Method and device for replacing control rod drives

专利摘要:
A control rod drive replacement device is provided. The control rod drive replacement device includes a first channel for mounting on a support under a nuclear reactor pressure vessel; a first control rod drive extractor removably received in the first channel, the first control rod drive extractor including a first housing configured for receiving a first control rod drive, the first housing being movable between a horizontal orientation in which the first housing is aligned within the first channel and a vertical orientation in which the first housing is aligned for receiving the first control rod drive from the nuclear reactor pressure vessel; a second channel connected on top of the first channel under the nuclear reactor pressure vessel; and a second control rod drive extractor removably received in the second channel, the second control rod drive extractor including a second housing configured for receiving a second control rod drive, the second housing being movable between a horizontal orientation in which the second housing is aligned within the second channel and a vertical orientation in which the second housing is aligned for receiving the second control rod drive from the nuclear reactor pressure vessel.
公开号:ES2673400A2
申请号:ES201890012
申请日:2016-08-31
公开日:2018-06-21
发明作者:Kurt David Klahn；Patrick GRUENEWALD；Dorian Tim LAMBERT
申请人:Framatome Inc；
IPC主号:

专利说明:

A method for replacing a control rod drive is also provided. The method includes providing a first channel on a support under the nuclear reactor pressure vessel and a second channel connected to the first channel; mobile mounting a first housing within the first channel; move the first housing from a horizontal orientation in which the first housing is aligned within the first channel with a vertical orientation; receiving a first control rod drive inside the first housing while the first housing is in the vertical orientation; move the first housing from the vertical orientation to the horizontal orientation while the first control bar drive is inside the first housing; remove the first housing with the first control rod drive from the first channel; mobile mounting a second housing that includes a replacement control bar drive therein within the second channel; move the second housing and the replacement control bar drive from a horizontal orientation to a vertical orientation; and providing the replacement control rod drive from the second housing to the pressure vessel of the nuclear reactor, while the second housing is in the vertical orientation.
A further aspect of the invention includes a replacement device for control bar drives 20 that includes a channel for mounting on a support under a nuclear reactor pressure vessel; and a control bar drive extractor removably received in the channel, the control bar drive extractor including a base and a housing rotatably connected to the base, the housing being configured to receive a drive bar drive control, including the base an axis of 25 base, the housing being rotatably attached to the base at the base to rotate between a horizontal orientation in which the housing is aligned within the channel and a vertical orientation in which the housing is aligned to receive the operation of control rods of the nuclear reactor pressure vessel, the mobile housing being vertical with respect to the base in the vertical orientation.
30
Another additional aspect of the invention includes a control rod drive replacement device that includes a channel for mounting on a support under a nuclear reactor pressure vessel; a control bar drive extractor removably received in the channel, including the control drive extractor 35 a housing for receiving a control bar drive; and an extension ramp coupled to an axial end of the channel. The extension ramp is configured to
selectively bridging a space between a leveling tray arranged for at least one to remove the housing and the control rod drive from the channel and supply the first housing and a new first control rod drive to the channel. In one embodiment, the replacement control device for bar drives may also include an additional channel mounted on the top of the channel; and an additional control bar drive extractor removably received in the additional channel, the control drive extractor including an additional housing for receiving an additional control bar drive. The leveling tray may be arranged for at least one to remove the additional housing and the additional control bar drive from the additional channel and supply the additional housing and a new additional control bar drive to the additional channel. The extension ramp can be removed removably coupled at the axial end of the channel for manual removal, it can be slidably coupled at the axial end of the channel or it can be rotatably coupled at the axial end of the channel.
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BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is described below by reference to the following drawings, in which:
twenty
Fig. 1 schematically shows a nuclear reactor pressure vessel of a BWR that includes a plurality of CRDs extending downward from the pressure vessel;
Fig. 2 shows a perspective view of a carousel shown in Fig. 1;
25
Fig. 3 shows a perspective view of the carousel with a lower channel of a CRD removal device installed in the carousel;
