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1. 发明专利

JP2003004884A Boiling water thermal neutron reactor 有权
标题翻译：锅炉水热中和反应器
公开(公告)号：JP2003004884A
公开(公告)日：2003-01-08
申请号：JP2002136432
申请日：2002-05-13
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： MASUMI RYOJI , AOYAMA TADAO , KOYAMA JUNICHI , ISHIBASHI YOKO , YOKOMIZO OSAMU
IPC分类号： G21C5/00 , G21C3/30 , G21C7/26
CPC分类号： Y02E30/39
摘要： PROBLEM TO BE SOLVED: To provide a boiling water thermal neutron reactor capable of increasing shutdown margin and thermal margin and increasing the reactor power per unit core volume.
SOLUTION: The core of the boiling water thermal reactor installed with a plurality of fuel assemblies having water rods in the inside surrounded by a channel box is constituted to have a relation between a total cross sectional area A of non-boiling region including a water gap region formed around the channel box and a region in the water rods and a cross sectional area B of boiling region formed outside the fuel rods and the water rods in the channel box, fulfilling B/(A+B)≥0.75.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种沸水热中子反应堆，其能够增加关闭余量和热裕度，并增加每单位核心体积的反应堆功率。解决方案：安装有多个燃料组件的核心，沸水热反应器由通道箱包围的内部具有水杆的燃料组件构成为具有包括水隙的非沸点区域的总横截面积A之间的关系形成在通道箱周围的区域和水杆中的区域以及形成在燃料棒外部的沸腾区域的横截面积B和通道箱中的水棒，满足B /（A + B）> = 0.75。

2. 发明专利

JP2001116873A FUEL ASSEMBLY 失效
公开(公告)号：JP2001116873A
公开(公告)日：2001-04-27
申请号：JP29762699
申请日：1999-10-20
申请人： HITACHI LTD
发明人： TSUTSUMI NOBURO , NAKAJIMA JUNJIRO , BESSHO TAISUKE , MIZUNO TADASHI , SHIINA KOJI , KANAZAWA TORU , KOYAMA JUNICHI
IPC分类号： G21C3/30
摘要： PROBLEM TO BE SOLVED: To provide a fuel assembly capable of trapping linearly-shaped foreign matter that may flow along flow of coolant, and of fully reducing an increase in pressure losses at a lower tie plate. SOLUTION: The lower tie plate has a foreign matter filter for trapping foreign matter carried by the coolant, the foreign matter filter comprising wire gauze or wire stacked in the direction of flow of the coolant.

3. 发明专利

JP2001099972A INITIAL LOADING CORE OF BOILING WATER REACTOR AND ITS FUEL EXCHANGING METHOD 失效
公开(公告)号：JP2001099972A
公开(公告)日：2001-04-13
申请号：JP27987899
申请日：1999-09-30
申请人： HITACHI LTD
发明人： MASUMI RYOJI , HARAGUCHI HIROKO , HAIKAWA KATSUMASA , KOYAMA JUNICHI
IPC分类号： G21C5/00 , G21C3/326 , G21C3/328 , G21C5/18
摘要： PROBLEM TO BE SOLVED: To secure the thermal allowance and reactor shutdown allowance, and to realize a high power density and a high burn-up simultaneously, in an initial loading core of a boiling water reactor and in its fuel exchanging method. SOLUTION: The average uranium enrichment of low enrichment fuel assemblies 7 loaded in a control cell 11 is about 1.7 wt.% and gadolinia is not added, and the average uranium enrichment of medium enrichment fuel assemblies 8 loaded in the core outermost circumference 21 is about 2.4 wt.% and gadolinia is not added, and the average uranium enrichment of high enrichment fuel assemblies 9 loaded in the other region 31 is 4.4% and gadolinia is added. Hereby, the average enrichment in an initial loading core is 3.6 wt.% or more, and the average enrichment of the low enrichment fuel assemblies 7 loaded in the control cell 11 is 1.8 wt.% or less, and the average enrichment of the medium enrichment fuel assemblies 8 loaded in the core outermost circumference 21 is higher than that of the low enrichment fuel assemblies 7 and is 2.5 wt.% or less, and the low enrichment fuel assemblies 7 and the medium enrichment fuel assemblies 8 have a formation in which a combustible absorbent is not added.

