JPS58189591A - Device for transporting fuel of fast breeder - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel transfer device for a fast breeder reactor.

Fast breeder reactor reactor vessel and extra-core fuel needle i1. Recently, a chute system has been adopted for loading and unloading fuel into the cypress, and for this reason, the reactor vessel and the external fuel storage tank are each provided with ramps for loading and unloading fuel.

By the way, as shown in FIG. 6, the movable truck 10 containing the fuel bucket) 3 swings and stops at the slope 7, and the fuel packet drive #Ik device 4 passes the t++ packet 3 through the slope I to the chain 4a. Suspend the spent fuel to the outside fuel gauge i1. I'm putting it in monk 6. Conversely, in order to put new fuel into the core of the reactor vessel 1, which is put into the fuel packet 3 from the external fuel storage tank and lifted by the chain 4a through the ramp 1 by the fuel packet drive device 4, the fuel packet 3 is put into the core of the reactor vessel 1. The movable truck 10 swings and stops at the slope 5, and is suspended by a chain 4aK through the slope 5 by the M class packet drive device 4, and new fuel is introduced into the reactor core 2 of the reactor vessel 1. .

However, in such a fuel transfer device, the radiation level in the fuel transfer cell 9 is extremely low (and workers cannot perform maintenance if the fuel transfer stops during fuel transfer. Especially when an earthquake occurs while the fuel packet 3 is being swung). Considering such a case, it is extremely difficult to design an earthquake-resistant support structure.Furthermore, even if an earthquake does not occur, if the swing device N (not shown) of the fuel packet 3 breaks down during the swing, it is difficult to repair it. Further, in the fuel transfer cell 9, the fuel packet 3
There is some dripping adhesion of sodium from the water, and it is necessary to remove it. Further, there is a drawback that it is extremely difficult to align each fuel packet 3 with the slope 5 by performing a swing operation.

In addition, as shown in FIGS. 2a and bK, the ramps 5 and 1 protruding into the fuel transfer cell 9 are surrounded by a shield 11, and this shield 1
A shielding base 11' is integrally provided on the upper end of the shielding base 11.
In K', a slope conversion body 13 is rotatably provided at a point symmetrical position with respect to the axis center line so as to intersect the fuel storage passages 12 and 12' which respectively communicate with the slopes 5 and 7. A rotary fuel transfer system has been developed which includes a fuel packet drive 4' on a shielding base 11'.

The fuel transfer device having such a structure is configured to transfer fuel from the core 2 of the nuclear reactor 1 to the fuel packet 3 and transfer it to the fuel packet drive device 4'.
The spent fuel lifted by the chain 4a through the slope 5 is put into the fuel storage path 12 of the slope conversion body 13, and on the other hand, it is put into the fuel packet 3 from the extra-core fuel storage tank 6 and is transferred by the fuel packet drive system [4'. The new fuel lifted up by the chain 4aK through the slope T is put into the fuel storage path 12' of the slope conversion body 13. Here, the slope conversion body 13 is rotated by 180 degrees, so that the fuel storage passage 12' containing fresh fuel is communicated with the slope 5, and the fuel storage passage 12 containing spent fuel is communicated with the slope T.

Thereafter, the fuel packet drive device 4' drives the ramps 5 and 7, respectively.
The fuel packet 3 is suspended through the reactor, new fuel is put into the core 2 of the reactor vessel 1, and spent fuel is put into the extra-core fuel storage m6.

However, this fuel transfer device rotates the diagonal conversion body 13 and connects the fuel storage paths 12 and 12' to the diagonals I and 5 (it is difficult to match them, and the fuel bucket 3 is not completely aligned with the fuel storage paths 12 and 12').
If the slope converter 13 is suspended, there is a risk of derailment due to the difference in level between the slopes.If the slope converter 13 breaks down during rotation, the spent fuel is stored in the outside fuel storage tank 6. In this case, it becomes impossible to introduce new fuel into the core 2 of the reactor vessel 1, and repair of the oblique converter 13 becomes difficult.