Fig. 4 shows a perspective view of the carousel with an upper channel of the CRD removal device 30 installed in the carousel at the top of the lower channel;
Fig. 5 shows a perspective view of the carousel with an upper mast assembly that is received in the upper channel;
Fig. 6a provides a perspective view and Fig. 6b provides a top plan view illustrating the upper mast assembly removed from the upper channel;
Fig. 7a provides a perspective view and Fig. 7b provides a top plan view illustrating the upper mast assembly that houses a CRD therein;
5 Figs. 8 to 21 illustrate the operation of the CRD removal device according to the exemplary embodiment of the invention;
Figs. 22a and 22b illustrate the opening and closing of a radiation shield in accordance with an embodiment of the CRD removal device to secure the radiation shield on a CRD 12; Y
Figs. 23a to 23c illustrate an extension ramp coupled to an axial end 132 of a first channel of the CRD removal device.
15 DETAILED DESCRIPTION
The present description provides a method and a device for replacing the control rod drives in a reactor pressure vessel. In particular, the method and the device are intended to allow rapid replacement of the CRDs in a boiling water reactor (BWR) during a normal refueling stop. The method and the device can significantly decrease the time associated with activities under the vessel, which leads to a decrease in the cost and the associated dose.
Fig. 1 schematically shows a nuclear reactor pressure vessel 10 of a BWR 25 that includes a plurality of CRD 12 extending downward from the pressure vessel 10. Under the pressure vessel 10 and the CRD 12, is provided a carousel-shaped support 14. According to an embodiment of the present invention, the carousel 14 is provided with a control bar drive replacement device schematically shown 16 to remove the CRD 12 and replace the CRD 12 with CRD of 30 replacement The components of the replacement device 16, including two channels 24, 36 and two control bar drive extractors 48, 102, and the method of operating the replacement device 16 are shown in greater detail in Figs. 3 to 21 and are analyzed below.
35 Fig. 2 shows a perspective view of the carousel 14. The carousel 14 is circular in shape and includes a cutout 18 formed therein that divides the carousel 14 into two sections
equal 19, 21. Sections 19 are connected together by two support beams 20, 22 provided near an outer circumference of the carousel 14 in the cutout 18.
Fig. 3 shows a perspective view of the carousel 14 with a lower channel 24 of the 5 replacement device 16 (Fig. 1) installed in the carousel 14. The lower channel 24 is provided within the cutout 18 and rests on the upper surfaces of the support beams 20, 22. The lower channel 24 includes a first section 26 to contact section 19 of the carousel 14 within the cutout 18 and a second section 28 opposite to the first section 26 to contact the section 21 of the carousel 14 within of the cut-out 18. Each 10 section 26, 28 includes an upper track 30 and a lower track 32 which are connected by a vertical wall 34. Laterally between the walls 34 of the sections 26, 28, a space is provided to receive a set of lower mast 102 (Figs. 13 to 20).
Fig. 4 shows a perspective view of the carousel 14 with an upper channel 36 of the 15 withdrawal device 16 installed in the carousel 14 in the upper part of the lower channel 24. The upper channel 36 includes a first section 38 for contacting the first section 26 of the lower channel 24 and a second section 40 opposite the first section 38 to contact the second section 28 of the lower channel 24. Similarly to the lower channel 24, each section 38, 40 includes an upper track 42 and a lower track 44 which are connected by a vertical wall 46.
Fig. 5 shows a perspective view of the carousel 14 with an upper CRD extractor 48, which is configured as a mast assembly, which is received in the upper channel 36 laterally between the walls 46 of the sections 38, 40.
25
Figs. 6a and 6b illustrate the upper mast assembly 48 removed from the upper channel 36 and provide a clearer view of the upper mast assembly 48. Fig. 6a provides a perspective view, while Fig. 6b provides a top plan view . With reference to Figs. 6a and 6b together with Figs. 8 to 13, the upper mast assembly 30 48 includes an upper CRD housing 50, which is configured as a hollow mast for receiving a CRD, rotatably attached to the upper channel 36 (Figs. 4 to 5, 8 to 13) on an upper base shaft 52 and an upper actuator 54 for rotating the upper mast 50 around the upper base axis 52 between a horizontal orientation, as shown, for example, in Figs. 8, 12 and 13, in which the upper mast 50 is aligned within the upper channel 36 (Figs. 8 and 12 to 13) and a vertical orientation, as shown, for example, in Figs. 9 to 11, in which the upper mast 50 is aligned to remove a
CRD of the pressure vessel of nuclear reactor. Advantageously, the upper mast assembly 48 is also arranged and configured such that the upper mast 50 can be moved vertically upwardly with respect to the upper base shaft 52, as discussed further below with respect to Fig. 10.
5