4. 发明专利

JP2000075077A Fuel assembly 有权
标题翻译：燃油总成
公开(公告)号：JP2000075077A
公开(公告)日：2000-03-14
申请号：JP24837098
申请日：1998-09-02
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： YUJI YOKO , KOYAMA JUNICHI , IKEGAWA TOMOHIKO
IPC分类号： G21C3/328
CPC分类号： Y02E30/31 , Y02E30/38
摘要： PROBLEM TO BE SOLVED: To further raise burnup of fuel assembly realizing average takeout burnup of 45 GWd/t by raising fuel assembly enrichment of 5.0 wt.% or less in maximum enrichment without lowering the integrity of uranium fuel rods having burnable absorber inside and by setting uranium enrichment distribution in axial direction. SOLUTION: An assembly is constituted to have maximum pellet enrichment (a) of fuel rods 2 being a
摘要翻译：要解决的问题：为了进一步提高燃料组件的燃耗，通过提高最大浓缩浓度为5.0重量％以下的燃料组合物浓度，实现平均取出燃耗为45兆瓦特/吨，而不会降低内部具有可燃吸收塔的铀燃料棒的完整性设定铀浓缩分布在轴向。解决方案：一个组件被构造成具有最大的颗粒富集（a）燃料棒2为<= 5％，平均燃料组件铀浓缩为4％或更多，并且在铀中添加1％或更多的氧化钆的颗粒是在除了上端和下端之外的具有氧化钆（符号G）的燃料棒2中充满铀浓缩物c

5. 发明专利

JPH1123762A FUEL ASSEMBLY AND INITIAL LOADING REACTOR CORE 失效
公开(公告)号：JPH1123762A
公开(公告)日：1999-01-29
申请号：JP18345297
申请日：1997-07-09
申请人： HITACHI LTD
发明人： YAMANAKA AKIHIRO , HAIKAWA KATSUMASA , YAMASHITA JUNICHI , KOYAMA JUNICHI , KANDA AKIKO
IPC分类号： G21C5/00 , G21C3/328 , G21C3/62
摘要： PROBLEM TO BE SOLVED: To effectively suppress surplus reactivity by increasing the number of fuel rods on the counter channel fastener side as compared with that of fuel rods on the channel fastener side, and making an arrangement in every other row being in parallel diagonally from the top of another diagonal line with the corner position of a next layer as a starting point. SOLUTION: When the inside of a fuel assembly is divided into a control rod side region and an anti-control rod region by a diagonal line A, the number of gadsolinia (Gd) fuel rods is 10 and 2 for an anti-control rod region and a control rod region, respectively. More specifically, eight more fuel rods exist at the anti-control rod region and a channel fastener 7 is installed at a corner closest to a control rod 9 out of four corners of the assembly. By arranging Gd fuel rods closely, neutrons are screened in the Gd fuel rods, thus delaying the combustion of Gd. Therefore, even if the average degree of concentration of the fuel assembly is increased, surplus reactivity can be effectively suppressed by delaying the combustion of Gd fully.

6. 发明专利

JPH10170675A MOX FUEL ASSEMBLY AND CORE OF NUCLEAR REACTOR 失效
公开(公告)号：JPH10170675A
公开(公告)日：1998-06-26
申请号：JP33095596
申请日：1996-12-11
申请人： HITACHI LTD
发明人： SHIMADA HIDEMITSU , KOYAMA JUNICHI , AOYAMA TADAO
IPC分类号： G21C3/30 , G21C3/326 , G21C3/328 , G21C3/62
摘要： PROBLEM TO BE SOLVED: To provide a MOX fuel assembly in which the number of kinds of pellets of burnable-poison-containing fuel rods can be reduced to one while thermal tolerance is maintained. SOLUTION: In a MOX fuel assembly, in which seventy-four MOX fuel rods 3 each filled with mixed oxides of uranium and plutonium and two water rods are arranged in a square gridlike arrangement of nine columns and nine rows, with some of the MOX fuel rods 3 formed into burnable-poison-containing MOX fuel rods 3(C1) and with the water rods 4 placed near the center inside the square gridlike arrangement, the burnable-poison-containing MOX fuel rods 3(C1) are placed in all grid positions (Column I, row (4) to (6);Column IX, row (4) to (6); row (1). Column IV to VI; row (9), Column IV to VI) of the same column or row as the grid positions occupied by the water rods 4, on the four sides (column I, row (1) to (9); Column IX, row (1) to (9); row (1), Column I to IX; row (9), Column I to IX) of the outermost periphery of the square gridlike arrangement.

7. 发明专利

JPH10170674A FUEL ASSEMBLY 失效
公开(公告)号：JPH10170674A
公开(公告)日：1998-06-26
申请号：JP32820096
申请日：1996-12-09
申请人： HITACHI LTD
发明人： IKEGAWA TOMOHIKO , KOYAMA JUNICHI , AOYAMA TADAO
IPC分类号： G21C3/328
摘要： PROBLEM TO BE SOLVED: To reduce a shaft directional output peaking factor while maintaining economical efficiency of fuel by making the average nuclear fission substance concentration of fuel rods on the outermost periphery of a fuel assembly larger than the average nuclear fission substance concentration of fuel rods except for the outermost periphery, and arranging a combustible poison uncontained horizontal cross-sectional structure in the whole area or a part of an upper end part and a lower end part. SOLUTION: A fuel effective part of fuel rods 1 to 7 is composed of an upper end part, a central part and a lower end part, and the upper end part has a length of 1/24 to 2/24 of the total length of the fuel effective part, and the lower end part has a length of 1/24 of the total length of the fuel effective part. It has a horizontal cross-sectional structure that the average nuclear fission substance concentration of the fuel rods 1 to 3 on the outermost periphery of a fuel assembly is smaller than the average nuclear fission substance concentration of the fuel rods 4 to 7 except for the outermost periphery. A combustible poison uncontained horizontal cross-sectional structure that the average nuclear fission substance concentration of the fuel rods 1 to 3 on the outermost periphery is larger than the average nuclear fission substance concentration of the fuel rods 4 to 7 except for the outermost periphery, is provided in the whole area of the upper end part and the lower end part or a part of them.