The present invention has been made in order to solve such problems, and it is possible to move and orient the spent fuel lifted from the core of the reactor vessel through the slope, and the new fuel lifted from the external fuel storage tank through the slope. Fuel transfer for a fast breeder reactor with a slope change so that spent fuel can be lowered into the external fuel storage tank and new fuel can be lowered into the core of the reactor vessel without changing the structure. The aim is to provide the equipment.

The fuel transfer device for a fast breeder reactor according to the present invention has two slopes for carrying in and out of fuel in the reactor vessel and the external fuel storage tank, respectively, and intersects each other within the fuel transfer cell. A shielding base having a truck for hoisting and timing the fuel above the intersection is provided perpendicularly to the upper end of the shielding body surrounding both slopes, and fuel waiting to be transferred to the truck at the intersection of both slopes is provided. A diagonal path conversion device is provided to open the diagonal path, and a fuel packet drive device is provided at the upper end of the shielding base.

An embodiment of the fuel transfer system for a fast breeder reactor according to the present invention will be described below with reference to FIGS. Two slopes 5 and 7 for carrying in and out of fuel are arranged side by side in the container 1 and the out-of-core fuel storage tank 6, respectively, and protrude into the fuel transfer cell 9 and intersect with each other. A shielding base 16 having a truck 15 for waiting fuel is integrally attached to the upper end of the shielding body 11 of the two ramps 5, 7 arranged in parallel above the two ramps 5, 1, each having a truck 15 for waiting fuel. installed vertically. At the intersection of the two slopes 5 and 7, a slope conversion Mt17 is provided which connects the truck 15 with the slope for transferring the fuel parked in the truck 15 in the shielding tower Iti. To explain the details of this slope conversion device 17, a bracket 18 (see FIG. 3C) inside the shielding base 16 is located below the track 15 of the shielding base 16.
K. A movable track 19 that communicates with either of the tracks 5m or 7m of the slopes 5 or 7 is rotatably supported downward, and the movable track 19 is linked to a movable rack drive device via a drive force transmission mechanism. ing. That is, in this example, worm wheels 20 are fixed to both outer surfaces of the movable rack 19, and each worm wheel 20 is provided with a worm 21.
The worm 21 is fixed on a rotating shaft 23 through which the shield 11 of a movable rack drive device 22 provided on the outer surface of the upper end of the shield 11 can be passed. Guide rollers 24 are provided at the lower ends of both outer ridges of the movable track 19, and each guide roller 24 is connected to the track Sa of both slopes 5, 7.
The shield 11 is configured to run and rotate on an arc-shaped guide rail 25 installed between the left and right inner circular surfaces of the shield 11 on the outside of the upper end of the shield 11.

The upper ends of the tracks 5a and 7a of both the slopes 5 and 7 are cut out at the center of both left and right sides, and a movable track 19 and a shielding base 1 are formed.
It has a structure in which the groove members are uniformly opposed to the tracks 15 of No. 6, and the fuel packets are transported to the tracks 5a of slopes 5 and 7.
7a through the movable track 19 to the tracks 15 of the shielding base 16, the fuel bakut is transferred to the II of each track.
mKfi is no longer available. Reference numeral 26 denotes a drum provided inside the upper end of the shielding base 16, around which a chain 27 for hoisting the fuel packet is wound.
K is designed so that it can be rotated in forward and reverse directions compared to BK. 29
29' is a closing device which includes both ramps 5, 7 within the fuel transfer cell 9.

