JPS58106499A - Fuel exchanging device of fast breeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a refueling device for a fast breeder reactor that ensures refueling operations within the reactor vessel.

Technical Background of the Invention Figure 1 shows a schematic configuration of a fast breeder reactor, in which a reactor vessel 1
Inside the reactor core, a large number of fuel assemblies 2... are loaded on a support mechanism 3. Further, inside the furnace vessel 1, a liquid metal (usually liquid sodium) 4 is accommodated as a coolant.

The upper opening of the furnace vessel 1 is closed by a shielding flag 5. The shielding glove 5 includes a fixed plug 6 having a circular hole 6A at an eccentric position and fixed to the furnace vessel 1, and a rotary plug 7 rotatably attached to the fixed flag 6 so as to close the circular hole 6A. It consists of rotate! The lug 7 has an upper mechanism 9 that holds a control rod drive mechanism 8, and a fuel exchange device 10 that exchanges the fuel assembly 2 inside the reactor vessel 1.
As shown in FIG. 2, both are mounted at eccentric positions, and during operation, the upper mechanism 9 is located at the center of the furnace vessel 1, that is, at the center of the fixing flag 6.

A coolant inlet pipe 1 and a coolant outlet pipe 12 are disposed outside the furnace vessel 2 . One end of the inflow pipe 1 penetrates the lower part of the peripheral wall of the furnace vessel 1 and is introduced below the support mechanism 3, and one end of the outflow pipe 12 is connected to the peripheral wall of the furnace vessel 1 and is connected to the support mechanism 3 within the furnace vessel 1. It is configured to communicate with the upper part of the mechanism 3.

Furthermore, a protective vessel 13 is provided outside the furnace vessel 1 to protect the furnace vessel 1, and this protective vessel 13 includes protective tubes 14 and 15 that protect the coolant inflow pipe 11 and the coolant outflow pipe 12, respectively. It is installed in one piece. Further, an oval hole 16 is provided in a part of the rotating guara, and an oval plug 17 that closes the oval hole 16 is connected to the fuel exchange device 1.
θ is attached.

3 to 9 show the fuel exchange device 10, in which reference numeral 18 denotes an exchange device support casing fixed to the upper surface of the oblong plug 17. FIG. A support cylinder 19 is rotatably supported within the support housing 18 via a bearing 20 .

Note that the support cylinder 19 is vertically introduced into the furnace vessel 1 through the oval flag 17. Also, the support housing 18
A hoisting frame 21 is constructed on the upper part of the hoisting frame 21, and a hoisting machine 22 is installed on this frame 21. A bevel gear 23 is attached to the outer periphery of the support cylinder 19 within the support casing 18, and a motor 24 is installed outside the support cylinder 18. A rotating shaft 241L of this motor 24 is introduced horizontally into the support housing 18, and a bevel gear 25 is attached to its introduction end, so that both bevel gears 23 and 25 mesh with each other.

A notch 26 extending from near the lower surface of the oblong plug 17 to the lower end is provided on one side of the support cylinder 19. Further, inside the furnace vessel 1, a guide tube 27 with a notch extending over the entire length on the negative side has a notch 28 connected to the notch 2 of the support cylinder 19.
6, and the support cylinder 19 and guide tube 27 are integrally connected via connecting members 29 and 30. The rotating Siragua, motor 24, both bevel gears 25, 23, support cylinder 19, and guide tube 27 constitute a flange position selection mechanism.

An elevator pipe 31 is introduced into the support cylinder 19 . A part 31k of the notch 5 is provided on one side of the elevator pipe 31, and a motor housing case 32 is attached to the upper end of the elevator pipe 31. It is suspended from machine 22. The hoisting machine 22 and the hoisting wire 33...
The elevating mechanism is configured by:

Two motors (not shown) are housed in the motor housing case 32, and the rotating shafts 34 and 35 of each motor are vertically introduced into the elevator pipe 31 as shown in FIG. .35 each have a threaded portion on the outer periphery, and a long nut 36, 37 is screwed into each threaded portion. Also, at the lower end of each long nut 36.37 is a rod 38.39.
are connected in series, and the beam 7 is attached to the lower end of each rod 38, 39.
One end of each of the links 40 and 41 is pivotally supported 1, and the link 41 constitutes a cranno drive operating mechanism together with the rod 39, the rotating shaft 35 that engages with the rod 39, and the motor that drives it. It is.

