JPS5933871B2 - Site bunker - automatic operation control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a site bunker automatic operation control device in a radioactive waste treatment system of a nuclear power generation facility.

Until now, radioactive waste treatment systems in nuclear power generation facilities have been configured primarily to treat contaminated gas or liquid.

However, with the steady operation of nuclear power generation facilities, it has become necessary to repair the internal structures of electronic reactors and to store spent fuel that will be reprocessed for a long period of time.

By the way, nuclear reactor internals and spent fuel have high radiation levels, so they must be stored safely for long periods of time.

For this reason, a site bunker is installed separately from the fuel pool in the reactor building.

Up until now, the water quality in the pools in the site bunkers had been maintained at a good quality by operators operating the site bunkers manually from time to time.

Therefore, it is a burden on the operator, and there is a risk that the water quality in the site bunker will not be maintained at a good level due to human error such as the operator forgetting to operate the site bunker.

The present invention was made in order to eliminate the above-mentioned drawbacks, and provides a site bunker automatic operation control device that can automatically operate the site bunker and maintain the water quality of the site bunker reliably and well over a long period of time. The purpose is to provide.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of the present invention.

1 is a pulley or unloading pit used to take out reactor internals, spent fuel, etc. from a cask, etc., and 2 is the first site bunker pool where reactor internals, spent fuel, etc. are stored. and 3 is the first
This is a second site bunker pool having the same structure as the site bunker pool.

A gap pipe 5 is connected to the gap salt 4 of the unloading pit 1, a gap line 7 is connected to the gap salt 6 of the first site bunker pool 2, and a gap salt 8 of the second site bunker pool 3 is connected. A gap piping 9 is connected to.

The other end of the gap piping 5, 7, 9 is the main gap piping 10.
are commonly connected.

The end of this gap piping 10 is connected to the upper part of the gap surge tank 11.

At the bottom of the above-mentioned skimmer surge tank 11 is a main circulation pipe 1.
2 is connected to one end, and the other end of the main circulation pipe 12 is connected to a circulation pump 13 for forcedly circulating the circulating water from the skimmer surge tank 11, a flow rate control valve 15 for regulating the flow rate of the circulating water, After passing through the purification device 14 that purifies the circulating water, the unloading pit 1, the first site bunker pool 2,
It is led to the vicinity of the second site bunker pool 3.

The unloading pit valve 1 is connected to the circulation main pipe 12 which is led to the vicinity of the unloading pit 1, the first site bunker pool 2, and the second site bunker pool.
6. The inlets of the branch piping 17 are connected via the first site bunker pool valve 18 and the second site bunker pool valve 20, respectively.

Respective outlet portions 17A, 19A of branch pipes 17, 19, 21.

21A are installed near the bottoms of the unloading pit 1, the first site bunker pool 2, and the second site bunker pool 3, respectively.

The unloading pit 1, the first site bunker pool 2, and the second site bunker pool 3 are filled with water to prevent radiation emitted from reactor internal structures, spent fuel, etc. from leaking outside. ing.

Note that when the water filled in the unloading pit 1, second site bunker pool 2, and second site bunker pool 3 exceeds the respective clearance salts 4, 6, and 8, the clearance pipes 5, 7, 9 and the main gap pipe 10 to flow into the gap surge tank 11, and the level of water is adjusted.

The unloading pit selection valve 16, the first site bunker pool valve 18, the second site bunker pool valve 20,
The circulation pump 13 and the flow control valve 15 are sterilized by the site bunker automatic operation control device 22.

The site bunker automatic operation control device 22 includes an operation panel including a start/stop switch panel 23, a selection switch panel 24, and the like.

FIG. 2a shows the buttons on the start/stop switch board 23, and FIG. 2b shows the buttons on the selection switch board 24.

The start/stop switch panel 23 has a circulation switch button 25 for starting the site bunker automatic operation control device 22, a stop switch button 26 for stopping the device 22, and an alarm lamp 27 that indicates an abnormality in the device 22. There is.

The selection switch board 24 includes a first pool switch button 28 that allows you to select the first site bunker pool 2, a second pool switch button 29 that allows you to select the second site bunker pool 3, and a pit switch button that allows you to select the unloading pit 1. 30, and an automatic selection switch button 31 that can automatically select the first site bunker pool 2, the second site bunker pool 3, and the unloading pit 1.

Note that both switch buttons are illuminated switch buttons that light up when they are in operation.