Next, the operation of the fuel transfer device configured as described above will be explained. Spent fuel in the core 2 of the reactor vessel 1 is put into the fuel packet 3, and the drum 26 is rotated by the fuel packet drive device 28, and the drum 26 is rotated to the track 5 on one of the slopes 5 of the two parallel fuel packets.
The fuel packet 3 is lifted up by a chain 21 through the chain 21 through the slanted path 5, and placed in one of the vertical tracks 15 in the shielding base 16 via the movable track 19, and is placed on standby. In addition, fresh fuel from the outside fuel storage tank 6 is put into the fuel packet 3, and the drum 26 is rotated by the fuel packet drive device 28K, and the fuel is passed through the track 7a of the other slope 7 of the two units installed in parallel by the chain 27. The packet 3 is lifted up and put into the other vertical track 15 in the shielding base 16 via the movable track 19 from the track 7a of the slope T, and is put on standby. During this standby, one movable track drive &[t22 is rotated forward, and the other movable track drive device 12
Reverse the worms 21 and 21. Worm wheel 2
0, rotate one movable track 19 from the track 5a@ of the slope 5 to the track 7a@ of the slope T, and rotate the other movable track 19 from the track 73 side of the slope 7 to the track 5all JK of the slope 5. do. At this time, the rain movable track 19 is smoothly moved on an arcuate rail 25 by guide rollers 24.

Both movable tracks 19 are tracks 7a each having a slope γ.

If #i miracle 5a of the slope matches, the drum 26 is reversely rotated by the fuel packet drive device 28, and the shielding base 1
The fuel packet 3 containing the spent fuel is suspended from the truck 7aK on the slope 7 via the movable truck 19 from one truck 15 in the fuel tank 6, and is stored in the extra-core fuel storage tank 6. The fuel packet 3 containing new fuel is suspended from the trunk 51 of the ramp 5 via the movable truck 19 and housed in the reactor core 2 of the reactor vessel 1.

Incidentally, the slope conversion device fl1 in the fuel transfer device of the present invention
7 is not limited to the above embodiments, for example, W7c47
It may also have a structure a, b, or cK. To explain this in detail, track 5 of slope 5 of reactor vessel 1
m and the out-of-core fuel storage tank 6σ] intersection K with the track 7a of the slope T, a movable track that connects either of the tracks 5a, 7a of the two slopes 5, 7 to the track 15 in the bell tower 16 30 is pivotally supported by a bracket 31 (see FIG. 4C) in the shielding base 16 so as to be rotatable upward, and the movable track 30
is connected to the movable rack drive device via a drive force transmission mechanism. That is, in this example, worm wheels 32 are fixedly installed on both outer surfaces of the movable rank 190, and a worm 33 is meshed with each of the worm wheels 32.
3 is fixed on a rotary shaft 35 that can pass through the shield 11 of a movable rack drive device 34 provided on the outer surface of the upper end of the shield.

The slope conversion equipment having such a structure is configured to use one movable truck 30 in order to lift the fuel packet 3 containing the spent fuel from the core 2 of the reactor vessel 1 into one truck 15 of the transportation tower 16 and put it on standby. The tracks 7allK of the slope 1 are rotated and closed, the track 51 of the slope 5 is connected to one of the trucks 15, and the fuel packet 3 containing fresh fuel is lifted from the outside fuel storage tank 6 in the other truck 15. To make you wait,
Rotate and close the other movable track 30 to the track 5 of the slope 5, and turn the track 1a of the slope 1 to the other track 1.
Connects with 5.

and fuel buckets containing spent fuel kept on standby in each truck 15)3. ; To the fuel tank 37 containing tr fuel:, outside the reactor fuel storage tank 6. When entering the reactor core 2 of the reactor vessel 1, contrary to the above, one movable track 30 is rotated to the track 5a side of the ramp 5 and closed, thereby communicating the one track 15 with the track 7a of the ramp 7. The other movable track 30
The track 7al@ of the slope 1 is rotated and closed to communicate with the other track 15 and the track 5a of the slope 5.

As can be seen from the above explanation, the fuel transfer device according to the present invention is
Spent fuel placed in fuel packets from the core of the reactor vessel and hoisted up to one truck in the shielding tower through a sloping truck, and fuel buckets from the external fuel storage tank? The new fuel is transferred to the truck in the shielding tower containing the spent fuel and the fuel storage outside the reactor without having to move or change the direction of the new fuel, which is hoisted through a truck on the slope to the other truck in the shielding tower. By connecting the truck on the slope of the tank, and the truck inside the shielding tower containing fresh fuel and the truck on the slope of the reactor vessel through simultaneous rotation of movable trucks, it is easy to enter spent fuel. The fuel packets containing fresh fuel can be suspended into the ex-core fuel storage tank, and the fuel packets containing new fuel can be suspended into the core of the reactor vessel. In addition, since fuel is not held in the movable truck that opens the inclined track for transferring fuel, even if an earthquake occurs when the movable truck rotates, the fuel remains stationary, fixed and supported, and is safely supported. Furthermore, even if the movable track breaks down during rotation, it is easy to repair because it does not hold fuel. Furthermore, since two units are installed in parallel, even if one unit breaks down, the other unit can alternately transfer spent fuel and new fuel.

