JP2011064548A - Driving control system of control rod driving mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust a driving time of each CRD automatically and successively during operation of a BWR plant; to shorten a periodical inspection period of the BWR plant; and to reduce an exposure dose of an operator. <P>SOLUTION: This system includes: a control rod driving mechanism 12; a position indication device 48 for detecting a control rod position of the control rod driving mechanism 12; a water pressure control unit 15 including a selection valve device 33 for controlling selectively so that a flow direction of driving water supplied to/discharged from each control rod driving mechanism 12 can be changed, an accumulator device 32 for inserting control rods 12a quickly, and scram valves 37, 38; and a control rod driving water pump 18 for supplying driving water to the water pressure control unit 15 from a water source. In the water pressure control unit 15, driving devices 36a, 36b are provided on flow rate adjusting valves 35a, 35b for adjusting a flow rate supplied to/discharged from each control rod driving mechanism 12, and the flow rate passing the flow rate adjusting valves 35a, 35b during driving of the control rod driving mechanism 12 is adjusted and controlled automatically and successively by the driving devices 36a, 36b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a control rod drive hydraulic system facility for a nuclear reactor, and more particularly to a drive control system for a control rod drive mechanism that controls the drive of a hydraulic drive control rod drive mechanism.

  In a boiling water nuclear power plant (hereinafter referred to as BWR), as shown in Patent Document 1, a large number of water pressure driven control rod drive mechanisms (hereinafter referred to as CRD) are connected to a control rod drive hydraulic system and water pressure control. Drive control is performed by a control rod drive hydraulic system facility 1 composed of a unit (HCU) group (see, for example, Patent Document 1).

  In the control rod drive hydraulic system facility 1 of the BWR plant, as shown in FIG. 8, the control rod 2a is inserted into or extracted from the reactor core by the hydraulic drive type CRD 2, and the output operation of the reactor is controlled. The driving water flowing into the CRD 2 or the drainage discharged from the CRD 2 is selectively switched by opening / closing operations to switch the flow paths of the direction control valves 4a to 4d of the selection valve device 4 provided in the water pressure control unit 3.

  The selection valve device 4 is configured by combining four directional control valves 4a to 4d. When inserted, the directional control valves 4b and 4d are opened, and when pulled out, the directional control valves 4a and 4c are opened. The flow direction of the driving water and drainage is controlled. Other directional control valves are closed.

  Of the four directional control valves 4a to 4d provided in the selection valve device 4 of the HCV 3, manual flow rate adjusting valves 5a and 5b are respectively connected in series to the two directional control valves 4a and 4d. By adjusting the valve openings of the manual flow control valves 5a and 5b, the flow rate of the drive water flowing through the drive water line 6 and the drainage flow rate flowing through the drain line 7 are adjusted, and the insertion / withdrawal time of the control rod 2a is controlled. .

  The insertion / extraction time of the control rod 2a by driving the CRD 2 is adjusted so that the insertion / extraction time of the control rod 2a by the CRD 2 is within the target time by adjusting the valve opening of the manual flow control valves 5a, 5b. Adjusted.

  In the BWR plant, a large number of CRDs 2 are provided. The drive time of each CRD 2 is adjusted manually by manually adjusting the valve opening of the flow rate adjusting valves 5a and 5b of the selection valve device 4 provided corresponding to the CRD 2 so that they are within the target time. Yes.

  However, the opening adjustments of the flow rate adjusting valves 5a and 5b must individually act on a large number of flow rate adjusting valves, and it takes a lot of labor and time to adjust the insertion / extraction time of the control rod 2a. ing. Moreover, the CRD 2 is a piston type drive structure, and a seal ring (not shown) is used for the seal portion of the drive piston 2b. There is a possibility that the seal state of the drive piston 2b changes during driving of the CRD 2 and the piston drive speed changes.

  On the other hand, the adjustment of the driving time of the CRD 2 is performed during the periodic inspection period of the BWR plant. In the BWR plant, if it is found that the driving time of the CRD2 is out of the target time, the individual operation of the flow rate adjusting valve is performed so that the driving time of each CRD2 falls within the target time during the periodic inspection period. Adjusted individually.

JP 2003-337191 A

  In the control rod drive hydraulic system equipment 1 of the nuclear reactor, the driving time of the CRD 2 for individually adjusting the valve opening of the two flow rate adjusting valves 5a and 5b of the selection valve device 4 of the HCU 3 corresponding to each CRD 2 by manual operation. Adjustment work is carried out, whereby the insertion / extraction time of the control rod 2a is set within the target time.

