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1. 发明专利

JPH11174179A FUEL ASSEMBLY 失效
公开(公告)号：JPH11174179A
公开(公告)日：1999-07-02
申请号：JP34252797
申请日：1997-12-12
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SUZUKI TATSUO , TAKENAKA MASAO , IZUTSU SADAYUKI , KUROSAKI HIDEKI
IPC分类号： G21C3/328 , G21C3/326 , G21C3/62
摘要： PROBLEM TO BE SOLVED: To maintain an average uranium concentration and at the same time reduce a degree-of-reaction loss due to recovery uranium, by using the recovery uranium for a fuel pellet with the second largest uranium concentration in a fuel assembly in a fuel rod other than the fuel rod containing gadolinia out of the second-layer fuel rods from the outermost layer. SOLUTION: Two water rods 14 with a thick diameter are arranged at a central region. A short fuel rod P is arranged at four corners and at the center of four sides of the second layer from the outermost periphery. The short fuel rod P fills a fuel pellet into 1/24-15/24 region from the lower edge of the fuel effective length of the other long fuel rods. An average uranium concentration of a fuel assembly is approximately 3.7 wt.% and the long fuel rod has a natural uranium blanket region at upper and lower edges. In a fuel rod 2 and the short fuel rod P other than a fuel rod G containing gadolinia, a recovery uranium pellet is used for a fuel pellet B with the second-largest uranium concentration, the degree-of-reaction loss can be reduced while maintaining the average uranium concentration of the entire fuel assembly.

2. 发明专利

JPH102980A MANUFACTURE OF FUEL ASSEMBLY AND FUEL ASSEMBLY 失效
公开(公告)号：JPH102980A
公开(公告)日：1998-01-06
申请号：JP15259796
申请日：1996-06-13
申请人： HITACHI LTD
发明人： SASAGAWA MASARU , FUJIMAKI SHINGO , GOTO YUKINORI , KOKUBU TAKEHIKO , IZUTSU SADAYUKI , FUJITA SATOSHI
IPC分类号： G21C3/328 , G21C3/62
摘要： PROBLEM TO BE SOLVED: To facilitate setting of plutonium enrichment rate of each fuel rod in a method for manufacturing a fuel assembly using plutonium containing relatively little thermal fissionable Pu nuclide for an outside fuel rod by using plutonium containing much thermal fissionable Pu nuclide for a central side fuel rod. SOLUTION: When a predetermined amount of plutonium material substance is supplied from spent fuel, total average thermal fissionable plutonium composition ratio is detected. It is separated into high Puf composition group containing higher average thermal fissionable plutonium composition ratio and lower average thermal fissionable Puf composition group containing lower average ratio. These two groups of plutonium enrichment rates are decided in response to the equivalent fissile coefficient of mean of fuel assembly 11, and respectively charged in pellets of fuel rod 12 of number 1 at the central side of a lattice-like configuration and fuel rod 12 of numbers 2 to 4 of an outer peripheral side.

3. 发明专利

JPS5862582A BWR TYPE REACTOR 失效
公开(公告)号：JPS5862582A
公开(公告)日：1983-04-14
申请号：JP16023581
申请日：1981-10-09
申请人： HITACHI LTD
发明人： IZUTSU SADAYUKI
IPC分类号： G21C7/08 , G21C1/08 , G21C5/00 , G21C7/06

4. 发明专利

JPS56129888A FUEL LOADING 失效
公开(公告)号：JPS56129888A
公开(公告)日：1981-10-12
申请号：JP3277580
申请日：1980-03-17
申请人： HITACHI LTD
发明人： TAKAMATSU JIYUN , IZUTSU SADAYUKI
IPC分类号： G21C5/00 , G21C1/08 , G21C3/00

5. 发明专利

JPS5594186A REACTOR STABILITY MONITORING CONTROL DEVICE 失效
公开(公告)号：JPS5594186A
公开(公告)日：1980-07-17
申请号：JP133379
申请日：1979-01-12
申请人： HITACHI LTD
发明人： IZUTSU SADAYUKI , NAKAMURA SHIROU
IPC分类号： G21C17/00 , G21C7/00

6. 发明专利

JP2001056388A MOX FUEL ASSEMBLY 失效
公开(公告)号：JP2001056388A
公开(公告)日：2001-02-27
申请号：JP23355299
申请日：1999-08-20
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： SASAGAWA MASARU , KOKUBU TAKEHIKO , FUJIMAKI SHINGO , IZUTSU SADAYUKI
IPC分类号： G21C3/328 , G21C3/326
摘要： PROBLEM TO BE SOLVED: To prevent the increase of absolute value of void reactivity coefficient and reduction of neutron absorption effect of flammable poison and average axial power distribution by suppressing the increase of reactivity loss and the local power peaking of fuel rods adjacent to short size fuel rods and 4 corners position fuel rods for raising burnup. SOLUTION: In a MOX fuel assembly arranging MOX fuel rods 2 (denoted 1 to 4) charge with plutonium oxide and uranium oxide and fuel rods (denoted 5 to 6) with uranium including gadolinia containing burnable poison in charged uranium oxide in matrix of 9×9 square grid, short size MOX fuel rods 2 (denoted 4) having shorter fuel effective length than the others arranged in grid position other than the grid position adjacent to the 4 corners of square grid array among outermost part of the square grid array, and uranium fuel rods 2 (denoted 6) with gadolinia arranged in the outermost part of the square grid array are provided.

