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41. 发明专利

JPH0580170A FUEL ASSEMBLY 失效
公开(公告)号：JPH0580170A
公开(公告)日：1993-04-02
申请号：JP24167491
申请日：1991-09-20
申请人： HITACHI LTD
发明人： INAGAKI MASATOSHI , SUGANO MASAYOSHI , HIRAKAWA HIROMASA , ISHIZAKI HIDEAKI , YAMAMOTO SHINPEI , MAKI HIDEO , NAKAJIMA JUNJIRO , NAKAMURA SHOZO , SUGANO SATOSHI
IPC分类号： C22F1/18 , G21C3/06 , G21C3/07 , G21C3/30 , G21C3/324 , G21C3/326 , G21C3/34
摘要： PURPOSE:To provide high burn-up adaptivity by arranging random the crystal axis of a channel box, using high Fe-Ni type zirconium-based alloy with high anti-corrosiveness to this and covering tube/spacer constituent material, and subjecting it to quenching in alpha+beta or beta phase. CONSTITUTION:A covering tube is so constructed that its solid solution amount of Sn, Fe, Ni at the outer surface is higher than that at the inner surface, and a channel box 4 is constructed so that its orientation factor (Fr value) of (0001) crystal axis in the direction across the plate thickness ranges 0.25-0.50. The covering tube, spacer 7, and box 4 are formed from 1-2wt.% Sn, 0.20-0.35wt.% Fe, 0.03-0.16wt.% Ni, and the remainder which consists substantially of zirconium. Heating of the box 4 into the beta-phase region is made for a certain desired time continuously while the plate is moved. This causes the (0001) axis to be random and provides high anti-corrosiveness to high temp, high pressure pure water. Thereby the high burn-up adaptivity is made practicable.

42. 发明专利

JPH0511083A FUEL CHANNEL 失效
公开(公告)号：JPH0511083A
公开(公告)日：1993-01-19
申请号：JP16422591
申请日：1991-07-04
申请人： HITACHI LTD
发明人： NAGASHIMA HIDEAKI , HAYASAKA YASUSHI , HIRAKAWA HIROMASA , SAKUMA TORAYOSHI
IPC分类号： G21C3/324
摘要： PURPOSE:To increase the buckling stiffness of fuel channel, improve seismic stiffness and improve thermal-hydraulic and nuclear characteristics by reducing the thickness. CONSTITUTION:On a fuel channel 4 with a square cross section in which fuel bundle consisting of a multitude of fuel rods and a plurality of spacers to hold the fuel rods are inserted, a thick parts 5 are provided in the center of the four surfaces of the channel 4 along the length. By this configuration, seismic stiffness, thermal-hydraulic and nuclear characteristics are improved.

43. 发明专利

JPH02136785A FUEL ASSEMBLY 失效
公开(公告)号：JPH02136785A
公开(公告)日：1990-05-25
申请号：JP29082588
申请日：1988-11-17
申请人： HITACHI LTD
发明人： YANAGI YOSHIHIKO , HIRAKAWA HIROMASA , KAWADA YOSHINARI , NAKAJIMA JUNJIRO , NAKAMURA SHOZO , MIZUNO TADASHI
IPC分类号： G21C3/33 , G21C3/322 , G21C3/326
摘要： PURPOSE:To prevent the concentration of cooling water around large-diameter water rods by forming the 1st, 2nd apertures for cooling water passage of a lower tie plate in such a manner that the coefft. of pressure drop in the 1st apertures is larger than the coefft. of pressure drop in the 2nd apertures. CONSTITUTION:The plural apertures 34b for passing the cooling water between the large-diameter water rods 22 and 23 formed in a 1st region 33b around the large-diameter water rods 22, 23 of the lower tie plate 25 are designated as the 1st apertures for the cooling water passage and the plural apertures 34a formed in a 2nd region 33a around fuel rods 21 of the lower tie plate 25 are designated as the 2nd apertures for cooling water passage. The 1st and 2nd apertures for cooling water passage are then so formed that the coefft. of pressure drop in the 1st apertures for cooling water passage is larger than the coefft. of pressure drop in the 2nd apertures for cooling water passage. The pressure drop viewed in the axial line direction of the fuel assembly is balanced between the water rods and the fuel rods as well as between the fuel rods and the concentration of the cooling water around the central water rods is prevented. The thermal stability of the peripheral fuel rods is thus improved.

