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公开(公告)号：US4826654A
公开(公告)日：1989-05-02
申请号：US946960
申请日：1986-12-29
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly comprises a plurality of fuel rods, moderator rods disposed among the fuel rods, upper and lower tie plates for holding both end portions of the fuel rods and the moderator rods, and fuel spacers for keeping distances between the fuel rods and the moderator rods constant. The fuel assembly is characterized in that there is provided a space region extending from the upper tie plate to the lower tie plate and having a space enough to dispose at least one of the fuel rods. At least one of the moderator rods being disposed adjacent to the space region. The fuel rods, the moderator rods, and the space region are disposed in a grid form.
摘要翻译： 燃料组件包括多个燃料棒，设置在燃料棒之间的调节杆，用于保持燃料棒和调节杆的两个端部的上部和下部连接板以及用于保持燃料棒和调节剂之间的距离的燃料间隔件 棒常数。 燃料组件的特征在于，设置有从上连接板延伸到下连接板的空间区域，并且具有足以设置至少一个燃料棒的空间。 至少一个调节杆设置成与该空间区域相邻。 燃料棒，调节杆和空间区域以网格形式布置。
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公开(公告)号：US4789520A
公开(公告)日：1988-12-06
申请号：US77513
申请日：1987-07-24
申请人： Yuichi Morimoto , Hiromi Maruyama , Motoo Aoyama , Atsushi Zukeran , Yasunori Bessho , Tomoyuki Matsumoto , Yoshihiko Ishii , Kouji Fujimura , Sadao Uchikawa
发明人： Yuichi Morimoto , Hiromi Maruyama , Motoo Aoyama , Atsushi Zukeran , Yasunori Bessho , Tomoyuki Matsumoto , Yoshihiko Ishii , Kouji Fujimura , Sadao Uchikawa
CPC分类号： G21C3/328 , G21Y2002/20 , G21Y2004/10 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly is composed of first fuel rods containing nuclear fuel material and burnable poison material and second fuel rods containing nuclear fuel material but no burnable poison material. The fuel assembly is charged in a high conversion area of a boiling water type nuclear reactor having a reactor core having the high conversion area and a burner area surrounding the high conversion area. A ratio V.sub.C /V.sub.F is not greater than 1.5 in the fuel assembly where V.sub.C is the volume occupied by coolant flow paths and V.sub.F is the volume occupied by the nuclear fuel material per unit length in an axial direction of the fuel assembly. In addition, the burnable poison material is composed of neutron absorption nuclides having at least one resonant energy in a neutron energy region of one electron volt or less.
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公开(公告)号：US5207979A
公开(公告)日：1993-05-04
申请号：US496309
申请日：1990-03-20
申请人： Junichi Koyama , Motoo Aoyama , Akinobu Nakajima , Yasunori Bessho , Junichi Yamashita , Sadao Uchikawa , Hiromi Maruyama , Michihiro Ozawa , Mitsunari Nakamura
发明人： Junichi Koyama , Motoo Aoyama , Akinobu Nakajima , Yasunori Bessho , Junichi Yamashita , Sadao Uchikawa , Hiromi Maruyama , Michihiro Ozawa , Mitsunari Nakamura
IPC分类号： G21C3/326
CPC分类号： G21C3/326 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A nuclear fuel assembly has an array of fuel rods comprising a plurality of first fuel rods each containing nuclear fuel material but not containing burnable poison and a plurality of further fuel rods each containing both nuclear fuel material and burnable poison. The further fuel rods comprise second fuel rods and third fuel rods, and each second fuel rod has at a lower region of the fuel assembly a burnable poison concentration which is a minimum burnable poison concentration in the further fuel rods. To increase the effectiveness of the second fuel rods in controlling axial power peaking, as seen in plan view on the array, the first fuel rods are the nearest neighbors of each further fuel rod.