A tubular cranium support 6-holder 42 is housed inside the guide tube 27. This clamp support 42 is formed in a size that allows it to be inserted through the notches 26 and 2B, and has a notch 43 on the negative side. The clamp support 42 and the elevator pipe 31 are made up of two links 4.
4.45, and the intermediate portion of one link 44 is pivoted to the other end of the link 40. Further, both the above-mentioned links 44 and 45 are connected to each other by a link 46 at their intermediate portions. A pair of clamp claws 47 and 48 are located at the lower part of the clamp support body 42, and each intermediate portion thereof is pivotally supported inside the support body 42, and the clamp claws 47 and 48 are mutually openable and closable, thereby forming a lamp mechanism 49. As shown in FIGS. 6 to 8, these clamp claws 47 and 48 have 48k at the lower end of the engaging portion 47 bent by external force, and a release protrusion at the upper end of their opposing surfaces. 47B and 48B, and clamp sliding surfaces 47C and 48C are provided below the pivot position. The lower part of the clamp support body 42 has a small diameter, and its lower end is a guide part 50 having a substantially hemispherical cylinder shape, and each of the engaging parts J7A, 48A of the clamp claws 47.48.
It has openings 51 and 52 for protruding to the outside.

Further, a rod-shaped clamp driving body 53 is accommodated inside the clamp support body 42 so as to be movable up and down. This clamp driver 53 has large diameter portions 54.55 at two locations on the lower end, and these large diameter portions 54.55 are connected to the two rung claws 47.
．． It is interposed between 48. In addition, the clamp drive body 53
As shown in FIG. 3, the other end of the link 41 is pivotally supported at the intermediate portion of the link. The link 4 above is the link 4 above.
6, the intermediate portion is pivotally supported by a pin 56.

Furthermore, a fuel exchange relay rack 57 is provided inside the reactor vessel 1 as shown in FIG.
In addition, the fuel assembly 2 is inserted into and removed from the relay rack 57 and the outside of the reactor vessel 1 using a take-out device (not shown).

The fuel exchange device configured as described above operates as follows.

First, the clamp mechanism 49 is positioned above a predetermined fuel assembly 2 as shown in FIG. 6 by the flang position selection mechanism. That is, when the rotary plug 7 is rotated, the support cylinder 19
When the horizontal position of the rotary plug changes and the support tube 19 is rotated by the motor 24, the clamp support 42 housing the crank f mechanism 49 revolves around the support tube 19 together with the guide tube 27. By appropriately combining the rotations of 7 and the rotation of the support cylinder 19, the clamp mechanism 49 can be moved to a desired position.

Next, when one of the motors in the motor housing case 32 is driven to rotate the rotary shaft 34 in one direction, the rod 38 is lowered, and the clamp support 42 is accordingly moved through the links 40° 44.45. It descends inside the guide tube 27. and the seventh
As shown in the figure, the lower end of the clamp support 42 is inserted into the upper four parts (handling heads) of the fuel assembly 2.

Next, the shift lamp drive body 53 is operated by the clamp drive body operation mechanism.
lower. That is, when the other motor in the motor housing case 32 is driven to rotate the rotary shaft 35 in one direction, the rod 39 is raised, and the clamp drive body 53 is accordingly lowered via the link 41. Therefore, the large diameter portion 55 of the fluff driver 53 descends while slidingly contacting the clamp sliding surfaces 47C and 411C of the clamp claws 47.48.
As shown in FIG. 8, each engaging portion 47 of the clamp claw 47, 48 has
48k protrudes through the openings 51 and 52. the result,
Both retaining pawls 51 and 52 engage with the inner edges of the two upper end members of the fuel assembly 2 from the inside.

Next, the shift lamp mechanism 49 is raised by the lifting mechanism. That is, when the hoisting machine 22 shown in FIG.
5.46 and clamp support 42 are raised. Thereupon, the fuel assembly 2 clamped by the crank mechanism 10-shaft 49 is also pulled up from the core and accommodated in the guide tube 27 as shown in FIG.

When the lower end of a predetermined fuel assembly 2 is pulled up slightly higher than the upper ends of the other fuel assemblies 2 in this way, the clamp position selection mechanism causes the fuel exchange relay provided on the side of the core to The fuel assembly 2 is transferred to a position above the rack 57, and then the elevator pipe 31 is lowered by the elevator mechanism, and together with this, the fuel assembly 2, which is clamped by the clamp mechanism 49, is held in the relay rack 57. After that, the motor housing case 32
When the motor inside is driven to reverse the rotating shaft 35, the rod 39 is lowered and the clamp driver 5 is moved through the link 41.
3 rises, and the large diameter portion 54 provided at the lower end of the clamp drive body 53 is moved to the release protrusion 4 of both crank pawls 47 and 48.
7B and 48B, and both run claws 47 and 48 are closed. As a result, the engaging portions 47A, 48A of the two run claws 47, 48 are disengaged from the inner edge of the upper end recess 2A of the fuel assembly 2, and are housed inside the clamp support 42 (see FIG. 7). Next, when the rotating shaft 34 is reversed and the rod 38 is pulled up, the clamp support 42 is pulled up via the links 40, 44, 45, and together with this, the clamp mechanism 49 is also moved upward from the fuel assembly 2. Separate.