Figure 3 shows the site bunker automatic operation device 2 shown in Figure 1.
2, the same parts as in FIG. 1 are given the same reference numerals.

A signal PSE from the start/stop switch panel 23, a signal TS from the skimmer surge tank water level detector 32 that detects that the water level in the skimmer surge tank 11 is above a predetermined level, and radioactive waste (not shown) The signal FS from the system valve fully closed detector 33 that detects that the related valve in the processing system is fully closed is the circulation determination circuit 34.
is input.

This determination circuit 34 first determines that the stop switch button 26 is off when the circulation switch button 25 of the start/stop switch panel 23 is on, and then It is determined that the signal TS is on, and (2) it is further determined that the signal FS from the system valve fully closed detector 33 is on.

When all the conditions are satisfied as a result of these determinations, a signal R8 is sent out to light up the circulation switch button 25 of the start/stop switch panel 23.

Further, the signal R8 is also applied to the valve selection circuit 35.

In addition, if the conditions are not met in each of the above judgment steps, it is determined that the circulation conditions are inadequate and a signal TS is sent to the stop device 36.
Send out.

The valve selection circuit 35 receives the signal R8 and the selection switch board 24.
When any of the first pool switch 28, second pool switch 29, and unloading pit switch button 30 is on, the signal H8 is sent to the selection valve opening/closing device 37. , when the automatic switch button 31 is on, an automatic circulation signal AUS is sent to the automatic valve selection device 38.

The selection valve opening/closing device 37 operates the unloading pit valve 16 and the first site bunker pool valve 1 based on the signal H8.
8. Fully close the second site bunker pool valves 20 other than the selected valve, and then fully open the selected valve.

The automatic valve selection device 38 inputs the signal AUS and sends an automatic selection signal AC8 to the selection valve opening/closing device 37.

The selection valve full open detector 39 sends a signal FSO to the full open determination circuit 40 when the valve selected by the selection switch 24 is fully open.

This fully open determination circuit 40 receives the signal FO8 and the signal R8, and sends a signal PDS to the circulation pump drive device 41 that drives the circulation pump 13 when both signals are on.

The circulation pump drive device 41 forcibly circulates the circulating water based on the signal PDS.

The circulation pump 1 drive detector 42 detects that the circulation pump 13 is operating and sends a signal PNS to the pump determination circuit 43.

This pump determination circuit 43 inputs the signal R8 and the signal PNS, and sends out the signal FC8 to the flow control valve opening/closing device 44 when both signals are on.

The flow rate control valve opening/closing device 44 opens the flow rate control valve 15 at a slow speed that prevents water hammer from occurring in the main circulation pipe 12 until the flow rate of circulating water reaches a set flow rate based on the signal FC8.

The delay circuit 45 is set to a value larger than the time required for the flow control valve 15 to complete its operation after the circulation switch button 25 is turned on, and is activated when this set time has elapsed to determine whether or not to stop the signal DLS. The signal is sent to circuit 47.

The flow rate control valve fully closed detector 46 detects that the flow rate control valve 15 is fully closed and sends a signal CLS to the stop determination circuit 47.

The stop judgment circuit 47 inputs the signal R8, the signal DLS, and the signal CR8, and starts or starts when all the input signals are on.
Warning lamp 27 of the stop switch panel 23 and the stop device 3
A stop signal STS is sent to 6 and 6.

The stop device 36 inputs the signal ST and the signal STS, and when either signal is on, the flow control valve opening/closing device 4
4 to fully close the flow rate control valve 15,
Thereafter, a circulation pump stop signal PSD is sent to the circulation pump drive device 41 to stop the circulation pump 13, and then a selection valve fully closed signal SVC is sent to the selection valve opening/closing device 37 to close the unloading pit valve 16 and the first site bunker pool. The valve 18 and the second site bunker pool valve 20 are fully closed.

FIG. 4 is a block diagram of the automatic valve selection device 38 of FIG. 3.

Note that the same parts as in Fig. 3 are given the same reference numerals.

The automatic valve selection device 38 is composed of a timer selection circuit 48 and a timer device 49.

FIG. 5 is a diagram simply showing the configuration of the timer device 49.

The timer device 49 sends out a signal AC8A for selecting the first site bunker pool 2 to the selection valve opening/closing device 3T.
It is formed by a timer 50, a second timer 51 that sends out a signal AC8B that selects the second site bunker pool 3, and a pit timer 52 that sends out a signal AC8C that selects the unloading pit 1.

