JPH0477279B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to equipment for treating radioactive waste liquid discharged from nuclear power generation equipment and the like.

[Technical background of the invention]

In general, radioactive waste liquid discharged from nuclear power generation facilities and the like is concentrated and reduced in volume by waste liquid concentration equipment, and then packed into storage containers such as drums, solidified with cement, etc., and stored. Conventionally, in order to store this concentrated radioactive waste liquid in a storage container, a certain amount of radioactive waste liquid is first stored in a waste liquid measuring tank, and this certain amount of radioactive waste liquid is transferred into a drum, and cement etc. was supplied and mixed with radioactive waste liquid to solidify it.

[Problems with background technology]

The radioactivity concentration of radioactive waste liquid is not necessarily constant.
Therefore, when the radioactive concentration of the radioactive waste liquid is high, the radioactivity level of the drum can filled with the radioactive waste liquid may become higher than the specified value. In such cases, the drums must be stored for a long period of time as highly radioactive waste, and the handling of the drums becomes extremely troublesome, as the radioactivity must be attenuated.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and its purpose is to automatically control the amount of radioactive waste liquid packed into storage containers such as drums according to the radioactivity concentration, and to reduce the radioactivity of the radioactive waste liquid. An object of the present invention is to provide a radioactive waste liquid treatment facility that can reduce the radioactivity level of a storage container filled with radioactive waste liquid to a predetermined value or less even when the concentration is high.

[Summary of the invention]

The present invention includes a waste liquid measuring tank for measuring radioactive waste liquid, a waste liquid supply means for introducing the radioactive waste liquid into the waste liquid measuring tank, and a method for detecting the amount of radioactive waste liquid introduced from the waste liquid supply means into the waste liquid measuring tank. A waste liquid amount detection means, a radiation detection means for detecting the radiation dose of the radioactive waste liquid introduced into the waste liquid measuring tank, and a waste liquid transfer means for transferring the radioactive waste liquid introduced into the waste liquid measuring tank to a storage container for solidification storage. and a diluent supply means for injecting a diluent into the storage container, and a control means for controlling the amount of radioactive waste liquid introduced into the waste liquid measuring tank and the amount of diluent injected into the storage container, The control means includes a filling amount setting device that sets a maximum filling amount of radioactive waste liquid stored in the storage container, and a waste liquid amount detection signal output from the waste liquid amount detection means and a filling amount setting device that sets the maximum filling amount of radioactive waste liquid stored in the storage container. a deviation calculation means for calculating a deviation from the amount setting signal; and a first device for outputting a waste liquid supply permission signal when the amount of waste liquid detected by the waste liquid amount detection means is smaller than the filling amount set by the filling amount setting device. Measures the amount of diluted liquid corresponding to the deviation value calculated by the deviation calculation means in response to the output signals from the deviation judgment device, the waste liquid amount detection means, the radiation detection means, the fill amount setting device, and the deviation calculation means. a diluted radioactivity concentration calculation means for calculating the diluted