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1. 发明专利

JPH02221894A CONTROL ROD DRIVING DEVICE 失效
公开(公告)号：JPH02221894A
公开(公告)日：1990-09-04
申请号：JP4095889
申请日：1989-02-21
申请人： MITSUBISHI ATOMIC POWER IND
发明人： IMAYOSHI SHO , HIROTA KOICHI , NAKAI KOICHI
IPC分类号： G21C7/14
摘要： PURPOSE:To enable the ball screw and split ball nut of a driving shaft to properly engage each other by providing an absolute position detector for the driving shaft, and an absolute angle detector and a synchronous position setter for a rotor. CONSTITUTION:The absolute position detector 12 which detects the absolute position of the driving shaft 3 and the absolute angle detector 13 which detects the angle of rotation of the rotor 21 are connected to the synchronous position setter 30. The setter 30 is connected to the rotor 21 of a synchronous motor through a motor controller 31. The detector 12 detects how much the driving shaft 3 moves from a reference position and the detector 13 detects the current azimuth of the rotor 21. Then the setter 30 sets the angle of rotation of the ball nut up to the synchronous position according to the signals from the detectors 12 and 13 and supplies a command to the controller 31 to rotate the rotor, thereby determining the azimuth of the ball nut. In this state, an electromagnet is magnetized and the split ball nut and ball screw properly engage each other.

2. 发明专利

JPH05323082A CONTROL ROD FOR FAST BREEDER REACTOR 失效
公开(公告)号：JPH05323082A
公开(公告)日：1993-12-07
申请号：JP15421592
申请日：1992-05-22
申请人： MITSUBISHI ATOMIC POWER IND
发明人： NAKAI KOICHI
IPC分类号： G21C7/14
摘要： PURPOSE:To surely suppress the core reactivity of a fast breeder reactor. CONSTITUTION:A pin 15 of an extension link mechanism 10 joints with a cum groove 14 provided on a cum unit 9 and the cam unit 9 is moved up and down by the thermal expansion difference between a temperature sensing cylinder 7 and a low thermal expansion rod 8, and thus the length of the extension link mechanism 10 is varied. A thermal resister 16 made of such steel as Inconel 625 and the like having small heat conductance is placed in the inner periphery of the temperature sensing cylinder 7, which delays the heat conduction to the cum unit support rod 8 at this moment. During a slow coolant temperature rise like in normal startup, the temperatures are the same between the temperature sensing cylinder 7 and the cum unit support rod 8 and thermal expansion difference does not occur. During a rapid coolant temperature rise, the heat conduction to the cum unit support rod 8 is delayed by the heat resister 16 and thus, temperature difference is caused between the temperature sensing cylinder 7 and the cum unit support rod 8, which extends the extension link mechanism 10. The shape of the cum groove 14 is set so that the extension mechanism 10 does not extends until the normal operation temperature and it extends beyond the normal operation temperature.

3. 发明专利

JPH0476274A SHAPE MEMORY SPRING 失效
公开(公告)号：JPH0476274A
公开(公告)日：1992-03-11
申请号：JP18822990
申请日：1990-07-17
申请人： MITSUBISHI ATOMIC POWER IND
发明人： IMAYOSHI SHO , ISHIKURA SHUICHI , NAKAI KOICHI
IPC分类号： F03G7/06 , C22C19/03
摘要： PURPOSE:To obtain a spring having a large resilency and good temperature response by employing a shape memory spring of honeycomb-like or laminated corrugated sheets cross-section as a shape memory spring. CONSTITUTION:With a honeycomb-like shape memory spring 1, a thin plate 2 made of shape memory alloy, for example, up to 1 mm thick is formed into an element of specified shape, and a plurality of these elements are laminated and joined to form a honeycomb construction as a whole. In a figure for illustrat ing expansion and contraction of the shape memory spring at the time when the temperature is changed, when a transition temperature is reached the shape memory spring 1 expands and contracts in the direction of expansion and con traction (vertically in figure) by the quantity S of expansion and contraction, and the length of L is laterally changed to become L' (where L

