JPS6011199A - Water sampling device in shipping device - 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 water sampling device in a shipping device used to detect the presence or absence of damage to a nuclear fuel assembly. Some nuclear fuel assemblies have some fuel rods that break or develop pinholes due to continuous operation of the reactor, causing the fission products generated inside to leak out. Even if there is some life remaining, it cannot be used for safety reasons, and therefore it is necessary to know which fuel assemblies are damaged or not, and therefore, the shipping equipment is used to remove the spent fuel assemblies. Regular inspections are being conducted.

As shown in FIG. 1, this shipping device has a shipping can 1 with an air jacket 1b around it placed in a storage pool p, and a fuel assembly n to be inspected is transported to the shipping can by opening and closing the cap 1a. Jacket gas is sent into the surrounding air jacket 1b to expel the pool water therein to form a heat insulating layer, and its heat insulating action causes the fuel rods in the assembly to self-heat, allowing the fuel rods to heat up from the damaged part of the cladding. The fission products generated inside the can are leaked out, and the gaseous products are carried outside the can by carrier gas (nitrogen gas) fed into the can from below, causing the xenon-133 contained therein to rise. In the case of water-soluble fission products, the water in the shipping can 1 is sampled.
The purpose is to measure the a degree change in iodine 131 and cesium 137 contained therein to determine the presence or absence of damage to the nuclear fuel assembly n.In collecting the water in the shipping can 1, A pump 3 placed next to the pool is operated to pump up water from the can via branch pipes 2a, 2b, 2c and pipes 2 that are connected to the shipping can 1 in several stages, and an electromagnetic switching valve 4 is activated. A required amount is collected through a filter 5 into a polyvinyl bottle 6 placed on a scale stand 17, and then set in an Ill measuring device.

By the way, up until now, all operations during radioactivity tests, such as opening and closing the caps of bottles, setting them on the weighing table, operating the switching valves, and moving them to the measuring instruments, have been done manually.
Therefore, even if the potato grower does not directly touch the sampling water, he or she will come into contact with the radioactively contaminated bottles, and the possibility of being called out is extremely high. Therefore, this invention was devised in view of these circumstances, and it fully automatically performs a series of operations such as opening and closing the cap, setting the bottle, operating the switching valve, and moving the device to the measuring device. Provides a water sampling device 6°- that can prevent danger,
A pipe is connected to the shipping can in the pool, and a pump placed next to the pool pumps up the water in the shipping can, and the required amount of water is injected into a synthetic resin bottle through a filter. Two conveyors are installed nearby, one running forward and the other running backwards. On the rear end of the conveyor is a hopper that supplies bottles one by one onto the seven conveyors running forward, and On the side of the running conveyor, there is a radiation measuring device 6 and an opening/closing device 11 at the tip.
A second bottle moving machine consisting of an arm member that is equipped with a holding device and is extendable and horizontally rotatable is disposed 2, and in the middle of the conveyor there is a rotatable gripping claw 7 at both ends of the horizontal arm that can be raised and lowered. A cap attachment/removal device that rotates half a rotation intermittently and a bottle restraint device that opens and closes from side to side are installed, and on the side of the front end of the above conveyor, a container that opens and closes at the tip]1. It is characterized in that a first bottle moving device consisting of an arm that rotates horizontally between the conveyor and the conveyor is provided, and each of the above-mentioned devices is controlled by a control computer.

To explain the embodiment with reference to the drawings, in FIG. ) runs from the rear to the front, and the front one (on the left side in the figure) runs from the front to the rear. A hopper 11 containing a required number of polyvinyl bottles 6 with caps is provided, and a vibrator lla is activated by a command from a control computer 25 to raise the bottles 6 one by one as necessary and place them on the conveyor 10. In addition, on the side of the rear end of the Ikata running conveyor 1σ, there is an arm 12 which is equipped with an opening/closing tool 12c at the tip and is extendable and retractable and can be rotated left and right with respect to the column 12a.
A second bottle moving device 12 consisting of b is installed, stores a certain amount of sample water therein, grabs the bottle 6 sent from the front with a conopear 1σ, and carries out measurement supported by the cylinder part 20. It is arranged so that it can be transferred onto a table 21.

On the other hand, a cap attachment/removal machine 13 is disposed on the front end of the parallel conveyors 10 and 10'.
3 is a rotating member 13 which can be raised and lowered by a cylinder member 13c.
d, a vertical shaft 13a that rotates left and right intermittently, a horizontal arm 1'3b attached to its lower end so as to straddle the left and right conveyors 10, 10', and a small motor 13e supported at both ends of the vertical shaft 13a, and a small motor 13e supported at both ends, The gripping claws 13 are configured to rotate several times in a clockwise or counterclockwise direction.
.

