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1. 发明专利

JPS60117182A FUEL AGGREGATE FOR BOILING-WATER TYPE REACTOR 失效
公开(公告)号：JPS60117182A
公开(公告)日：1985-06-24
申请号：JP22613383
申请日：1983-11-30
申请人： TOSHIBA KK , NIPPON ATOMIC IND GROUP CO
发明人： YOSHIOKA RITSUO , NAGANO MAMORU , HIDA KAZUTAKA
IPC分类号： G21C3/328 , G21C3/30

2. 发明专利

JPS6071987A METHOD OF OPERATING BOILING-WATER REACTOR 失效
公开(公告)号：JPS6071987A
公开(公告)日：1985-04-23
申请号：JP18151683
申请日：1983-09-29
申请人： TOSHIBA KK , NIPPON ATOMIC IND GROUP CO
发明人： YOSHIOKA RITSUO , WATANABE SHIYOUICHI , ISHIDA HIROMI
IPC分类号： G21C7/00 , G21C5/00 , G21D3/00

3. 发明专利

JPH01253693A FUEL ASSEMBLY 失效
公开(公告)号：JPH01253693A
公开(公告)日：1989-10-09
申请号：JP7808088
申请日：1988-04-01
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： ANDO RYOHEI , UEDA KIYOSHI , YOSHIOKA RITSUO
IPC分类号： G21C3/328 , G21C3/30
摘要： PURPOSE:To increase a control rod value at a cold temperature, by decreasing a fissile material enrichment of fuel rods mainly facing water gaps at the side where control rods are not inserted, rather than a fissile material enrichment of the other region in a reactor core. CONSTITUTION:An average enrichment of the first layer fuel rods 6, 7, 8, 9, 10, 11, 12, 13 and 14 which face water gaps of the subject fuel assembly, is less than an average enrichment of whole fuel rods, however, in the first layer fuel rods, an average enrichment of fuel rods 6, 7, 8 and 9 which are locate at the side where fuel rods are inserted, is set to be greater than an average enrichment of fuel rods 10, 11, 12 and 14 which are located at the side where fuel rods are not inserted. When a case in which a enrichment distribution in a fuel assembly is set, is considered to be a reference, control rod values at a cold temperature in the cases 1 and 2, are intended to be increased than the reference one.

4. 发明专利

JPH01202691A NUCLEAR REACTOR CONTROL ROD 失效
公开(公告)号：JPH01202691A
公开(公告)日：1989-08-15
申请号：JP2841888
申请日：1988-02-09
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： YOSHIOKA RITSUO , UEDA KIYOSHI , SAKURANAGA TOMONOBU
IPC分类号： G21C7/10 , G21C7/113 , G21C7/24
摘要： PURPOSE:To plan light weight and the like by forming a wing of dilute alloy in which a long-lived neutron absorber such as hafnium is diluted with diluent such as zirconium and titanium and filling housing holes drilled in the dilute alloy with the neutron absorber. CONSTITUTION:The captioned control rod 1 is connected to the inside end of a plurality of rectangular wings 3 in a crosswise shape through a plurality of connecting members 2 provided at the prescribed intervals axially. Further, the wing 3 is formed of dilute alloy in which a long-lived neutron absorber such as hafnium is diluted by light weight diluent such as zirconium and drilled housing holes 4 are filled with the neutron absorber. Therefore, the wings 3 are formed of solid solution, and a physically and chemically stable light weight control rod is obtained while reactivity value is heightened by complementary neutron absorptive effect of the long-lived neutron absorber and a neutron absorber and nuclear life-time can be extended.

5. 发明专利

JPH01189591A FUEL ASSEMBLY 失效
公开(公告)号：JPH01189591A
公开(公告)日：1989-07-28
申请号：JP1187288
申请日：1988-01-23
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： UEDA KIYOSHI , SAKURAI SHUNGO , YOSHIOKA RITSUO
IPC分类号： G21C3/28 , G21C3/30 , G21C3/32 , G21C3/326 , G21C3/328 , G21C3/334
摘要： PURPOSE:To increase a subcriticality of a nuclear reactor during a reactor shut down, by inserting inclusions of a certain constant length having a significantly degraded concentration of fissile nuclides into a part of fuel rods and by arranging the fuel rods having the inclusions in an outside region of a fuel assembly. CONSTITUTION:A fuel rod having an inclusion 31 is formed so as to an appropriate length of the inclusion to be less than 1/3H and a height of the inclusion at its center to be around 3/4H from the lowest end of an effective length of the fuel. The reason is that a subcriticality is especially shallow in a range of around 1/4H at a height of around 3/4H. Moreover, for prevention of an output spike, an output spike suppressor 36a is inserted next to the inclusion 36, and in case of a boiling water nuclear reactor, the fuel rods 31 are arranged in this surface for the purpose of utilization of an subcriticality increasing phenomenon which the fuel rods 31 have, mainly for the side where control rods are not inserted, and water gaps between adjacent fuel assemblies are expanded, and consequently, a subcriticality of a reactor during its shut down can be increased.

