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1. 发明专利

JPH06331772A FUEL ASSEMBLY 失效
公开(公告)号：JPH06331772A
公开(公告)日：1994-12-02
申请号：JP12233393
申请日：1993-05-25
申请人： HITACHI LTD , HITACHI ENG CO LTD , TOSHIBA CORP
发明人： NAKAJIMA JUNJIRO , NISHIDA KOJI , SUGANO SATOSHI , MIZUNO TADASHI , BESSHO TAISUKE , INAGAKI MASATOSHI , AIZAWA YASUHIRO
IPC分类号： G21C3/344
摘要： PURPOSE:To increase the pushing force against fuel rods by providing a plurality of tubular coupling parts for coupling the resilient parts into a loop spring thereby decreasing the pressure drop of a fuel spacer. CONSTITUTION:A loop spring 17 comprises a pair of spring parts 19 (resilient part) forming a pair of opposing side walls, and two coupling parts 20 for coupling the spring parts at the opposite ends thereof, wherein the spring part 19 is provided with a central protrusion 10A. The coupling part 20 is a tube having rectangular cross-section and extending in the axial direction of a round cell 6. Consequently, an opening 21 is formed in the coupling part 20. A coolant 12 ascending between fuel rods 2 flows into the round cell 6. The coolant 12 ascends along the inner face of the round cell 6 and passes through the opening 21 at the lower end part thence through an opening at the upper end part thus reaching a part above the loop spring 17. Since disturbance of the coolant flow 12 is suppressed at each coupling part 20, pressure drop of coolant channel in decreased in the limited round cell 6 thus decreasing the pressure drop of fuel spacer and the fuel assembly.

2. 发明专利

JPH08146178A FUEL ASSEMBLY 失效
公开(公告)号：JPH08146178A
公开(公告)日：1996-06-07
申请号：JP29320394
申请日：1994-11-28
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANAMORI KENJI , YASUJIMA MASAKICHI , NAKAMURA SHOZO , MIZUNO TADASHI , NAKAJIMA JUNJIRO , KUROSAKI HIDEKI
IPC分类号： G21C3/322 , G21C3/33
摘要： PURPOSE: To restarin the amount of leakage water by stably controlling a leakage flow while securing a control rod passage enough. CONSTITUTION: When leakage water flows into a coolant leakage passage 6, it is increased in speed and decreased in pressure in a first passage part 6a, decreased in speed and increased in pressure in a second passage part 6b, and the static pressure of leakage water becomes equal to the static pressure in the passage 7 on the right side of a leakage flow control plate 2 in a leakage flow outlet 5 of a third passage part 6c. That is, though the pressure in the leakage passage is larger than the static pressure of the passage 7 in the inlet of the first passage part 6a, the former becomes equal to the latter in a certain position of the inlet of the first passage part, the former becomes smaller than the latter in the inlet of the second passage part 6b, a difference between the pressure and the static pressure of the passage 7 becomes smaller in the second passage part 6b, and they become equal in the leakage flow outlet 5. Accordingly, a throat part 2b, an enlarged part 2c and a parallel part 2d are pulled to the channel box 3 side to reduce the area of the leakage passage 6.