radioactivity concentration per unit volume of radioactive waste liquid when added to the tank; and a radioactivity concentration calculation means for calculating the permissible radioactivity concentration per unit volume of the radioactive waste liquid stored in the storage container. an activity concentration setting device; and a second device that outputs a waste liquid supply permission signal when the diluted radioactivity concentration calculated by the diluted radioactivity concentration calculation means is smaller than the allowable radioactivity concentration set by the radioactivity concentration setting device. a deviation judge, and when either the second deviation judge or the first deviation judge ceases to output a waste liquid supply permission signal, sends a waste liquid supply stop signal to the waste liquid supply means. waste liquid supply stop signal sending means, dilution liquid amount detection means for detecting the amount of dilution liquid injected into the storage container from the dilution liquid supply means, and the minimum value of the deviation signal output from the first deviation calculation means. a third storage means for storing a diluent supply stop signal to the diluent supply means when the diluent volume detected by the diluent volume detection means reaches the value stored in the storage means; and a deviation judger. Therefore, when the radioactive concentration of radioactive waste liquid is high, the amount of radioactive waste liquid supplied to the measuring tank is automatically reduced.
Since the amount of radioactive waste liquid packed into the storage container is reduced, the radioactivity level of the storage container filled with this radioactive waste liquid can be kept below a specified value.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a waste liquid measuring tank for measuring radioactive waste liquid. And this waste liquid measuring tank 1
A radioactive waste liquid is supplied therein from a waste liquid supply mechanism 2. This waste liquid supply mechanism 2 is composed of a pump 3 and a tank inlet valve 4, and the radioactive waste liquid concentrated by a waste liquid concentrator (not shown) is transferred by this pump 3 to the tank inlet valve 4. The waste liquid is supplied into the waste liquid measuring tank 1. Further, the radioactive waste liquid accumulated in the waste liquid measuring tank 1 is configured to be sent into a storage container such as a drum can 6 by a waste liquid transfer mechanism 5. This waste liquid transfer mechanism 5 is connected to the waste liquid measuring tank 1.
It consists of a transfer pipe 7 communicating with the bottom of the waste liquid measuring tank 1, and a tank outlet valve 8 provided in the middle of the transfer pipe 7.By opening the tank outlet valve 8, the radioactivity in the waste liquid measuring tank 1 is removed. The waste liquid is configured to be filled into the drum pipe 6 through the transfer pipe 7 by gravity. Further, a waste liquid amount detector 9 is provided in the waste liquid measuring tank 1 to detect the liquid level of the radioactive waste liquid in the waste liquid measuring tank 1 and to detect the amount of radioactive waste liquid stored in the waste liquid measuring tank 1. ing. Furthermore, a radiation detector 10 is provided in the waste liquid measuring tank 1 to detect the radiation dose of the radioactive waste liquid. Further, 11 is a diluent supply mechanism. This diluent supply mechanism 11 includes a diluent supply source 12 that supplies a diluent such as water, a diluent supply pipe 13 that supplies the diluent from this diluent supply source 12 into the drum can 6, and this diluent supply pipe. The diluent stop valve 14 and the diluent flow rate detector 15 are provided in the middle of the diluent 13. When the diluent stop valve 14 is opened, the diluent is supplied from the diluent supply source 12 into the drum can 6 via the diluent supply pipe 13, and the flow rate of the supplied diluent is It is configured to be detected by a liquid flow rate detector 15.