摘要翻译： 核燃料组件具有燃料棒阵列，其包括多个第一燃料棒，每个第一燃料棒包含核燃料材料但不含有可燃毒物，以及多个另外的燃料棒，每个燃料棒同时包含核燃料材料和可燃毒物。 另外的燃料棒包括第二燃料棒和第三燃料棒，并且每个第二燃料棒在燃料组件的较低区域处具有在另外的燃料棒中是可燃毒物浓度的可燃毒物浓度。 为了提高第二燃料棒在控制轴向功率峰化方面的有效性，如在阵列的平面图中所见，第一燃料棒是每个另外的燃料棒的最邻近的。
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公开(公告)号：US4832906A
公开(公告)日：1989-05-23
申请号：US850680
申请日：1986-04-11
申请人： Motoo Aoyama , Hiromi Maruyama , Yasunori Bessho , Sadao Uchikawa
发明人： Motoo Aoyama , Hiromi Maruyama , Yasunori Bessho , Sadao Uchikawa
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2002/301 , G21Y2004/10 , G21Y2004/30 , Y02E30/38 , Y10S376/903 , Y10S376/917
摘要： A fuel assembly comprises a channel box, upper and lower tie plates fixed to the upper and lower portion of the channel box and a bundle of fuel rods enclosed in the channel box and retained by the upper and lower tie plates. The bundle of fuel rods includes ordinary fuel rods containing fissile material not containing gadolinia, and gadolinia-containing rods each containing gadolinia therein and having a larger outer diameter than that of the ordinary fuel rod. The gadolinia-containing rod has pellets enclosed in a closed cladding, and the outer diameters of the pellets also are larger than these of fuel pellets of the ordinary fuel rods.
摘要翻译： 燃料组件包括通道箱，固定到通道箱的上部和下部的上部和下部固定板，以及封闭在通道箱中并由上部和下部连接板保持的燃料棒束。 燃料棒束包括含有不含钆的裂变材料的普通燃料棒和含有氧化钆并且具有比普通燃料棒大的外径的含钆棒。 含钆棒具有封闭在封闭包层中的颗粒，并且颗粒的外径也大于普通燃料棒的燃料颗粒的外径。
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公开(公告)号：US5008070A
公开(公告)日：1991-04-16
申请号：US268595
申请日：1988-11-07
申请人： Motoo Aoyama , Junichi Koyama , Sadao Uchikawa , Yasunori Bessho , Michihiro Ozawa , Mitsunari Nakamura , Akinobu Nakajima , Hiromi Maruyama
发明人： Motoo Aoyama , Junichi Koyama , Sadao Uchikawa , Yasunori Bessho , Michihiro Ozawa , Mitsunari Nakamura , Akinobu Nakajima , Hiromi Maruyama
IPC分类号： G21C3/326
CPC分类号： G21C3/326 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly has a plurality of first fuel rods each of which contains nuclear fuel material but does not contain burnable poison, and a plurality of second fuel rods each of which includes nuclear fuel material and burnable poison. The amount of burnable poison in a lower region of the fuel assembly is smaller than that in an upper region thereof. When each of the second fuel rods is divided into an upper region and a lower region, a region of the divided regions in the second fuel rods containing a maximum burnable poison concentration Gmax and a region of the divided regions in the second fuel rods containing a minimum burnable poison concentration Gmin are located in the lower region of the fuel assembly. The burnable poison concentration of the upper region of each second fuel rod is between Gmax and Gmin. The fuel assembly may moderate a maximum linear heat rating with an increased spectral shift effect.