  The drive time adjustment work of the CRD 2 requires a work of repeating “measurement → adjustment → measurement” for each of the many CRDs 2 and requires a lot of labor and work time. Moreover, the drive time adjustment work for each CRD 2 needs to be performed during the periodic inspection period of the BWR plant. In the BWR plant, from the viewpoint of shortening the periodic inspection period, it is strongly desired to shorten the driving time adjustment work of the CRD 2.

  On the other hand, in the BWR plant, while the CRD 2 is being driven, the seal state of the drive piston 2b may change, and the drive speed of the drive piston 2b may change. In order to eliminate or eliminate the drive time fluctuation of the drive piston 2b, it is a problem how to configure the control rod drive hydraulic system equipment 1.

  The present invention has been made in consideration of the above-described circumstances, and eliminates the need for CRD drive time adjustment work during the periodical inspection period, and controls the CRD drive time to be within the target time even during BWR plant operation. An object of the present invention is to provide a drive control system for a control rod drive mechanism.

  Another object of the present invention is that during operation of the BWR plant, the drive time of each CRD can be adjusted automatically and sequentially so that it falls within the target time, shortening the periodic inspection period of the BWR plant, and An object of the present invention is to provide a drive control system for a control rod drive mechanism that can reduce the exposure dose.

  In order to solve the above-described problems, a drive control system for a control rod drive mechanism according to the present invention includes a large number of control rod drive mechanisms for inserting or withdrawing control rods into and from the reactor core, and each of these control rods. Position indicating device for detecting control rod position of drive mechanism, selection valve device for selectively controlling flow direction of drive water supplied to and drained from each control rod drive mechanism, accumulator device and scram for rapidly inserting control rod In a drive control system of a control rod drive mechanism having a water pressure control unit having a valve and a control rod drive water pump for supplying drive water from a water source to the water pressure control unit, the water pressure control unit includes the control rod drive mechanism A drive device is provided in the flow rate adjustment valve that adjusts the flow rate of water supplied to and discharged from the pump. That is characterized in that the flow rate was automatically sequentially adjusting control.

  In the drive control system of the control rod drive mechanism according to the present invention, the drive time of insertion / extraction of the control rod drive mechanism can be automatically set to a predetermined target time, and each control rod drive can be driven during the periodic inspection period. The work for adjusting the drive time of the mechanism becomes unnecessary, and the periodical inspection period can be shortened.

  In addition, the flow rate of water supplied to and discharged from the control rod drive mechanism can be automatically adjusted and controlled, so that even when the seal state changes, the drive time for insertion and extraction of the control rod drive mechanism is always stable and within the target time. Even when adjusting the drive time of the control rod drive mechanism during the periodic inspection period of the BWR plant, it is not necessary to enter the radiation control area by manual operation from a remote location such as the central control room, It is possible to reduce the exposure of workers.

1 is a schematic system diagram showing a first embodiment of a drive control system for a control rod drive mechanism according to the present invention. FIG. 2 is a schematic diagram illustrating a fully pulled state of a control rod drive mechanism and a position pointing device in the drive control system of FIG. 1. FIG. 2 is a schematic diagram illustrating a fully pulled state of a control rod drive mechanism and a position pointing device in the drive control system of FIG. 1. The schematic system diagram which shows 2nd Embodiment of the drive control system of the control-rod drive mechanism which concerns on this invention. The schematic system diagram which shows 3rd Embodiment of the drive control system of the control-rod drive mechanism which concerns on this invention. The schematic system diagram which shows 4th Embodiment of the drive control system of the control-rod drive mechanism which concerns on this invention. The schematic system diagram which shows 5th Embodiment of the drive control system of the control-rod drive mechanism which concerns on this invention. The schematic system diagram which shows the drive control system of the conventional control rod drive mechanism.

  An embodiment of a drive control system for a control rod drive mechanism according to the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
In a boiling water nuclear power plant (hereinafter referred to as a BWR plant), a large number of reactor pressure vessels (hereinafter referred to as RPVs) 11 are accommodated in a reactor containment vessel 10, and a forested state or a drooping state is provided in a lower mirror portion of the RPV 11. A number of hydraulically driven control drive mechanisms (hereinafter referred to as CRD) 12 are provided in the installed state. Each CRD 12 is driven and controlled by the corresponding control rod drive hydraulic system equipment 13 so that the control rod 12a is taken in and out of the reactor core, and the reactor output is adjusted and controlled.

  The reactor control rod drive pressurization system facility 13 constitutes a drive control system of a control rod drive mechanism (CRD) 12 according to the present invention. The control rod drive hydraulic system equipment 13 includes a water pressure control unit (hereinafter referred to as HCU) 15 that controls the amount of drive water flowing into the CRD 12 and the amount of drainage discharged from the CRD 12.