In addition, the fuel transfer device of the present invention does not require rotation of the track in the shield tower that lifts and accommodates fuel packets containing spent fuel or new fuel, so the fuel packets are vertically attached to the track in the shield tower without any external force. The angle θ1. of the slope track of the reactor vessel and the slope track of the external fuel storage tank with respect to the vertical direction is within the range that can be lifted and accommodated in the direction. θ2 does not have to be the same and can be selected relatively freely. Therefore, the reactor vessel, ex-core fuel storage tank, J! ! Even after the location of the fuel transfer system of the present invention has been decided, it is relatively easy to arrange the fuel transfer device of the present invention.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an example of a conventional fuel transfer device for a fast breeder reactor, Fig. 2 is a schematic longitudinal sectional view showing another example of a conventional fuel transfer device for a fast breeder reactor, and Fig. is A- in figure a.
Figure 3 shows an example of a fuel transfer device for a fast breeder reactor according to the present invention;
Figure 4 shows another example of the slope conversion device in the fuel transfer device for a fast breeder reactor according to the present invention. a is a vertical cross-sectional view, b is a cross-sectional view taken along line D-D in figure a, and C is a cross-sectional view taken along line E-Im in figure a.
! FIG. 1... Reactor vessel 2... Core 3... Fuel packet 5, 7... Inclined road 5a, 7a... Inclined track 6... External fuel storage tank 9...
Fuel transfer cell 11... Shielding body 15... Truck 16... Lotus shielding tower 11... Slope conversion device 18... Bracket 19... Movable track 20
... Worm wheel 21 ... Worm 22.
・・Movable rack drive unit fi1 23 ・・Rotating shaft 24
...Guide roller 25...Guide rail 26.
- Tram 21... Chain 28... Fuel packet drive device 29, 29'... Slope closing device 30... Movable track 31... Bracket 32... Worm wheel 33... Worm 34. ...Movable track drive device 35...
Rotating shaft applicant Kawasaki Heavy Industries, Ltd. Applicant Central Research Institute of Electric Power Industry Representative Patent attorney Yuji Taka Department Figure 3 (C)

Claims (1)

[Scope of Claims] 1) Two slopes for carrying in and out of fuel are installed in parallel in the reactor vessel and the external fuel storage tank, respectively, and intersect within each fuel transfer cell, and above the intersection of these slopes. A shielding base having a truck for hoisting and waiting the fuel is installed perpendicularly to the upper end of the shielding body surrounding both the slopes, and a slope for transferring the waiting fuel to the truck is opened at the intersection of the two slopes. 1. A fuel transfer device for a fast breeder reactor, comprising: a slope converting device for converting a slope; and a fuel packet drive device provided at an upper end of the shielding base. 2) The slope converting device includes a movable track that is pivoted downward under the track in the shielding tower and communicates with one of the tracks of each slope, a drive device for swinging the movable track, and the drive. A fast breeder reactor according to claim 1, characterized in that the fast breeder reactor comprises a driving force transmission mechanism that connects the device and a movable knob, and an arcuate guide rail that guides the swing movement of the movable track. fuel transfer device. 3) A slope conversion device is movable, which is pivoted upward at the intersection of the slope tracks of the reactor vessel and the ex-core fuel storage cypress, and communicates the track in the shielding tower with either of the tracks of the both slopes. 1! Consisting of a track, a drive device for rotating the movable track, and a driving force transmission mechanism that connects the drive device, the movable truck, and the rack! ! A fuel transfer device for a fast breeder reactor as claimed in claim 1.