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1. 发明专利

SE9602963L 未知
公开(公告)号：SE9602963L
公开(公告)日：1997-02-23
申请号：SE9602963
申请日：1996-08-13
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KUROSAKI HIDEKI , ITO KENICHI , SASAKI MASANA , TOKUNAGA KENSUKE
IPC分类号： G21C3/28 , G21C21/02 , G21C3/60

2. 发明专利

SE9602963D0 未知
公开(公告)号：SE9602963D0
公开(公告)日：1996-08-13
申请号：SE9602963
申请日：1996-08-13
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KUROSAKI HIDEKI , ITO KENICHI , SASAKI MASANA , TOKUNAGA KENSUKE
IPC分类号： G21C3/28 , G21C21/02 , G21C

3. 发明专利

JPS6450995A WITHDRAWAL OF FUEL ROD 失效
公开(公告)号：JPS6450995A
公开(公告)日：1989-02-27
申请号：JP20635287
申请日：1987-08-21
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI SERVICE ENG , HITACHI NUCLEAR ENG
发明人： SEYA TORU , TOKUNAGA KENSUKE , GOTO FUMIHIRO , SEYA SATOSHI
IPC分类号： G21C19/33
摘要： PURPOSE:To enable an easier withdrawal of fuel rod, by giving an impact energy by a spring or pneumatic pressure directly to a lower end plug of a fuel rod and by lifting up the fuel rod upwardly to push the fuel rod up from its lower most part and to release it from sticking with other parts. CONSTITUTION:By moving and setting a fuel assembly to and in a fuel channel handling machine 11, by setting previously an angle of a nail 15 of a pneumatic driven fuel rod withdrawal jig 14 at a corresponding position of a fuel rod to be withdrawn, by lifting the jig 14 by jibcrane and by attaching setting guide 16 to a lower receiving table 12 of the machine 11, the nail 15 can be set to a lower part of a lower end plug of fuel rod to be withdrawn. Consequently, air from a baby compressor 17 is led to a piston 20 of a cylinder, a notch 21 is lifted up by an energy of a spring 23 with decoupling of the notch 21 and a movement of the notch 21 is transferred to a rod 24 as an impact energy and finally the nail 15 pushes up the lower end plug of the fuel rod. The lifted-up fuel rod is grasped by a rod grapple and the rod is withdrawn from the fuel assembly with the descending channel handling machine 11 after removal of the withdrawal jig.

4. 发明专利

JPH08114692A FUEL SPACER AND FUEL ASSEMBLY 失效
公开(公告)号：JPH08114692A
公开(公告)日：1996-05-07
申请号：JP19944795
申请日：1995-08-04
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： TOKUNAGA KENSUKE , AIZAWA YASUHIRO , NAKAJIMA JUNJIRO , SASAKI MASANA , YASUJIMA MASAKICHI , IMAI MASABUMI
IPC分类号： G21C3/33 , G21C3/344
摘要： PURPOSE: To reduce the coolant pressure loss and improve assembling capability of fuel assembly by constituting so that the axial distances between top ends of the first and the second opening regions and between top ends of the first and the second connecting parts are nearly equal and the axial distances between bottom ends of both opening regions and between bottom ends of both connecting parts are different. CONSTITUTION: As the axial distance L1 between top ends of the first and the second opening regions 13a and 13b of a round cell 6 and the axial distances between top ends of the first and the second connecting parts 30U and 30L are equal, even with an upward movement of a loop shape spring part 9 against the cell 6, the upper end of the part 30U is in contact with the top end of region 13a and so the part 9 is kept in the state where the center axis direction agrees with the coolant flow direction and coolant pressure loss is reduced. As the distance L2 between bottom ends of regions 13a and 13b is smaller than the distance S2 between bottom ends of parts 30U and 30L, the friction force in fuel element 2 insertion through near the part 9 is small and easy to insert and assembling capability is improved.

5. 发明专利

JPH04201112A REMOVAL METHOD OF FIXING NUT 失效
公开(公告)号：JPH04201112A
公开(公告)日：1992-07-22
申请号：JP32919890
申请日：1990-11-30
申请人： HITACHI LTD , HITACHI ENG CO LTD , HITACHI NUCLEAR ENG
发明人： TOKUNAGA KENSUKE , NOMURA TEIJI , OKUDA SHINICHI , UMEHARA HAJIME , ISAKA MASAYUKI , SEYA SATOSHI
IPC分类号： B23D29/02
摘要： PURPOSE:To divide a nut only without giving any damage to a male thread by reducing nut wall in the radial direction at its restricted portion in the circumferential direction of the nut and giving a tension to the reduced wall portion in the circumferential direction. CONSTITUTION:A nut holder 4 is fitted to a nut 1 so that its edge 3A with small included angle is pressed against the nut 1. Next, water is supplied through a pressure hose 7 into a cylinder to cut in the nut by the edge 3 through a piston 5. In this case, the stroke of the piston 5 is limited by a stopper screw 6 and, therefore, a male thread 2 will not be damaged by the edge 3. In addition, a device 8 is set upside down at the reverse position to that in the first step, the device 8 is reversed and fitted into the nut 1 so that its edge with a large included angle is pressed against the nut 1. With the nut holder 4 fitted to the nut 1 correctly, the wedge type edge 3 is re-pressed to give a tension for dividing the nut in both the right and left directions. Accordingly, the nut is divided by a small pressing force. In this case, also the stroke of the edge is limited by the stopper screw 6 and, therefore, the male threads 2 will not be damaged.