More specifically, with reference to Figs. 6a and 6b, the upper mast assembly 48 includes a base, which is formed by an upper stump assembly 56, which interacts with an elongated upper groove 58 formed in the upper mast 50 to allow the upper mast 50 to rotate around the upper base shaft 52 and allow the upper mast 50 10 to move upward vertically in the vertical orientation. The upper actuator 54 is supported by a carriage 60 positioned for a linear horizontal movement within the upper channel 36 (Figs. 4, 5, 8 to 13). To allow such movement, carriage 60 includes a plurality of wheels 61 for sliding along tracks 44 of sections 38, 40 (Fig. 4) of upper channel 36 (Figs. 3 to 5, 8 to 13). As shown in Fig. 8, when the upper mast 50 is in the horizontal orientation, the carriage 60 is positioned at a longitudinal end 100 of the upper channel 36.
With reference to Figs. 6a and 6b, in this embodiment, the actuator 54 is in the form of a winch 64 located therein to drive a pair of cables of 20 winch 51 to rotate the upper mast 50 and to move the upper mast 50 vertically when the upper mast 50 is in the vertical orientation. The cables 51 extend from the winch 64 and each is connected to a longitudinal end 68 of the mast 50 by a respective fork 53. The winch 64 controls the movement of the upper mast 50 between the horizontal and vertical orientations either by releasing or pulling the 25 cables 51. The release of the cable 51 allows the mast to rotate to rotate from the horizontal orientation to the vertical orientation. The reverse act of pulling the cable 51 transfers the upper mast 50 from the vertical orientation to the horizontal orientation. The mast 50 is pulled vertically upward in the vertical orientation by the winch 64 that pulls the cables 51.
30
The carriage 60 also supports a pair of clamps 66 to hold the mast 50 when the mast 50 is in the vertical orientation to restrict the rotation of the mast 50 around the axis 52 when the mast receives a CRD. The clamps 66 include rollers that slide along the surface of the mast 50 when the mast 50 moves vertically, allowing the clamps 66 to maintain the vertical orientation of the mast 50, without the mast 50 rotating around the axis 52 , since the mast 50 moves vertically. When the mast 50 has
moving from the vertical orientation to the horizontal orientation, the clamps 66 release the mast 50. The mast 50 is also provided with a set of wheels 69 at the longitudinal end 68 to slide along tracks 44 (Fig. 4) of the upper channel 36 (Figs. 4 to 5, 8 to 13) when the mast moves between the horizontal and vertical orientations.
5 At the longitudinal end 68, the mast 50 includes a mast carriage 70 driven by dual spindles 71 (Fig. 6a - only one being visible, while the other is locked by the wall 78) located on opposite sides of the carriage 70 for allow cart 70 to drive evenly. Adjacent to the mast carriage 70, the mast assembly 48 further includes a lower CRD support 72 to support a lower longitudinal end 10 of a CRD when the mast 50 is in the vertical orientation. The mast carriage 70 can be moved away from the lower CRD support 72 to receive a CRD when the mast 50 is in the vertical orientation and can move again towards the lower CRD support 72 so that the lower part of the CRD enters contact the lower CRD holder 72 before moving the mast 50 back to the horizontal orientation from the vertical orientation.
The upper stump assembly 56 includes two sections 74, 76, each being coupled with one of the two longitudinally extending walls 78, 80 of the mast 50. The walls 78, 80 are separated from each other and define a space between them. to receive 20 a CRD. Each stump section 74, 76 includes a shoulder 82 that extends into a respective elongated groove 58 in the walls 78, 80 and a vertically aligned base plate 84 from which the boss 82 protrudes. In the horizontal orientation, the protrusions 82 each come into contact with a first end stop edge 83 of the slot 58. As discussed further below, the second end stop edges 85 of 25 the slots 58 limit the vertical upward movement of the mast 50 in the vertical orientation. the projections 82 coming into contact in a maximum vertical section of the upper mast 50. Attached to the base plates 84, the upper stump assembly 56 further includes a set of wheels 88 in both sections 74, 76. The wheels 88 rest axially and they move along track 44 (Fig. 4) of channel 36 (Figs. 3 to 5, 8 to 13) 30 during the movement of the mast 50 between the vertical and horizontal positions.
Adjacent to the upper stump assembly 56, the mast assembly 48 further includes an upper CRD support 90 and CRD support arms 92 to support a CRD received in the mast 50 near a second longitudinal end 94 of the mast opposite the first 35 longitudinal end 68. The lower CRD support 72, the upper CRD support 90, and the CRD support arms 92 limit the CRD while the mast 50 is rotating from the
horizontal orientation to vertical orientation and while the mast is in its vertical orientation. Cart 70 cannot fully reach CRD when cart 70 is in its seated position. A descent section 91 that includes a spindle 93 and a motor 95 to move the spindle 93 towards the CRD when the mast 50 receives the CRD is used to support the CRD when it is lowered from the seat until the CRD can interconnect with the carriage 70 on the mast 50. The descent section 91 is also used during the subsequent insertion of the new CRD to return it to the seated position.
