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1. 发明专利

JPS6457195A FUEL ASSEMBLY FOR BOILING WATER REACTOR 失效
公开(公告)号：JPS6457195A
公开(公告)日：1989-03-03
申请号：JP21125887
申请日：1987-08-27
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： HIRAIWA KOJI , WATANABE SHOICHI , NAGANO MAMORU
IPC分类号： G21C3/328 , G21C3/30 , G21C3/32 , G21C3/326
摘要： PURPOSE:To raise an infinite multiplication factor and fuel economy, by flattening a ratio distribution of density of hydrogen atoms to uranium atoms (H/U) for all region from an upper part to a lower part of a fuel in a reactor core during its operation. CONSTITUTION:An upper part of a water rod 6 has a number of water outlets 14 on an upper end position of fuel pellets, is constricted upwardly from the position, an upper end of the rod 6 is connected to an upper end plug 8 and the end plug 8 is fixed to a central part of an upper tie plate 10. And a lower part of the rod 16 is constricted downwardly from a position of one-third of whole rod length to become approximately the same diameter as an outer diameter of a fuel rod 4. And also an upper end of a short length fuel having two-thirds length of a full length fuel is fixed by a spacer 5 and there exists no fuel rod above there. An upper end of another short length fuel 4 having one-third length of a full length fuel is also fixed by a spacer 16 and there exists no fuel rod above there. In this way, a distribution of H/U can be flattened from an upper stream side through a down stream side a coolant pass by combining a rod 6 being fat at a down stream side of a coolant pass and slender at a upper stream side of that, with two kinds of the partial length fuels.

2. 发明专利

JPS6264983A CONTROL ROD FOR NUCLEAR REACTOR 失效
公开(公告)号：JPS6264983A
公开(公告)日：1987-03-24
申请号：JP20345985
申请日：1985-09-17
申请人： TOSHIBA CORP , NIPPON ATOMIC IND GROUP CO
发明人： NAGANO MAMORU
IPC分类号： G21C7/10

3. 发明专利

JPS6232386A FUEL AGGREGATE FOR LIGHT WATER REACTOR 失效
公开(公告)号：JPS6232386A
公开(公告)日：1987-02-12
申请号：JP17282185
申请日：1985-08-06
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： ISHIDA HIROMI , NAGANO MAMORU
IPC分类号： G21C3/328 , G21C3/30 , G21C3/62

4. 发明专利

JPS6428587A FUEL ASSEMBLY FOR NUCLEAR REACTOR 失效
公开(公告)号：JPS6428587A
公开(公告)日：1989-01-31
申请号：JP18358287
申请日：1987-07-24
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： HIDA KAZUTAKA , NAGANO MAMORU
IPC分类号： G21C3/30 , G21C3/328
摘要： PURPOSE:To suppress a rise in the internal pressure, by making the fuel effective length of a second group of fuel rods less than that of a first group of fuel rods to enhance plenum. CONSTITUTION:Fuel rods 3 are arranged in a square lattice of 8 line X 8 column and ten 3A indicated by G out of sixty fuel rods are filled with a pellet of oxide mixed with enriched uranium and gadolinium as neutron absorbing substance to control an excess of reactivity. The remaining fifty fuel rods I-IV are normal uranium rods. At the center of the fuel rods, a large-diameter water rod W is arranged to run much cooling water. The fuel effective length of a gadolinia rod G is made shorter by one-twelfth than that of the uranium rods I-IV. The enrichment of the fuel rods and the gadolinia concentration give values as listed.

5. 发明专利

JPS6423195A FUEL ASSEMBLY 失效
公开(公告)号：JPS6423195A
公开(公告)日：1989-01-25
申请号：JP17921387
申请日：1987-07-20
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： UEDA KIYOSHI , SAKURADA KOICHI , NAGANO MAMORU
IPC分类号： G21C3/326 , G21C3/28 , G21C3/30 , G21C3/32 , G21C3/328 , G21C3/334
摘要： PURPOSE:To obtain a fuel assembly which allows the shut-down of a nuclear reactor in spite of increasing the enrichment of fuel and is improved in an axial power distribution and the pressure drop of a coolant by constituting fuel rods of long-sized fuel rods and at least one kind of short-size fuel rods and disposing the short-sized fuel rods to intersected straight line shapes, etc., in the fuel assembly. CONSTITUTION:A square water rod 22 is disposed at the center in this case and 9 lines and 9 rows of the long-sized fuel rods 20 and the short-sized fuel rods 21 are regularly disposed. The outside thereof is enclosed by a channel box 32 and further, the top and bottom ends thereof are respectively fixed by an upper tie plate 24 and a lower tie plate 25. The short-sized fuel rods 21 are disposed to the intersected straight line shapes, etc., in the fuel assembly and the nuclear fuel material is expelled to the intersected straight line shapes, etc., from the relatively upper part of the reactor core where the shot-down allowance of the nuclear reactor is severer. The shut-down allowance of the reactor is thus improved. Furthermore, the axial distribution of the power is improved and the pressure drop of the coolant is decreased so that contribution is made to the stability of the channel.