6. 发明专利

JPH02161390A METHOD FOR CHARGING FUEL ASSEMBLY 失效
公开(公告)号：JPH02161390A
公开(公告)日：1990-06-21
申请号：JP31390288
申请日：1988-12-14
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： MATSUURA TETSUAKI , TOKUNAGA KENSUKE , OKUDA SHINICHI , NAKAI KEIICHI
IPC分类号： G21C5/00 , G21C19/19
摘要： PURPOSE:To make effective utilization of channel boxes by making predictive calculation of the difference in the irradiation quantity of fast neutrons on two opposite side faces of all the channel boxes in operation and evaluating the interference of the channel boxes and control rods. CONSTITUTION:The fast neutron fluxes phi of all the fuel assemblies are calculated by using predictive calculation codes with respective cycles and the inclinations DELTAphi of the fast neutrons between the two opposite side faces of the channel boxes (CB) are determined and are multiplied by the irradiation time of the respective cycles, by which DELTAphi.t of all the CBs in the core at the end of the respective cycles are calculated. The DELTAphi.t are compared with phic.t having the possibility that the CBs interfere with the control rods and if there is the CB which attains DELTAphi.t>DELTAphic.t, such CB is exchanged with the CB in the position having such DELTAphi at which bending arises in a reverse direction. The optimum fuel charge position at which the number of the CBs to attain DELTAphi.t>DELTAphic.t are minimized is determined by repeating the above-mentioned procedures. Thus the CBs are utilized effectively.

7. 发明专利

JPH02154193A FUEL ASSEMBLY 失效
公开(公告)号：JPH02154193A
公开(公告)日：1990-06-13
申请号：JP30783088
申请日：1988-12-07
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SUZUKI SHUJI , KONUKI NORIHIKO , TOKUNAGA KENSUKE
IPC分类号： G21C3/10 , G21C3/33
摘要： PURPOSE:To safely and easily withdraw a fuel element from a fuel assembly by tapering the shank part of a lower end plug of the fuel element or the insertion hole of the lower end plug of a lower tie plate. CONSTITUTION:The fuel element is constituted of the lower end plug 1, the upper end plug 2, a cladding pipe 3 and fuel pellets 4. This fuel element is inserted into the lower end plug insertion hole 7 of the lower tie plate 5 of the fuel assembly. The shank part 6 of the end plug 1 or the insertion hole 7 is tapered. Even if oxide films form and deposit on the shank part 6 or in the insertion hole 7 on progression of combustion, the spacing between the shank part 6 and the insertion hole 7 is assured and the safe and easy withdrawing of a plate 5 is executed.

8. 发明专利

JPS6088388A METHOD OF OPERATING NUCLEAR REACTOR 失效
公开(公告)号：JPS6088388A
公开(公告)日：1985-05-18
申请号：JP19582283
申请日：1983-10-19
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： MARU AKIRA , SAITOU SOUZOU , OGAWA TAKASHI , TOKUNAGA KENSUKE
IPC分类号： G21C7/00

9. 发明专利

JPH10221473A COOLANT FLOW CONTROLLER AND FUEL ASSEMBLY 失效
公开(公告)号：JPH10221473A
公开(公告)日：1998-08-21
申请号：JP2134397
申请日：1997-02-04
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： TOKUNAGA KENSUKE , AIZAWA YASUHIRO , IMAI MASABUMI , TOMITA TAKASHI , GOTO YASUYUKI
IPC分类号： G21C3/322
摘要： PROBLEM TO BE SOLVED: To reduce the number of parts used in a coolant flow controller by integrating a guide piece which guides the oscillation of a coolant flow control plate with a lower tie plate. SOLUTION: A lower tie-plate guide piece 18 which guides the oscillating extent of a coolant flow control plate 8 is installed to the outer side section of a lower tie plate 6. Consequently, the fixation of the control plate 8 between the guide piece 18 and tie plate 6 is eliminated. In addition, the two sides of the upper and lower thick surfaces of a keep plate 9 are physically engaged with a keep plate inserting groove 23 provided on the tie plate 6 and the right- side one of the two sides is fixed to the plate 6 by spot welding. Since no set screw is used for fixing the keep plate 9 to the plate 6, the number of parts used in a coolant flow controller is reduced and the reliability of the controller is improved. In addition, the assembling work of the controller is rationalized and the manufacturability of the controller is improved, because no screw tightening work nor the management of screw tightening forces is required.

10. 发明专利

JPH09119994A FUEL ROD, PRODUCTION THEREOF AND FUEL ROD ASSEMBLY 失效
公开(公告)号：JPH09119994A
公开(公告)日：1997-05-06
申请号：JP16410996
申请日：1996-06-25
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KUROSAKI HIDEKI , ITO KENICHI , SASAKI MASANA , TOKUNAGA KENSUKE
IPC分类号： G21C3/17 , G21C3/62 , G21C21/02
摘要： PROBLEM TO BE SOLVED: To reduce the production cost while maintaining the soundness of fuel and to achieve a high degree of burnup by encapsulating a nuclear fuel pellet having a mean grain size within a specified range and helium (He) gas having pressure within a specified range in a fuel rod. SOLUTION: A lower end plug 6 is welded to a fuel cladding tube 3 made of a zirconium alloy which is then filled with a plurality of uranium pellets 4 having a mean grain size of 30-60μm. In a welding chamber, He gas 1 is substituted for the gas, e.g. air, in the fuel cladding tube 3 and pressurized to 1-8atm. In the chamber filled with He gas of that pressure, an upper end plug 5 is welded to the fuel cladding tube made 3 while pressing the uranium pellet 4 by means of a plenum spring 7 thus sealing the inside of fuel rod 2 hermetically. The lower the encapsulation pressure of He at the time of producing fuel rod, the higher the pressure of gaseous fission product and the index of soundness of fuel rod, i.e., the inner pressure of fuel rod at the end of service life, is increased.

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