专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5377247A Fuel assembly of nuclear reactor 失效
标题翻译：燃料组装核反应堆
公开(公告)号：US5377247A
公开(公告)日：1994-12-27
申请号：US42443
申请日：1993-02-19
申请人： Ritsuo Yoshioka , Takeshi Seino , Toru Yamamoto , Yasushi Hirano
发明人： Ritsuo Yoshioka , Takeshi Seino , Toru Yamamoto , Yasushi Hirano
IPC分类号： G21C3/326 , G21C3/328 , G21C3/62 , G21C5/02 , G21C5/18 , G21C7/06
CPC分类号： G21C5/02 , G21C3/328 , Y02E30/38
摘要： A nuclear reactor core is provided with a fuel assembly which comprises channel boxes respectively separated with spaces into which control rods are arranged and a plurality of fuel rods arranged in the channel box, at least a part of the fuel rods being charged with uranium-plutonium mixture fuel and an enrichment of U-235 or a concentration of plutonium, or both being distributed in an axial direction of the fuel rods. The concentration of a burnable poison packed in the fuel rod is distributed in the axial direction of the fuel assembly. The ratio of the occupying region of a moderator of the fuel assembly is increased with respect to the fuel occupying region. The number of the fuel rods containing the burnable poison is variously changed with respect to the total number of the fuel rods and the arranging mode thereof is also varied with the concentration thereof.
摘要翻译：核反应堆堆芯设置有燃料组件，燃料组件包括分别与设置有控制棒的空间分开的通道箱和布置在通道箱中的多个燃料棒，至少一部分燃料棒装有铀 - 钚混合燃料和U-235的浓缩或浓度的钚，或两者分布在燃料棒的轴向方向上。装在燃料棒中的可燃毒物的浓度分布在燃料组件的轴向上。燃料组件的调节剂的占据区域的比例相对于燃料占据区域增加。含有可燃毒物的燃料棒的数量相对于燃料棒的总数而有各种变化，其排列方式也随其浓度而变化。

2. 发明授权

US5367547A Fuel assembly for boiling water reactor and core 失效
标题翻译：用于沸水反应堆和核心的燃料组件
公开(公告)号：US5367547A
公开(公告)日：1994-11-22
申请号：US79527
申请日：1993-06-22
申请人： Kazuki Hida , Yasushi Hirano , Koji Hirukawa , Tsuyoshi Nakajima
发明人： Kazuki Hida , Yasushi Hirano , Koji Hirukawa , Tsuyoshi Nakajima
IPC分类号： G21C3/328 , G21C3/32
CPC分类号： G21C3/328 , G21Y2002/201 , G21Y2004/30 , Y02E30/31 , Y02E30/38
摘要： A fuel assembly for a boiling water reactor comprising an upper and lower tie plates, a plurality of fuel rods filled therein with a plurality of fuel pellets, a fuel bundle comprising the fuel rods retained with a plurality of spacers in spaced relation and disposed between the upper and lower tie plates, and a polygonal tube-like channel box which encloses the fuel bundle and constitutes flow paths for coolant. The fuel rods comprise long fuel rods and short fuel rods which are each shorter in the effective portion than each of the long fuel rods. The concentration of fissile material in each of the short fuel rods is lower than the mean concentration of fissile material in the cross section of the fuel bundle. In the case the fuel bundle is vertically subdivided into two regions, an upper and lower one, with the upper end of the effective portion of each of the short fuel rods as a border, the mean concentration of fissile material in the cross section of the fuel bundle in the region lower than the border is lower than that in the cross section of the fuel bundle in the region above the border.
摘要翻译：一种用于沸水反应器的燃料组件，包括上和下连接板，多个燃料棒，其中填充有多个燃料颗粒，燃料束，包括燃料棒，所述燃料棒具有间隔开的多个间隔件并且设置在所述燃料棒之间上下连接板和封闭燃料束的多边形管状通道箱，并构成冷却剂的流动路径。燃料棒包括长燃料棒和短燃料棒，其有效部分比每个长燃料棒短。每个短燃料棒中的易裂变材料的浓度低于燃料束截面中易裂变材料的平均浓度。在燃料束垂直分为两个区域的情况下，上，下一个，短燃料棒的有效部分的上端作为边界，在该截面中的裂变材料的平均浓度在低于边界的区域中的燃料束比在边界上方的燃料束的横截面中低。

3. 发明授权

US06445759B1 Fuel assembly and nuclear reactor 失效
标题翻译：燃料装配和核反应堆
公开(公告)号：US06445759B1
公开(公告)日：2002-09-03
申请号：US09689789
申请日：2000-10-13
申请人： Kouji Hiraiwa , Yamato Hayashi , Yasushi Hirano , Jun Saeki , Kazuki Hida , Junko Watanabe
发明人： Kouji Hiraiwa , Yamato Hayashi , Yasushi Hirano , Jun Saeki , Kazuki Hida , Junko Watanabe
IPC分类号： G21C300
CPC分类号： G21C7/04 , G21C3/326 , G21Y2002/201 , G21Y2004/10 , G21Y2004/30 , Y02E30/38 , Y02E30/39
摘要： A fuel assembly comprises a plurality of fuel rods bundled in grid pattern, a part of the fuel rods containing gadolinium as a burnable poison. At least one of the fuel rod having gadolinium contains gadolinium enriched in at least one kind of isotope of odd mass number more than an isotopic abundance of natural gadolinium. In the enriched gadolinium, a ratio of a content of Gd-155 to that of Gd-157 is 0.1 or less. An average concentration (wt %) G0 of enriched gadolinia is, with M denoting the number of month under rated power operation per one cycle of an equilibrium core, P power density of a nuclear reactor (kw/l unit) and W a sum of isotopic composition, is set in the range shown by the following expression. G0
摘要翻译：燃料组件包括多个以栅格图案捆扎的燃料棒，燃料棒的一部分包含钆作为可燃毒物。具有钆的燃料棒中的至少一个含有富含至少一种比天然钆的同位素丰度高的奇数质量的至少一种同位素的钆。在富集的钆中，Gd-155与Gd-157的含有率为0.1以下。富氧钆的平均浓度（wt％）G0，M表示平衡核心每一个循环的额定功率运行下的月数，核反应堆的功率密度（kw / l单位）和W是同位素组成设定在由下式表示的范围内。因此，在燃料组件中，可以减少循环端的可燃毒物的残留反应性，并且可以提高热性能。在燃料组件的另一方面，a 设置在控制杆侧的区域中的钆氧燃料棒包含富含奇数质量数超过天然同位素丰度的同位素的钆。富集钆的浓度设定为例如天然钆的一半以下。因此，氧化钆燃料棒中的易裂变材料（铀）的富集可以大于现有的燃料组件中的裂变材料（铀）的浓缩，钚的平均浓度增加。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式