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公开(公告)号：EP0237064B1
公开(公告)日：1991-03-20
申请号：EP87103564.8
申请日：1987-03-12
CPC分类号： G21C3/3563 , G21C3/322 , G21Y2002/201 , G21Y2004/30 , Y02E30/31 , Y02E30/32 , Y02E30/38
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2.发明公开Mixing grid for a nuclear reactor fuel assembly 失效MischgitterabstandshalterfürKernreaktorbrennelement。
公开(公告)号：EP0237064A2
公开(公告)日：1987-09-16
申请号：EP87103564.8
申请日：1987-03-12
CPC分类号： G21C3/3563 , G21C3/322 , G21Y2002/201 , G21Y2004/30 , Y02E30/31 , Y02E30/32 , Y02E30/38
摘要： A grid for use in nuclear fuel assemblies is made up of double grid members which are deformed so as to provide channels for the coolant. At least the upper portions (12) of these channels are inclined relative to the axes of the fuel rods and are disposed in such a manner as to cause circulation of fluid about each individual rod and within the assembly. In one embodiment the grid is positioned between the positioning grids and serves primarily as a coolant deflector. In another embodiment so constructed as to serve the positioning grid, as well as a flow deflector, the channels are straight in their lower portions i.e. parallel to the axes of the fuel rods. In their upper portions they curve to provide the desired deflection of the cooling fluid and the straight section hence they have a slight bow outward, relative to the plane of the grid member of which they are a part. This outwardly bowed portion engages the fuel rod and acts as a positioning spring. The grid members are cut away ajacent the straight sections to give the necessary flexibility. This design is particularly useful in pressurized water reactors. In grids intended for use in boiling water reactors, where the lateral loading is less severe, the straight portion can be omitted. The two plates may be welded together at their intersections, at their uppper edges only, while the lower edges are left free. In this case, the flexing of the grid memebers themselves serves to provide the spring forces necessary to position the fuel rods. In order to give improved flexibility, and proper fit with the rods when loaded, the surfaces of the channels which contact the fuel rods are given a twisted or helical formation.
摘要翻译： 用于核燃料组件的栅格由双栅格构件组成，其变形以提供用于冷却剂的通道。 这些通道的至少上部（12）相对于燃料棒的轴线是倾斜的，并且以使得流体围绕每个单独的杆和组件内部循环的方式设置。 在一个实施例中，格栅位于定位格栅之间，主要用作冷却剂导流板。 在如此构造以用于定位网格以及导流板的另一实施例中，通道在其下部中是直的，即平行于燃料棒的轴线。 在它们的上部，它们弯曲以提供冷却流体和直线部分的期望的偏转，因此它们相对于它们作为其一部分的网格构件的平面向外具有轻微的弓。 该向外的弓形部分接合燃料棒并用作定位弹簧。 网格构件在直线部分之间切割，以获得必要的灵活性。 该设计在压水反应堆中特别有用。 在用于沸水反应堆的网格中，横向载荷不太严重时，可以省略直线部分。 两个板可以在它们的交叉点处焊接在一起，仅在它们的上边缘处，而下边缘是自由的。 在这种情况下，栅格元件的弯曲本身用于提供定位燃料棒所需的弹簧力。 为了提供改进的灵活性，并且在加载时与棒适当配合，与燃料棒接触的通道的表面被赋予扭曲或螺旋形结构。
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公开(公告)号：EP0237064A3
公开(公告)日：1987-10-14
申请号：EP87103564
申请日：1987-03-12
CPC分类号： G21C3/3563 , G21C3/322 , G21Y2002/201 , G21Y2004/30 , Y02E30/31 , Y02E30/32 , Y02E30/38
摘要： A grid for use in nuclear fuel assemblies is made up of double grid members which are deformed so as to provide channels for the coolant. At least the upper portions (12) of these channels are inclined relative to the axes of the fuel rods and are disposed in such a manner as to cause circulation of fluid about each individual rod and within the assembly. In one embodiment the grid is positioned between the positioning grids and serves primarily as a coolant deflector. In another embodiment so constructed as to serve the positioning grid, as well as a flow deflector, the channels are straight in their lower portions i.e. parallel to the axes of the fuel rods. In their upper portions they curve to provide the desired deflection of the cooling fluid and the straight section hence they have a slight bow outward, relative to the plane of the grid member of which they are a part. This outwardly bowed portion engages the fuel rod and acts as a positioning spring. The grid members are cut away ajacent the straight sections to give the necessary flexibility. This design is particularly useful in pressurized water reactors. In grids intended for use in boiling water reactors, where the lateral loading is less severe, the straight portion can be omitted. The two plates may be welded together at their intersections, at their uppper edges only, while the lower edges are left free. In this case, the flexing of the grid memebers themselves serves to provide the spring forces necessary to position the fuel rods. In order to give improved flexibility, and proper fit with the rods when loaded, the surfaces of the channels which contact the fuel rods are given a twisted or helical formation.
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