After that, the fuel assembly 2 held in the relay rack 57
will be taken out of the furnace by a take-out device (not shown). Further, the fuel assembly 2 is transferred from the relay rack 57 to the reactor core using the fuel exchange device 10 in the same manner as described above.

Further, during reactor operation, the fuel exchange device 10 leaves the support cylinder 19 and the guide pipe 22, and other mechanisms (lift pipe 3), clamp support 42, clamp mechanism 49, links 40, 47, 44. 45°, 46, etc.) are taken out of the furnace. These mechanisms are taken out of the furnace as follows.

That is, the motor in the motor housing case 32 is driven to rotate the rotating shaft 34 and the rod 38 is pulled up. As a result, the links 44, 45 rotate upward about the pivot point relative to the elevator pipe 31, and all the links 40, 41.
44, 45, and 46 are folded upward and stored in the support cylinder 19. Accordingly, the clamp support 42 pivoted on the links 44, 45 is also removed from the guide tube 27 through its cutout 28, and is then accommodated in the support cylinder 19 through its cutout 26, and then the elevator tube 31 It is often stored inward through the notch 31A. Therefore, by pulling up the elevator pipe 31 with the hoisting machine 22), the elevator pipe 31, clamp support 42, clamp mechanism 49, links 40, 41, 44, 45, 46, etc. are removed from the furnace. It can be taken out.

Problems with the Background Art In the fuel exchange device configured as described above, if a malfunction occurs such as the clamp mechanism 49 not opening or closing, the elevator pipe 31, the clamp support 42, and the clamp mechanism 49 can be removed by the above-mentioned procedure. , links 40, 41, 44, 45.46
It is necessary to fold the parts, take them out of the furnace vessel 1 as a whole, and carry out appropriate repairs 13-.

However, when trying to hold the fuel assembly 2 with the clamp mechanism 49 and lift it up as shown in FIG.
7.48 does not slide smoothly and the clamp claw 47.4
8 from the fuel assembly 2, the elevator pipe 31, clamp support 42, and clamp mechanism 4
9. The links 40, 41, 44, 45, 46, etc. cannot be folded, and therefore, there is a risk of a difficult situation in which they cannot be taken out of the furnace vessel 1 for repair.

Purpose of the Invention The present invention was made based on the above circumstances.
The purpose of this is to introduce the clamp release mechanism into the reactor vessel to release the clamp when a situation arises in which the clamp/mechanism cannot be removed from the fuel assembly, such as when the clamp drive body is stuck to the clamp claw. An object of the present invention is to provide a fuel exchange device for a fast breeder reactor that can improve the situation.

14- Summary of the Invention The fast breeder reactor fuel exchange device according to the present invention includes a maintenance rack capable of holding fuel assemblies in the reactor vessel, and a pair of clamps mounted on clamp supports arranged in the reactor vessel. A clamp mechanism with two claws is installed, and the clamp drive body is raised and lowered by the clamp drive body operating mechanism within the furnace vessel so that it slides into contact with both clamp claws, thereby opening and closing both of the ranzo claws. In addition, a cranometer position selection mechanism that moves the clamp mechanism in the horizontal direction and a lifting mechanism that raises and lowers the clamp mechanism are provided, and the clamp support body, Franz mechanism, clamp drive body, and clamp drive body operating mechanism are folded and integrated into the furnace vessel. The clamp driving body can be inserted into and removed from the outside, and the clamp driving body can also be directly operated by a clamp release mechanism at a position above the maintenance rack.

Therefore, if a situation arises in which the clamp driver cannot be operated smoothly by the clamp driver operating mechanism, the clamp release mechanism is introduced into the furnace vessel and the clamp driver is directly operated. The clamp mechanism can be removed from the fuel assembly, and the clamp support body, clamp mechanism, clamp drive body, and clamp drive body operating mechanism can be folded and taken out of the reactor vessel as a unit for appropriate repairs.

Embodiment of the Invention FIG. 10 shows a schematic configuration of a fast breeder reactor, in which a reactor core is constructed by loading a large number of fuel assemblies 102 on a support mechanism 10B inside a reactor vessel 101. . Further, inside the furnace vessel 101, a coolant and a liquid metal (usually liquid sodium) 104 are housed.

The upper opening of the furnace vessel 101 is closed by a shielding plug 105. The shielding plug 105 has a circular hole 1 at an eccentric position.
Fixed plug 1 fixed to the furnace vessel 101 with 06k
θ6<! -1 A rotary plug 107 rotatably attached to the fixed plug 106 so as to close the circular hole 106A.
The rotary plug 107, which has a pointed configuration, has an upper mechanism 109 that holds the control rod drive mechanism 10B, and a fuel exchange device 110 that exchanges the fuel assembly 102 inside the reactor vessel 101, as shown in FIG. The upper mechanism 109 is also mounted at an eccentric position, and during operation, the upper mechanism 109 is located at the center of the furnace vessel 101, that is, at the center of the fixed plug 1θ6.