  The HCU 15 is connected to the CRD 12 via the insertion line 16a and the extraction line 16b, while the control rod drive hydraulic system equipment 13 is provided on the discharge side of the control rod drive water pump 18 connected to the water source. And a water pressure control unit (HCU) 15 that is connected to the master control 19 by a pipe of the drive water line 20a and performs switching of the flow path of the drive water and drainage and control of the flow rate of the drive water and drainage. Prepare.

  The master control 19 includes a flow rate adjustment valve 22a and a pressure adjustment valve 22b connected in series, and further includes a stabilization valve 23 so as to bypass the pressure adjustment valve 22b. The upstream side of the flow rate adjusting valve 22a is connected to the filling water header 25, and the downstream side thereof is connected to the driving water header 26 and the driving water line 20a. The downstream side of the pressure regulating valve 22b is connected to the cooling water header 27 and the discharged water header 28, respectively. A drain line 20b from the HCU 15 is connected to the drain header 28.

  A plurality of water pressure control units (HCUs) 15 are installed corresponding to the CRD 12. The HCU 15 includes an accumulator device 32 including an accumulator 30 and a nitrogen container 31, and a selection valve device 33 that controls the flow direction of driving water and drainage so that the flow path can be switched. The selection valve device 33 includes four directional control valves 34a, 34b, 34c, 34d connected in a substantially bridge shape, and two directional control valves out of the four directional control valves 34a, 34b, 34c, 34d. Flow rate adjusting valves 35a and 35b with a drive device are added to the valves 34a and 34d, respectively, in a serial connection state.

  The driving water line 20 a is connected between the direction control valves 34 c and 34 da of the selection valve device 33, while the drainage line 20 b extending from between the direction control valves 34 a and 34 b is connected to the drainage header 27. An insertion line 16a extending from between the direction control valves 34a and 34d is connected to the lower side of the drive piston 12b of the CRD 12, and a drawing line 16b extending from the upper side of the drive piston 12b is connected to the direction control valves 34b and 34c of the selection valve device 33. Connected between.

  Reference numeral 37 denotes a normally closed scrum inlet valve, reference numeral 38 denotes a normally closed scram outlet valve, and reference numeral 39 denotes a scrum discharge header. Reference numeral 40 denotes a check valve connected to the accumulator filling line 41, and reference numeral 42 denotes each gate valve constituting the pressure boundary of the HCU 15.

  2 and 3, the control rod drive mechanism (CRD) 12 is a piston-type drive structure that is hydraulically driven, and the drive piston 12b is housed in the CRD housing 45 so as to be movable up and down. Is done. A control rod 12a is detachably provided on a drive tube (index tube) 12c extending upward from the drive piston 12b, and the control rod 12a is provided so as to be freely inserted into and removed from the core of the RPV 11 by raising and lowering the drive piston 12b. A seal ring 46 is used for the seal portion of the drive piston 12b. There is a possibility that the sealing state of the CRD 12 is changed by the elevation drive of the drive piston 12b, and the piston driving speed is changed.

  For this reason, the CRD 12 is provided with a position indicating device 48. The position indicating device 48 is fixed in the CRD housing 45 and is provided with a position indicating tube 50 inserted in the drive piston 12a and the driving tube 12c extending in the axial direction. A plurality of reed switches 51 are provided in the position indicating tube 50. Are stored in a line at an equal pitch in an aligned state. On the other hand, a magnet 52 is built in the drive piston 12b, and the reed switch 51 is turned ON in response to the raising / lowering drive of the drive piston 12b, and the current raising / lowering position of the drive piston 12b can be detected. Thereby, the CRD 12 can detect the drive speed of the control rod 12a.

  In the CRD 12, a detection signal S from each reed switch 51 of the position indicating device 48 is sent to the flow rate adjusting valves 35a, 35b with drive devices. The opening amounts of the flow rate adjusting valves 35a and 35b are automatically adjusted by the driving devices 36a and 36b, and the CRD 12 is shown in FIG. 3 from the fully extracted position of the control rod 12a shown in FIG. It is automatically adjusted so that a required target time, for example, 40 seconds to 60 seconds, preferably about 50 seconds, is obtained at all insertion positions of the control rod 12a. Note that the core of the nuclear reactor has a height of about 4 m, and the full extraction position and the full insertion position of the drive piston 12b shown in FIGS. 2 and 3 have a lifting stroke corresponding to the height of the core. .

  The driving speed of each CRD 12 is determined by linking the flow rate adjusting valves 35a, 35b with driving device and the position indicating device 48 during operation of the BWR plant, and constantly monitoring the driving speed of the CRD 12 by the position indicating device 48. It is possible to automatically adjust the valve opening degree of the flow rate adjusting valves 35a, 35b provided in the driving device 36a, 36b.

  Next, the insertion and extraction operations of the control rod drive mechanism (CRD) 12 by the control rod drive hydraulic system facility 13 will be described.

