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    Core of light water reactor and fuel assembly
    12.
    发明授权
    Core of light water reactor and fuel assembly 有权
    轻水反应堆和燃料组件的核心

    公开(公告)号：US09047994B2

    公开(公告)日：2015-06-02

    申请号：US12978198

    申请日：2010-12-23

    申请人： Renzo Takeda ,  Junichi Miwa ,  Kumiaki Moriya

    发明人： Renzo Takeda ,  Junichi Miwa ,  Kumiaki Moriya

    IPC分类号： G21C1/04 ,  G21C19/44 ,  G21C3/328 ,  G21C5/00

    CPC分类号： G21C3/328 ,  G21C1/084 ,  G21C3/42 ,  G21C5/00 ,  G21C5/02 ,  G21C19/44 ,  Y02E30/38 ,  Y02W30/882

    摘要： A core of a light water reactor has a plurality of fuel assemblies. The fuel assemblies include a plurality of fuel rods in which a lower end is supported by a lower tie-plate and an upper end is supported by an upper tie-plate. The fuel rods form plenums above a nuclear fuel material zone and have a neutron absorbing material filling zone under the nuclear fuel material zone. Neutron absorbing members attached to the upper tie-plate are disposed between mutual plenums of the neighboring fuel rods above the nuclear fuel material zone. The neutron absorbing members have a length of 500 mm and are positioned at a distance of 300 mm from the nuclear fuel material zone. Even if the overall core is assumed to become a state of 100% void, no positive reactivity is inserted to the core.

    摘要翻译： 轻水反应堆的核心具有多个燃料组件。 燃料组件包括多个燃料棒，其中下端由下连接板支撑，上端由上连接板支撑。 燃料棒在核燃料材料区之上形成集气室，并在核燃料材料区下方具有中子吸收材料填充区。 附接到上连接板的中子吸收构件设置在核燃料材料区域上方的相邻燃料棒的相互增压室之间。 中子吸收构件具有500mm的长度并且位于与核燃料材料区300mm的距离处。 即使假设整个核心成为100％空白的状态，也不会向核心插入积极的反应性。

    Core of a Boiling Water Reactor
    13.
    发明申请
    Core of a Boiling Water Reactor 审中-公开
    沸水堆的核心

    公开(公告)号：US20090196391A1

    公开(公告)日：2009-08-06

    申请号：US12026634

    申请日：2008-02-06

    申请人： Junichi Miwa ,  Renzo Takeda ,  Takeshi Mitsuyasu ,  Kumiaki Moriya

    发明人： Junichi Miwa ,  Renzo Takeda ,  Takeshi Mitsuyasu ,  Kumiaki Moriya

    IPC分类号： G21C19/28

    CPC分类号： G21C3/326 ,  G21C5/00 ,  Y02E30/31 ,  Y02E30/38

    摘要： A core of a boiling water reactor as a burner type core of the boiling water reactor having a ratio of 3 or more of number of fuel assemblies loaded in the core to number of control rods installed in the nuclear reactor and using an oxide of low enriched uranium having a mean enrichment of the fuel assemblies of 3 wt % to 8 wt % or a mixed oxide having a mean fissile plutonium enrichment of the fuel assemblies of 2 wt % to less than 7 wt %,wherein a mean weight of at least one of uranium and plutonium included in a unit volume of a core region is 2.25 to 3.4 kg/l when load of the fuel assemblies having a burnup of 0 into the core is finished, anda mean thickness of the channel box of the fuel assemblies is 2.10 to 3.55 mm.

    摘要翻译： 作为沸水反应器的燃烧器型核心的沸水反应堆的核心，其中装载在核心中的燃料组件的数量与安装在核反应堆中的控制棒的数量的比例为3以上，并且使用低浓度的氧化物 具有3重量％至8重量％的燃料组件的平均富集的铀或燃料组件的平均裂变钚富集浓度为2重量％至小于7重量％的混合氧化物，其中平均重量为至少一个 包含在核心区域的单位体积中的铀和钚的总量为2.25至3.4kg / l，当燃料组件的燃料组件的负荷为零时，完成燃料组件的通道箱的平均厚度为 2.10到3.55毫米。

    Fuel assembly and reactor core
    15.
    发明授权
    Fuel assembly and reactor core 失效
    燃料组件和反应堆堆芯