A coolant inflow pipe 111 and a coolant outflow pipe 112 are provided outside the furnace vessel 101 . One end of the inflow pipe 11 passes through the lower part of the peripheral wall of the furnace vessel 10 and is introduced below the support mechanism 103 , and one end of the outflow pipe 112 is connected to the peripheral wall of the furnace vessel 1010 and is connected to the support mechanism 101 in the furnace vessel 101 . It is configured to communicate above the mechanism 103.

Furthermore, a protection container 113 for protecting the furnace container 101 is provided outside the furnace container 101, and the protection container 113 includes protection pipes 114 and 115 for protecting the coolant inflow pipe 111 and the coolant outflow pipe 112, respectively. It is installed in one piece. Further, 17- An oval hole 116 is provided in a part of the rotary plug 1θ7, and an oval plug 11 that closes this oval hole 116 is provided.
7 is equipped with the fuel exchange device 110.

12 to 17 show the fuel exchange device 110, in which reference numeral 118 denotes an exchange device support casing fixed to the upper surface of the oblong plug 117. This support housing 118
A support cylinder 119 is rotatably supported inside via a bearing 120. Note that the support cylinder 119 is vertically introduced into the furnace vessel 101 through the oblong plug 117. In addition, a hoisting frame 121 is provided on the upper part of the support case 118.
is constructed, and a hoist 122 is installed on this pedestal 121. A bevel gear 123 is attached to the outer periphery of the support cylinder 119 within the support housing 118 . Further, a motor 124 is installed outside the support casing 118. A rotating shaft 124A of this motor 124 is connected to the support case 1.
18 and a bevel gear 125 at its introduction end.
The bevel gears 18-123 and 125 are engaged with each other.

A notch 126 extending from near the lower surface of the oval plug 117 to the lower end is provided on one side of the support cylinder 119. Further, inside the furnace vessel 101, a guide tube 127 whose negative side is notched over the entire length is arranged vertically with its notch 128 facing the notch 126 of the support cylinder 119. and the guide tube 127 are the connecting member 129°13
They are integrally connected via 0. The rotating plug 1θ2, the motor 124, both bevel gears 125,1
23, the support cylinder 119 and the guide tube 127 constitute a flang position selection mechanism.

An elevator pipe 131 is introduced into the support cylinder 119 . A notch 131 is provided on one side of the elevator pipe 131, and a motor housing case is provided at the upper end of the elevator pipe 131.
The case 132 is suspended from the hoisting machine 122 via hoisting wires 133. Then, the hoisting machine 122 and the hoisting wire 133
- Two motors (not shown) are housed in the motor housing case 132, and the rotating shafts 134 and 135 of each motor are
As shown in FIG. 13, it is vertically introduced into the elevator pipe 131. Both rotating shafts 134 and 135 have threaded portions on their outer peripheries, and long nuts 136 and 137 are screwed into each threaded portion. Also, each long oak) 136,137
Rods 138 and 139 are connected to the lower ends of the rods, and links 140° and 141 are connected to the lower ends of each rod 138 and 139.
One end of each is pivoted. The link 141 constitutes a clamp drive body operating mechanism together with the rod 139, the rotating shaft 135 that engages with the rod 139, and the motor that drives this.

A tubular clamp support 14 is provided inside the guide tube 127.
2 is accommodated. This clamp support body 142 is formed in a size that allows it to be inserted through the notches 126 and 12B, and has a notch 143 on the negative side. The clamp support 142 and the elevator pipe 131 are connected by two links 144 and 145, and the intermediate portion of one link 144 is pivotally supported by the other end of the link 140. Further, both the links 144 and 145 are connected at their intermediate portions by a link 146.

At a lower position within the flange support 142, a pair of clamp claws 147, 148 are pivotally supported at their respective intermediate portions inside the support 142, and are mutually openable and closable, forming a runzo mechanism 149. As shown in FIGS. 15 to 17, these clamp claws 147, 148 have an engaging portion 147 bent outward at the lower end thereof, and have a release protrusion at the upper end of their opposing surfaces. Sections 147B and 148B,
In addition, the sliding contact surface 1 for Franz ° is located below the pivot position.
It has 47C and 148C. The lower part of the clamp support body 142 has a small diameter, and the lower end thereof has a substantially hemispherical guide part 150, and the clamp claws 147,
Each retaining portion 147 of 148 has openings 151 and 152 for protruding to the outside of 148Af.