  When the CRD 12 is driven and the control rod 12a is inserted during operation of the BWR plant or during a periodic inspection period, the direction control valve 34b in the selection valve device 33 of the HCU 15 is responded to a response signal from a central control chamber (not shown). , 34d are opened. The other directional control valves 34a and 34c are kept closed. When the control rod drive water pump 18 is driven in the open / close state of the selection valve device 33, the drive water from the pump 18 enters the water pressure control unit 15 through the flow rate adjustment valve 22a and the drive water header 26, and The selection valve device 33 enters the insertion line 16a through the direction control valve 34d and the flow rate adjustment valve 35b, and is supplied to the lower part of the drive piston 12b of the CRD 12 to push up the drive piston 12b and the drive tube 12c.

  On the other hand, the water above the drive piston 12b of the CRD 12 is sent from the direction control valve 34b to the discharge header 27 via the drawing line 16b, and the control rod 12a is inserted.

  When the control rod 12a is pulled out, the direction control valves 34a and 34c in the selection valve device 33 of the HCU 15 are first opened. Then, the driving water acts on the upper side of the drive piston 12b of the CRD 12 through the drawing line 16b of the selection valve device 33 to push down the drive piston 12b. As a result, water on the lower surface of the drive piston 12b is sent from the direction control valve 34a to the discharge header 27 via the insertion line 16a, whereby the operation of pulling out the control rod 12a is performed roughly.

  Next, the operation at the time of emergency stop (scrum) will be described.

  When each CRD 12 of the BWR plant is urgently operated and scrammed, the scram inlet valve 37 and the scram outlet valve 38 of the water pressure control unit (HCU) 15 are opened. At this time, the directional control valves 34a to 34d of the selection valve device 33 are kept closed.

  On the other hand, in the accumulator device 33 of the HCU 15, the accumulator 30 is connected to the nitrogen container 31, and the high-pressure nitrogen gas sealed in the nitrogen container 31 acts below the piston in the accumulator 30. The upper part of the piston of the accumulator 30 is connected to the discharge side of the control rod drive water pump 18 via a check valve 40, and high-pressure filling water is accumulated in a state where the piston is pushed down.

  At the time of scrum, the scram inlet valve 37 and the scram outlet valve 38 are rapidly opened in response to the scrum signal. Thereby, the high pressure water in the accumulator 30 flows into the CRD 12 from the insertion line 16a via the scram inlet valve 37, and pushes up the drive piston 12b rapidly. The water above the drive piston 12b is discharged to the scrum discharge header 39 via the drawing line 16b and the scram outlet valve 38, so that the scrum operation is performed.

  Further, during normal operation of the BWR plant in which the control valve 12a is not inserted / extracted and the scrum operation is not performed, the master controller 19 always cools the CRD 12 via the cooling water line 43 of the cooling water header 26 and the insertion line 16a of the HCU 15. Water is supplied. At this time, the CRD 12 is not driven, and the drive piston 12b is not driven up and down.

  In addition, each header of the filling water header 25, the driving water header 26, the cooling water header 27, and the discharged water header 28 is also connected to each of a plurality of other water pressure control units (not shown).

  By the way, the reactor power of the BWR plant is controlled by inserting or extracting the control rod 12a from the reactor core. The driving of the CRD 12 is controlled by the HCU 15 provided corresponding to each CRD 12.

  The driving water flowing to the CRD 12 and the drainage discharged from the CRD 12 are controlled by opening the direction control valves 34b and 34d among the four direction control valves 34a to 34d of the selection valve device 33 of the HCU 15 to thereby control the rod 12a. In addition, by closing the direction control valves 34a and 34c, the control rod 12a is pulled out to control the flow of driving water / drainage of the CRD 12.

  The insertion / extraction time of the control rod 12a is determined based on the detection signal S from the position indicating device 48 by adjusting the valve opening degree of the flow rate adjusting valves 35a, 35b installed on the four direction control rods 34a-34d of the selection valve device 33. This is automatically performed by the operation control of the driving devices 369a and 36b. By automatically controlling the valve opening degree of the flow rate adjusting valves 35a and 35b with drive devices, the flow rate of the drive water flowing to the CRD 12 through the drive water line 20a and the flow rate 20a flowing through the drainage line 20b are adjusted.

  The drive time of the CRD 12 is obtained by acquiring the position detection signal S when the magnet 52 of the drive piston 12b sequentially approaches each of the plurality of reed switches 51 installed in the position control tube 50 of the position control device (PIP) 48. The drive speed of the drive piston 12b can be calculated. The magnet 52 provided in the drive piston 12b that is driven up and down sequentially passes through the reed switches 51 to sequentially acquire the position detection signals S from the reed switches 51, and the position detection device 48 receives all insertion signals, A full withdrawal signal can be obtained.