7. 发明专利

JP2000193773A FUEL ASSEMBLY 失效
公开(公告)号：JP2000193773A
公开(公告)日：2000-07-14
申请号：JP37281398
申请日：1998-12-28
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： MIYA KAZUHISA , SUZUKI TATSUO , IZUTSU SADAYUKI , FUJIMAKI SHINGO
IPC分类号： G21C3/328 , G21C3/326
摘要： PROBLEM TO BE SOLVED: To improve the ratio recovered uranium used in a fuel assembly by using the recovered uranium obtained through the reprocessing of a used fuel for a fuel pellet containing a burnable poison such as gadolinia in the fuel assembly. SOLUTION: A fuel assembly has a natural uranium blanket at upper and lower ends. Fuel pellets of the highest enrichment are used for A in the enrichment distribution of fuel rods 11 and, after A, the enrichment of fuel pellets in descending order is: B, C, D and E. Types of a fuel are classified into 1 to 5 according to the difference of the enrichment distribution of each fuel rod. A type P of fuel rods are short fuel rods and a type G of them are fuel rods of gadolinia, a burnable poison. The fuel assembly also has water rods 16. If recovered uranium is used only for the gadolinia fuel rods, the ratio of the used recovered uranium in volume is about 15%. Moreover, all fuel rods are made of recovered uranium by using it for all other uranium fuel pellets and the ratio of the used recovered uranium in volume can be set at 100%.

8. 发明专利

JP2000046978A FUEL ASSEMBLY 失效
公开(公告)号：JP2000046978A
公开(公告)日：2000-02-18
申请号：JP21512698
申请日：1998-07-30
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： IZUTSU SADAYUKI , SASAGAWA MASARU , DOMOTO NOBORU
IPC分类号： G21C3/324 , G21C3/326 , G21C3/328 , G21C3/62
摘要： PROBLEM TO BE SOLVED: To increase an MOX loading rate and flatten a local output peaking by appropriately setting the degree of enrichment of fuel and the arrangement relationship of a flammable toxic substance in a zirconium group alloy without mixing the flammable toxic substance to a fuel pellet. SOLUTION: In a channel box 13, a gadolinium member 20 is buried to the four corner parts of the channel box with a zirconium group alloy material as a base material. The gadolinium member 20 is buried at eight locations being limited to an area near the corner fuel rod out of the fuel rods at the outermost layer of a fuel assembly and an area near the adjacent fuel rod. Also, gadolinia with a gadolina concentration are uniformly buried at a position corresponding to the fuel effective part of the fuel rod of continuous length in the axial direction. In this manner, the entire number of types of degree of enrichment is set to one and the degree of enrichment of the fuel rod of short length is allowed to coincide with that of the fuel rod of continuous length. An MOX loading rate can be increased since no gadolinia are mixed into the fuel rod and the gadolinia member 20 can be flattened since it is limitedly buried to the corner.

9. 发明专利

JPH04128691A REACTOR CONTROL ROD 失效
公开(公告)号：JPH04128691A
公开(公告)日：1992-04-30
申请号：JP24752290
申请日：1990-09-19
申请人： HITACHI LTD
发明人： IZUTSU SADAYUKI , YOSHIMOTO YUICHIRO , YAMAUCHI KOKI
IPC分类号： G21C7/10 , G21C7/113
摘要： PURPOSE:To increase control rod value by providing grooves on plates, and joining the two structural materials or the plates to each other. CONSTITUTION:The blade part of a control rod consists of filling holes to be filled with neutron absorbers 1 and structural materials or plates 7. In this manufacturing method, the two plates with the thickness of one-half the thickness of the blade part are used. In this case, the longitudinal length of the plates can be equalized to the effective length of the blade part. The peripheral parts of the plates are welded. The two plates are joined to each other to form filling holes. The peripheral parts of the plates are welded. The filling holes are filled with neutron absorbers, namely, B4C powder or B4C pellets, and sealed by end plugs. When the thickness of the blade is about 7mm and 18 filling holes about 25mm in diameter are provided for each blade, the volume- ratio of B4C reaches about 50%, and when Hf is used as material of the plates 7, the effectiveness of improving control rod value is raised up to about 20% compared to the conventional type.

10. 发明专利

JPS62273489A NUCLEAR REACTOR 失效
公开(公告)号：JPS62273489A
公开(公告)日：1987-11-27
申请号：JP11460986
申请日：1986-05-21
申请人： HITACHI LTD
发明人： FUKAZAWA YUKIHISA , YAMASHITA JUNICHI , IZUTSU SADAYUKI , SHIMOJU TAKANORI
IPC分类号： G21C7/10 , G21C7/26 , G21C7/27

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