21- Moreover, a rod-shaped clamp driving body 153 is housed inside the clamp support body 142 so as to be movable up and down. This clamp driver 153 has a large diameter portion 154 at two locations at the lower end.
155, and these large diameter portions 154, 155 are interposed between the two lance claws 147, 14'. Further, the upper end of the clamp driving body 153 projects upward from the upper end of the guide tube 127, and a large-diameter grip portion 156 is provided at the projecting end. A contact piece 157 extending horizontally is provided on one side of the grip portion 156, as shown in FIG. Further, the clamp driving body 153 has its intermediate portion pivoted to the other end of the link 141 as shown in FIG.
The intermediate portion is pivoted to 46.

In addition, as shown in FIG. 10, inside the reactor vessel 10, there are a fuel exchange relay rack 159 and a maintenance rack 160 on the side of the reactor core.
is provided. The fuel conversion relay rack 159 is used as a relay point during fuel exchange, and the transfer of the fuel assembly 102 between this relay rack 22-159 and the reactor core is performed by the fuel exchange device 110, and the fuel assembly 102 is transferred between the relay rack 22-159 and the reactor core. Insertion and removal of the fuel assembly 102 between the tank 159 and the outside of the reactor vessel 1 is performed by a removal device (not shown). The maintenance rack 160 is also capable of holding the fuel assembly 102 and is used, for example, when it is necessary to temporarily lower the fuel assembly 102 lifted by the fuel exchange device 110.

The oval plug 117 has a maintenance rack 16
As shown in FIG. 18, an insertion/ejection port 161 is provided at a position directly above the clamp release mechanism 1.
62 is introduced into the furnace vessel 10.

Here, the structure of the clamp release mechanism 162 will be explained based on FIGS. 18 to 21.

A support frame 163 is mounted on the oval plug 117 so as to cover the river insertion/removal port 161.
A guide tube lifting nut 1 is installed inside the guide tube 63 via a bearing 164.
65 is rotatably attached. This guide tube elevating nut 165 has a threaded portion on its inner periphery, and has an operating rod 166 extending outward on its outer periphery.

An elevating tube 167 is screwed into the inside of the guide tube elevating nut 165, and a guide tube 168 is connected to the lower surface of the elevating tube 167. Further, a bearing case 169 is attached to the upper surface of the elevating cylinder 167, and a bearing 1 is attached to this bearing case 169.
The rotary operation shaft 17 is rotatably inserted through the shaft 70 . This operating shaft 171 has a threaded portion on its outer periphery, and has a circular handle 172 attached to its upper end.

A partition plate 173 is provided in the middle part of the guide tube 168, and a pair of grippers 174 and 175 are provided at the lower part of the guide tube 168, as shown in FIG.
74 and is pivotally supported inside the guide tube 168 via 175A. These grippers 174 and 175 have engaging portions 174B and 175B facing each other at their lower ends, and the shaft 17
41° 175A have protrusions 174C, 174D and 175C, 175D facing each other, respectively, and an opening/closing operation rod 176 is interposed between them.

The opening/closing operation rod 176 passes through the center of the partition plate 173 and is disposed in the guide tube 168, and has a screw hole 177 at its upper end that is screwed into the rotation operation shaft 171.
It has a large diameter opening/closing operation part 178 on the outer periphery of the upper end. When the opening/closing operation rod 176 is in the lowered position, the opening/closing operation section 178 has lower protrusions 174D, 175D of both grippers 174, 175 as shown in FIG.
When the opening/closing operation rod 176 is in the raised position, the upper protrusion 174C, 175C of both grippers 174, 175 is opened as shown in FIG. Both retaining parts 174B, 1
This is to close the space between 75B and 75B.

Two detection rods 179 and 180 having the same length are provided inside the guide tube 168 so as to penetrate through the partition plate 173. The upper ends of these 25-rods 179 and 180 have large diameter portions of 1791° and 180°.
A, the large diameter portion 179 penetrates through the upper bottom of the elevating tube 167, and 1BOA is located on the upper surface of the upper bottom of the elevating tube 167. Further, the lower ends of both rods 179 and 180 are made to protrude slightly downward from the lower end of the guide tube 168.

Liquid gold R1 is placed between the support frame 163 and the elevator tube 167.
Bellows 1 for sealing the circulation of 04 and its paper
The bellows 181 prohibits rotation of the elevating cylinder 167. Therefore, the guide tube lifting nut 165
When the cylinder 167 rotates, the elevator cylinder 167 will rise or fall. A bellows 182 is installed between the partition plate 173 and the opening/closing operation rod 176 for sealing the flow of the liquid metal 104 and its peno 4 on both sides of the partition plate 1730. 1760 rpm is prohibited. Therefore, when the rotary operation shaft 171 rotates, the opening/closing operation rod 176 moves up or down.

26- Furthermore, the partition plate 173 and each detection rod 179°180
Also between the liquid metal 10 on both sides of the partition plate 173
4 and a bellows 18 for sealing the circulation of the paper.
3,184 is installation.

