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1. 发明专利

DE4014861A1 未知
公开(公告)号：DE4014861A1
公开(公告)日：1990-12-20
申请号：DE4014861
申请日：1990-05-09
申请人： TOSHIBA KAWASAKI KK , HITACHI LTD , GEN ELECTRIC
发明人： OGIYA SHUNSUKE , YAMAMOTO TORU , HAIKAWA KATSUMASA , NISHIMURA AKIRA
IPC分类号： G21C3/328 , G21C3/30 , G21C3/326 , G21C5/00
摘要： A fuel assembly of the type having a plurality of a fuel material characterized in that a water rod disposed in a channel has a large diameter so that it has a space into which a plurality of fuel rods could be loaded and liquid water boil flows through the water rod and which has a section filled with a fuel material comprising a natural uranium section defined at least one of the upper and lower ends of each fuel rod and an enriched uranium section comprising the uppermost, intermediate and lowermost sections each having a different degree of average enrichment across a cross section of the fuel assembly and the upper and lowermost sections have the degree of enrichment across a section of the fuel assembly is lower than that of the intermediate section, and the enriched uranium section has two sections each of which has a different content of a burnable poison per unit length in the axial direction and the content of the burnable poison per unit of length in the axial direction in the uppermost section is less than that in one or more sections outside of the enriched uranium section.

2. 发明专利

DE4014861C2 未知
公开(公告)号：DE4014861C2
公开(公告)日：1993-06-03
申请号：DE4014861
申请日：1990-05-09
申请人： TOSHIBA KAWASAKI KK , HITACHI LTD , GEN ELECTRIC
发明人： OGIYA SHUNSUKE , YAMAMOTO TORU , HAIKAWA KATSUMASA , NISHIMURA AKIRA
IPC分类号： G21C3/328 , G21C3/30 , G21C3/326 , G21C5/00
摘要： A fuel assembly of the type having a plurality of a fuel material characterized in that a water rod disposed in a channel has a large diameter so that it has a space into which a plurality of fuel rods could be loaded and liquid water boil flows through the water rod and which has a section filled with a fuel material comprising a natural uranium section defined at least one of the upper and lower ends of each fuel rod and an enriched uranium section comprising the uppermost, intermediate and lowermost sections each having a different degree of average enrichment across a cross section of the fuel assembly and the upper and lowermost sections have the degree of enrichment across a section of the fuel assembly is lower than that of the intermediate section, and the enriched uranium section has two sections each of which has a different content of a burnable poison per unit length in the axial direction and the content of the burnable poison per unit of length in the axial direction in the uppermost section is less than that in one or more sections outside of the enriched uranium section.

3. 发明专利

SE9001678D0 未知
公开(公告)号：SE9001678D0
公开(公告)日：1990-05-10
申请号：SE9001678
申请日：1990-05-10
申请人： GEN ELECTRIC , HITACHI LTD , TOSHIBA KK
发明人： OGIYA SHUNSUKE , YAMAMOTO TORU , HAIKAWA KATSUMASA , NISHIMURA AKIRA
IPC分类号： G21C3/328 , G21C3/30 , G21C3/326 , G21C5/00
摘要： A fuel assembly of the type having a plurality of a fuel material characterized in that a water rod disposed in a channel has a large diameter so that it has a space into which a plurality of fuel rods could be loaded and liquid water boil flows through the water rod and which has a section filled with a fuel material comprising a natural uranium section defined at least one of the upper and lower ends of each fuel rod and an enriched uranium section comprising the uppermost, intermediate and lowermost sections each having a different degree of average enrichment across a cross section of the fuel assembly and the upper and lowermost sections have the degree of enrichment across a section of the fuel assembly is lower than that of the intermediate section, and the enriched uranium section has two sections each of which has a different content of a burnable poison per unit length in the axial direction and the content of the burnable poison per unit of length in the axial direction in the uppermost section is less than that in one or more sections outside of the enriched uranium section.

4. 发明专利

SE505682C2 未知
公开(公告)号：SE505682C2
公开(公告)日：1997-09-29
申请号：SE9001678
申请日：1990-05-10
申请人： TOSHIBA KK , HITACHI LTD , GEN ELECTRIC
发明人： OGIYA SHUNSUKE , YAMAMOTO TORU , HAIKAWA KATSUMASA , NISHIMURA AKIRA
IPC分类号： G21C3/328 , G21C3/30 , G21C3/326 , G21C5/00 , G21C3/04
摘要： A fuel assembly of the type having a plurality of a fuel material characterized in that a water rod disposed in a channel has a large diameter so that it has a space into which a plurality of fuel rods could be loaded and liquid water boil flows through the water rod and which has a section filled with a fuel material comprising a natural uranium section defined at least one of the upper and lower ends of each fuel rod and an enriched uranium section comprising the uppermost, intermediate and lowermost sections each having a different degree of average enrichment across a cross section of the fuel assembly and the upper and lowermost sections have the degree of enrichment across a section of the fuel assembly is lower than that of the intermediate section, and the enriched uranium section has two sections each of which has a different content of a burnable poison per unit length in the axial direction and the content of the burnable poison per unit of length in the axial direction in the uppermost section is less than that in one or more sections outside of the enriched uranium section.