6. 发明专利

JPH0198994A FUEL ASSEMBLY 失效
公开(公告)号：JPH0198994A
公开(公告)日：1989-04-17
申请号：JP25619187
申请日：1987-10-13
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： UEDA KIYOSHI , MITSUTAKE TORU , SAKURADA KOICHI , HIRAIWA KOJI , HATTORI YASUHIRO , ECHIGOYA HIRONORI , NAGANO MAMORU
IPC分类号： G21C3/34 , G21C3/30 , G21C3/324
摘要： PURPOSE:To obviate a decrease of a thermal margin which an assembly has, and also, to raise the reactor core characteristic and the profitability by scraping the inside surface of a channel box of the assembly so that it becomes thinner toward the downstream side and the passage area is expanded. CONSTITUTION:As for a channel box 1 of an assembly, its external form is uniform in the axial direction of the channel box 1, wall thickness of the channel box material is thick in the upstream of a flow of cooling water, becomes thinner gradually toward the downstream except the downstream end part which the upper tie plate abuts on, and a cross-sectional area of the inside of the channel box 1 increases. Therefore,a pressure loss can be reduced effectively. This fact can reduce power of a pump and signifies to improve the profitability of power generation immediately. Also, on the contrary, by raising the flow rate of cooling water higher than its normal rate and lowering the void coefficient at the last stage of a cycle, the reactor core reactivity is raised, the cycle can be extended to a long period of time, and the profitability of power generation can be raised thereby, as well.

7. 发明专利

JPS63108294A FUEL AGGREGATE FOR BOILING WATER TYPE REACTOR 失效
公开(公告)号：JPS63108294A
公开(公告)日：1988-05-13
申请号：JP25185486
申请日：1986-10-24
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： WATANABE SHOICHI , NAGANO MAMORU
IPC分类号： G21C3/28 , G21C3/30 , G21C3/328 , G21C3/62

8. 发明专利

JPS6316292A METHOD OF CHARGING FUEL TO NUCLEAR REACTOR 失效
公开(公告)号：JPS6316292A
公开(公告)日：1988-01-23
申请号：JP16119186
申请日：1986-07-09
申请人： TOSHIBA CORP , NIPPON ATOMIC IND GROUP CO
发明人： NAGANO MAMORU , WATANABE SHOICHI
IPC分类号： G21C7/00 , G21C5/12

9. 发明专利

JPH026785A FUEL ASSEMBLY 失效
公开(公告)号：JPH026785A
公开(公告)日：1990-01-10
申请号：JP15665888
申请日：1988-06-27
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： UEDA KIYOSHI , HIRAIWA KOJI , NAGANO MAMORU
IPC分类号： G21C3/328 , G21C3/30 , G21C3/32 , G21C3/326 , G21C3/334
摘要： PURPOSE:To allow nuclear reactor shut-down even if enrichment of fuel is increased by disposing an interposing member region of interposing member- contg. fuel to the part where the subcritical degree is shallow during the reactor shut-down so as to enclose a large-diameter water rod. CONSTITUTION:The extra-large diameter water rod 25 is disposed to the central part of the fuel assembly and the fuel rod of sub-bundles facing this water rod 25 is used as the interposing member-contg. fuel rod 22. The long-sized part-long fuel rods 23 are disposed to the center of the sub-bundles positioned in the respective corners and the short-sized part-long fuel rods 24 are disposed around the small-diameter part below the water rod 25. Further, the interposing member 26 of the fuel rod 22 is disposed to the part where the subcritical degree is shallowest during the reactor shut-down. The length of this member 26 is longer than the thermal neutron diffusion distance in the reactor cool state and is

10. 发明专利

JPS63113391A FUEL AGGREGATE 失效
公开(公告)号：JPS63113391A
公开(公告)日：1988-05-18
申请号：JP25861886
申请日：1986-10-31
申请人： TOSHIBA CORP , NIPPON ATOMIC IND GROUP CO
发明人： YAMAMOTO TORU , NAGANO MAMORU , WATANABE SHOICHI
IPC分类号： G21C3/328 , G21C3/30

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