The fuel exchange device configured as described above operates as follows.

First, the clamp mechanism 149 is positioned above a predetermined fuel assembly 102 as shown in FIG. 15 by the clamp position selection mechanism. That is, when the rotary plug 107 is rotated, the horizontal position of the support cylinder 119 changes, and the motor 12
When the support cylinder 119 is rotated by 4, the clamp mechanism 14
Since the clamp support body 142 accommodating 9 rotates around the support cylinder 1190 together with the guide tube 127, by appropriately combining the rotation of the rotating plug θ7 and the rotation of the support cylinder 1190, the clamp mechanism 149 can be rotated as desired. Next, when one of the motors in the motor housing case 132 is driven to rotate the rotating shaft 134 in one direction, the rod 138 is lowered and the links z4o, 144, 745 are moved to the next position.
The clamp support 142 descends into the guide tube 127 via the guide tube 127 . Then, as shown in FIG. 16, the clamp support 14
The lower end of the fuel assembly 102 enters into the upper end recess 102 of the fuel assembly 102.

Next Niklang drive body operation mechanism 15
Lower 3. That is, when the other motor in the motor housing case 132 is driven to rotate the rotating shaft 135 in one direction, the rod 139 rises, and the link 14
1, the clamp drive body 153 is lowered. Therefore, the large diameter portion 155 of the clamp driver 153 is connected to the clamp claw 147.
．． The clamp claws 147 descend while slidingly contacting the sliding contact surfaces 147C and 148C of the clamps 148, as shown in FIG.
, 148, and 148k in the opening 151.
, 152) to make it stand out. As a result, both engaging claws 151,
152 engages with the inner edge of the upper end recess 102k of the fuel assembly 102 from the inside.

Next, the clamp mechanism 149 is raised by the lifting mechanism.

That is, when the hoisting machine 122 shown in FIG.
9 is lifted up, and the link 14θ is integrated with this.
141,144゜145.146 and clamp support 1
42 rises. The fuel assembly 102 flanged to the clamp mechanism 149 is also pulled up from the core.
It is accommodated in a guide tube 127 as shown in FIG.

When the lower end of the predetermined fuel assembly 102 is pulled up slightly higher than the upper ends of the other fuel assemblies 1θ2... in this way, the clamp position selection mechanism moves the fuel exchange relay rack provided on the side of the core. 159 and then lowered the elevator pipe 131 by the elevator mechanism, and the fuel assembly 102 was clamped together with this by the clamp mechanism 149.
is held in the relay rack 159.

Thereafter, when the motor in the motor housing case 132 is driven 29- to reverse the rotating shaft 135, the rod 139 is lowered and the clamp driver 153 is raised via the link 141, and the lower end of the clamp driver 153 is The large-diameter portion 154 provided in both the release protrusions 147B of the ranzo claws 147, 148.

148B, and both run claws 147 and 148 are closed. As a result, the engaging portions 147A and 148k of the two lance claws 142 and 148 are disengaged from the inner edge of the upper end recess 102A of the fuel assembly 102 and are housed inside the clamp support 142 (see FIG. 16). Next, rotate the rotating shaft 134 [7. When the rod 138 is pulled up, the link 14
The clamp support 142 is pulled up through 0.144° 145, and together with this, the clamp mechanism 149 is also separated upwardly from the fuel assembly 102.

Note that the fuel assembly 102 held in the relay rack 159
will be taken out of the furnace by a take-out device (not shown). Further, the transfer of the fuel assembly 102 from the relay rack 159 to the reactor core is also carried out using the fuel exchange device 110 in the same manner as in the above operation.

In addition, during reactor operation, the fuel exchange device 110 leaves the support cylinder 119 and the guide tube 127, and other mechanisms (
Lift pipe 13), clamp support 142, clamp mechanism 1
49, Link 140° 141.144, 145, 146
etc.) are removed from the furnace. These mechanisms are taken out of the furnace as follows.

That is, the motor in the motor housing case 132 is driven to rotate the rotating shaft 134 and the rod 138 is pulled up. As a result, the links 144 and 145 rotate upward about the pivot point relative to the elevator pipe 13, and all the links 140, 141, 144, 145, and 146 are folded upward and stored in the support cylinder 119. That will happen. Therefore, the clamp support 142 pivotally supported by the links 144, 145 also separates from the guide tube 127 through the cutout 128 of the rim, and then enters the support tube 119 through the cutout 128 of the guide tube 127.
6 and is further stored into the elevator pipe 131 through its notch 131. Therefore, by pulling up the elevator pipe 13 with the hoisting machine 122, the elevator pipe 131, clamp support body 142, clamp mechanism 149, links 140, 141, 144, 145
゜146 etc. can be taken out of the furnace in one piece.