Signals from the waste liquid amount detector 9, radiation detector 10, and diluted liquid flow rate detector 15 are sent to a waste liquid metering control device 16, which controls the pump 3, tank inlet valve, etc. 4. The tank outlet valve 8 and diluent stop valve 14 are configured to be controlled.

The configuration of this waste liquid metering control device 16 will be explained below with reference to FIG. In the figure, reference numeral 17 denotes a waste liquid supply mechanism operating device, and the waste liquid supply mechanism operation command signal S ₁ is sent to the AND circuit 18 by operating this waste liquid supply mechanism operating device 17 . Further, the waste liquid amount signal S ₂ is sent from the waste liquid amount detector 9 to an addition/subtraction calculator 19 . Further, 20 is a filling amount setting device (hereinafter referred to as a filling amount setting device) for setting the filling amount of radioactive waste liquid to be filled into the drum 6, and this filling amount setting device 20 outputs a filling amount setting signal _S3. is sent to the addition/subtraction calculator 19. And this addition/subtraction calculator 1
At 9, the deviation between the waste liquid amount signal S ₂ and the filling amount setting signal S ₃ is determined, and a waste liquid amount deviation signal S ₄ is output. Then, this waste liquid amount deviation signal S ₄
is sent to the deviation judge 21, and this waste liquid amount deviation signal
It is configured to send a waste liquid supply permission signal S ₅ to the above-mentioned AND circuit 18 when S ₄ is positive, that is, when the amount of radioactive waste liquid in the waste liquid measuring tank 1 is smaller than the filling amount setting value. Further, 22 is a function generator, and this function generator 22 has the above-mentioned waste liquid amount detector 9.
, a waste liquid amount signal S ₂ from the addition/subtraction calculator 19, and _{an output signal S 6 from} the radiation detector 10 are input. Based on these signals, the function generator 22 calculates the radioactivity when the radioactive waste liquid currently stored in the waste liquid measuring tank 1 is diluted by mixing diluting liquid in an amount corresponding to the waste liquid amount deviation value. It is configured to calculate the concentration and send a corresponding diluted radioactivity concentration signal _S7 to the addition/subtraction calculator 23. Also,
Reference numeral 24 is a radioactivity concentration setting device, which outputs a radioactivity concentration setting signal _S8 corresponding to the allowable radioactivity concentration of the radioactive waste liquid packed into the drum 6 to the above-mentioned addition/subtraction calculator 23.
It is configured to send to. Then, the addition/subtraction calculator 23 calculates the deviation value between the diluted radioactivity concentration signal S ₇ and the radioactivity concentration setting signal S ₈ and sends the corresponding radioactivity concentration deviation signal S ₉ to the deviation judgment unit 24. It is configured as follows. This deviation judge 24
is the radioactivity concentration signal S ₉ sent from the addition/subtraction calculator 23
is positive, that is, when the diluted radioactivity concentration calculated by the function generator 22 is smaller than the radioactivity concentration setting value set by the radioactivity concentration setting device 24, the waste liquid supply permission signal _S10 is sent to the AND circuit 18. configured to send. This AND circuit 18 sends a waste liquid supply signal S 11 to the pump ₃ and tank inlet valve 4 of the waste liquid supply mechanism 2 when the waste liquid supply mechanism operation command signal S ₁ and waste liquid supply permission signals S _{5 and S 10 are} input. The pump 3 is operated, the tank inlet valve 4 is opened, and the radioactive waste liquid is supplied into the waste liquid measuring tank 1.

Further, the waste liquid amount deviation signal S ₄ outputted from the addition/subtraction calculator 19 is sent to the memory circuit 25, and this memory circuit 25 stores the minimum value of this waste liquid amount deviation signal S. S ₁₂ is configured to be sent to the addition/subtraction calculator 26 . Also, 2
Reference numeral 7 denotes a diluent integrator, which is configured to receive the diluent flow rate signal _S12 from the diluent flow rate detector 14. The diluent integrator 27 is configured to integrate the diluent flow rate signal S ₁₃ to determine the amount of supplied diluent, and send this diluent supply amount signal S ₁₄ to the addition/subtraction calculator 26. ing. Then, the addition/subtraction calculator 26 calculates the deviation between the waste liquid deviation minimum value signal S ₁₂ and the diluted liquid supply amount signal S ₁₄ , and sends this diluted liquid deviation signal S ₁₅ to the deviation judgment unit 2.
7. The deviation judge 27 outputs a dilution permission signal S ₁₆ when the dilution liquid deviation signal S ₁₅ is positive, that is, when the supply amount of the dilution liquid is smaller than the difference between the radioactive waste liquid in the waste liquid measuring tank 1 and the filling amount setting value. The signal is configured to be sent to the AND circuit 28. Further, reference numeral 29 is a dilution operating device, and is configured such that a dilution command signal S ₁₇ is sent to the AND circuit 28 by operating this dilution operating device 29. Then, this AND circuit 28 sends a valve opening signal S ₁₈ to the dilution liquid stop valve 14 when the above-mentioned dilution permission signal S ₁₆ and dilution command signal S ₁₇ are input, and opens this dilution liquid stop valve 14. It is configured to supply diluent into the drum 6. The memory circuit 25 and diluent integrator 27 are configured to be reset by a metering completion signal _S19 outputted from a metering completion operator 29.