3. 发明专利

JPH08146177A FUEL ASSEMBLY LOWER TIE PLATE 失效
公开(公告)号：JPH08146177A
公开(公告)日：1996-06-07
申请号：JP28476994
申请日：1994-11-18
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： MIZUNO TADASHI , FUJIMURA HIDEKAZU , NAKAJIMA JUNJIRO , KUROSAKI HIDEKI , YASUJIMA MASAKICHI
IPC分类号： G21C3/33 , G21C3/322
摘要： PURPOSE: To form a leakage flow restrain structure with high reliability instead of a finger spring by providing a lateral groove on the side wall surface of a lower tie plate, and providing plural by-pass holes in the lateral groove. CONSTITUTION: Lateral grooves 6 are provided in one or plural stages in the circumferential direction on four places of the side wall surface of a lower tie plate 1, and further by-pass holes 7 passed through the lateral grooves 6 and the interior of the lower tie plate 1 are provided in the lateral grooves 6. The lateral grooves 6 are about 2mm wide, 2mm high, and 120mm long. The by-pass holes 7 have a diameter about 1.5mm, and about 10 by-pass holes are provided in one lateral groove 6. Thus, a confluence loss caused by mixing of a leakage flow from a channel box 2 with a by-pass flow from a by-pass hole 7 is produced. That is, a leakage flow can be restrained corresponding to the confluence loss by providing a confluence part in a clearance gap between the lower tie plate 1 and the channel box 2. The value of confluence loss can be changed by the flow ratio and the area ratio in the confluence part.

4. 发明专利

JPH05223968A FUEL BODY AND CHANNEL BOX 失效
公开(公告)号：JPH05223968A
公开(公告)日：1993-09-03
申请号：JP3037892
申请日：1992-02-18
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： YAMADA KATAHITO , AIZAWA YASUHIRO , KAWASHIMA NORIO , NAKAJIMA JUNJIRO , AOYAMA TADAO , NAKAMURA SHOZO , SUGANO SATOSHI , BESSHO TAISUKE , MIZUNO TADASHI , SAKATA SHINJI , TOKUNAGA KENSUKE
IPC分类号： G21C3/324
摘要： PURPOSE:To secure mechanical strength, to improve neutron economy and to flatten the output distribution of a fuel assembly in the axial direction by changing the average thickness so as to have required bending rigidity in response to the additive weighted distribution in the width direction of a fuel channel box at the time of earthquake. CONSTITUTION:In a fuel channel box 7, the thicknesses of a corner-part region 8a and a side-surface-part region 8b are made uniformly thick in a lower-end-part region 8 from the lower end. In an intermediate lower region 9, the thickness of a corner-part region 9a is made equal to the thickness of the region 8, and the thickness of a side- surface-part region 9b is made to be more than 60% and less than 80% of the region 9a. In an intermediate-upper-part region 10, the thickness of a corner-part region 10 is made equal to the region 8, and the thickness of a side-surface-part region 10b is made to be more than 50% and less than 75% of the thickness of the region 10a. The thickness of an upper-end-part region 11 is made equal to the thickness of the lower end-part region 8. Thus, the maximum deformation amount at the time of earthquake is controlled, and the flattening of the power distribution of the fuel assembly in the axial direction and the improvement in neutron economy can be achieved without preventing control-rod inserting property.

5. 发明专利

JPH05164870A FUEL SPACER 失效
公开(公告)号：JPH05164870A
公开(公告)日：1993-06-29
申请号：JP33370991
申请日：1991-12-17
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KANAMORI KENJI , NAKAJIMA JUNJIRO , UMEHARA HAJIME , IRIBE MAKOTO , AIZAWA YASUHIRO , NAKAMURA SHOZO , MIZUNO TADASHI , SUGANO SATOSHI
IPC分类号： G21C3/344
摘要： PURPOSE:To secure gaps between fuel rods and cells by giving recesses in the axial direction formed by projections to support the inserted fuel rods, to the peripheries of at least some cells, setting the peripheries of the neighboring cells to the recesses, and making the neighboring cells abut to the peripheries each other. CONSTITUTION:A fuel spacer 5 is composed by providing nemerous cylindrical sells 6 in a lattice form in a rectangular outer frame 30. In the assembling condition of the cells 6, fuel rods 2 are inserted in the cells 6, and they are held by two projections 7 and a spring 8 respectively. Furthermore, on the periphery of each cell 6, a recess 9 in the axial direction is formed by the projections 7, and the periphery 10 of the neighboring cell 6 is set to the recess 9, so as to compose the abutting part of the neighboring cells 6 each other. The projections 7 are formed at two positions of the cell 6 parting 90 deg., and by forming the recesses 9 and providing the cells 6 to abut to the recesses, they can be arranged in a square lattice form. In such a way, the diameter of the fuel rods 2 can be made larger, and the uranium loading amount can be increased about 3%.