By the way, when holding the fuel assembly 102 with the clamp machine 5149 and lifting it up as shown in FIG.
If a situation arises in which the flang claws 147, 148 cannot be removed from the fuel assembly 102 because the flang claws 147, 148 do not slide smoothly against both clamp claws 14'l, 148, the clamp release mechanism 162 is removed from the reactor vessel 10. ``introduced inside the building'' to try to bring the situation under control.

That is, the fuel assembly 1 engaged with the clamp mechanism 149
02 to the fuel exchange relay rack 159 and release the flang there, the clamp driver 15
When the large diameter portion 155 of No. 3 sticks to the flange sliding surfaces 147C and 148C of the two lance claws 147 and 148 and the clamp drive body 153 cannot be raised, first, Insertion and dislocation 161
The guide tube 168 of the clamp release mechanism 162 is introduced into the furnace vessel 101 through the support frame 163, and the support frame 163 is
17 in an airtight manner. On the other hand, the clamp mechanism 14
When the fuel assembly 102 held at 9 is positioned in the maintenance rack 160 by the flange position selection mechanism and the lifting mechanism, the clamp release mechanism 162 will be positioned directly above the clamp drive body 153. Therefore, perform the following operation.

First, rotate the circular handle 172 in a certain direction to lower the opening/closing operation rod 176 screwed onto the rotating operation shaft 17, and as shown in FIG.
Leave 174 and 175 open.

Next, rotate the operating rod groove 6 in a certain direction to
and guide tube 168 are lowered together. When the lower end of one of the detection rods 179 comes into contact with the contact piece 157 provided at the upper end of the Franz 6 driver 153, the detection rod 179 is prohibited from descending after that. The upper end large diameter portion 179A of the accompanying detection rod 179 is connected to the elevating cylinder 162.
It will protrude from the top of the. Therefore, by observing the large diameter portion 179A from outside the furnace vessel 101, it can be determined that the lower end of the detection rod 179 has come into contact with something.

Then, the operating rod 166 continues to be rotated to further lower the guide tube 168, and when the other detection rod 18θ comes into contact with the upper end of the clamp support 142, the detection rod yrtt.

After that, as the guide tube 168 descends, the upper large diameter portions 179 of both detection rods 179, 180
1.180A comes to protrude from the upper end of the elevating tube 167.

17 Therefore, the large diameter portion 1 of both detection rods 179, 180
791.1801 was observed outside the furnace vessel 101, and the difference in the amount of protrusion between the two was observed between the upper surface of the contact piece 157 and the clamp support 1.
Difference in height from the top of 42 (this value is known in advance)
If it is equal to , it can be determined that the lower ends of the respective rods 179 and 180 have hit the contact piece 157 and the clamp support 142 . Also those rods 179°18
Based on the amount of protrusion of 0, it can also be determined whether the engaging portions 1741 and 1751 of both grippers 174 and 175 are in a position where they can grip the gripping portion 156 of the clamp driving body 153.

In this way both grits'? 174 and 175 reach the position where they can grip the grip part 156 of the clamp drive body 153, the rotation of the operation rod 166 is stopped, and then the circular nozzle 172 is rotated to open/close the opening/closing operation rod 1.
Raise 76.

By this operation, the opening/closing operation section 1 of the opening/closing operation rod 176 is
78 rises and is located between the upper protrusions 174C and 115C of both grips/41'14.175, both retaining parts 17
4B and 115B grip the grip portion 156 of the lamp driving body 153 as shown in FIG.

Next, when the operating rod 166 is rotated five times in the opposite direction to raise the guide tube 168, the clamp driver 153 also rises while being gripped by the grips 7p174, 775. Lower large diameter part 15 of 153
5 is the clamp sliding surface 1 of both clamp claws 147, 148
47C and 148C, the upper large diameter portion 154 enters between the releasing protrusions 147B and 148B, and closes the clamp claws 141 and 148 as shown in FIG. 21. As a result, the clamp mechanism 149 is removed from the fuel assembly 102, so the circular nozzle 122 is operated again to open the grippers 114 and 175, and the clamp mechanism 149 is pulled away from the clamp drive body 153.

Thereafter, the elevator pipe 131, clamp support 142, clamp mechanism 149, links 140, 141, 144, 145, 146, etc. of the fuel exchange device 110 are folded and taken out of the reactor vessel 101 as a unit by the method described above. The clamp drive body 153, clamp mechanism 149, and other parts can be repaired.