  Accordingly, the operation of the BWR plant is performed so that the driving time of the CRD 12, that is, the insertion / extraction time of the control rod 12a is within the target time, specifically, the range of 40 to 60 seconds, for example, 50 seconds. During this, the driving time of the CRD 12 is automatically adjusted.

  In the drive control system of the control rod drive mechanism 12 of the present invention, the drive time for insertion / extraction of the CRD 12 is automatically adjusted within a predetermined target time. Specifically, the valve openings of the flow rate adjusting valves 35a and 35b are automatically adjusted by the drive devices 36a and 36b that are controlled by the position detection device 48. Therefore, the drive time for inserting / withdrawing the control rod 12a of the CRD 12 can be automatically set within the predetermined target time, no pre-adjustment work is required, and the drive of the CRD 12 can be performed even during operation of the BWR plant. The time can be set so as not to deviate from the target time.

  The drive control system of the control rod drive mechanism 12 adds drive devices 36a and 36b to the flow rate adjusting valves 35a and 35b of the selection valve device 33 of the HCU 15, respectively, and based on the detection signal S obtained by the position indicating device 48. The drive devices 36a and 36b are controlled using the calculated drive speed of the control rod 12a as an input signal. By controlling the opening of the flow rate adjusting valves 35a and 35b by the driving devices 36a and 36b, the speed during driving of the CRD 12 can be automatically and sequentially adjusted so that the driving time of the CRD 12 is always within the target time. Can be adjusted automatically. Therefore, during the operation of the BWR plant, the CRD 12 is not required to be adjusted in advance, and the driving time of each CRD 12 is automatically set so as not to deviate from the target time.

  Further, in the drive control system of the control rod drive mechanism 12, the drive time for inserting / withdrawing the CRD 12 can be automatically set within a predetermined target time, no pre-adjustment work is required, and the target can be set even during operation of the BWR plant. Never be out of time. Accordingly, the seal state of the drive piston 12b (seal ring 46) changes as the CRD 12 is repeatedly inserted and withdrawn from the control rod 12a, but the drive speed of the drive piston 12b is detected by the position indicating device 48. The drive time for inserting / withdrawing the CRD 12 is always automatically adjusted so as to be within the target time. For this reason, it is not necessary to individually adjust the insertion / extraction time of the control rod 12a during the periodic inspection period, and the periodic inspection period can be shortened.

  In the first embodiment, the example in which the operation control of the drive devices 36a and 36b in the control rod drive hydraulic system equipment 13 is performed by the detection signal S from the position indicating device 48 has been described, but the operation of the drive devices 36a and 36b is described. The control is performed not only by a detection signal from the position indicating device 48 but also by one or more detection signals of a detection signal for detecting a driving water flow rate from the driving water line 20a or a drainage flow rate from the drainage line 20b. You may make it do. In this case, a flow rate detector or the like is provided in the driving water line 20a and the drainage line 20b, and consistency between signals is obtained by the flow rate signal from the flow rate detector and the position detection signal from the position indicating device 48.

  Further, the operation control of the drive devices 35a and 35b in the control rod drive hydraulic system facility 13 may be performed by remote control from a controller (not shown) in the central control room. In this case, a detection signal from the position pointing device 48 is also input to the controller of the central control room, and the drive devices 35a and 35b may be controlled by a controller that is driven and controlled by this detection signal. Then, the opening degree of the flow rate adjusting valves 35a and 35b is adjusted by the driving devices 36a and 36b, and the CRD 12 is installed so that the driving time is within the target time.

[Second Embodiment]
FIG. 4 is a schematic system diagram showing a second embodiment of the drive control system for the control rod drive mechanism according to the present invention.

  The drive control system of the control rod drive mechanism shown in the second embodiment is configured as a control rod drive hydraulic system facility 13A for a nuclear reactor. This equipment 13A is different from the flow rate adjusting valves 35a, 35b with a driving device shown in the first embodiment in that the flow rate adjusting valves 55a, 55b with a driving position are provided in the driving water line 20a and the drain line 20b. Further, the directional control valves 34a and 34b of the HCU 33 are different from the configuration shown in the first embodiment in that manual flow rate adjusting valves 56a and 56b are provided. Other configurations and operations are the same as those in the first embodiment. Therefore, the same reference numerals are given to the same configurations and operations, and the description thereof will be omitted or simplified.

  The drive control system of the control rod drive mechanism of the second embodiment includes a flow rate regulating valve 55a with a drive device on the drive water line 20a and the drain line 20b connected to the water pressure control unit (HCU) 15 of the control rod drive hydraulic system equipment 13. , 55b are provided. The opening degree of the flow rate adjusting valves 55a and 55b is automatically adjusted and controlled by the drive devices 56a and 56b added to the flow rate adjusting valves 55a and 55b.