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公开(公告)号：US4851181A
公开(公告)日：1989-07-25
申请号：US123542
申请日：1987-11-20
申请人： Renzo Takeda , Kanji Kato , Tadahiro Ohnishi , Sadao Uchikawa , Hiromi Maruyama , Motoo Aoyama , Kikuo Umegaki , Yasunori Bessho , Motomasa Fuse , Michiro Yokomi
发明人： Renzo Takeda , Kanji Kato , Tadahiro Ohnishi , Sadao Uchikawa , Hiromi Maruyama , Motoo Aoyama , Kikuo Umegaki , Yasunori Bessho , Motomasa Fuse , Michiro Yokomi
摘要： In a light water moderation type nuclear reactor with the once-through method, the reactor core is divided into a central area and a peripheral area by a partition member, a first fuel assembly is arranged in the central area (high conversion area) and a second fuel assembly is arranged in the peripheral area. The ratio (r.sub.H/U) of the number of hydrogen atoms to that of uranium atoms in the central area is smaller than that of the ratio in the peripheral area and the second fuel assembly in the peripheral area is formed of fuel rods of the first fuel assembly having been previously burned in the central area and moved into the peripheral area. The plutonium production increases and uranium consumption is reduced during the first half of the lifetime of the fuel rods in the high conversion area with the take-up burn up increasing during the second half of the lifetime of the fuel rods in the burner area.
摘要翻译： 在具有一次通过方法的轻水调节型核反应堆中，反应堆堆芯通过分隔构件分成中心区域和周边区域，第一燃料组件布置在中心区域（高转化区域）和 第二燃料组件布置在周边区域中。 中心区域的氢原子数与铀原子数的比值（rH / U）小于外围区域的比例，并且周边区域中的第二燃料组件的比率（rH / U）由第一 燃料组件先前已经在中心区域燃烧并移动到周边区域。 在高转化率区域的燃料棒的寿命的前半期，钚的生产增加，铀的消耗减少，在燃烧器区域的燃料棒的寿命的后半期，吸收燃烧增加。
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公开(公告)号：US4876062A
公开(公告)日：1989-10-24
申请号：US172418
申请日：1988-03-24
申请人： Motoo Aoyama , Yasunori Bessho , Sadao Uchikawa , Renzo Takeda , Yoshihiko Ishii
发明人： Motoo Aoyama , Yasunori Bessho , Sadao Uchikawa , Renzo Takeda , Yoshihiko Ishii
CPC分类号： G21C3/322 , G21C2003/3225 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly of the present invention comprises a plurality of fuel rods which are held by an upper tie plate and lower tie plate at the ends thereof and a moderating rod which is arranged between the fuel rods and held by the lower tie plate at its lower end. The fuel rods are arranged in a lattice form having 9 rows and 9 columns, and the moderating rod contains a passage for a coolant and has a cruciate cross-sectional form. The ratio A.sub.M /A.sub.C of the area A.sub.M of a moderator region in the moderating rod in the cross-sectional plane in which the moderator is present to the area A.sub.C of the coolant passages in said fuel assembly is within the range of 0.07 to 0.11, and the area A.sub.M is 75% or more of the total area of the fuel lattice units in which none of the fuel rods is arranged, but the moderating rod is arranged.
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公开(公告)号：US4632803A
公开(公告)日：1986-12-30
申请号：US529760
申请日：1983-09-06
申请人： Yasunori Bessho , Sadao Uchikawa , Motoo Aoyama
发明人： Yasunori Bessho , Sadao Uchikawa , Motoo Aoyama
CPC分类号： G21C7/00 , G21Y2002/201 , G21Y2004/40 , Y02E30/31 , Y02E30/39
摘要： In the operation of a boiling water reactor, when the core flow rate is decreased due to a trip of the circulating pump, the control rod pattern is suitably changed to avoid unnecessary scram of the control rods. The change of the control rod pattern is made by driving control rods which have been inserted to small depth deeper into a depth near 12/24 of the core height. In addition to this control rod operation, the control rods which have been inserted to large depth are withdrawn to a depth near 12/24 or, alternatively, the control rods which have not been inserted at all are inserted to the depth of about 12/24 of the core height.