The timer selection circuit 48 is activated when the automatic switch button 31 is on and the signal AUS is input;
1 is inactive, the activation signal TSLA is sent to the first timer 50.
■When the first timer 50 completes its operation and the pit timer 52 is inactive, sends an activation signal T to the second timer 51.
(2) When the second timer 51 has completed its operation and the first timer 50 is inactive, the operation signal TSLC is automatically sent to the pit timer 52.

Therefore, the first timer 50, second timer 51, and pit timer 52 are automatically selected by the timer selection circuit 48 in the order of first timer, second timer, pit timer, first timer, etc., as shown in FIG. It looks like this.

Since the settling time of each timer is set to T (for example, 24 hours), the operating timer is switched every settling time T.

Further, the first timer 50, the second timer 51, and the pit timer 52 have a stepping function, and when switching to manual operation during automatic operation, for example, after time t1 after the second timer 51 starts operating, the selection switch is switched. When the first site bunker pool 2 is selected by 24 and manually operated for a time t2, the second timer 51 is temporarily stopped during this time t2.

Then, when the automatic switch button 31 is turned on again and the automatic circulation signal AUS is sent to the automatic valve selection device 38, the second timer 51 starts operating again until the settling time T is reached, that is, the time T-t. progress.

In the above configuration, when the circulation switch button 25 is turned on when the water level in the skimmer surge tank 11 is above a predetermined level and the related valves of the system are fully closed, the circulation determination circuit 34 sends out the signal R8. The circulation switch lamp lights up to notify that the selection switch panel 24 may be turned on.

When a button other than the automatic switch button 31 on the selection switch panel 24, for example, the first pool switch button 28, is turned on, a signal H8 is sent from the valve selection circuit 35 to the selection valve opening/closing device 3.
T, and the first site bunker pool valve 18 is fully opened.

Then, a signal FO8 is sent from the selection valve fully open detector 39 to the fully open determination circuit 40.

This fully open determination circuit 40 sends a signal PDS to the circulation pump 1 drive device 41, and the circulation pump 13 starts operating.

For this reason, the signal PNS is sent from the circulation pump drive detector 42 to the pump determination circuit 43.

This pump determination circuit 43 sends a signal FC8 to a flow rate control valve opening/closing device 44, and the flow rate control valve 15 is opened until a predetermined flow rate is reached.

Then, the circulating water passes through the flow rate control valve 15 and the purifier 1
4, passes through the first site bunker pool valve 18, and is discharged into the first site bunker pool 2 from the outlet portion 19A of the branch pipe 19.

At this time, the circulating water overflowing from the gap weir 6 passes through the gap piping 1 and the main gap piping 10 to the gap surge tank 11.
flows out to

The circulating water in the skimmer surge tank 11 is then led to the circulation pump 13 by the main circulation piping 12, and after being given a new circulation force by the circulation pump 13, it passes through the flow rate control valve 15 again.

By repeating the cycle described above, the water quality in the first site bunker pool 2 is maintained at a good level.

Note that when the second pool switch button 29 or the pit switch button of the selection switch panel 24 is turned on, the water quality of each pool is maintained at a good level through the same process as described above.

Next, when the first timer 50, the second timer 51, and the pit timer 52 are all inoperative, the automatic switch button 31
When turned on, an activation signal TSLA is sent from the timer selection circuit 48 to the first timer 50.

Then, the first side I/bunker pool valve 18 is fully opened for a settling time T as shown in FIG. 6 by the selection valve opening/closing device 37.

After the first site bunker pool valve 18 is fully opened for the settling time T, the second timer 51 is automatically selected and operated again by the timer selection circuit 48, and the second site bunker pool valve 20 is similarly set. It is fully opened for time T.

After the second site bunker pool valve 20 is fully opened for a time T, the pit timer 52 is automatically selected and activated again by the timer selection circuit 48, and the unloading pit valve 16 is fully opened for a settling time T. .

Thereafter, the first timer 50, second timer 51, and pit timer 52 are automatically selected in this order by the timer selection circuit 48, and accordingly, the first site bunker pool valve 18 and the second site operate in accordance with each timer. The bunker pool valve 20 and the unloading pit valve 16 are fully opened in sequence.

In this way, the water in the first site bunker pool 2, second site bunker pool 3, and unloading pit 1 is periodically circulated and purified, so that the water quality can be maintained at a good level at all times.