Further, 30 is a waste liquid transfer operation device, and by operating this waste liquid transfer operation device 30, a valve opening signal _S20 is sent to the tank outlet valve 8 of the waste liquid transfer mechanism 5, and this tank outlet valve 8 is The valve is opened so that the radioactive waste liquid in the waste liquid measuring tank 1 is filled into the drum can 6.

Next, the operation of this embodiment will be explained. First, the waste liquid supply mechanism operation control device 17 is operated to send the waste liquid supply mechanism operation command signal S ₁ to the AND circuit 18 . In this case, if the inside of the waste liquid measuring tank 1 is empty, the level of the waste liquid amount signal S ₂ sent from the waste liquid amount detector 9 and the output signal S ₆ of the radiation detector 10 is low, so that the waste liquid from the addition/subtraction calculator 19 is The quantity deviation signal _S4 is positive, and therefore the deviation judgment device 21 outputs the AND circuit 1.
A waste liquid supply permission signal _S5 is sent to 8. Furthermore, since the level of the diluted radioactivity concentration signal S ₇ outputted from the function generator 22 is also low, the radioactivity concentration deviation signal S ₉ outputted from the addition/subtraction calculator 23 is positive, and therefore the deviation calculation unit 24 outputs the signal from the AND circuit. Waste liquid supply permission signal to 18
_S10 sent. Therefore, the waste liquid supply signal S ₁₁ is output from this AND circuit 18, the pump 3 of the waste liquid supply mechanism 2 is operated, and the tank inlet valve 4 is opened, and radioactive waste liquid is supplied into the waste liquid measuring tank 1. . As the level of the radioactive waste liquid in the waste liquid measuring tank 1 rises, the levels of the waste liquid amount signal _S2 and the radioactivity concentration signal _S6 rise. When the radioactivity concentration of the radioactive waste liquid is high, the diluted radioactivity concentration signal S ₇ output from the function generator 22 before the liquid level of the radioactive waste liquid in the waste liquid measuring tank 1 reaches the filling amount set value Radioactivity concentration setting device 24
It is equal to the radioactivity concentration signal _S8 output from
The radioactivity concentration deviation signal S ₉ output from the addition/subtraction calculator 23 becomes zero, and the waste liquid supply permission signal S ₁₀ from the deviation judge 24 is cut off. Yotsute AND circuit 18
The waste liquid supply signal _S11 from the tank is cut off, the pump 3 of the waste liquid supply mechanism 2 is stopped, and the tank inlet valve 4 is stopped.
The valve is closed and the supply of radioactive waste liquid is stopped. In this case, when the amount of radioactive waste liquid accumulated in the waste liquid measuring tank 1 is diluted with a diluent and the total amount is made equal to the set value of the amount to be filled into the drum can 6, its radioactive concentration becomes radioactive. This is the amount that is equal to the set value of the functional concentration. Further, in this case, the minimum value of the waste liquid amount deviation signal S ₄ output from the addition/subtraction calculator 19 is stored in the memory circuit 25 .

Next, the waste liquid transfer operation device 30 is operated, the tank outlet valve 8 is opened, and the radioactive waste liquid in the waste liquid measuring tank 1 is transferred into the drum can 6.

Next, operate the dilution operator 29, and the AND circuit 28
Send dilution command signal _S17 to. And in this case,
The minimum value of the waste liquid amount deviation signal S ₄ is stored in the memory circuit 25 , and the waste liquid amount deviation minimum value signal S ₁₂ is sent from this memory circuit 25 to the addition/subtraction calculator 26 . Further, a diluent supply amount signal S ₁₄ is sent to this addition/subtraction calculator 26 from a diluent integrator 27.
When no diluent is being sent into the drum 1, this diluent supply amount signal _S14 is zero. Therefore, the diluent deviation signal output from the addition/subtraction calculator 26
S ₁₅ is positive, and a dilution permission signal S ₁₆ is sent from the deviation judge 27 to the AND circuit 28 . Therefore, a valve opening signal _S18 is sent from this AND circuit 28 to the dilution liquid stop valve 14, and this dilution liquid stop valve 14 is opened.
A diluent is supplied into the drum 6. The flow rate of the diluent supplied into the drum can 6 is detected by a diluent flow rate detector 14, and a diluent flow rate signal is detected.
_S13 is sent to diluent integrator 27 and integrated.
The diluent integrator 27 sends the diluent supply signal S ₁₄ to the addition/subtraction calculator 26 . and,
When this diluted liquid supply amount signal S ₁₄ becomes equal to the waste liquid amount deviation minimum value signal S ₁₂ outputted from the memory circuit 25, the diluted liquid deviation signal S ₁₅ from the addition/subtraction calculator 26 becomes zero, and therefore the deviation judgment unit 27 The dilution permission signal _S16 sent to the AND circuit 28 is cut off,
The diluent stop valve 14 is opened and the supply of diluent to the drum 6 is stopped. Therefore, this drum 6 has a minimum waste liquid amount deviation value, that is, a filling amount setting device 2.
The diluent is supplied in an amount corresponding to the difference between the filling amount setting value set at 0 and the amount of radioactive waste liquid filled in the drum 6. Therefore, drum 6
The radioactive waste liquid in the drum 6 is diluted with this diluent, and its radioactivity concentration becomes the predetermined radioactivity concentration set by the radioactivity concentration setting device 24, and the total amount of the radioactive waste liquid and diluted liquid packed in the drum can 6. is the predetermined filling amount set by the filling amount setting device 20.

After measuring and diluting the radioactive waste liquid in this way, a predetermined amount of cement is poured into the drum 6, mixed with the radioactive waste liquid, and solidified.
Stored and processed.

Note that if the radioactivity concentration of the radioactive waste liquid is lower than the predetermined radioactivity concentration set by the radioactivity concentration setting device 24, the diluted radioactivity concentration signal _S7 output from the function generator 22 is used as the radioactivity concentration setting. The radioactivity concentration will never exceed a predetermined radioactivity concentration set in the device 24. In this case, when the radioactive waste liquid accumulates in the waste liquid measuring tank 1 to a predetermined filling amount set by the filling amount setting device 20, the waste liquid amount deviation signal S ₄ output from the adjustment calculator 19 becomes zero. Since the waste liquid supply permission signal _S5 sent from the deviation judger 21 to the AND circuit 18 is cut off, the supply of waste liquid is stopped. Also in this case, the waste liquid amount deviation minimum signal _S12 stored in the memory circuit 25 is zero, so no diluent is supplied into the drum 6 even if the dilution operator 29 is operated. Therefore, in this case, the radioactive waste liquid is sent into the drum 6 in a predetermined filling amount set by the filling amount setting device 20 without being diluted.

As described above, in this embodiment, if the radioactivity concentration of the radioactive waste liquid is high, the amount of filling will be small, so the drum can filled with this radioactive waste liquid will not have a radioactivity level higher than the specified level, and its handling will be extremely difficult. It becomes easier. In addition, in this embodiment, when the radioactive concentration of the radioactive waste liquid is high, it is diluted with a diluent to bring the radioactive concentration below a predetermined value, making it easier to handle when filling cement, etc. Since the amount of cement is always constant, the mixing ratio with cement is constant, making the work easier.

Note that the present invention is not limited to the above embodiment.

For example, when the radioactivity concentration is high, it is not necessarily necessary to dilute the radioactive waste with a diluent, and an extra amount of cement or the like may be filled to compensate for the small amount of radioactive waste.

Furthermore, the present invention is applicable not only to those that are solidified with cement, but also to those that are solidified with asphalt, synthetic resins, and the like.

Further, the configuration of the waste liquid metering control device is not necessarily limited to that of the first embodiment.

