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    • 2. 发明专利
    • REACTOR CORE SUPPORT DEVICE OF SODIUM COOLING TYPE FAST NEUTRON REACTOR
    • JP2000227489A
    • 2000-08-15
    • JP2862499
    • 1999-02-05
    • JAPAN NUCLEAR CYCLE DEV INSTFUJI ELECTRIC CO LTD
    • TOZAWA KATSUHIROHIROKI ATSUSHIOZAKI HIROSHI
    • G21C5/10G21C3/28G21C3/322G21C3/33G21C5/08G21C15/02
    • PROBLEM TO BE SOLVED: To obtain a reactor core support device for restricting so that an invalid flow of a primary coolant for damaging reactor core cooling performance is reduced by shortening a gap between reactor core forming elements at the time of a reactor operation, and that the gap is widened up to a range required for a fuel replacement work at the time of fuel replacement, relative to 'the open type reactor core' of a ductless type fuel assembly. SOLUTION: Vertical and horizontal loads of a reactor core are supported allottedly by a lower-part reactor core support structure combined with a constraining band and a side-part reactor core support structure. The lower-part reactor core support structure 8 is composed of connecting tubes 16 arranged dispersedly on core support plates 8b, 8c for supporting uprightly reactor core forming elements 15 respectively, and the constraining band 17 for constraining a bundle of the connecting tubes 16 from the circumferential side. The connecting tubes 16 are formed by having external shapes of hexagons and having key ways 16a on the peripheral faces, and fitted loosely with the core support plates 8b, 8c, and connected mutually so as to constrain each other. Besides, the bundle of the connecting tubes 16 is constrained from the circumferential side by the constraining band 17 having an equivalent thermal expansion coefficient adjusted beforehand so as to be smaller than the thermal expansion coefficient of the reactor core forming elements 15 through a load transmitting block 18 and a presser plate 19.
    • 6. 发明专利
    • OFFSET ARM TYPE FUEL CHANGER FOR NUCLEAR REACTOR
    • JPH01174997A
    • 1989-07-11
    • JP33538687
    • 1987-12-29
    • FUJI ELECTRIC CO LTD
    • OZAKI HIROSHI
    • G21C19/19B25J17/00F16H21/10
    • PURPOSE:To achieve a compactization, by forming flanges at both ends of each arm plate in such a manner as to extends on the opposite side each other with a reinforcing rib plate as border and coupled to a expansion driving mechanism and a hold down tube separately on the side of the body shell. CONSTITUTION:When an offset arm 5 extends horizontally to fold the arm 5 at a fuel change position where a hold down tube 6 is pulled out to the side of a body shell 4, on the side of the body shell 4, a ball screw 9 and a boss 10 as arm expansion driving mechanism are housed in a U-shaped groove formed between a reinforcing rib plate 53 and right and left arm plates 51 and 52 on the side of a flange 54 at the arm 5 and one tube 6 is housed in a U-shaped groove on the side of a flange 55 formed on the opposite side separated with the rib plate 53. That is, in the folding of the arm 5, the tube 6 and the arm 5 are pulled sufficiently without interference to be housed almost in the body shell 4. This enables compact housing so as to reduce the shaft diameter dimensions of a fuel changer as a whole in this states.
    • 7. 发明专利
    • FUEL EXCHANGING AND HANDLING DEVICE OF FAST BREEDER REACTOR
    • JPH04110700A
    • 1992-04-13
    • JP22892090
    • 1990-08-30
    • FUJI ELECTRIC CO LTD
    • OZAKI HIROSHI
    • G21C19/19
    • PURPOSE:To make a diameter of nuclear reactor vessel much compact by transferring spent fuels to a fuel bringing-out position inside the reactor from an incore fuel storage rack and also by bringing out the fuel to outside the reactor by a fuel handling machine. CONSTITUTION:During shut down period of the nuclear reactor, spent fuels are brought out of a reactor core 5 via an upper structure 6 of reactor core and a telescopic arm typed fuel exchanging machine 1, in order to move the fuels to an incore fuel storage rack 2, and also new fuels stored in the incore fuel storage rack 2, are brought out of the incore fuel storage rack 2 via the telescopic arm typed fuel exchanging machine 1 and the upper structure 6 of reactor core, in order to insert the new fuels into the reactor core 5. The spent fuels that are transferred from the reactor core 5 to the incore fuel storage rack 2 during the shut down period of the fast breeder reactor, are transferred again from the incore fuel storage rack 2 to a fuel bringing-out position 11 inside the reactor, from the incore fuel storage rack 2, by the telescopic arm typed fuel exchanging machine 1, and then are brought out to outside the reactor by a fuel handling machine 10. The fuel handling machine 10 also transfers the new fuels to an incore fuel bringing-out position 14 from the incore fuel storage rack 2 and the telescopic arm typed fuel exchanging machine 1 transfers the new fuels to the incore fuel storage rack 2.