5. 发明专利

SE9001678L 未知
公开(公告)号：SE9001678L
公开(公告)日：1990-11-11
申请号：SE9001678
申请日：1990-05-10
申请人： GEN ELECTRIC , HITACHI LTD , TOKYO SHIBAURA ELECTRIC CO
发明人： OGIYA SHUNSUKE , YAMAMOTO TORU , HAIKAWA KATSUMASA , NISHIMURA AKIRA
IPC分类号： G21C3/328 , G21C3/30 , G21C3/326 , G21C5/00
摘要： A fuel assembly of the type having a plurality of a fuel material characterized in that a water rod disposed in a channel has a large diameter so that it has a space into which a plurality of fuel rods could be loaded and liquid water boil flows through the water rod and which has a section filled with a fuel material comprising a natural uranium section defined at least one of the upper and lower ends of each fuel rod and an enriched uranium section comprising the uppermost, intermediate and lowermost sections each having a different degree of average enrichment across a cross section of the fuel assembly and the upper and lowermost sections have the degree of enrichment across a section of the fuel assembly is lower than that of the intermediate section, and the enriched uranium section has two sections each of which has a different content of a burnable poison per unit length in the axial direction and the content of the burnable poison per unit of length in the axial direction in the uppermost section is less than that in one or more sections outside of the enriched uranium section.

6. 发明专利

JPH07234293A FUEL ASSEMBLY AND NUCLEAR REACTOR 失效
公开(公告)号：JPH07234293A
公开(公告)日：1995-09-05
申请号：JP25402993
申请日：1993-10-12
申请人： HITACHI LTD , TOSHIBA CORP , GEN ELECTRIC
发明人： HAIKAWA KATSUMASA , MOCHIDA TAKAAKI , NAGANO MAMORU , NAKAJIMA TAKESHI
IPC分类号： G21C5/00 , G21C3/326 , G21C3/328 , G21C3/62
摘要： PURPOSE: To increase the burn-up of fuel assembly while sufficiently keeping the safety margin such as thermal margin, furnace shotdown margin or the like of a reactor, with low increase of the average enrichment. CONSTITUTION: Two water rods of large diameter are installed in adjacent to each other in region where seven fuel rods can be installed. A short fuel rod and a low fuel rod are used as the fuel rod. The natural uranium regions are formed at the upper and lower edges of a fuel effective length region of the fuel assembly. An enriched uranium region located between the natural uranium region, has the upper, centeral and lower regions, and the average enrichment is successively lowered by the order of the central region, the lower region and the upper region. The difference of the average enrichment between the centeral region and the lower region is smaller than that between the central region and the upper region. The density of the burnable position of the upper region is lower than that of the other region in the enriched uranium region.

7. 发明专利

DE3837244A1 未知
公开(公告)号：DE3837244A1
公开(公告)日：1989-05-24
申请号：DE3837244
申请日：1988-11-02
申请人： HITACHI LTD
发明人： HAIKAWA KATSUMASA
IPC分类号： G21C3/326

8. 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.

9. 发明专利

JP2000314792A INITIAL LOADING REACTOR CORE, AND FUEL ASSEMBLY 失效
公开(公告)号：JP2000314792A
公开(公告)日：2000-11-14
申请号：JP12380099
申请日：1999-04-30
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANDA AKIKO , HAIKAWA KATSUMASA
IPC分类号： G21C5/18 , G21C3/328
摘要： PROBLEM TO BE SOLVED: To provide an initial loading reactor core capable of flattening an axial-directional output distribution to satisfy a thermal characteristic, by setting an enrichment difference to a proper value relating to a fuel of low enrichment, and provide a fuel assembly loaded onto the initial loading reactor core. SOLUTION: Many kinds of fuel assemblies arranged with plural fuel rods in each inside, and different in enrichment are plurally loaded in an initial loading reactor core. In the initial loading reactor core, a fuel A of low average enrichment out of the fuel assemblies is made to have a difference of 0.5 wt.% or more and 1.0 wt.% or less of between uranium average enrichments in its upper part and its lower part, excepting a neutral uranium portion. For example, the difference in the uranium average enrichment is 0.8 wt.% between an upper fuel region 42 and a lower fuel region 4, to satisfy the range within 0.5 wt.% or more and 1.0 wt.% or less.

10. 发明专利

JPH11287881A FUEL ASSEMBLY 失效
公开(公告)号：JPH11287881A
公开(公告)日：1999-10-19
申请号：JP9122898
申请日：1998-04-03
申请人： HITACHI LTD
发明人： HARAGUCHI HIROKO , HAIKAWA KATSUMASA
IPC分类号： G21C3/328 , G21C3/326 , G21C3/62
摘要： PROBLEM TO BE SOLVED: To raise used fraction of recovered uranium in a fuel assembly, by using recovered uranium obtained by reprocessing of spent fuel in the highest enrichment pellets in fuel assembly. SOLUTION: A fuel assembly has natural uranium at the both ends and the enrichment distribution in a fuel rod is highest at A which is followed by B, C, D and E lower in this order. The fuel rod types are 1 to 5 according to the enrichment distribution. The fuel rod type P is fuel rod of short length, type G is fuel rod including gadolinia and type 16 is water rods. As a fuel assembly for boiling water reactor has a plenty of light water around a fuel assembly, low enrichment fuel rods are arranged in the periphery and high enrichment fuel rods, in the center part to ensure thermal margin. By this arrangement, when the average enrichment increases, the loading fraction of fuel pellet with the highest enrichment becomes high. By using recovered uranium for fuel pellets of the highest enrichment, using quantity of recovered uranium can be raised.

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