As described above based on the embodiments, the fast breeder reactor refueling apparatus according to the present invention has a maintenance rack that can hold fuel assemblies inside the reactor vessel, and A clamp mechanism such as a pair of clamp claws is attached to a clamp support placed in the container, and the clamp drive body is raised and lowered by the clamp drive body operating mechanism inside the furnace vessel, and both of the clamp drive members are brought into sliding contact with the Lanzo claws. This opens and closes the two rung claws, and also includes a clamp position selection mechanism that moves the clamp mechanism in the horizontal direction and a lifting mechanism that raises and lowers the clamp mechanism to move the clamp support, clamp mechanism, clamp drive body, and The clamp driver operating mechanism is configured so that it can be folded up and inserted into and removed from the furnace vessel as a unit, and the clamp driver can also be directly operated by a clamp release mechanism at a position above the maintenance rack. Since the clamp 37 is held with the multi-fuel assembly held by the clamp mechanism,
- When the drive body becomes inoperable, the fuel assembly can be moved to the maintenance rack and then the clamp mechanism can be removed from the fuel assembly by directly operating the cycranzo drive body using the clamp release mechanism. The clamp support, the clamp mechanism, the clamp drive body, and the clamp drive body operating mechanism can be folded and taken out of the furnace vessel as a unit for appropriate repairs.

[Brief explanation of drawings]

Figures 1 to 9 show the background art. Figure 1 is a longitudinal sectional view showing the schematic configuration of a fast breeder reactor, Figure 2 is a plan view, and Figure 3 is a schematic diagram of the fuel exchange device. Fig. 4 is a longitudinal sectional view showing the upper part of the fuel exchange device;
The figure is a longitudinal sectional view showing the lower part of the fuel exchange device, and FIGS. 6 to 8 are longitudinal sectional views showing the clamping operation of the fuel exchange device.
Fig. 9 is a vertical cross-sectional view showing the state in which the fuel assembly is lifted by the fuel exchange device, Figs. 10 to 22 show an embodiment of the present invention, and Figs. A vertical cross-sectional view showing the schematic configuration of! @1
Figure 1 is a plan view, Figure 12 is a vertical cross-sectional view showing the schematic configuration of the fuel exchange device, Figure 13 is a vertical cross-sectional view showing the upper part of the fuel exchange device, and Figure 14 is a vertical cross-sectional view showing the lower part of the fuel exchange device. 15 to 17 are vertical cross-sectional views showing the clamping operation of the fuel exchange device, FIG. 18 is a vertical cross-sectional view showing the schematic structure of the clamp release mechanism, and Figures 19 and 21 are the clamp release mechanism. A vertical sectional view showing the gripper opening/closing operation of the second
0 is a perspective view showing the relationship between the gripper, the detection rod, and the flang drive body, and FIG. 22 is a longitudinal sectional view showing the fuel assembly lifted by the fuel exchange device. 101...Reactor vessel, 102...Fuel assembly, 122...
・Hoisting machine, 127... Guide pipe, 131... Lifting pipe, 1
42... Flange support body, 147, 148... Clamp claw, 149... Clamp operation, 153 - Flange drive body, 160... Maintenance rack, 162...
Clamp release mechanism, 168... Guide tube, 174.17
5...Gripper, 176...Opening/closing operation rod
. Applicant's agent Patent attorney Suzue Takehiko Figure 1, Figure 2Ei Special f? f1[]]058-, 106499 (12) 4th
Figure 3 2 1''/i--1-yo'1 Toro:
:4411! ! IF:': )溺[]]U58-10649903 7th m! ) Fence Show 58-10649904) Fig. 8) Load 1b Fertilizer 8-i06499 (go) Fig. 20

Claims (3)

[Claims] (1) A maintenance rack that is installed inside the reactor vessel and can hold the fuel assembly, a clamp support that is installed inside the reactor vessel, and a pair of clamp claws that are supported by the clamp support so that they can be opened and closed. a clamping mechanism that opens and closes a running claw to clamp or release a flange of a fuel assembly;
A clamp drive body that is arranged to be able to move up and down inside the furnace vessel and slides into contact with the two run claws to open and close them; and a clamp drive body that can be folded together with the clamp support body, clamp mechanism, and clamp drive body to integrally move the inside and outside of the furnace vessel. a clamp drive body operating mechanism that is removably inserted into the furnace vessel and that lifts and lowers the clamp drive body within the furnace vessel; a clamp position selection mechanism that moves the clamp mechanism in a horizontal direction; and a lift mechanism that lifts and lowers the Franz ° mechanism. and a clamp release mechanism which is provided in the furnace container so as to be freely inserted into and removed from the furnace container, and which directly operates the clamp driver at a position above the maintenance rack to cause the clamp mechanism to release the clamp. A fuel exchange device for a fast breeder reactor characterized by the following. (2) The fuel exchange for a fast breeder reactor according to claim (1), wherein the clamp release mechanism is configured to grasp and pull up the upper end of the clamp driver. Device. (3) The clamp release mechanism includes a detection rod that comes into contact with the clamp support body or the clamp drive body from above and detects the position thereof. Fast breeder reactor fuel exchange equipment.