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1. 发明专利

JP2002122689A BOILING WATER TYPE NUCLEAR POWER PLANT 失效
公开(公告)号：JP2002122689A
公开(公告)日：2002-04-26
申请号：JP2000317170
申请日：2000-10-17
申请人： TOSHIBA CORP
发明人： NAKAMARU MIKIHIDE , HIOKI HIDEAKI , SAITO TAKEHIKO , HIRAIWA KOJI , NARABAYASHI SUNAO , OMIZU SATOSHI , SHIMODA TSUYOSHI , ARAI KENJI , MOROOKA SHINICHI , SUZUKI SEIJIRO
IPC分类号： G21C9/00 , G21C1/08 , G21C9/004 , G21C15/18 , G21D1/00
摘要： PROBLEM TO BE SOLVED: To surely reduce the pressure of a containment in a dynamic safety system, based on simplified constitution in a static safety system. SOLUTION: A dynamic containment spray-cooling system is added as a safety system to limit radiation leakage over a long period after an accident by reducing the pressure of the containment, in this boiling water type nuclear power plant having a pressure-reducing valve and a gravity falling type reactor core water injection system as an emergency reactor core cooling system, and having a static containment cooling system 714 and a containment water-flooding system as a containment cooling system.

2. 发明专利

JP2002122687A NUCLEAR REACTOR CORE AND METHOD OF OPERATING NUCLEAR REACTOR 失效
公开(公告)号：JP2002122687A
公开(公告)日：2002-04-26
申请号：JP2000317168
申请日：2000-10-17
申请人： TOSHIBA CORP
发明人： NAKAMARU MIKIHIDE , HIOKI HIDEAKI , SAITO TAKEHIKO , HIRAIWA KOJI , NARABAYASHI SUNAO , OMIZU SATOSHI , SHIMODA TSUYOSHI , ARAI KENJI , MOROOKA SHINICHI , SUZUKI SEIJIRO
IPC分类号： G21C1/08 , G21C3/328 , G21C5/00 , G21C7/04 , G21C7/113 , G21C7/14 , G21C7/24 , G21C7/27
摘要： PROBLEM TO BE SOLVED: To provide a nuclear reactor core capable of operating a nuclear plant continuously over for 15 years or more without requiring fuel replacement, capable of shortening maintenance manhours and a term of a periodical inspection in the plant, capable of contributing to remarkable enhancement in plant operation rate and an economical aspect, and effective for prevention of nuclear proliferation. SOLUTION: Plural fuel assemblies 103 constituted to be arranged with fuel rods 100 and water rods 107 square-grating likely are arranged square-grating- likely with a fixed pitch. Respective blades 102a of a cross-shaped control rod 102 are insertion-arranged respectively between clearances faced with four adjacent fuel assemblies 100. A ratio B/S of each blade width B of the control rod 102 to a fuel grating area S which is an area of a square having one pitch of the fuel assemblies 103 as its one side is set to be 0.06 or more.

3. 发明专利

JP2001116875A FUEL ASSEMBLY AND NUCLEAR REACTOR 失效
公开(公告)号：JP2001116875A
公开(公告)日：2001-04-27
申请号：JP29247199
申请日：1999-10-14
申请人： TOSHIBA CORP
发明人： HIRAIWA KOJI , HAYASHI YAMATO , HIRANO YASUSHI
IPC分类号： G21C3/328 , G21C7/04
摘要： PROBLEM TO BE SOLVED: To enhance the thermal performance of a fuel assembly by reducing the residual reactivity of residual toxics at the end period of a cycle. SOLUTION: In the fuel assembly, Gd isotopes with an odd mass number in a gadolinium fuel rod are enriched to a level above the isotopic ratio of natural Gd and the ratio of the content of Gd-155 to the content of Gd-157 is 0.1 or less. The average concentration (weight percentage) of gadolinium enriched is set in the range represented by the following expression: G