Next, when it becomes necessary to purify the water of other pools as a result of the pool water quality sampling test during the automatic operation of the site bunker described above, for example, while the first site bunker pool 2 is being purified, the second site bunker pool When it becomes necessary to purify the pool, the second pool switch button 29 can be turned on.

Then, the first Kuima 50 temporarily stops operating, the first site bunker pool valve 18 is fully closed, and the second site bunker pool valve 20 is fully opened, and the water in the second site bunker pool 3 is circulated and purified. Ru.

After the water in the second site bunker pool 3 has been sufficiently purified and the water quality has recovered to a predetermined level, the automatic switch button 31
When turned on, the first timer 50 that had been temporarily stopped starts operating again, the second site bunker pool valve 20 is fully opened, the first site bunker pool valve 18 is fully opened, and water is poured until the settling time T is reached. Circulate and purify.

Therefore, even if it becomes necessary to specifically purify only a certain pool as a result of the water quality test of each pool, manual operation and automatic operation can be used at the same time as appropriate, so that the water quality can be reliably maintained at a good level.

Note that the present invention is not limited to the embodiments described above.

For example, in the same embodiment, the first timer 50, the second timer 5
1. Although the adjustment times of the pit timers 52 are all set to T, they may be set to appropriate values depending on the volume of each pool.

Of course, various other modifications can be made without departing from the gist of the invention.

As explained above, according to the present invention, the site bunker can be operated automatically, so the burden on the operator can be reduced, and human errors can be eliminated, so that good water quality can always be maintained.

We can provide site bunker automatic operation control equipment.

[Brief explanation of drawings]

Figure 1 is a diagram showing an outline of an embodiment of the present invention, Figure 2a,
b is a layout diagram of buttons, etc. on the start/stop switch panel and selection switch panel of the same embodiment, FIG. 3 is a block diagram showing the configuration of the main parts of the same embodiment, and FIG. 4 is an automatic valve selection diagram of the same embodiment. FIG. 5 is a diagram showing the configuration of the timer device of the same embodiment, and FIG. 6 is a time chart showing the operation time relationship of the timer of the same embodiment. 1... Unloading pit, 2...
1st site bunker pool, 3...2nd site bunker pool, 11...skimmer surge tank, 13...circulation pump, 14...purifier, 15...Flow rate control valve, 16...
Unloading pit valve, 18...First site bunker pool valve, 20...Second site bunker boule dynamic operation device, 23...Start/stop switch, 2
4... Selection switch, 32... Skimmer surge tank water level detector, 33... System valve fully closed detector, 34... Circulation judgment circuit, 35・・・・・・
... Valve selection circuit, 36... Stop device, 3γ...
... Selection valve opening/closing device, 38... Hanging valve selection device, 39... Selection valve fully open detector, 40...
... Fully open judgment circuit, 41 ... Pump drive device,
42...Pump drive detector, 43...
Pump judgment circuit, 44...Flow rate control valve opening/closing device, 45...Delay circuit, 46...Flow rate control valve fully closed detector, 4γ...Stop Judgment circuit, 48
...Timer selection circuit, 49...Timer device, 50...First timer, 51...
Second timer, 52...Pit timer.

Claims (1)

[Scope of Claims] 1. An unloading pit for taking out reactor internals, spent fuel, etc., a plurality of site bunker pools for storing reactor structures, spent fuel, etc., and each of these pools and pits. means for adjusting the water filled in the tank to a predetermined level; a surge tank for storing the water adjusted and discharged by the means; and a pump for purifying the water stored in the tank and sending it back to the pit and each pool. , a circulation system consisting of a flow control valve purification device, a selection valve for selectively allowing purified water that has passed through this system to flow into the pit and each pool, and a control device for controlling the selection valve and the circulation system. , the above control device includes a circulation command switch that starts the device, a determination device that determines whether there is an abnormality in the water level of the pit or pool, the opening/closing status of each valve, etc. when this switch is turned on, and the determination result of this determination device. a command device that gives a start command to the pump, flow rate control valve, etc. in response to a command, a program device that sequentially opens and closes the selection valve for a predetermined period according to a predetermined program in accordance with the sending of the command from the command device; and a selection switch that temporarily stops the programming device and prioritizes the purification operation of the selected pit or pool when a button corresponding to one of the pools is selectively operated. Control device. 2 The programming device temporarily suspends the timed operation when a signal from the selection switch arrives during the period until the predetermined settling time is reached, and continues the remaining timed operation when the operation signal is issued again. 2. The site bunker automatic operation control device according to claim 1, wherein the site bunker automatic operation control device has a function of: