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公开(公告)号：US4576787A
公开(公告)日：1986-03-18
申请号：US564048
申请日：1983-12-21
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。
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公开(公告)号：US4699749A
公开(公告)日：1987-10-13
申请号：US731259
申请日：1985-05-07
申请人： Kevin R. McAtee , Brian H. Alsop
发明人： Kevin R. McAtee , Brian H. Alsop
CPC分类号： G21C7/00 , G21Y2002/204 , G21Y2002/206 , G21Y2004/40 , G21Y2004/401 , Y02E30/32 , Y02E30/39
摘要： In a pressurized water reactor in which a dropped control rod is detected by a negative rate of change of neutron flux which exceeds a preset negative limit, the reactor is only shutdown if the axial offset exceeds a preselected limit, so that it is possible to maintain power, and in many cases full power, despite the presence of a dropped rod. Where part length control rods are used during power changes, separate limiting values on axial offset are used when these rods are fully inserted and when they are fully retracted.
摘要翻译： 在其中通过超过预设负极限的中子通量的负变化率检测到下降的控制棒的压水反应器中，如果轴向偏移超过预选极限，则反应器仅关闭，使得可以维持 力量，并且在许多情况下，全功率，尽管存在一个落杆。 在功率变化期间使用部件长度控制杆的情况下，当这些杆完全插入并完全缩回时，将使用轴向偏移上的单独限制值。
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公开(公告)号：US4751043A
公开(公告)日：1988-06-14
申请号：US912664
申请日：1986-09-29
IPC分类号： G21C11/06
摘要： A radial neutron reflector is disclosed for a light water nuclear reactor. The irregular space between the core periphery and the core barrel surrounding the core is filled with a structure comprising material other than hydrogen such as zirconia or stainless steel so as to displace the reactor water coolant in this region. The structure is provided with appropriately sized flow holes to pass reactor coolant therethrough and to balance the pressure within the structure to substantially coincide with the axial pressure profile at the core periphery.
摘要翻译： 公开了一种用于轻水核反应堆的径向中子反射器。 围绕芯部的芯部周边和芯部筒体之间的不规则空间填充有包括除氢之外的材料（例如氧化锆或不锈钢）的结构，以便使该区域中的反应堆水冷却剂移位。 该结构设置有适当尺寸的流动孔，以使反应堆冷却剂通过其中并且平衡结构内的压力以与芯部周边处的轴向压力分布基本一致。
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4.发明授权Nuclear fuel rod containing a hybrid gadolinium oxide, boron carbide burnable absorber 失效含有混合氧化钆的核燃料棒，碳化硼可燃吸收剂
公开(公告)号：US4671927A
公开(公告)日：1987-06-09
申请号：US677766
申请日：1984-12-03
申请人： Brian H. Alsop
发明人： Brian H. Alsop
摘要： A nuclear fuel rod contains nuclear fuel pellets that have incorporated therein a hybrid burnable absorber that affects a moderation of the burn-out rate of the system containing the rod. The nuclear fuel pellets contain 1 to 20 percent by weight gadolinium oxide and 0.02 to 1.0 percent by weight of boron carbide particles of a size between 20 to 100 microns in diameter, the particles coated with a 0.5 to 10 micron thick coating of a helium gas-impervious coating.
摘要翻译： 核燃料棒包含核燃料颗粒，其中并入有混合可燃性吸收剂，其影响包含棒的系统的燃尽率的温和。 核燃料颗粒包含1至20重量％的氧化钆和0.02至1.0重量％的直径为20至100微米之间的碳化硼颗粒，涂覆有0.5至10微米厚的氦气涂层的颗粒 不透明涂层
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