4. 发明专利

JPH08233989A REACTOR POWER PLANT AND OPERATION METHOD 失效
公开(公告)号：JPH08233989A
公开(公告)日：1996-09-13
申请号：JP3530595
申请日：1995-02-23
申请人： TOSHIBA CORP
发明人： HIRAIWA KOJI , HAYASHI YAMATO , YAMADA KATSUMI
IPC分类号： G21D3/00 , G21D3/08
摘要： PURPOSE: To control the reactivity of a reactor and power of a turbine by using a part of steam generated in the reactor and regulating feed water temperature and provide a reactor power plant and operation method capable of improving the thermal characteristics of reactor of natural circulation type and economy of fuel. CONSTITUTION: In a reactor power plant of boiling water reactor with negative void reactivity during power operation, a steam extraction type feed water temperature controller means consisting of a steam extractor 16 for extracting a part of steam generated in the reactor, extracted steam controller 17 for controlling the extracted steam, and a feed water heater 18 for heating the reactor feed water with this extracted steam as heat source is provided to control the reactivity in the reactor by regulating the extracted steam flow for supplying to the feed water heater 18.

5. 发明专利

JPH04294294A CORE OF NUCLEAR REACTOR 失效
公开(公告)号：JPH04294294A
公开(公告)日：1992-10-19
申请号：JP5927291
申请日：1991-03-25
申请人： TOSHIBA CORP
发明人： HIRAIWA KOJI
IPC分类号： G21C3/322 , G21C3/328 , G21C5/00
摘要： PURPOSE:To increase reactivity of a core of nuclear reactor and to obtain the reactor core with high fuel efficiency by utilizing difference of void reactivity of fuel assemblies. CONSTITUTION:A core of nuclear reactor is constituted of combination of a first fuel assembly 1 having infinite multiplication factor increasing for increment of average void ratio of the fuel assembly, and a second fuel assembly 10 having infinite multiplication factor decreasing against increment of average void ratio of the fuel assembly. In this situation, flow resistance of a flow path 7 of cooling water passing through the first fuel assembly 1 is set higher than that of a flow path 8 of cooling water passing through the second fuel assembly 10.

6. 发明专利

JPH04286992A CONTROL ROD FOR ATOMIC REACTOR 失效
公开(公告)号：JPH04286992A
公开(公告)日：1992-10-12
申请号：JP5138891
申请日：1991-03-15
申请人： TOSHIBA CORP
发明人： HIRAIWA KOJI , KIKUCHI TSUKASA , UEDA KIYOSHI
IPC分类号： G21C7/113 , G21C7/10
摘要： PURPOSE:To increase the filled quantity of neutron absorber and improve the reactivity of a control rod by arranging in parallel a plurality of neutron absorption rods of a thick diameter and arranging a plurality of neutron absorption rods of a thin diameter at middle positions between adjacent neutron absorption rods of the thick diameter. CONSTITUTION:A plurality of neutron absorption rods 1 of a thick diameter (a) having a circle section is in parallel arranged, and two neutron absorption rods 2 of a thin diameter (b) having a circle section are arranged at positions vertical to the arrangement direction of absorption rods 1, at middle positions between adjacent absorption rods 1. For example, put a/b=4. Further, the circumference of the absorption rods 1, 2 is enclosed with a thin sheet-form control rod sheath 3, and a control rod wing 4 is formed in a plate shape by combining it with a central structural material 10. An absorption rod 1 is made by filing up powders 6 of boron carbide within a stainless steel pipe 5 and the absorption rod 2 is a hafnium rod. Four, for example, absorption rods 1 situated within about 2cm from the end of the control rod wing are transposed with hafnium rods 7 of a thick diameter (a). By the above, the reactivity of the control rod can be increased because the filled rate of the neutron absorber increases.

7. 发明专利

JPH03128484A NUCLEAR REACTOR 失效
公开(公告)号：JPH03128484A
公开(公告)日：1991-05-31
申请号：JP17701889
申请日：1989-07-11
申请人： TOSHIBA CORP
发明人： HIRAIWA KOJI
IPC分类号： G21C5/12
摘要： PURPOSE:To suppress the output keeping of the whole reactor core and to improve reactor core characteristics by making >=2 fuel assemblies of >=3 in-core residence cycles adjoin to fuel assemblies of =2 fuel assemblies of >=3 in-core residence cycles adjoin fuel assemblies of