4. 发明专利

JPH06242285A CONTROL ROD POSITION DETECTOR 失效
公开(公告)号：JPH06242285A
公开(公告)日：1994-09-02
申请号：JP5021693
申请日：1993-02-16
申请人： MITSUBISHI ATOMIC POWER IND
发明人： NAKAI KOICHI
IPC分类号： G01D5/12 , G21C17/10
摘要： PURPOSE:To provide a detector for continuously detecting the position of a control rod over its whole stroke in a control rod driving mechanism. CONSTITUTION:For a detector, a noncontact displacement sensor 15 is used. The displacement sensor 15 is fixed to a housing 5a and a sensor probe 15a consisting of magnetic distortion lines extends downward to a control rod drive axis 19. On the other hand from a control rod 6, a position detection rod 13 penetrates the control rod drive axis 19 and extends upward, and at its upper end, a magnet 14 is placed. The position detection rod 13 and the sensor probe 15a have an overlap equivalent to the stroke of the control rod so that the position of a magnet moving along the sensor probe can be detected continuously within its travel.

5. 发明专利

JPH06102389A CONTROL ROD SHAFT EXTENDING MECHANISM 失效
公开(公告)号：JPH06102389A
公开(公告)日：1994-04-15
申请号：JP27509992
申请日：1992-09-18
申请人： MITSUBISHI ATOMIC POWER IND
发明人： NAKAI KOICHI
IPC分类号： G21C7/14 , G21C9/02
摘要： PURPOSE:To provide a control rod shaft extending mechanism capable of depressing a connecting shaft supporting an absorber section with bellows and depressing the absorber section into a core only at the time of the abnormal temperature rise of a coolant. CONSTITUTION:A control rod shaft extending mechanism is provided with a support tube 10 having a handling head 9 at the top section, bellows 13 filled with sodium inside and extendable downward by the expansion of sodium, and an absorber section 2 having a connecting shaft 18 at the upper end. A gap is provided between the bellows 13 and the connecting shaft 18, the extension quantity of the bellows 13 is small and the bellows 13 do not reach the connecting shaft 18 until the normal operating temperature is attained including the fluctuation by the change of the core burnup and the coolant flow distribution error in the core, and the bellows 13 interfere with the connecting shaft 18 to depress the absorber section 2 downward at the normal operating temperature or above.

6. 发明专利

JPH05215882A CONTROL ROD FOR FAST BREEDER REACTOR 失效
公开(公告)号：JPH05215882A
公开(公告)日：1993-08-27
申请号：JP5419592
申请日：1992-02-06
申请人： MITSUBISHI ATOMIC POWER IND
发明人： NAKAI KOICHI
IPC分类号： G21C7/11
摘要： PURPOSE:To positively suppress the core reactivity of feat breeder reactor. CONSTITUTION:The pin 15 of extension link mechanism 10 is fitted into a cam groove 14 provided at a cam unit 9, and the cam unit 9 is moved vertically by the thermal expansion difference between a thermosensitive cylinder 7 and a low heat expansion rod 8, thus changing the length of the extension link mechanism 10. The shape of the cam groove 14 is set in such a way that the extension link mechanism 10 is not extended until normal operating temperature but is extended at the time of exceeding the ordinary operating temperature. The extension quantity of the extension link mechanism 10 is determined by the shape of the cam groove 14 and the number of links and can be easily made 100mm or more as occasion demands.

7. 发明专利

JPS63108299A FUEL TAKE-IN-OUT DEVICE FOR FAST BREEDER REACTOR 失效
公开(公告)号：JPS63108299A
公开(公告)日：1988-05-13
申请号：JP25494986
申请日：1986-10-27
申请人： MITSUBISHI ATOMIC POWER IND
发明人： NAKAI KOICHI , IMAYOSHI SHO
IPC分类号： G21C19/16 , G21C19/32

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