    公开(公告)号：US4871510A

    公开(公告)日：1989-10-03

    申请号：US178902

    申请日：1988-04-07

    申请人： Motoo Aoyama ,  Renzo Takeda

    发明人： Motoo Aoyama ,  Renzo Takeda

    IPC分类号： G21C3/328 ,  G21C3/322 ,  G21C3/324

    CPC分类号： G21C3/324 ,  G21C3/322 ,  Y02E30/38

    摘要： A fuel assembly of the present invention comprises fuel rods which are arranged in 9 rows and 9 columns (9.times.9) in a channel box. The channel box has a width L between outer walls thereof and a width D between inner walls thereof, both of which satisfy the following equation:0.12.ltoreq.(P-L)/Dwherein P denotes the fuel assembly pitch in a reactor core. A sufficient cold shutdown margin for a reactor core can be secured by determining the widths L and D so as to satisfy the above-described equation, even if the average enrichment of the fuel assembly is increased to 4 wt % or more.

    摘要翻译： 本发明的燃料组件包括在通道箱中布置成9列和9列（9x9）的燃料棒。 通道箱在其外壁之间具有宽度L和其内壁之间的宽度D，两者都满足以下等式：0.12 <=（P-L）/ D其中P表示反应堆芯中的燃料组件间距。 即使燃料组件的平均富集度提高到4重量％以上，也可以通过确定宽度L和D以满足上述等式来确保反应堆堆芯的足够的冷关闭裕度。

    Light water moderation type nuclear reactor
    16.
    发明授权
    Light water moderation type nuclear reactor 失效
    轻水缓和型核反应堆

    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

    IPC分类号： G21C5/12 ,  G21C1/08 ,  G21C3/328 ,  G21C5/00 ,  G21C5/18

    CPC分类号： G21C5/18 ,  Y02E30/40

    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。

    Boiling water type nuclear reactor
    17.
    发明授权
    Boiling water type nuclear reactor 失效
    沸水型核反应堆

    公开(公告)号：US4292128A

    公开(公告)日：1981-09-29

    申请号：US942558

    申请日：1978-09-15

    申请人： Renzo Takeda ,  Kunitoshi Kurihara ,  Sadao Uchikawa

    发明人： Renzo Takeda ,  Kunitoshi Kurihara ,  Sadao Uchikawa

    IPC分类号： G21C7/26 ,  G21C7/02 ,  G21C7/32 ,  G21C7/00

    CPC分类号： G21C7/02 ,  G21Y2002/201 ,  G21Y2004/10 ,  G21Y2004/302 ,  G21Y2004/40 ,  Y02E30/39

    摘要： A boiling water type nuclear reactor adapted to be operated at a void quality (weight ratio of vapor in the coolant) of coolant at the core outlet of 17% or higher. By adopting this level of void quality, a void quality exceeding 8.5% is available at least in the upper half region of the core which in turn provides a void fraction of 66% or higher. Consequently, it is possible to reduce the enrichment of the fuel, so as to allow a more efficient use of the fuel. At the same time, due to the reduced power generating rate, the range over which the flow rate of coolant is controlled is widened, so that it becomes possible to change the reactivity solely by controlling the flow rate of the coolant. It is therefore possible to operate the reactor over whole operation cycle with its control rods fully withdrawn.

    摘要翻译： 一种沸水型核反应堆，适于在核心出口处的冷却剂的空隙质量（冷却剂中的蒸汽的重量比）为17％或更高的温度下操作。 通过采用该水平的空隙质量，至少在芯的上半部区域可以获得超过8.5％的空隙质量，这又提供66％或更高的空隙率。 因此，可以减少燃料的浓缩，从而更有效地利用燃料。 同时，由于发电率降低，控制冷却剂流量的范围扩大，从而可以通过控制冷却剂的流量来改变反应性。 因此，可以在整个操作周期内操作反应器，其控制棒完全拉出。

    Light water reactor core and fuel assembly
    18.
    发明授权
    Light water reactor core and fuel assembly 有权
    轻水反应堆核心和燃料组件