  The driving devices 56a and 56b are controlled by a detection signal S from the position indicating device 48. Specifically, the driving devices 56a and 56b are controlled based on the detection signal S from the position indicating device 48, and the valve opening degree of the flow rate adjusting valves 55a and 55b is automatically adjusted and controlled. The driving devices 56a and 56b adjust and control the valve opening degree of the flow rate adjusting valves 55a and 55b so that the driving time of the CRD 12 is within a target time, for example, the insertion / extraction time of the control rod 12a is within 40 to 60 minutes. The drive speed of the control rod 12a is adjusted.

  In this way, the drive devices 36a and 36b automatically adjust and control the valve opening degree of the flow rate adjustment valves 35a and 35b, and the CRD 12 is similar to the flow rate adjustment valves 35a and 35b with drive devices shown in the first embodiment. The amount of driving water and the drainage flow rate from the CRD 12 are adjusted.

  The drive water flow rate flowing through the drive water line 20a and the drainage flow rate flowing through the drain line 20b are adjusted by the flow rate adjusting valves 55a and 55b with the drive unit, and the BWR plant is operated so that the drive time of the CRD 12 is always within the target time. It can be adjusted automatically. Therefore, during the BWR plant operation, the CRD 12 does not need to be adjusted in advance, and the driving time of each CRD 12, that is, the insertion / extraction time of the control rod 12a is the same as the driving time of the CRD 12 shown in the first embodiment. It is automatically adjusted so as not to miss the target time.

[Third Embodiment]
FIG. 5 is a schematic system diagram showing a third embodiment of the drive control system for the control rod drive mechanism according to the present invention.

  The drive control system of the control rod drive mechanism shown in the third embodiment is configured as a control rod drive hydraulic system facility 13B for a nuclear reactor. This equipment 13B is provided with the flow regulating valve 58 with a drive device in the insertion line 16a, unlike the one provided in the selection valve device 33 described in the first embodiment. The direction control valves 34a to 34d are not provided with a flow rate adjusting valve. Since other configurations and operations are not different from the drive control system of the control rod drive mechanism shown in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted or simplified.

  In the drive control system for the control rod drive mechanism shown in the third embodiment, a flow rate adjusting valve 58 with a drive device is provided on the insertion line 16a from the selection valve device 33 of the HCU 15 to the CRD 12. The flow rate adjusting valve 58 is provided in the insertion line 16 a between the selection valve device 33 and the downstream side of the scram inlet valve 37, and the valve opening degree of the flow rate adjusting valve 58 is automatically adjusted and controlled by the driving device 59. .

  The drive device 58 is controlled by the detection signal S from the position detection device 48, and automatically adjusts and controls the valve opening degree of the flow rate adjustment valve 59. The drive device 58 automatically adjusts and controls the valve opening degree of the flow control valve 59 so that the drive time of the CRD 12 is a target time, for example, the insertion / extraction time of the control rod 12a is 40 minutes to 60 minutes, preferably 50 minutes. The drive speed of the control rod 12a is adjusted so as to be within the range.

  In this way, the drive device 59 automatically adjusts and controls the valve opening degree of the flow rate adjustment valve 58, and similarly to the flow rate adjustment valve 58 with the drive device shown in the first embodiment, the amount of drive water to the CRD 12 and The amount of drainage from the CRD 12 is adjusted. In this case, it is only necessary to provide one flow rate adjusting valve 58 with a driving device, and it is not necessary to provide two as shown in the first embodiment.

  In the third embodiment, the flow rate adjusting valve 58 with a driving device installed in the insertion line 16a adjusts the driving water flow rate flowing from the driving water line 20a through the insertion line 16a and the drainage flow rate flowing from the insertion line 16a through the drainage line 20b. The driving time of the CRD 12 can be adjusted.

  Thereby, in the BWR plant, the drive time of the CRD 12 is automatically adjusted so that it always falls within the target time. Therefore, prior adjustment work of the CRD 12 is not required, and the driving time of each CRD 12, that is, the insertion / extraction time of the control rod 12a, deviates from the target time, similarly to the driving time of the CRD 12 shown in the first embodiment. It can be set automatically so that there is no.

[Fourth Embodiment]
FIG. 6 is a schematic system diagram showing a fourth embodiment of the drive control system for the control rod drive mechanism according to the present invention.

