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11. 发明授权

US5207979A Nuclear fuel assemblies and reactor cores including them 失效
标题翻译：核燃料组件和反应堆核心，包括它们
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。

12. 发明授权

US5349619A Fuel assembly for light water reactor and light water reactor core 失效
标题翻译：轻水反应堆和轻水反应堆核心的燃料组件
公开(公告)号：US5349619A
公开(公告)日：1994-09-20
申请号：US64638
申请日：1993-05-21
申请人： Takaaki Mochida , Motoo Aoyama
发明人： Takaaki Mochida , Motoo Aoyama
IPC分类号： G21C3/322 , G21C3/328 , G21C3/32
CPC分类号： G21C3/328 , G21C3/322 , G21C2003/3225 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly for a light water reactor comprising a plurality of fuel rods which contain plutonium as a primary fissile material when exposure is zero, and a light water reactor including such fuel assemblies. The fuel assembly has a structure in which at least one of moderator rods is provided at least in one of each corner portion of an arrangement of the fuel rods and a position adjacent to the corner portion in such a manner that the moderator rods are located in rotation symmetry, each of the moderator rods being filled with water or a solid coolant over a length at least corresponding to a fuel effective length, and the fuel rods are provided at positions in the second layer from the outermost periphery which are adjacent to those positions at which the moderator rods are located.
摘要翻译：一种用于轻水反应器的燃料组件，包括当暴露为零时包含钚作为主要裂变材料的多个燃料棒，以及包括这种燃料组件的轻水反应堆。燃料组件具有这样的结构，其中至少一个减速杆设置在燃料棒的布置的每个角部的至少一个中，并且以与角部相邻的位置设置，使得调节杆位于旋转对称，每个减速杆在至少对应于燃料有效长度的长度上填充有水或固体冷却剂，并且燃料棒设置在第二层中与最靠近这些位置的最外周的位置调音杆位于该位置。

13. 发明授权

US5093070A Core loading strategy 失效
标题翻译：核心加载策略
公开(公告)号：US5093070A
公开(公告)日：1992-03-03
申请号：US448209
申请日：1989-12-08
申请人： Junichi Koyama , Motoo Aoyama , Akinobu Nakajima , Hiromi Maruyama
发明人： Junichi Koyama , Motoo Aoyama , Akinobu Nakajima , Hiromi Maruyama
IPC分类号： G21C5/00 , G21C5/18 , G21C7/00 , G21C19/20
CPC分类号： G21C19/205 , G21C7/00 , G21Y2002/201 , G21Y2004/10 , G21Y2004/40 , Y02E30/31 , Y02E30/39
摘要： A core of boiling water reactor is divided into a central region and a peripheral region surrounding it in the radial direction thereof. The loading fraction of new first fuel assemblies containing burnable poison and loaded in the central region is greater than the loading fraction of the new first fuel assemblies loaded in the peripheral region. The loading fraction of second fuel assemblies loaded in the central region of the core and operating in a second operation cycle is smaller than the loading fraction of the second fuel assemblies loaded in the peripheral region of the core and operating in the second operation cycle. The second fuel assemblies contain no burnable poison. In such a core, the reactivity of the peripheral region is greater than that of the central region in the beginning of an operation cycle. Contrary, the reactivity of the central region is greater than that of the peripheral region in the end of an operation cycle.
摘要翻译：沸水反应器的核心沿径向方向被分为中心区域和围绕它的周边区域。包含可燃毒物并装载在中心区域的新的第一燃料组件的负载分数大于装载在周边区域中的新的第一燃料组件的负载分数。负载在芯的中心区域并在第二操作循环中操作的第二燃料组件的负载分数小于装载在铁芯的周边区域并在第二操作循环中操作的第二燃料组件的负载分数。第二燃料组件不含可燃毒物。在这样的核心中，在操作周期开始时，周边区域的反应性大于中心区域的反应性。相反，在操作周期结束时，中心区域的反应性大于外围区域的反应性。