    公开(公告)号：US06512805B1

    公开(公告)日：2003-01-28

    申请号：US09660356

    申请日：2000-09-12

    申请人： Renzo Takeda ,  Motoo Aoyama ,  Junichi Miwa ,  Motohiko Ikegawa

    发明人： Renzo Takeda ,  Motoo Aoyama ,  Junichi Miwa ,  Motohiko Ikegawa

    IPC分类号： G21C104

    CPC分类号： G21C3/32 ,  G21C1/08 ,  G21C3/326 ,  G21C5/02 ,  G21C7/117 ,  Y02E30/31 ,  Y02E30/38

    摘要： There are provided a light water reactor core which has the same levels in cost efficiency and degree of safety as those of an existing BWR under operation now, that is, which is oriented to plutonium multi-recycle having a breeding ratio near 1.0 or slightly larger and having a negative void coefficient with minimizing modification of the reactor core structure of the existing BWR under operation now, and to fuel assemblies used for the boiling water reactor. The light water reactor core having an effective water-to-fuel volume ratio of 0.1 to 0.6 is formed by combining closed compact lattice fuel assemblies each composed of fuel rods having fuel which is enriched by adding plutonium or plutonium and an actinide to a uranium containing at least one of a depleted uranium, natural uranium, a degraded uranium and a low enriched uranium; high void fraction coolant of 45% to 70%; and large-diameter control rods to be inserted into the fuel assemblies, the large-diameter control rod comprising at least one absorption rod having a transverse cross-sectional area larger than a cross-sectional area of a unit lattice cell of the fuel rod.

    摘要翻译： 提供了一种轻水反应堆核心，其成本效益和安全程度与目前运行的现有BWR相同，即面向钚多循环的育种率接近1.0或稍大 并且具有负空隙系数，同时使现有的BWR的反应堆堆芯结构的现有修改最小化，以及用于沸水反应器的燃料组件。 具有有效的水与燃料体积比为0.1至0.6的轻水反应堆核心是通过组合封闭的紧凑格子燃料组合而形成的，每个燃料组合物由具有通过将钚或钚加入的铀和锕系元素富集的燃料的燃料棒组成， 铀，天然铀，退化铀和低浓铀中的至少一种; 45％至70％的高空隙率冷却液; 和大直径控制杆插入到燃料组件中，所述大直径控制杆包括至少一个吸收杆，所述至少一个吸收杆的横截面面积大于所述燃料棒的单元晶格单元的横截面面积。

    Reactor core for a light water cooled reactor, fuel assembly and control rod
    19.
    发明授权
    Reactor core for a light water cooled reactor, fuel assembly and control rod 失效
    反应堆核心为轻水冷却反应堆，燃料组件和控制棒

    公开(公告)号：US5940461A

    公开(公告)日：1999-08-17

    申请号：US70246

    申请日：1998-05-01

    申请人： Renzo Takeda ,  Motoo Aoyama ,  Masanao Moriwaki

    发明人： Renzo Takeda ,  Motoo Aoyama ,  Masanao Moriwaki

    IPC分类号： G21C5/20 ,  G21C1/00 ,  G21C1/08 ,  G21C3/00 ,  G21C3/328 ,  G21C3/62 ,  G21C7/10 ,  G21C7/113 ,  G21C7/117 ,  G21C1/04

    CPC分类号： G21C1/084 ,  G21C1/00 ,  G21C3/00 ,  G21C7/113 ,  G21Y2002/201 ,  G21Y2002/601 ,  G21Y2004/101 ,  G21Y2004/30 ,  G21Y2004/60 ,  Y02E30/31 ,  Y02E30/39

    摘要： To provide a reactor core for light water cooled reactor, a fuel assembly and a control rod intended for Pu multi-recycling at a breeding ratio of about 1.0, or 1.0 or more while keeping the economical or safety performance to the same level as in BWR now under operation, that is, while minimizing the change for the incore structures and maintaining the void coefficient negative. A reactor core for a light water cooled reactor having an effective fuel-to-water volume ratio of 0.1 to 0.6 by the combination of a dense lattice fuel assembly constituted of fuel rods formed by adding Pu to degraded uranium, natural uranium, depleted uranium or low concentrated uranium, coolants at high void fraction of 45% to 70% and a cluster-type, Y-type or cruciform control rod.

    摘要翻译： 为了提供轻水冷却反应堆的反应堆堆芯，燃料组件和控制棒，用于以约1.0或1.0或更多的育种比率进行Pu多重循环，同时将经济或安全性能保持在与BWR相同的水平 现在正在运行，即尽可能减少腋窝结构的变化并保持空白系数为负。 一种用于轻水冷却反应器的反应堆堆芯，其由燃料棒组合而成的密集晶格燃料组合组合，其有效燃料与水的体积比为0.1至0.6，所述燃料棒通过将Pu添加到退化的铀，天然铀，贫化铀或 低浓度铀，高孔隙率为45％至70％的冷却剂和簇型Y型或十字形控制棒。