6. 发明专利

JPS6137924A Uniform cooling method of tubular body 失效
标题翻译：管状体的均匀冷却方法
公开(公告)号：JPS6137924A
公开(公告)日：1986-02-22
申请号：JP15994084
申请日：1984-07-30
申请人： Hitachi Eng Co Ltd , Hitachi Ltd
发明人： NAKAJIMA JUNJIRO , MATSUMOTO TOSHIHIRO , KAWADA YOSHINARI , UMEHARA HAJIME , SAITO SOZO , ASANO RINICHI
IPC分类号： C21D9/08
摘要： PURPOSE: To cool uniformly inner surface of tubular body, by varying continuously flow rate of cooling medium in tube longitudinal direction to make heat transfer coefft. at each position in the tube constant, in flowing cooling medium to a cave part of tubular body in longitudinal direction.
CONSTITUTION: A core 2 in one body with cooling water outlet side support is inserted inside a blank tube 1, a cooling water inlet side support 3 is set being sealed by an insulator 4, and electrodes 5 are set. The outer diameter of the core 2 is varied in axis direction to vary the flow rate of cooling water, so that heat transfer coefft. between inner surface of the tube 1 and cooling water becomes constant in said tube longitudinal direction. Cooling water is allowed to flow through the cave part 6 in this state and if water quantity is stabilized, the tube 1 is heated by conducting electricity directly from the electrode 5. After a prescribed time, electricity conduction is stopped, the tube 1 is cooled by cooling water. In this way, uniform heat treatment in tube longitudinal direction can be carried out in a short time.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：为了冷却管体的内表面，通过在管纵向连续变化冷却介质的流量，使热传递系统。在管中的每个位置恒定，在流动的冷却介质中在纵向方向上到管状体的洞穴部分。构成：将一个具有冷却水出口侧支撑体的芯体2插入空管1内，将冷却水入口侧支撑件3设置为由绝缘体4密封，并且设置电极5。芯2的外径在轴线方向上变化，以改变冷却水的流量，从而使传热系统。在管1的内表面和冷却水的内表面在所述管纵向上变得恒定。在这种状态下，允许冷却水流过洞穴部分6，并且如果水量稳定，则通过直接从电极5传导电力来加热管1。在规定时间之后，停止导电，将管1冷却通过冷却水。以这种方式，可以在短时间内在管纵向方向上进行均匀的热处理。

7. 发明专利

JPH0829568A FUEL ASSEMBLY 失效
公开(公告)号：JPH0829568A
公开(公告)日：1996-02-02
申请号：JP16770094
申请日：1994-07-20
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KONUKI NORIHIKO , IMAI MASABUMI , NAKAJIMA JUNJIRO , YASUJIMA MASAKICHI , IZUTSU SADAYUKI
IPC分类号： G21C3/18 , G21C3/326
摘要： PURPOSE:To reduce the inner pressure of fuel rod while avoiding contact of a plenum spring with the outer circumferential part of fuel pellet and the inner surface of fuel cladding tube by eliminating a wafer at the upper part of the fuel pellet and bringing the plenum sprung into contact with the top face of the fuel pellet thereby increasing the spatial volume at the plenum part. CONSTITUTION:A plenum spring 9 is tapered conically at one end thereof on the side touching a fuel pellet 7 in order to prevent the spring 9 from touching the outer circumference of the pellet 7 and crackling. Furthermore, the most forward end part of the spring 9 is prevented from touching the inner ace of a fuel cladding tube 10 thus ensuring the mechanical soundness thereof. In this regard, an upper end plug 11 and the end part touching the pellet 7 are ground horizontally to increase the contact area thus enhancing the heat transmission performance and the mechanical soundness. Furthermore, the spring 9 on the pellet 7 side employs a tight contact structure of 4-12mm long forming a hollow tubular solid thus enhancing thermal neutron absorption of short fuel rod and reducing the output spike (output at the upper end of short fuel rod increases).