As shown in Fig. 8, the mast 50 is shorter than the channel 36 and is, for example, approximately two feet shorter than the existing drive exchange masts. The reduced size of the mast 50 and the ability of the projections 82 to slide in the groove 58 can facilitate the prevention of damage to the instrumentation cables under the vessel. Accordingly, the mast assembly 48 can be advantageously used in a single channel arrangement, instead of the dual channel arrangement described with respect to Figs. 4, 5, 8 to 21 and 23a to 23c.
As shown in Figs. 7a and 7b, which illustrate the view of the mast assembly 48 that houses a CRD 12 within the mast 50, due to the reduced size of the mast 50, when the CRD 12 is housed within the mast 50, the CRD 12 protrudes from the mast 50, making the 20 CRD 12 vulnerable to damage. Accordingly, a mast extension 96 is provided at the longitudinal end 94 to limit the dose at which workers are exposed to CRD during transport. Because a tip of the CRD is exposed to the highest dose, a radiation shield 97 is provided on the tip of the CRD at the extension of the mast 96. The radiation shield 97 is formed as a cylindrical plug to contour the end. axial and the outer cylindrical surface CRD 12. The radiation shield 97 is further described below with respect to Figs. 22a and 22b. In the view shown in Figs. 7a and 7b, as well as Figs. 6a and 6b, the mast extension 96 is removably attached to the mast 50 at the longitudinal end 94. The mast extension 96 can be attached to the mast 50 after the CRD 12 is received inside the mast 50 30 and moves to the horizontal orientation within channel 36 (Figs. 4 to 5, 8 to 13). The mast extension 96 may be formed of radiation protection material, or include said additional material, to reduce the exposure to the crew dose that performs the task of removing the CRD 12 from the control bar drive replacement device 16 The mast extension 96 includes a plurality of wheels 98 for sliding along the tracks 35 (Fig. 4) as the mast assembly 48 is removed from the channel 36 (Figs. 4 to 5, 8 to 13 ) after receiving a CRD from the pressure vessel. Wheels 61, 69, 88, 98
they allow sliding in and out of the upper channel along the leveling tray 132 (Figs. 23a to 23c).
Figs. 8 to 21 show the method of operation of the replacement device of 5 control bar drives 16, certain details of the replacement device 16 being shown schematically or omitted for ease of description. Fig. 8 shows the replacement device 16 in the carousel 14 with the upper mast 50 in the channel 36 in the horizontal orientation and Fig. 9 shows the upper mast 50 in the vertical orientation. As indicated above, to move the upper mast from 10 the horizontal orientation shown in Fig. 8 to the vertical orientation shown in Fig. 9, the clamps 66 are decoupled from the longitudinal end 68 of the mast 50 and the cables 51 are released from winch 64, causing the longitudinal end 68 to fall down by gravity through the space in the upper channel 36 and causing the longitudinal end 94 to rise above the channel 36 and towards the CRD 12 and the pressure vessel 10 15 (Fig. 1). This movement implies that the mast 50 rotates around the axis 52, which is defined by the projections 82 (Fig. 6a), while the projections 82 remain in contact with the first end stop edge 83 (Figs. 6a, 6b and 10), which in the vertical position is the upper end stop edge of the groove 58. During rotation, the winch carriage 60 slides from a longitudinal end 100 of the upper channel 36 to a longitudinal center of the upper channel 20 and towards the stump assembly 56. Once in an upright position, the carriage 60 is oriented adjacent to the mast 50 near the stump assembly 56, and the clamps 66 of the carriage 60 can grip the mast 50 to maintain the vertical position. Although the actuator 54 in this embodiment is formed by a single winch 64, in other embodiments the actuator 54 may include two or more winches or other drive devices. For example, a winch or drive device can rotate the mast 50 around the axis 52 and another winch or drive device can move the mast 50 vertically upwards.
Fig. 10 shows the replacement device 16 in a maximum vertical range of the upper mast 30. Accordingly, between the position shown in Fig. 9, in which the protrusions 82 (Fig. 6a) come into contact with the first or upper end stop edge 83 of the groove 58 and the upper mast 50 has a minimum vertical reach in the vertical position, and the position shown in Fig. 10, the mast 50 has moved vertically upward with respect to the axis of base 52 in the vertical orientation by pulling the longitudinal end 68 upwards by means of cables 51. More specifically, the mast 50 has been raised by the winch 64 vertically upward so that the protrusions 82 (Fig. 6a) are
they slide in the slots 58 from the contact with the upper end stop edges 83 to the contact with the second end stop edge or lower 85 (Fig. 8, 9, 11). When it is in the upper maximum vertical range or the highest vertical position, the mast 50 can receive a CRD 12 from the pressure vessel 10 (Fig. 1).
5
Fig. 11 shows the replacement device 16 containing a CRD 12 in the upper mast 50 in the minimum vertical reach position of the upper mast 50. Accordingly, between the position shown in Fig. 10, in which the projections 82 (Fig. 6a) come into contact with the second or lower or final stop edges 85 of the slot 58 and the upper mast 50 is empty, and the position shown in Fig. 11, the mast 50 has received a CRD 12 and has been lowered by the winch 64 vertically downwards releasing the cables 51 in such a way that the projections 82 (Fig. 6a) slide in the slots 58 from the contact with the lower end stop edges 85 to the contact with the upper end stop edges 83 (Fig. 10) of the slot 58. As indicated above, the mast 50 15 is configured such that the CRD 12 is longer than the mast 50 and when the mast 50 contains a CRD 12, a portion of CRD 12 stands out beyond of the longitudinal end 94 of the mast 50.
Fig. 12 shows the replacement device 16 containing the CRD 12 in the upper mast 20 in the horizontal orientation within the channel 36 with the mast extension 96 connected to the longitudinal end 94 of the mast 50. Workers can manually add the Mast extension 96 to channel 36 before movement of mast 50 containing CRD 10 from vertical orientation to horizontal orientation or mast extension can be added to channel 36 before mast 50 moves from initial horizontal orientation 25 to vertical orientation. The extension of the mast 96 is provided on the portion of the CRD 12 that protrudes longitudinally beyond the longitudinal end 94 of the mast 50. Accordingly, between the position shown in Fig. 11 and the position shown in Fig. 12, the winch 64 pulls the cables 51 whereby the mast 50 is rotated by the winch 64 around the axis 52 with the projections 82 (Fig. 6a) in contact with the 30 end stop edges 83 (Fig. 10) of the groove 58, and carriage 60 has slid back to the longitudinal end 100 of the channel 36 adjacent to the longitudinal end 68 of the mast.
Fig. 13 shows a lower mast assembly 102 that is received in the lower channel 24, while the upper mast assembly 48 remains in the upper channel 36 that contains the used CRD 12 extracted from the pressure vessel 10 (Fig. . one). The lower mast assembly 102 is identical to the upper mast assembly 48 and operates in the same manner as the
upper mast assembly 48. Accordingly, the same reference numbers will be used to describe the components of the lower mast assembly 102 than those previously used with respect to the upper mast assembly 48. The lower mast assembly 102 includes a lower mast 50 containing a new CRD 104 to replace the CRD 5 12 removed from the pressure vessel, a mast extension 96 being provided at the longitudinal end 94 of the lower mast 50.
As shown in Fig. 14, the upper mast assembly 48 (Figs. 8 to 13) has been removed from the upper channel 36 to discard the removed CRD contained within the upper mast assembly 10. The placement of the mast assembly lower 102 and the new CRD 104 in the lower channel 24 before removing the used CRD 12 (Figs. 11 to 13) from the upper channel 36 allows both operations to be carried out during a single trip by the workers for the same period of time, bringing the same set of workers the new CRD 104 into the lower mast assembly 102 and leaving with the old CRD 12 (Figs. 11 to 13) 15 in the upper mast assembly 48 - limiting exposure to the dose of workers below of the pressure vessel 10 (Fig. 1).
Fig. 15 shows the bottom mast 50 in the vertical position containing the CRD 104 with the mast extension 96 (Figs. 13 and 14) removed. The mast extension 96 is removed before rotation 20 from the horizontal orientation to the vertical orientation to provide a better distance. In Fig. 15, the projections 82 (Fig. 6a) come into contact with the first or upper end stop edge 83 (Fig. 10) of the groove 58 and the bottom mast 50 has a minimum vertical range in the vertical orientation .
25 Fig. 16 shows the replacement device 16 at a maximum vertical range of the lower mast 50. Accordingly, between the position shown in Fig. 15 and the position shown in Fig. 16, the mast 50 has been raised by the winch 64 vertically upwards by pulling the cables 51 in such a way that the projections 82 (Fig. 6a) slide in the slots 58 from the contact with the upper end stop edges 83 to the contact with the 30 end stop edges second or lower 85 (Fig. 15). When in the upper maximum vertical range or in the highest vertical position, the mast 50 releases the CRD 104 for installation at the bottom of the pressure vessel 10. Fig. 17 shows the replacement device 16 after the Mast assembly 102 release CRD 104 (Figs 13 to 16). The carousel 14 can then be rotated and / or the carriage 60 can move along the tracks 32 35 (Fig. 3 to 5) of the channel 24 to a position of another used CRD 12 in the pressure vessel 10 (Fig. 1 ) so that the lower mast assembly 102 can receive the used CRD 12, as
shown in Fig. 18.
Then, as similarly discussed above, and as shown in Fig. 19, the lower mast assembly 102, containing the used CRD 12, is rotated in the horizontal position by the winch 64 pulling the cables 51 and the mast extension 96 is placed on the portion of the CRD 12 protruding beyond the longitudinal end 94 of the lower mast 50. Next, as shown in Figs. 20 and 21, the process described with respect to Figs. 13 and 14 is repeated. The upper mast assembly 48 is provided with a new CRD 104 and is loaded into the upper channel 36, then the lower mast assembly 102 which includes the used CRD 12 is removed from the lower channel 24. Then, the process can be repeated as many times as necessary to replace each of the used CRDs 12 with a new CRD 104.
Figs. 22a and 22b illustrate the opening and closing of the radiation shield 97 to secure the radiation shield 97 on the CRD 12, Fig. 22a showing the radiation shield 97 in a closed configuration and Fig. 22b showing the shield against 97 radiation in an open configuration. As similarly described above, the radiation shield 97 is configured to fit and cover an axial end 110 of the CRD 12 (ie, the upper axial end when the CRD 12 is in the reactor). The axial end 110 has the highest radiation level of the CRD 12 because it was placed as close as possible to the reactor core during use, and therefore, manipulation of the axial end 110 requires special caution. In order to prevent workers from having to manually place the radiation shield 97 in the CRD 12, the radiation shield 97 is formed as two pieces that are articulated 25 to each other. More specifically, the radiation shield 97 includes a semi-cylindrical base or lower section 112 supported by a cylindrical base 114 of the mast extension 96 and a top or semi-cylindrical cover 116 that is connected to the lower section 112 by a hinge that extends longitudinally 118. The upper section 116 is closed on the upper part of the lower section 112 to form a cylindrical surface 120 and an end surface 122 which closes the cylindrical surface 120 at an axial end. In a preferred embodiment, the radiation shield 97 is self-closing, it is formed so that when the radiation shield 97 is supported on the mast extension 96 within the respective channel 24, 36 (Figs. 4, 13) in the configuration open, the upper section 116 is automatically closed on the lower section 35 112 when the axial end 110 of the CRD 12 descends to the lower section 112 from the vertical to the horizontal orientation. In one embodiment, the upper section 116 is
formed as a spring-loaded cover and / or with a finger on an inner face of the upper section 116, the finger being in the path of the axial end 110 of the CRD 12 when the CRD 12 passes from the vertical orientation to the horizontal orientation, thereby closing the cover 112. The radiation shield 97 may also include a lock 124 5 to lock the cover 112 on the base 116 in the closed configuration.
Figs. 23a to 23c illustrate an extension ramp 130 coupled at an axial end 132 of the first channel 36, whose side walls have been omitted for clarity. The extension ramp 130 is configured to selectively bridge a space between a 10 leveling tray 132 arranged for at least one to remove the mast assembly 48 from the channel 36 when the mast 50 of the mast assembly 48 contains the CRD 12 and supply the Mast assembly 48 to channel 36 when mast 50 of mast assembly 48 contains a new CRD. The leveling tray 132 is provided to connect the lower area of the vessel that includes the withdrawal device 16 (Figs. 1, 8 to 21) to a platform, which 15 is vertically higher than the lower vessel, where workers perform the exchange of the CRD. At the platform level, there is a door in a biological shield formed by a wall that supports the reactor. The leveling tray 132 includes a rotating upper section 134 articulated in the door at one end and a lower section 136 formed of structural steel that is permanently fixed to a 20-containment building that houses the pressure vessel. The upper section 134 is configured to be raised and lowered such that the other end of the upper section 134, which is opposite the articulated end, can be selectively aligned in a first position shown in Fig. 23a and in a second position in which the upper section 134 is in alignment with the lower section 136. When the extension ramp 130 is in the position 25 shown in Fig. 23a, the mast assembly 48 can extend from the channel 36 through the wheels 61, 69, 88, 98 along the extension ramp 130 to an upper section 134 of the leveling tray 132. The leveling tray 132 is also arranged for at least one to remove the mast assembly 102 from the channel 24 when the mast 50 of the mast assembly 102 contains a used CRD and supply the mast assembly 102 to channel 24 when the mast 50 of the mast assembly 102 contains the new CRD 104. The lower section 136 is arranged and configured to supply and remove the CRDs from the lower channel 24 when the upper section is aligned with the lower section 136.
To prevent the extension ramp 130 from blocking the supply or withdrawal of the CRDs from the lower channel 24, the extension ramp 130 can be mobilely coupled to the lower channel 24 and / or the upper channel 36. Fig. 23b shows extension ramp 130 coupled
rotating at the axial end of the upper channel 36 to the lower channel 24 by, for example, a hinge such that the extension ramp 130 can be rotated away from the leveling tray 132. Fig. 23c shows the extension ramp 130 slidably coupled at the axial end of the upper channel 36 to the lower channel 24, for example, by tracks and rollers in the lower channel 24, such that the extension ramp 130 slides away from the leveling tray 132 to channel 24. In another embodiment, the extension ramp 130 is removably coupled at the axial end of the upper channel 36 to the lower channel 24 and is manually removed and supplied to remove the mast assembly 48 from the upper channel 36. In additional embodiments 10, the extension ramp 130 may be articulated or slidably connected to the upper section 134.
In the foregoing specification, the invention has been described with reference to specific exemplary embodiments and examples thereof. However, it will be apparent that various modifications and changes can be made thereto without departing from the spirit and broader scope of the invention as set forth in the following claims. Therefore, descriptive memory and drawings should be considered in an illustrative rather than restrictive manner.

1. A replacement device for control bar drives comprising:
5
a first channel for mounting on a support under a nuclear reactor pressure vessel;
a first control bar drive extractor removably received in the first channel, the first control bar drive extractor including a first housing configured to receive a first control bar drive, the first mobile housing being between a horizontal orientation in which the first housing is aligned within the first channel and a vertical orientation in which the first housing is aligned to receive the first drive of control rods from the pressure vessel of nuclear reactor;
fifteen
a second channel connected at the top of the first channel under the pressure vessel of the nuclear reactor; Y
a second control bar drive extractor removably received in the second channel, the second control bar drive extractor including a second housing configured to receive a second control bar drive, the second mobile housing being between a horizontal orientation in which the second housing is aligned within the second channel and a vertical orientation in which the second housing is aligned to receive the second drive of control bars 25 from the pressure vessel of nuclear reactor.
2. The control bar drive replacement device according to claim 1, wherein the first control bar drive extractor includes a first actuator configured to rotate the first housing around a first
30 base axis for moving the first housing between the horizontal orientation and the vertical orientation, the first actuator being configured to move the first housing vertically with respect to the base axis in the vertical orientation.
3. The control bar drive replacement device according to claim 2, wherein the first control bar drive extractor includes
a base that rotatably joins the first housing to the first channel and that defines the