8. 发明专利

JPH02103491A FUEL ASSEMBLY 失效
公开(公告)号：JPH02103491A
公开(公告)日：1990-04-16
申请号：JP25585088
申请日：1988-10-13
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： HIRAIWA KOJI , HIRANO YASUSHI , OGIYA TOSHISUKE
IPC分类号： G21C3/328 , G21C3/30 , G21C3/326
摘要： PURPOSE:To obtain a fuel assembly with superior heat characteristics by combining the array of combustible poison-containing fuel rods with the other array of short fuel rods to arrange the number of the fuel rods of fuel assembly cross section so as to increase as it lowers. CONSTITUTION:In a fuel assembly 23 in which fuel rods 1-4 are arranged in the form of a lattice in nine lines and nine rows, combustible poison-containing fuel rods G are arranged at 12 coordinate positions of the coordinates (2,2), (2,3), (3,2), (7,2), (8,2), (8,3), (2,7), (2,8), (3,8), (8,8), (8,7) and (7,8), short fuel rods 2, 3 of short fuel rod effective length are used to arrange the number of the fuel rods of the cross section of the fuel assembly 23 so as to increase as it comes toward the lower part thereof. Or the lower end to 1/2 or 1/3 of the effective part of the fuel rods 1-4 is made a boundary, the position of 1 to at most 5 of the number of the fuel rods is monopolized at the lower part than that, and water rods water rods 10 monopolizing the position of 7 to at most 9 of the number of the fuel rods are provided at the higher part than that to arrange the short fuel rods 2, 3 of the length of 1/2 or 1/3 of the fuel rod effective length in its lower part space.

9. 发明专利

JPH01296192A FUEL ASSEMBLY 失效
公开(公告)号：JPH01296192A
公开(公告)日：1989-11-29
申请号：JP12596788
申请日：1988-05-25
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： HIRAIWA KOJI , UEDA KIYOSHI
IPC分类号： G21C3/32
摘要： PURPOSE:To make spectral shift operation possible by providing a flow-in hole and a flow-out hole of moderator on the upper and the lower parts of divided water rod upper and lower outer tubes and controlling an opening area by the difference of neutron irradiation growth of an upper inner tube, an outer tube and the like. CONSTITUTION:A fuel assembly is axially divided into upper outer tubes 13 and lower outer tubes 14 by a plug 12 arranged at the position of 1/2-1/4 of whole water rod length from the lower end part of a water rod 11. Flow-in holes 15a, 15b and flow-out holes 16a, 16b of moderator are drilled in the upper and lower parts of the outer tubes 13, 14 respectively. Further an upper inner tube 17 whose neutron irradiation growth quantity is smaller than that of the outer tube 13 is drilled on the plug 12 in the outer tube 13 and a lower inner tube 18 whose neutron irradiation growth quantity is larger than that of the outer tube 14 is hung on the lower face of the plug 12 in the outer tube 14. The opening area of the flow-out hole 16a and the flow-in hole 15b are controlled by the difference of the neutron irradiation growth quantity of the inner tube 17 and the outer tube 13 and that of the inner tube 18 and the outer tube 13.

10. 发明专利

JPH01178893A FUEL ASSEMBLY FOR BOILING WATER NUCLEAR REACTOR 失效
公开(公告)号：JPH01178893A
公开(公告)日：1989-07-17
申请号：JP251688
申请日：1988-01-11
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： HIRAIWA KOJI , OGIYA TOSHISUKE
IPC分类号： G21C3/328 , G21C3/30 , G21C3/33
摘要： PURPOSE:To improve a fuel economy while keeping a safety feature, by arranging fuel rods with 9 rows and 9 columns or more and by raising a fuel enrichment of fuel rods located outer part of a fuel assembly to be higher. CONSTITUTION:72 fuel rods e1, e2, e3 and G are arranged in a square grid shape with 9 rows and 9 columns and one water rod W is placed at the center part. U-235 concentrations of the fuel rods e1, e2 and e3 are 4.9%, 4.4% and 3.4%, respectively. A U-235 concentration of the fuel rod G is 4.4% and the fuel rod G contains a burnable poison. Therewith, because of a higher average concentration of fuel rods in an outer region which have a large relative reactivity value, a fuel economy can be improved. A design standard of a local output peaking factor can be raised compared to an existing 8-rows-and-8-columns (60 fuel rods in total) arrangement, by adopting a 9-rows-and-9-columns arrangement. Therefore, the local output peaking factor can be kept within a standard even though the U-235 concentration of the outer part fuel rods is much high, and the safety can be maintained.

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