A first bottle moving machine 15 and a filter gripping machine 16 are arranged on the side of the front Q'A section of the rear running conveyor 10' on the left side, with the respective supports 15a and 16a superimposed on the same axis, and the bottles are moved. The support 15a of the machine 15 has an opening/closing grip 1 at its tip.
A telescopic arm 15)) having a diameter 5c is attached so as to be rotatable left and right, and another support 16a is vertically telescopic and has a filter clamp 16c hanging from its top end. The provided arm 16b is rotatably mounted.

In front of the bottle moving machine 15 (i!+1) is a weighing stand 17, and above the weighing stand 17, the water inlet of the pipe 2 for collecting sample water is arranged at an interval of the height of the bottles. , an inverted U-shaped cation filter 5 detachably attached to the water discharge end of the pipe 20'i, and the electromagnetic switching valve 4.
Shipping can 1 in storage boule p via pump 3
It is connected in several stages.

On the 4th day of the weighing platform 17 (1)
A switch 18 equipped with a stylus for checking the presence or absence of a cap on the bottle 6 is attached to the support column 18aσ) on the upper candy 1'1 so as to rotate up and down. A filter confirmation sensor 19 such as a phototube is provided on the side. Furthermore, a measurement box 22 made of radiation shielding material is arranged above the measurement table 21 at the rear.
This measurement box 22 is directly connected to a multichannel rare analyzer 24 on a control computer 25 via an NaJ scintillation counter 23 fixed to one side wall.

Then, as shown in Figure 3, pump 3. Pulp 4° hopper 11. Belt conveyor 10, 10', bottle ゛Move a!
12,15. Camping edition 13. Bottle restraint 14. The filter gripper 16, measuring instruments, etc. are all connected to a control computer 25, and their operations are programmed in advance and sequentially controlled.

Therefore, when the nuclear fuel assembly n to be inspected is placed in the shipping can 1 as shown in Fig. 1 and the start switch of the device is turned on, the belt conveyor 10 running forward on the left starts running and the following steps are taken: The Evebrake lla is started, and one bottle 6 comes out of the Hotsunoku-11 while opening the lower cover, and is placed upright on the conveyor 10. And 1
When one bottle 6 is taken out, the vibrator 11a stops at the trench where the next command comes, and the lower lid of the hopper 11 is closed.

When the bottle 6 placed on the belt conveyor 10 comes under the thread attachment/removal machine 13, the conveyor 10 stops and the elastic member 1
4b is activated and the deterrent 14 approaches the bottle 6 as shown by the dotted line.
At the same time, the vertical shaft 13 of the cap attachment/detachment machine 13
a extends, the horizontal arm 13b descends, and the gripping claw 13f at the right end grips the cap of the bottle 6, and rotates counterclockwise due to the operation of the motor 13e, and rises due to the contraction of the vertical shaft 13a to remove the cap from the bottle 6. Remove.

After that, the vertical shaft 13a rotates half a turn, and the gripping claw 13f that grips the cap moves onto the left conveyor 10' and is in a standby state, and the bottle 6 with the cap removed is moved forward by the right conveyor 10. It comes to the side of the 11th bottle moving machine 15 and stops.

Then, the first bottle moving machine 15 car starts 10, arm 15b
At the same time as the arm rotates horizontally toward the conveyor side, the user grips the bottle 6 on the conveyor 10 with the opening/closing grip 15c, and then the arm 15b (rotates in the opposite direction and weighs the bottle 6) Place it on the stand 17 and open the I11 shell tool 15c while holding the arm 1.
5b shrinks.

Next, the switch 18 is rotated downward to bring the stylus into contact with the mouth of the bottle to check for the presence or absence of the cap. Once the confirmation is complete, switch 18 switches to the upper blade.

Thus, when it is confirmed that the bottle 6 on the scale stand 17 has no cap, the boule is activated and the sample water in the shipping can 1 is pumped up through the vibrator 2. At this time, in order to replace the water in the pool 2 (for about 30 seconds initially), the pumped water is returned to the pool from the valve 4 through the return pipe 2'. After the required time has elapsed, PAL/4 is switched, and the sample water passes through the cation filter 5, which removes fission products in the cation state (mainly metal ions) and releases them which are easy to count. Water containing iodine is poured into the water inlet 6. When it is detected by the scale stand 17 that the required amount of water has entered, the pump 3 is stopped and the water is poured into the first bottle. The arm 15b of the moving machine 15 extends again and grabs the bottle 6 on the scale stand 17 with the gripper 15c, and the arm J
5 b rotates while shrinking into a violet, and moves the bottle 6 to the left (1
1i on the belt conveyor 10', and the gripping tool 15c
The arm 15b is opened and rotated in the opposite direction while further contracting, returning to the original position 1rJf, VC4.