14. 发明授权

US5519739A Boiling water type thermal neutron reactor and its operating method 失效
标题翻译：沸水型热中子反应堆及其操作方法
公开(公告)号：US5519739A
公开(公告)日：1996-05-21
申请号：US297040
申请日：1994-08-29
申请人： Ryoji Masumi , Motoo Aoyama , Junichi Koyama , Yoko Ishibashi , Osamu Yokomizo
发明人： Ryoji Masumi , Motoo Aoyama , Junichi Koyama , Yoko Ishibashi , Osamu Yokomizo
IPC分类号： G21C1/08 , G21C7/32
CPC分类号： G21C7/32 , G21C1/084 , G21Y2002/201 , G21Y2004/30 , G21Y2004/403 , Y02E30/31 , Y02E30/39
摘要： The reactor shut-down margin and the thermal margin, as well as the output per unit volume of the core is increased. When A is the total cross sectional area of the non-boiling water areas in the channel boxes each surrounding a fuel assembly and non-boiling water areas outside the channel boxes and B is the cross sectional areas of boiling water areas in the channel boxes, the relation of 1>B/(A+B).gtoreq.0.76 is set. A control unit adjusts a rotational speed of a recirculation internal pump which controls the cooling water flow rate per unit area in the core section to 3.0.times.10.sup.3 t/h/m.sup.2 at the beginning of the operation cycle and controls the cooling water flow rate per the unit area in the core cross section to 3.3.times.10.sup.3 t/h/m.sup.2 at the end of an operation cycle.
摘要翻译：反应堆停机余量和热裕量以及核心单位体积的输出增加。当A是每个围绕燃料组件的通道箱中的非沸水区域的总横截面积和通道箱外面的非沸水区域，而B是通道箱中沸水区域的横截面积时，设置1> B /（A + B）> / = 0.76的关系。控制单元调节再循环内部泵的转速，其在操作周期开始时将芯部中的每单位面积的冷却水流量控制为3.0×10 3 t / h / m 2，并控制每单位的冷却水流量核心横截面积在运行周期结束时为3.3×103t / h / m2。

15. 发明授权

US5008070A Fuel assembly 失效
标题翻译：燃油组件
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.

16. 发明授权

US4914678A Reactor core in a nuclear reactor and initial core in a nuclear reactor 失效
标题翻译：核反应堆中的核心和核反应堆中的初始核心
公开(公告)号：US4914678A
公开(公告)日：1990-04-03
申请号：US230171
申请日：1988-08-09
申请人： Junichi Koyama , Motoo Aoyama
发明人： Junichi Koyama , Motoo Aoyama
IPC分类号： G21C5/18 , G21C3/328 , G21C5/02
CPC分类号： G21C5/02 , Y02E30/40
摘要： The reactor core is divided into a central region and a surrounding outer region in the radial direction. First fresh fuel unirradiated assemblies newly loaded onto the outer region contain a fissible material in amounts less than that of the fissible material of second fresh unirradiated fuel assemblies newly loaded onto the central region. If the amount of the fissible material in the upper region of the first fuel assembly is denoted by a, the amount of the fissible material in the lower region of the first fuel assembly by b, the amount of the fissible material in the upper region of the second fuel assembly by c, and the amount of the fissible material in the lower region of the second fuel assembly by d, then a relationship a/b
摘要翻译：反应堆芯在径向上被分成中心区域和周围的外部区域。新加载到外部区域的新鲜燃料未照射组件含有少于新装载到中央区域的第二新鲜未照射燃料组件的容许材料的容许材料。如果在第一燃料组件的上部区域中的容许材料的量由a表示，则第一燃料组件的下部区域中的容许材料的量由b表示，上部区域中的容许材料的量第二燃料组件通过c和第二燃料组件的下部区域中的可容许材料的数量乘以d，则满足关系a / b

17. 发明授权

US5202085A Fuel assembly and reactor core 失效
标题翻译：燃料组件和反应堆堆芯
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
IPC分类号： G21C3/326 , G21C3/328
CPC分类号： G21C3/328 , Y02E30/38
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。

18. 发明授权

US4926450A Fuel assembly 失效
标题翻译：燃油组件
公开(公告)号：US4926450A
公开(公告)日：1990-05-15
申请号：US171452
申请日：1988-03-21
申请人： Yasuhiro Masuhara , Soamu Yokomizo , Kotaro Inoue , Sadao Uchikawa , Motoo Aoyama , Junichi Yamashita , Yuichiro Yoshimoto , Tetsuo Yasuda , Hiromasa Hirakawa
发明人： Yasuhiro Masuhara , Soamu Yokomizo , Kotaro Inoue , Sadao Uchikawa , Motoo Aoyama , Junichi Yamashita , Yuichiro Yoshimoto , Tetsuo Yasuda , Hiromasa Hirakawa
IPC分类号： G21C3/326 , G21C3/322 , G21C3/328
CPC分类号： G21C3/322 , G21C2003/3225 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly including a plurality of fuel rods and water rods. The fuel rods are arranged with a predetermined pitch and two water rods are disposed adjacent to each other in a diagonal direction of the fuel assembly. More particularly, the fuel rods are arranged in a lattice of nine rows by nine columns and the two water rods are disposed inside a region corresponding to a space sufficient for disposing seven fuel rods at the center of the fuel assembly. Each of the water rods has an outer diameter greater than the pitch of the fuel rods.

19. 发明授权

US5432829A Fuel assembly and reactor core 失效
标题翻译：燃料组件和反应堆堆芯
公开(公告)号：US5432829A
公开(公告)日：1995-07-11
申请号：US996774
申请日：1992-12-23
申请人： Motoo Aoyama , Taro Ueki , Akinobu Nakajima , Yoko Ishibashi , Kunitoshi Kurihara , Osamu Yokomizo , Yasuhiro Masuhara , Junichi Yamashita , Yasunori Bessho , Junjiro Nakajima
发明人： Motoo Aoyama , Taro Ueki , Akinobu Nakajima , Yoko Ishibashi , Kunitoshi Kurihara , Osamu Yokomizo , Yasuhiro Masuhara , Junichi Yamashita , Yasunori Bessho , Junjiro Nakajima
IPC分类号： G21C3/326 , G21C3/328 , G21C3/32
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A fuel assembly comprises fuel rods arrayed in a square lattice pattern of 10 rows and 10 columns, and three large-diameter water rods arranged along a diagonal line of the fuel assembly in such a region as able to accommodate 10 fuel rods. Partial length fuel rods are arranged in an outermost layer of the fuel rod array at fuel rod setting positions other than corners of the outermost layer. Ordinary fuel rods are arranged in a layer inside the outermost layer and adjacent to the outermost layer at positions adjacent to the partial length fuel rods in the outermost layer.The struction of the fuel assembly enables a reduction in the void coefficient and an improvement in the reactivity control capability. Also, the void coefficient can be reduced without lowering reactivity, and fuel economy is improved.
摘要翻译：燃料组件包括排列成10行10列的正方形格子图案的燃料棒和沿着能够容纳10个燃料棒的区域沿着燃料组件的对角线布置的三个大直径水棒。部分长度的燃料棒布置在燃料棒阵列的最外层的燃料棒设置位置，而不是最外层的角。普通燃料棒布置在最外层内的层中，并且与最外层中的部分长度燃料棒相邻的位置处邻近最外层。燃料组件的结构能够减小空隙系数并提高反应性控制能力。而且，可以降低空隙系数而不降低反应性，并且提高燃料经济性。

20. 发明授权

US5383229A Fuel assembly and reactor core 失效
标题翻译：燃料组件和反应堆堆芯
公开(公告)号：US5383229A
公开(公告)日：1995-01-17
申请号：US879
申请日：1993-01-05
申请人： Akinobu Nakajima , Yoko Ishibashi , Motoo Aoyama , Kunitoshi Kurihara , Junichi Yamashita , Junjiro Nakajima , Koji Nishida
发明人： Akinobu Nakajima , Yoko Ishibashi , Motoo Aoyama , Kunitoshi Kurihara , Junichi Yamashita , Junjiro Nakajima , Koji Nishida
IPC分类号： G21C3/328 , G21C3/32
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/38
摘要： A second fuel rod positioned at each corner of a channel box and second fuel rods adjacent to the former are formed to have a smaller outer diameter than that of ordinary first fuel rods, so that a pitch between the second fuel rods is narrower than a pitch between the first fuel rods. Making the outer diameter of the second fuel rods smaller than that of the first fuel rods reduces the power per unit length of the second fuel rods. The narrower pitch between the second fuel rods than the pitch between the first fuel rods provides two effects. First, a unit lattice cell becomes so small as to avoid an increase in the H/U ratio. Secondly, a new moderator region is formed between the second fuel rods and the first fuel rods adjacent thereto, the moderator region acting to intensify thermal neutron flux around those first fuel rods. These two effects enable a further reduction in the power per unit length of the second fuel rods. As a result, a fuel assembly intended for higher burn-up can be realized by increasing enrichment, while suppressing an increase in the local power peaking factor at corners of the fuel assembly.
摘要翻译：定位在通道箱的每个角落处的第二燃料棒和与前者相邻的第二燃料棒形成为具有比普通的第一燃料棒小的外径，使得第二燃料棒之间的间距比间距窄在第一燃料棒之间。使得第二燃料棒的外径小于第一燃料棒的外径减小了第二燃料棒的每单位长度的功率。第二燃料棒之间的间距窄于第一燃料棒之间的间距，提供了两个效果。首先，单位晶胞变得如此小以避免H / U比的增加。其次，在第二燃料棒和与其相邻的第一燃料棒之间形成新的慢化剂区域，该慢化剂区域用于加强围绕这些第一燃料棒的热中子通量。这两个效果使得能够进一步降低第二燃料棒的每单位长度的功率。结果，可以通过增加浓缩来实现用于更高燃耗的燃料组件，同时抑制燃料组件的角落处的局部功率峰值因数的增加。

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