权利要求:
Claims (17)
[1]
first base axis, the first housing sliding along a first stump assembly during the vertical movement of the first housing in the vertical orientation.
[4]
4. The control rod drive replacement device according to claim 3, wherein the first housing includes a first elongate groove which is
extends longitudinally therein, the first base being a first stump assembly that includes a first projection defining the first base axis, the first projection extending to the first elongated groove and sliding along the first elongated groove during movement vertical of the first housing in the vertical orientation 10.
[5]
5. The control bar drive replacement device according to claim 1, wherein the first control bar drive extractor includes a spindle driven by a motor to help the first mast receive the first
15 control rod drive when the first mast is in vertical orientation.
[6]
The control rod drive replacement device according to claim 1, wherein the first actuator includes a winch configured to move the first mast between the horizontal orientation and the vertical orientation and configured to
20 Move the first mast vertically in the vertical orientation.
[7]
7. The control bar drive replacement device according to claim 1, wherein the first control bar drive extractor includes a lower support for contacting a lower end of the first drive bar drive.
25, the first mast being arranged and configured in such a way that when the lower end of the first control rod drive comes into contact with the lower support, the control rod drive extends longitudinally beyond a longitudinal end of the first mast.
30 8. The replacement device for control bar drives according to the
claim 7 further comprising a mast extension connectable to the longitudinal end of the first mast, the first mast extension being arranged and configured to surround a portion of the control rod drive that extends longitudinally beyond the longitudinal end of the first mast.
[9]
9. The replacement device for control bar drives according to the
claim 8 further comprising a radiation shield supported by the mast extension, the radiation shield including a door configured to close over an axial end of the first control bar drive when the first control bar drive is lowered to the position horizontal in the first channel. 5
[10]
10. The control rod drive replacement device according to claim 1 further comprising an extension ramp coupled to an axial end of the first channel, the extension ramp being configured to selectively bridge a space between a leveling tray arranged for at least one of
10 remove the first housing and the first control rod drive from the first channel and supply the first housing and a new first control rod drive to the first channel, the leveling tray being arranged for at least one to remove the second housing and the second control bar drive of the second channel and supply the second housing and a new second control bar drive 15 to the second channel.
[11]
11. A method for replacing a control rod drive in a nuclear reactor pressure vessel comprising:
20 providing a first channel on a support under the pressure vessel of the nuclear reactor and a second channel connected to the first channel;
mobile mounting a first housing within the first channel;
25 moving the first housing from a horizontal orientation in which the first housing is aligned within the first channel with a vertical orientation;
receiving a first control rod drive inside the first housing while the first housing is in the vertical orientation;
30
move the first housing from the vertical orientation to the horizontal orientation while the first control bar drive is inside the first housing;
remove the first housing with the first control rod drive from the first channel;
mobile mounting a second housing that includes a replacement control bar drive therein within the second channel;
move the second housing and the replacement control bar drive from a horizontal orientation to a vertical orientation; Y
provide the drive of replacement control rods of the second housing to the nuclear reactor pressure vessel, while the second housing is in the vertical orientation.
10
[12]
12. The method according to claim 11, wherein the first channel is fixed at the top of the second channel.
[13]
13. The method according to claim 11, wherein the movable assembly of the second housing including the replacement control bar drive therein
inside the second channel it is carried out before removing the first housing and the first control bar drive of the first channel.
[14]
14. The method according to claim 13, wherein moving the second housing and the replacement control bar drive from a horizontal orientation to a
Vertical orientation is performed after removing the first housing and the first control rod drive from the first channel.
[15]
15. The method according to claim 11, further comprising moving the first housing vertically upwards after moving the first housing from the
horizontal orientation to vertical orientation.
[16]
16. The method according to claim 15, further comprising providing a stump support that rotatably joins the first housing to the first channel.
30
[17]
17. The method according to claim 16, wherein the first housing includes an elongate groove extending longitudinally therein, the stump support including a projection extending within the elongated groove, including movement of the first housing vertically upwards move the projection vertically upwards
35 in the elongated groove.
[18]
18. The method according to claim 17, wherein the rotation of the first housing
from horizontal orientation to vertical orientation includes turning the projection while the projection contacts an end stop edge of the groove.
5 19. A control rod drive replacement device that
understands:
a channel for mounting on a support under a nuclear reactor pressure vessel;
10 a control bar drive extractor removably received in the channel, the control bar drive extractor including a base and a housing rotatably connected to the base, the housing being configured to receive a drive bar drive control, including the base a base axis, the housing being rotatably attached to the base at the base to rotate between an orientation
15 horizontal in which the housing is aligned within the channel and a vertical orientation in which the housing is aligned to receive the operation of control rods of the nuclear reactor pressure vessel, the mobile housing being vertically relative to the base in vertical orientation.
20 20. The replacement device for control bar drives according to the
claim 19, wherein the control rod drive extractor includes an actuator configured to rotate the housing around the base axis to move the housing between the horizontal orientation and the vertical orientation, the actuator being configured to move the housing in vertical in vertical orientation to zoom out an axis
25 rotation of the base shaft housing.
[21]
21. The control rod drive replacement device according to claim 19, wherein the base is a stump assembly that rotatably engages the housing to the channel and defines the base axis, the housing sliding
30 length of the stump assembly during vertical movement of the housing in the vertical orientation.
[22]
22. The control rod drive replacement device according to claim 21, wherein the housing includes an elongate slot extending
35 longitudinally therein and the stump assembly includes a projection defining the base axis, the projection extending into the elongate groove and sliding along
the elongated groove during vertical movement of the housing in the vertical orientation.
image 1

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同族专利:

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公开号 | 公开日

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JP6598407B2|2019-10-30|

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ES2673400R1|2018-10-22|

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JP2018529092A|2018-10-04|

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ES2673400B1|2019-07-26|

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US20170352439A1|2017-12-07|

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WO2017040584A1|2017-03-09|

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US10204710B2|2019-02-12|

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MX2018002110A|2018-06-08|

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法律状态:
2018-06-21| BA2A| Patent application published|Ref document number: 2673400 Country of ref document: ES Kind code of ref document: A2 Effective date: 20180621 |

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优先权:

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申请号 | 申请日 | 专利标题

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US14/842,441|US10204710B2|2015-09-01|2015-09-01|Method and device for replacing control rod drives|

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US14/842,441|2015-09-01|

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PCT/US2016/049585|WO2017040584A1|2015-09-01|2016-08-31|Method and device for replacing control rod drives|

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