44. 发明专利

JPH01276095A FUEL ASSEMBLY 失效
公开(公告)号：JPH01276095A
公开(公告)日：1989-11-06
申请号：JP10394888
申请日：1988-04-28
申请人： HITACHI LTD
发明人： YANAGI YOSHIHIKO , HIRAKAWA HIROMASA , KAWADA YOSHINARI , NAKAJIMA JUNJIRO , TADA NOBUO , NAKAMURA SHOZO , MIZUNO TADASHI
IPC分类号： G21C3/10 , G21C3/18 , G21C3/30 , G21C3/326 , G21C3/328 , G21C3/34
摘要： PURPOSE:To decrease the oscillation amplitude at the top end of a short-sized fuel rod and to lessen the fretting corrosion of a fuel spacer which supports the top end of the short-sized fuel rod by specifying the ratio of the length DELTAlbetween the fuel rod supporting part of the spacer and the top end of the short-sized fuel rod and the length lM between the fuel rod supporting parts of the fuel spacer. CONSTITUTION:The short-sized fuel rod 10 which is mounted at the bottom end to a lower tie plate 15 is axially supported by 5 pieces of the fuel spacers; the 1st spacer A, the 2nd spacer B, the 3rd spacer C, the 4th spacer D, and the 5th spacer E. The oscillation amplitude ratio (deltaE/deltaM) increases sharply when the projection length R (=DELTAl/lM) of the fuel rod 10 from the 5th spacer E is larger than 1/4. The fretting corrosion of the 5th spacer E can be decreased down to about the same level as the fretting corrosion of the other spacers simply by adjusting the oscillation amplitude ratio (deltaE/deltaM) to

45. 发明专利

JPH01212394A FUEL ASSEMBLY 失效
公开(公告)号：JPH01212394A
公开(公告)日：1989-08-25
申请号：JP3527188
申请日：1988-02-19
申请人： HITACHI LTD
发明人： NAKAJIMA AKIYOSHI , BESSHO TAISUKE , ISHII YOSHIHIKO , AOYAMA TADAO , HIRAKAWA HIROMASA , KOYAMA JUNICHI , UCHIKAWA SADAO , OZAWA MICHIHIRO
IPC分类号： G21C3/344 , G21C3/33 , G21C3/34
摘要： PURPOSE:To enlarge the lateral cross section of a saturated water region in which a water rod occupies by forming a projection part with which the water rod comes in contact in a part of components of a cylindrical member in the neighborhood of the water rod. CONSTITUTION:A round cell 10 for supporting a water rod is composed of a cylindrical member 11 and a U-shaped notch 12 for mounting plate spring 15 for holding a fuel rod 20 is provided on the member 11. Further, a projection part 13 for holding the fuel rod 20 is provided toward the inside thereof on the round cell 10 and the fuel rod 20 is held by two projection parts 13 and the plate spring 15. Further, another projection part 14 at which the member 11 forming the round cell 11 is deformed to form and turned toward the outside is provided on the round cell 10 and placed on both side of the round cell 10 one by one. Therefore, since a saturated water region in a fuel assembly can largely be ensured and the moderating effect of a center part of the fuel assembly can be heightened, the fuel profitability of the fuel assembly can be improved.

