuel assemblies using fuel bodies, such as pellets, rods or annuli, or fuel in the form of metal sponge and meaningfully increases efficiency of fuel utilization.
    • 燃料元件在垂直于纵轴的管状燃料元件的横截面中具有可裂变核燃料的面积与管的横截面中的内部体积的总面积之比 燃料元件随着沿纵向轴线的位置而变化。 该比例可以随着沿纵轴的位置在最小值0.30和最大值1.0之间变化。 增加高于和低于与常规系统相关的峰值燃烧位置的比率减少了峰值燃烧并使扁平化并改变了燃烧分布,其优选为高斯分布。 纵向变化可以在燃料组件中实现,使用燃料体,例如球团,棒或环,或者金属海绵形式的燃料,并且有意义地提高燃料利用效率。