  The drive control system of the control rod drive mechanism shown in the fourth embodiment is configured as a control rod drive hydraulic system facility 13C for a nuclear reactor. This equipment 13C is provided with the drive valve 20 with a flow regulating valve 60 with a drive device, which is provided in the drive water line 20a, unlike the one provided with the selection valve device 33 described in the first embodiment. The directional control valves 34a to 34d are not provided with a flow rate adjusting valve. Since other configurations and operations are not different from the drive control system of the control rod drive mechanism shown in the third embodiment, the same components are denoted by the same reference numerals and description thereof is omitted or simplified.

  In the drive control system for the control rod drive mechanism shown in the fourth embodiment, a flow rate adjusting valve 60 with a drive device is provided between the master controller 19 and the drive water header 26. The flow rate adjusting valve 60 is provided between the downstream side of the flow rate adjusting valve 23a from the control rod driving water pump 18 and the driving water header 26. The flow rate adjusting valve 60 is automatically adjusted and controlled by the driving device 61. Is done.

  The drive device 61 is controlled by the detection signal S from the position detection device 48 and automatically adjusts and controls the valve opening degree of the flow rate adjustment valve 60. The drive device 61 automatically adjusts and controls the valve opening degree of the flow control valve 60 so that the drive time of the CRD 12 is a target time, for example, the insertion / extraction time of the control rod 12a is 40 minutes to 60 minutes, preferably 50 minutes. The drive speed of the control rod 12a is adjusted so as to be within the range.

  Thus, the drive device 61 automatically adjusts and controls the valve opening degree of the flow rate adjustment valve 60, and similarly to the flow rate adjustment valve 60 with the drive device shown in the third embodiment, the drive water amount to the CRD 12 and The amount of drainage from the CRD 12 is adjusted. In this case, it is only necessary to provide one flow rate adjusting valve 60 with a drive device as in the third embodiment, and the layout configuration is simplified.

  In the fourth embodiment, the amount of driving water flowing to the CRD 12 via the HCU 15 is adjusted by the flow rate adjusting valve 60 with a driving device installed in the driving water line 20a, and the driving time of the CRD 12 can be adjusted.

  Thereby, in the BWR plant, the drive time of the CRD 12 is automatically adjusted so that it always falls within the target time. Therefore, prior adjustment work of the CRD 12 is not required, and the driving time of each CRD 12, that is, the insertion / extraction time of the control rod 12a, deviates from the target time, similarly to the driving time of the CRD 12 shown in the first embodiment. It can be set automatically so that there is no.

[Fifth Embodiment]
FIG. 7 is a schematic system diagram showing a fifth embodiment of the drive control system for the control rod drive mechanism according to the present invention.

  The drive control system of the control rod drive mechanism shown in the fifth embodiment is configured as a control rod drive hydraulic system facility 13D for a nuclear reactor. This equipment 13D is provided with flow control valves 63a, 63b with drive devices on the directional control valves 35a, 35b of the selection valve device 33, similarly to the control rod drive hydraulic drive equipment 13 shown in the first embodiment. Drive devices 64a and 64b are added to the flow rate adjusting valves 63a and 63b, respectively. The driving devices 64a and 64b are automatically controlled by converting the detection signal S from the position indicating device 48 by a controller (not shown), and the opening amounts of the flow rate adjusting valves 63a and 63b are controlled by the driving devices 64a and 64b. Adjusted automatically.

  In this case, the controller is provided in the central control room or the driving devices 64a and 64b, and automatically controls the driving devices 64a and 64b by converting the detection signal from the position pointing device 48. Also, the individual drive devices 64a and 64b are manually controlled from a remote location by a controller installed in the central control room or the like so that the drive time of the CRD 12, that is, the insertion / extraction time of the control rod 12a is within the target time. .

  Since other configurations and operations are not different from the control rod drive hydraulic system equipment 13 shown in the first embodiment, the same configurations and operations are denoted by the same reference numerals, and description thereof is omitted or simplified.

  At that time, the opening degree of the flow rate adjusting valves 64a and 64b of the selection valve device 33 provided in the HCU 15 of the control rod drive hydraulic system equipment 13D is controlled and controlled by the drive devices 65a and 65b. The driving devices 65a and 65b may be controlled automatically by a detection signal from the position pointing device 48, or may be manually controlled from a remote place by a controller installed in the central control room or the like. Automatic control and manual control of the devices 65a and 65b may be performed simultaneously or in parallel.

  Thereby, during the operation of the BWR plant, the drive time of the CRD 12 is adjusted so as to always fall within the target time. Therefore, prior adjustment work of the CRD 12 becomes unnecessary, and the drive time of each CRD 12, that is, the insertion / extraction time of the control rod 12a is within the target time, and the control rod drive hydraulic system does not deviate from this target time. Equipment 13D can be provided.

