公开(公告)号：US06931090B2

公开(公告)日：2005-08-16

申请号：US10374691

申请日：2003-02-25

申请人： Yung-An Chao ,  Shengyi Si ,  Frank D. Popa

发明人： Yung-An Chao ,  Shengyi Si ,  Frank D. Popa

IPC分类号： G21C21/00 ,  G21C5/00 ,  G21C5/02 ,  G21C7/00 ,  G21C17/00 ,  G21C19/20 ,  G21C19/00

CPC分类号： G21C5/00 ,  G21C5/02 ,  G21C7/00 ,  G21C19/205 ,  G21D3/001 ,  G21D2003/002 ,  G21Y2002/201 ,  G21Y2002/304 ,  G21Y2004/40 ,  G21Y2004/403 ,  Y02E30/39

摘要： All possible loading patterns for a nuclear reactor core are searched and optimized for compliance with design constraints. The fuel inventory is divided into a few batches according to coarse levels of reactivity. A recursive enumeration process identifies patterns meeting selected core position constraints, which can be user modified to adjust the search space size. For the batch loading patterns satisfying the constraints, the batches are divided into several smaller batches. A sensitivity matrix linearizing the relationship between fuel assembly position and the depletion model is processed through mixed integer linear programming with branching and bounding to identify an optimal daughter loading pattern. The process is repeated through several levels of batch refinement and selection of optimal daughter patterns, including a level where burnable absorbers are assigned to feed assemblies, until the individual fuel assembly level is reached. The multiple optimal patterns remaining provide a range of solutions.

摘要翻译： 搜索和优化核反应堆核心的所有可能的加载模式，以符合设计约束。 燃料库存根据粗略的反应性分为几批。 递归计数过程确定满足选定核心位置约束的模式，可以通过用户修改来调整搜索空间大小。 对于满足约束的批量加载模式，批次分为几个较小的批次。 通过具有分支和边界的混合整数线性规划来处理线性化燃料组装位置和耗尽模型之间的关系的灵敏度矩阵，以识别最佳的子载荷模式。 该过程通过几个级别的批次精炼和最佳子模式的选择重复，包括将可燃吸收器分配给进料组件的水平，直到达到单独的燃料组件水平。 剩余的多种最佳模式提供了一系列解决方案。

公开(公告)号：US4576787A

公开(公告)日：1986-03-18

申请号：US564048

申请日：1983-12-21

申请人： Brian H. Alsop ,  Frank D. Popa ,  William E. Edwards

发明人： Brian H. Alsop ,  Frank D. Popa ,  William E. Edwards

IPC分类号： G21C7/04 ,  G21C3/32

CPC分类号： G21C7/04 ,  G21Y2002/201 ,  G21Y2004/30 ,  Y02E30/39

摘要： Elongated tubular elements containing burnable absorber material are clustered in an array to provide a burnable absorber assembly for insertion within one or more guide thimbles of a fuel assembly for controlling reactivity. The burnable absorber assembly, in alternative embodiments, include three tubular elements in triangular relationship and four tubular elements in rectangular relationship. The use of the burnable absorber assembly within the guide thimbles of a fuel assembly results in increased core thermal margin, minimization of end of cycle reactivity penalty, increase in operating cycle length before required refueling, and the ability to utilize burnable absorber assemblies having different strengths at different locations within the fuel assembly for controlling fuel assemblies having significant power gradients, as well as finer control of radial powered distribution and thus achieving lower peaking factors.

摘要翻译： 包含可燃性吸收材料的细长管状元件聚集在阵列中，以提供可燃的吸收器组件，用于插入燃料组件的一个或多个引导套管中，用于控制反应性。 在可选实施例中，可燃吸收器组件包括三个关系的三个管状元件和四个矩形关系的管状元件。 在燃料组件的引导套管内使用可燃吸收器组件导致核心热量裕度增加，循环反应性损失终止的最小化，所需加油之前的操作循环长度的增加以及使用具有不同强度的可燃吸收器组件的能力 在燃料组件内的不同位置处，用于控制具有显着功率梯度的燃料组件，以及更好地控制径向动力分配，从而实现较低的峰值因数。

公开(公告)号：US4678629A

公开(公告)日：1987-07-07

申请号：US772826

申请日：1985-09-05

申请人： Frank D. Popa

发明人： Frank D. Popa

IPC分类号： G21C3/62 ,  G21C3/18 ,  G21C3/00

CPC分类号： G21C3/18 ,  Y02E30/40

摘要： The present invention relates to a nuclear fuel pellet having two sections: a cylindrical inner pellet inside of an annular outer pellet. The inner pellet is composed of gadolinia and natural or depleted uranium as UO.sub.2. The outer pellet contains enriched uranium as UO.sub.2 but without gadolinia.

摘要翻译： 本发明涉及具有两个部分的核燃料颗粒：环形外颗粒内部的圆柱形内颗粒。 内部颗粒由氧化钆和天然或贫化铀组成，如UO2。 外部颗粒含有浓缩铀作为UO2，但不含钆。

公开(公告)号：US07224761B2

公开(公告)日：2007-05-29

申请号：US10993249

申请日：2004-11-19

申请人： Frank D. Popa

发明人： Frank D. Popa

IPC分类号： G21C19/00

CPC分类号： G21C19/205 ,  G21Y2002/201 ,  G21Y2002/304 ,  G21Y2004/40

摘要： A method is for establishing a nuclear reactor core loading pattern (LP) for fuel assemblies and burnable absorbers (BAs). The method establishes an optimum LP through the steps of: a) providing nuclear data representing fuel assemblies and BAs in a nuclear reactor core; b) depleting the nuclear data to form a reference core depletion; c) incorporating the nuclear data into a system of linear equations of a nuclear design quality flux solution method; d) defining the system of linear equations to include constraints which accurately represent the neutron physics of the reactor; employing the equations as a constraint matrix for a MIP solver to find an optimum core pattern solution; f) repeating steps b) through e) updating the constraints and objective functions to satisfy specified engineering requirements and establish an optimum core loading pattern. An algorithm for deriving the system of equations is also disclosed.

摘要翻译： 一种用于建立燃料组件和可燃吸收器（BAs）的核反应堆堆芯装载模式（LP）的方法。 该方法通过以下步骤建立最佳LP：a）在核反应堆核心中提供代表燃料组件和BAs的核数据; b）消耗核数据以形成参考核心耗尽; c）将核数据纳入核设计质量通量溶液法线性方程组; d）定义线性方程组，以包括精确表示反应堆中子物理学的约束; 采用方程作为MIP求解器的约束矩阵以找到最佳核心图案解; f）重复步骤b）至e）更新约束和目标函数以满足规定的工程要求并建立最佳的核心加载模式。 还公开了用于导出方程组的算法。