6. 发明专利

JPH01148998A CONTROL ROD FOR NUCLEAR REACTOR 失效
公开(公告)号：JPH01148998A
公开(公告)日：1989-06-12
申请号：JP30895587
申请日：1987-12-07
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： UEDA KIYOSHI , YOSHIOKA RITSUO
IPC分类号： G21C7/10
摘要： PURPOSE:To heighten the reactivity value of a control rod and enlarge a reactor stop margin while planning a long term of nuclear life by applying a long life type neutron absorber to a U-shaped sheath and arranging many neutron absorbers at the part of high reactivity effect. CONSTITUTION:An edge structure material 11 and an end structure material 12 are joined by the use of a tie rod 13 and a U-shaped sheath 15 is anchor on the tie rod 13, the edge structure material 11 and the end structure material 12 to form a plurality of wings 16. The sheath 15 of the wings 16 is formed of a long life type neutron absorber composed of hafnium metal or alloy whose main constituent is hafnium. Further, the area of the inserting end side neighboring to the inserting edge area of the wing 4 is formed so that the total quantity of the neutron absorber is gradually reduced toward the inserting end side in the longitudinal direction. Water which is moderator is introduced in the inner part of the sheath 15, neutrons are moderated by the water, neutron absorbing effect, namely, the reactivity effect of a control rod is enlarged because of the neutrons of absorbable energy.

7. 发明专利

JPS6423194A FUEL ASSEMBLY 失效
公开(公告)号：JPS6423194A
公开(公告)日：1989-01-25
申请号：JP17819087
申请日：1987-07-18
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： UEDA KIYOSHI , SAKURAI SHUNGO , YOSHIOKA RITSUO
IPC分类号： G21C3/328 , G21C3/28 , G21C3/30 , G21C3/32 , G21C3/326 , G21C3/334
摘要： PURPOSE:To obtain a fuel assembly which allows the shut-down of a nuclear reactor in spite of increasing the enrichment of fuel and is improved in an axial power distribution by disposing fuel rods inserted with interposing members into the fuel assembly to intersected straight line shapes, etc. CONSTITUTION:A square water rod 32 is disposed at the center in this case and 9 lines and 9 rows of the fuel rods 30, 31 are regularly disposed except this central part. The outside thereof is enclosed by a channel box 33 and further, the top and bottom ends thereof are fixed respectively by an upper tie plate 34 and a lower tie plate 35. The fuel rods 31 are the fuel rods P inserted with the interposing members. The suitable length l of the interposing members 36 is

8. 发明专利

JPS5950387A Fuel assembly 失效
公开(公告)号：JPS5950387A
公开(公告)日：1984-03-23
申请号：JP16036082
申请日：1982-09-14
申请人： Tokyo Shibaura Electric Co , Nippon Atomic Ind Group Co
发明人： YOSHIOKA RITSUO , HIDA KAZUTAKA
IPC分类号： G21C3/28 , G21C3/32 , G21C3/328
CPC分类号： Y02E30/38

9. 发明专利

JPS5855888A CONTROL ROD OF REACTOR 失效
公开(公告)号：JPS5855888A
公开(公告)日：1983-04-02
申请号：JP15529181
申请日：1981-09-30
申请人： NIPPON ATOMIC IND GROUP CO , TOKYO SHIBAURA ELECTRIC CO
发明人： MIZUTA HIROSHI , UEDA KIYOSHI , KUSUNO SADAO , YOSHIOKA RITSUO
IPC分类号： G21C7/24 , G21C7/10

10. 发明专利

JPS5531922A OPTINUM AJUSTMENT METHOD OF NUCLEAR FUEL 失效
公开(公告)号：JPS5531922A
公开(公告)日：1980-03-06
申请号：JP10490678
申请日：1978-08-30
申请人： TOKYO SHIBAURA ELECTRIC CO , NIPPON ATOMIC IND GROUP CO
发明人： YOSHIOKA RITSUO , TANABE AKIRA , KIYONO TAKESHI
IPC分类号： G21C7/00 , G21D3/00 , G21D3/12 , G21D7/00

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