  Further, when adjusting the driving time of the CRD 12 during the periodic inspection period of the BWR plant, the flow rate adjusting valves 63a and 63b for adjusting the driving water flow rate and the drainage flow rate are automatically controlled by the driving devices 64a and 64b, or the central control room. Therefore, the operator does not need to enter the radiation control area, and the exposure dose can be reduced.

10 Reactor containment vessel 11 Reactor pressure vessel (RPV)
12 Control rod drive mechanism (CRD)
12a Control rod 12b Drive piston 12c Drive tube 13, 13A, 13B, 13C, 13D Control rod drive hydraulic system equipment 15 Water pressure control unit (HCU)
16a Insertion line 16b Extraction line 18 Control rod drive water pump 19 Master controller 20a Drive water line 20b Drain line 22a Flow rate adjustment valve 22b Pressure adjustment valve 23 Safety valve 25 Filling water header 26 Drive water header 27 Cooling water header 28 Drain water header 30 accumulator 31 nitrogen container 32 accumulator device 33 selection valve devices 34a, 34b, 34c, 34d lateral control valves 35a, 35b flow rate adjusting valves 36a, 36b drive device 37 scram inlet valve 38 scram outlet valve 39 scram discharge header 40 check valve 41 Accumulator filling line 42 Check valve 43 Cooling water line 45 CRD housing 46 Seal ring 48 Position indicating device 50 Position indicating tube 51 Reed switch 52 Magnets 55a and 55b Flow rate adjusting valves 56a and 56b Driving device 8,60 flow control valve 59, 61 drives 63a, 63b flow regulating valves 64a, 64b drive

Claims (8)

A number of control rod drive mechanisms that insert or withdraw control rods into the core of the reactor,
A position indicating device for detecting the control rod position of each of these control rod drive mechanisms;
A selection valve device that selectively controls the flow direction of drive water supplied to and drained from each control rod drive mechanism, and a water pressure control unit that includes an accumulator device and a scram valve that rapidly inserts the control rod;
In a drive control system of a control rod drive mechanism having a control rod drive water pump for supplying drive water from a water source to the water pressure control unit,
The water pressure control unit is provided with a drive device for a flow rate adjustment valve that adjusts the flow rate of water supplied to and discharged from the control rod drive mechanism, and this drive device allows a flow rate that passes through the flow rate adjustment valve during driving of the control rod drive mechanism. A drive control system for a control rod drive mechanism, wherein automatic adjustment control is automatically performed. The water pressure control unit includes a selection valve device assembled by connecting four directional control valves in a bridge shape,
The selection valve device is provided with a flow control valve with a drive device in each of two directional control valves connected to an insertion line of the control rod drive mechanism,
The drive control system for a control rod drive mechanism according to claim 1, wherein the flow rate through the flow rate adjustment valve is adjusted and controlled by the drive unit. The water pressure control unit includes a drive water line to which drive water from the water source is supplied, and a drain line from which the drive water is drained.
A flow control valve with a driving device is installed in each of the driving water line and the drainage line,
2. The drive control system for a control rod drive mechanism according to claim 1, wherein the drive water flow rate flowing through the drive water line and the drainage flow rate flowing through the drainage line are adjusted and controlled by the flow rate adjusting valve with the drive unit. The water pressure control unit includes an insertion line and a drawing line connected to a control rod drive mechanism,
A flow control valve with a driving device is installed in the insertion line,
The flow rate adjusting valve with the driving device adjusts and controls the flow rate of the driving water supplied to the control rod drive mechanism through the insertion line when the control rod is inserted and the flow rate discharged from the control rod drive mechanism through the insertion line when the control rod is pulled out. The drive control system of the control rod drive mechanism according to claim 1. The control rod drive water pump is configured to supply water from a water source to the water pressure control unit via a master controller,
Install a flow control valve with a drive between the master controller and the drive water header,
2. The drive control system for a control rod drive mechanism according to claim 1, wherein a flow rate of drive water supplied to the control rod drive mechanism via the water pressure control unit is adjusted and controlled by the flow rate adjusting valve with the drive device. The drive device has a drive time of the control rod drive mechanism within a target time based on at least one signal from the control rod position signal of the position indicating device, the drive water flow rate of the control rod drive mechanism and the drainage flow rate signal thereof. The drive control system for a control rod drive mechanism according to any one of claims 1 to 5, wherein the opening degree of the flow regulating valve is automatically controlled so as to be within the range. The drive device adjusts and controls the flow rate adjustment valve by remote control from a controller in the central control room,
The drive control system for a control rod drive mechanism according to any one of claims 1 to 5, wherein the opening degree of the flow rate adjusting valve is manually controlled so that the drive time of the control rod drive mechanism falls within a target time. . A drive control system for a control rod drive mechanism implemented by a combination of the automatic control according to claim 6 and the manual control according to claim 7.

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