8. 发明专利

JPH07225292A FUEL SPACER, FUEL ASSEMBLY AND SPRING MEMBER FOR THE SAME SPACER 失效
公开(公告)号：JPH07225292A
公开(公告)日：1995-08-22
申请号：JP15853293
申请日：1993-06-29
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AIZAWA YASUHIRO , NAKAJIMA JUNJIRO , YASUJIMA MASAKICHI
IPC分类号： G21C3/33 , G21C3/344 , G21C3/356
摘要： PURPOSE:To improve assembling properties by easily manufacturing a looplike spring member while reducing a pressure loss and incorporating sufficient spring force and strength in the member in a fuel spacer for a fuel assembly. CONSTITUTION:A pair of leaf springs 32 of a looplike spring member 22 of a fuel spacer 4 for elastically supporting a water rod 3 are connected by a connector 33 of a structure opened in a direction of a coolant flow. A protrusion 34 to become a fulcrum of the spring and a protrusion 35 to become a force point of the spring are formed at the spring 32, the protrusions 34 are disposed at narrow parts 32b of both ends of the spring, and a length from an outer end of the connector to the protrusion 34 is 10-15% of the entire length of the member. The body 32a of the spring has the same width as that of the connector 33. The narrow part is narrower by about four times or more of a thickness of the connector.

9. 发明专利

JPH0735883A FUEL ASSEMBLY 失效
公开(公告)号：JPH0735883A
公开(公告)日：1995-02-07
申请号：JP17665093
申请日：1993-07-16
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： YAMADA KATAHITO , AIZAWA YASUHIRO , IMAI MASABUMI , NAKAJIMA JUNJIRO , YASUJIMA MASAKICHI
IPC分类号： G21C3/33
摘要： PURPOSE:To provide a fuel assembly in which generation of eutectic is suppressed without splitting the plate while allowing highly accurate bending work and high degree of burn-up is realized by increasing the number of fuel element grids. CONSTITUTION:A resilient supporting plate 15 has right and left bent side faces 15R, 15L which are spot welded at the edges thereof, i.e., welding points L1, L2 or R1, R2, to a round cell 8. Each of the bent side faces 15R, 15L is provided with two openings 16R, 16L at substantially same height as the plate contact part 13A of a spring member 13. Consequently, the plate contact part 13A is inserted, at the end thereof, into the opening 16L when the spring member 13 is shifted to the left and into the opening 16R when the spring member 13 is shifted to the right.

10. 发明专利

JPH04268488A FUEL ASSEMBLY 失效
公开(公告)号：JPH04268488A
公开(公告)日：1992-09-24
申请号：JP2978991
申请日：1991-02-25
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： YANAGI YOSHIHIKO , NAKAJIMA JUNJIRO , KANAMORI KENJI , UMEHARA HAJIME , AIZAWA YASUHIRO
IPC分类号： G21C3/324
摘要： PURPOSE:To improve the soundness and economics of a fuel assembly. CONSTITUTION:In a channel box 2, the thickness of a lower part 11 is uniform in the entire periphery, while the thickness of the corner part of an upper part is the same with that of the lower part 11, and the upper end of the lower part 11 is located at a height in the area of natural uranium 4 disposed in the lower part of fuel rods 3. The upper end 12 of the lower part 11 is above the upper surface of a lower tie plate 8 and the length of the lower part 11 is one to three times as large as the length of a fitting part of the channel box 2 and the lower tie plate 8. Accordingly, the amount of change in the flow rate of a coolant leaking out of the channel box 2 is reduced, effective use of neutrons is facilitated and further the mechanical strength of the channel box 2 is increased.

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