- When the bottle 6 containing the sample water is placed, the conveyor 10' runs backwards, and when the bottle 6 falls under the cap shoulder remover 13, the conveyor 10' stops. As before, the bottle 6 is held down by the restraining device 14, the vertical shaft 13a extends, and the gripping claw 1, which is waiting to grab the cap,
3f now rotates clockwise and descends to reach bottle 6.
Tighten the cap over the mouth of the

After that, the vertical shaft 13a is reduced and the gripping claw 13f is raised, and at the same time the conveyor 1σ is restarted, and the bottle 6 in the cap position is restarted.
is sent to the rear.

Thus, when the conveyor 10' reaches a predetermined position, the conveyor 10' stops, and the arm 12b of the second bottle moving device 12 rotates horizontally while extending, grabs the bottle 6 with the gripping tool 2c, and then The bottle 6 is rotated in the opposite direction to transfer the bottle 6 onto the measuring table 21, and the bottle 6 is grasped and opened], and the arm 12b is contracted back to its original state.

When the arm 12b retreats, the cylinder member 20 extends and
The 1i1 fixed table 21 is raised, and the bottle 6 containing the sample water is inserted into the measurement box 22.

Therefore, the radioactivity intensity of the sun flu water is measured by the NaI scintillation counter 23, and the result is analyzed by the multi-channel analyzer 24 to detect whether or not the fuel assembly n is damaged.

When the inspection of one fuel assembly n is completed, the
f is taken out from the shipping can 1, and another aggregate n is placed therein, and the presence or absence of a broken fence is detected using the same procedure as above.

In addition, it is recommended to replace the cation filter 5 used for collecting sample water periodically in consideration of the decrease in its ion exchange ability.
'6c and pulled out from the pipe 2 and replaced with a new filter 5, 11. Ru.

The presence or absence of the filter 5 in the fixed position is confirmed by the seven sensors 19.

As described above, according to the present invention, supply of sample bottles,
Operations such as attaching and detaching the cap, moving it to the specified position, and setting it are fully automatic.This eliminates the risk of the committee members coming into direct contact with bottles of radioactive sample water during water sampling. , and there is no need to enter radiation-controlled areas, so there is no risk of exposure. By using a cation filter as a filter, we measured the water with only iodine remaining among the radioactive substances leaking from the damaged fuel, so the detection reliability was high, and the sampling work was improved by automation. It can be carried out quickly and reliably.

[Brief explanation of the drawing]

FIG. 1 shows a schematic diagram of the shipping device. c explanatory diagram. FIG. 2 is a diagram showing an embodiment of this invention. FIG. 3 is a block diagram of each component. In the diagram, ■...Shipping can, 2...Pipe, 3
... Pump, 4... Solenoid switching valve, 5... Cation filter, 6... Bottle, ]0, 10'... Belt conveyor, 11... Hopper, 12... Second bottle Moving machine, 13... Cap straightening machine, 14... Bottle restraint device, 15... First bottle transfer i+8II gun, 16... Filter 41?4 machine, 17... Scale stand, 21 ...Measurement stand, 22.Measurement box, 23..NaI scintillation counter, 24..Multi-channel analyzer, 25..Control computer. Patent applicant Makoto Sanada - Nobumasa Tehoro, representative of Nuclear Fuel Industry Co., Ltd. Water sampling device 3, 1'I in shipping equipment
i*Relationship with the case of the person who made the correction Patent applicant representative Miyazawa Tetsuro 4th generation Ri person Figure 1 6 of the person's drawing Contents of the amendment The changeover valve in the upper right corner of Figure 1 was written in red in the attached drawing. Add code 4 and mark it.

Claims (2)

[Claims] (1) A device that connects a pipe to a shipping can in a pool, pumps up water from the shipping can to a bonder placed next to the pool, and injects the required amount of water into a synthetic resin bottle via a filter. Two conveyors are disposed near the pool, one running forward and the other running backward, and a hopper on the rear end of the conveyor that supplies bottles one by one onto the conveyor running forward; On the side of the rear conveyor, there is a radiation measuring device and a second arm consisting of a horizontally rotatable arm with an opening and closing device at the tip.
A bottle moving machine is installed, and in the middle of the conveyor, a horizontal arm that can be raised and lowered has rotatable gripping claws at both ends, a cap attaching/removing machine that makes half a rotation intermittently, and a bottle restraint that opens and closes from side to side. On the side of the front end of the conveyor, there is provided a first bottle moving device consisting of an extendable arm with an opening/closing grip at the tip and rotating horizontally between the weighing platform and the conveyor, and a first bottle moving device is provided on the side of the front end of the conveyor. A water sampling device for a shipping device, characterized in that it is controlled by a control computer. (2) A water sampling device according to Patent BK, characterized in that the filter at the water injection end of the pipe for pumping up water is a cation filter.