摘要翻译： 在沸水反应器的操作中，当由于循环泵跳闸而使芯流量降低时，适当地改变控制棒图案以避免控制棒的不必要的冲击。 控制杆图案的改变是通过将已经插入深度较小的控制棒驱动到芯高度的12/24附近的深度来进行的。 除了该控制杆操作之外，已经插入到大深度的控制杆被撤回至接近12/24的深度，或者替代地，还没有插入的控制杆插入到大约12 / 24的核心高度。
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公开(公告)号：US4695425A
公开(公告)日：1987-09-22
申请号：US657082
申请日：1984-10-03
申请人： Motoo Aoyama , Hiromi Maruyama , Kikuo Umegaki , Sadao Uchikawa
发明人： Motoo Aoyama , Hiromi Maruyama , Kikuo Umegaki , Sadao Uchikawa
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/10 , G21Y2004/30 , G21Y2004/60 , Y02E30/38
摘要： A fuel assembly having a plurality of fuel rods arranged in a lattice state and being charged into a core of a nuclear reactor using light water as a coolant, which comprises the fuel rods consisting of a first group of fuel rods and a second group of fuel rods, an average concentration of U.sup.236 in the first group being lower than an average concentration of U.sup.236 in the second group, and the first group and the second group being arranged unevenly in the fuel assembly, preferably, a fuel assembly wherein the first group is arranged at the periphery of the fuel assembly, and the second group being arranged at positions other than the periphery, has a low reactivity penalty due to U.sup.236 and can reduce the requirements for natural uranium.
摘要翻译： 一种燃料组件，其具有以格状状布置的多个燃料棒，并使用轻水作为冷却剂装入核反应堆的核心，燃料棒包括由第一组燃料棒组成的燃料棒和第二组燃料 第一组中的U236的平均浓度低于第二组中的U236的平均浓度，并且第一组和第二组不均匀地布置在燃料组件中，优选地，其中第一组为 布置在燃料组件的周边，并且第二组布置在除了外围之外的位置，由于U236而具有低的反应性损失，并且可以降低对天然铀的要求。
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公开(公告)号：US5202085A
公开(公告)日：1993-04-13
申请号：US760964
申请日：1991-09-17
申请人： Motoo Aoyama , Taro Ueki , Akinobu Nakajima , Sadao Uchikawa , Junichi Yamashita
发明人： Motoo Aoyama , Taro Ueki , Akinobu Nakajima , Sadao Uchikawa , Junichi Yamashita
摘要： A fuel assembly has a plurality of first fuel rods and a plurality of second fuel rods having a shorter length in an axial direction than the first fuel rods. The second fuel rod is loaded with natural uranium in full length of its effective fuel length portion. The fuel assembly has a water rod having a larger horizontal cross sectional area at the upper region than the area at the lower region. The second fuel rods are arranged downward of the upper region of the water rod and adjacent to the lower region of the water rod. The width of the horizontal cross sectional area of the lower region of the water rod is set so as to locate the minimum values of both thermal neutron flux and resonance neutron flux in the horizontal direction of the fuel assembly at an outer side with respect the location of the second fuel rod in the horizontal direction. In accordance with the present invention, the H/U ratio in the axial direction becomes close to the optimum value, and increment of the resonance neutron absorption and flattening of the thermal neutron flux in the horizontal direction are achieved.
摘要翻译： 燃料组件具有多个第一燃料棒和多个第二燃料棒，其具有比第一燃料棒在轴向上更短的长度。 第二个燃料棒在其有效的燃料长度部分的整个长度上装有天然铀。 燃料组件具有在上部区域处具有比下部区域的区域更大的水平横截面面积的水杆。 第二燃料棒布置在水杆的上部区域的下方并且靠近水杆的下部区域。 设置水杆下部区域的水平横截面积的宽度，以将位于燃料组件的水平方向上的热中子通量和共振中子通量的最小值定位在相对于位置的外侧 的第二燃料棒在水平方向上。 根据本发明，轴向的H / U比变得接近最佳值，并且实现了热中子通量在水平方向上的共振中子吸收和平坦化的增加。
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