8. 发明专利

JPH07270561A FUEL ASSEMBLY AND REACTOR CORE 失效
公开(公告)号：JPH07270561A
公开(公告)日：1995-10-20
申请号：JP6241194
申请日：1994-03-31
申请人： HITACHI LTD
发明人： KOYAMA JUNICHI , AOYAMA TADAO , ISHIBASHI YOKO , MOCHIDA TAKAAKI , HAIKAWA KATSUMASA , YAMANAKA AKIHIRO
IPC分类号： G21C5/00 , G21C3/326 , G21C3/328 , G21C3/62
摘要： PURPOSE:To provide a fuel assembly and a reactor core in which an initial loading core of high degree of burn-up excellent in the operability can be achieved by suppressing the excess reaction even if the average enrichment of core is increased. CONSTITUTION:The fuel assembly comprises fuel rods 1 arranged in a square grid-shape of 9 rows and 9 columns and fuel rods 2 containing a combustible toxic substance, i.e., gadolinia, wherein two thick water rods 3 are disposed at the position of seven central grids. Ten out of twelve fuel rods 2 containing gadolinia do not touch the water rods 3 at all and do not touch, in more than one direction, the outermost and second outermost fuel rod grids at the corner part thereof. Only two fuel rods 2 containing gadolinia are located at the position where one of eight peripheral grids includes the water rod region.

9. 发明专利

JPH07209459A FUEL ASSEMBLY, NUCLEAR REACTOR CORE, AND OPERATING METHOD OF BOILING WATER REACTOR 失效
公开(公告)号：JPH07209459A
公开(公告)日：1995-08-11
申请号：JP106094
申请日：1994-01-11
申请人： HITACHI LTD
发明人： KOYAMA JUNICHI , AOYAMA TADAO , ISHIBASHI YOKO
IPC分类号： G21C5/12 , G21C3/322 , G21C3/326 , G21C3/328
摘要： PURPOSE:To provide a fuel assembly which can prevent an increase in pressure loss without deteriorating thermal margin, and enhance the core heat output reducing effect, when the flow rate is reduced, to further improve the stability enhancing func tion of the core. CONSTITUTION:A spectral shift rod 1 has a coolant ascending passage 9 having a coolant inlet port 8 to carry a coolant upward, and a coolant descending passage 10 having a coolant outlet port 4 and connected to the coolant ascending passage 9 to carry the coolant downward. The upper end 3 of the coolant ascending passage 9 has the same height as the effective length upper end of an average fuel rod 12, and the lower end of the coolant outlet port 4 is situated on the 2nd node, which is higher than the effective length lower end of the average fuel rod 12. The coolant ascending passage 9 and the coolant descending passage 10 have an uniform horizontal sectional area between the upper end 3 (24th node) and the lower end of the coolant outlet 4 (second node 2). In the average fuel rod 12, the fissionable material concentration eH from the middle point (13th node) between the upper end 3 and the coolant outlet 4 lower end to the 24th node is 4.6wt.%, and the fissionable material concentration eL from the 13th node to the 2nd node is higher than 4.4wt.%.

10. 发明专利

JPH07120577A FUEL ASSEMBLY 失效
公开(公告)号：JPH07120577A
公开(公告)日：1995-05-12
申请号：JP26455093
申请日：1993-10-22
申请人： HITACHI LTD
发明人： ISHIBASHI YOKO , AOYAMA TADAO , KOYAMA JUNICHI
IPC分类号： G21C3/328 , G21C3/326 , G21C3/62
摘要： PURPOSE:To enhance fuel economy by setting the average concentration of combustible toxicants in fuel rod to be arranged in a region contiguous to a moderator rod higher than that in the region other than the outermost layer facing a channel box and the corner parts of second outer layer. CONSTITUTION:The average concentration of combustible toxicants in a first group fuel rods 4 arranged contiguously to a thick water rod 2 arranged in the center of a fuel assembly is set higher than that of a second group fuel rods 5 arranged in the region other than the region contiguous to a channel box 1 and the corner parts of inner layer. The hatched region 6 represents a region contiguous to a water rod 2 where the thermal neutron flux is high and the hatched region 7 represents a region where the thermal neutron flux is relatively low. Since the combustible toxicants in the region 7 are substantially burnt up simultaneously with those in the region 6, the reactivity is improved resulting in the enhancement of economy.

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