46. 发明专利

JPH01132989A FUEL ASSEMBLY 失效
公开(公告)号：JPH01132989A
公开(公告)日：1989-05-25
申请号：JP28934987
申请日：1987-11-18
申请人： HITACHI LTD
发明人： NAKAMURA MITSUYA , OZAWA MICHIHIRO , YAMASHITA JUNICHI , HIRAKAWA HIROMASA
IPC分类号： G21C3/326 , G21C3/32 , G21C3/34 , G21C3/344
摘要： PURPOSE:To improve fuel economy while simplifying the holding of a fuel and easing the manufacture of a water rod by forming the lateral sectional form of one of two water rods adjacently arranged of two circular arcs. CONSTITUTION:An upper and a lower tie plates hold the upper and the lower end parts of fuel rods 2. Seventy four fuel rods 2 are arranged on 9 longitudinal lines to 9 lateral lines and intervals are held by fuel spacers. Two water rods 6, 7 are arranged on a diagonal line which connects the corner part Y1 of a fuel assembly 1 and the corner part Y2 facing thereto. The lateral sectional form of water rod 6 is made in a circle of radius of R1 (a half of diameter of the water rod 6). The water rod 6 is formed of two circular arcs in lateral sectional form, namely, made in circular arc forms A1, A2, the circular arc A2 of shorter length penetrating the center of the A1. Therefore, the holding of the fuel spacers by the water rods can easily be performed while the whole lateral sectional area of the water rod arranged in the central part of its lateral sectional area is enlarged and the fuel economy can be improved.

47. 发明专利

JPS6488196A AUTOMATIC SPRING LOADER OF FUEL ASSEMBLY FOR NUCLEAR REACTOR 失效
公开(公告)号：JPS6488196A
公开(公告)日：1989-04-03
申请号：JP24379787
申请日：1987-09-30
申请人： HITACHI LTD , HITACHI SETSUBI ENG KK , NIPPON NUCLEAR FUELS
发明人： HIRAKAWA HIROMASA , ODAKURA TOMIO , SEKINE TAKASHI
IPC分类号： G21C21/00 , G21C21/02
摘要： PURPOSE:To remotely and automatically load springs to a fuel rod by providing a fuel rod gripping mechanism which grips and fixes the fuel rod in a horizontal state and providing a supplying means which supplies the spring and conveying mechanism which takes out and conveys the spring. CONSTITUTION:The fuel rod 106 is gripped by the fuel rod gripping mechanism 1 and is conveyed by a parts feeder 5. The spring 106 positioned by a stopper 5a is gripped by a clamp 6d of the spring conveying mechanism 6. The spring 106 is guided by straight guides 6b and 6c and is conveyed to the position of a spring direction discriminating mechanism 7 when the conveying mechanism 6 drives air cylinders 6f and 6g. Whether the bent end of the spring and the insertion direction of the spring coincide or not is checked at this time and thereafter, the spring conveying mechanism 6 supplies the spring 106 to a supporting base 4b of a spring gripping and inserting mechanism 4. The spring is then inserted to an end plug 107 in the upper part of the fuel rod by moving the spring gripping and inserting mechanism 4.

48. 发明专利

JPS63249095A FUEL AGGREGATE 失效
公开(公告)号：JPS63249095A
公开(公告)日：1988-10-17
申请号：JP8290887
申请日：1987-04-06
申请人： HITACHI LTD
发明人： NAGASHIMA HIDEAKI , KAWADA YOSHINARI , HIRAKAWA HIROMASA , HASEGAWA KUNIO , SUGANO SATOSHI , NAKAMURA SHOZO , SHIOHATA HIRONORI
IPC分类号： G21C3/33 , G21C3/30 , G21C3/324

49. 发明专利

JPS6312548B2 失效
公开(公告)号：JPS6312548B2
公开(公告)日：1988-03-19
申请号：JP12077381
申请日：1981-08-03
申请人： HITACHI LTD
发明人： SHINHO KATSUTOSHI , HIRAKAWA HIROMASA , KAWAHARA AKIRA
IPC分类号： G21C3/00 , G21C3/06 , G21C3/32 , G21C3/33

50. 发明专利

JPS6249947B2 失效
公开(公告)号：JPS6249947B2
公开(公告)日：1987-10-22
申请号：JP1532780
申请日：1980-02-08
申请人： HITACHI LTD
发明人： HIRAKAWA HIROMASA
IPC分类号： G21C3/00 , G21C3/332 , G21C3/34

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