〔Effect of the invention〕

As described above, the present invention provides a waste liquid measuring tank for measuring radioactive waste liquid, a waste liquid supply means for introducing the radioactive waste liquid into the waste liquid measuring tank, and an amount of radioactive waste liquid introduced from the waste liquid supply means into the waste liquid measuring tank. a waste liquid amount detection means for detecting the radiation amount of the radioactive waste liquid introduced into the waste liquid measuring tank; a radiation detecting means for detecting the radiation amount of the radioactive waste liquid introduced into the waste liquid measuring tank; and a radiation detecting means for detecting the radiation amount of the radioactive waste liquid introduced into the waste liquid measuring tank; A waste liquid transfer means, a diluent supply means for injecting a diluent into the storage container, and a control means for controlling the amount of radioactive waste introduced into the waste liquid measuring tank and the amount of diluted liquid injected into the storage container. The control means includes a filling amount setting device for setting a maximum filling amount of radioactive waste liquid stored in the storage container, a waste liquid amount detection signal output from the waste liquid amount detection means, and an output from the filling amount setting device. deviation calculating means for calculating the deviation from the filling amount setting signal that has been set;
a first deviation determination device that outputs a waste liquid supply permission signal when the amount of waste liquid detected by the waste liquid amount detection means is smaller than the maximum filling amount of radioactive waste liquid set by the filling amount setting device; Radioactive waste liquid when an amount of diluent corresponding to the deviation value calculated by the deviation calculation means in response to the output signals from the detection means, radiation detection means, fill amount setting device, and deviation calculation means is added to the waste liquid measuring tank. a diluted radioactivity concentration calculation means for calculating a diluted radioactivity concentration per unit volume; a radioactivity concentration setting device for setting an allowable radioactivity concentration per unit volume of the radioactive waste liquid stored in the storage container; a second deviation determination device that outputs a waste liquid supply permission signal when the diluted radioactivity concentration calculated by the radioactivity concentration calculation means is smaller than the allowable radioactivity concentration set by the radioactivity concentration setting device; a waste liquid supply stop signal sending means for sending a waste liquid supply stop signal to the waste liquid supply means when either the deviation judger or the first deviation judge no longer outputs the waste liquid supply permission signal; diluent amount detection means for detecting the amount of diluent injected into the storage container from the diluent supply means;
storage means for storing the minimum value of the deviation signal outputted from the deviation calculation means; and a storage means for storing the minimum value of the deviation signal outputted from the deviation calculation means; and a third deviation judger for sending a diluent supply stop signal to the means.

Therefore, in the present invention, when either the waste amount or the radioactivity level of the radioactive waste introduced from the waste liquid supply means into the waste liquid measuring tank reaches a preset value, the waste liquid supply from the waste liquid supply means is stopped. However, since the radioactive waste liquid introduced into the waste liquid measuring tank is transferred to the storage container for solidification storage by the waste liquid transfer means, it is possible to store the radioactive waste liquid below a predetermined level in the storage container. In addition, if the amount of radioactive waste liquid stored in the storage container is less than the preset filling amount, an amount of diluted liquid corresponding to the difference between the amount of filling and the amount of waste liquid is injected into the storage container. It is possible to dilute the radioactive waste liquid with a high radioactivity level stored in the storage container with a diluent to bring it below the specified level, and it is also possible to keep the amount of fixing agent filled into the storage container together with the radioactive waste liquid constant. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a schematic configuration diagram and FIG. 2 being a schematic configuration diagram of a waste liquid metering control device. 1... Waste liquid measuring tank, 2... Waste liquid supply mechanism,
5... Waste liquid transfer mechanism, 6... Drum can (storage container), 9... Waste liquid amount detector, 10... Radiation detector, 11... Diluted liquid supply mechanism, 16... Waste liquid metering control device.

Claims (1)

[Claims] 1 A waste liquid measuring tank 1 for measuring radioactive waste liquid, a waste liquid supply means 2 for introducing radioactive waste liquid into this waste liquid measuring tank, and a waste liquid for detecting the amount of radioactive waste liquid introduced from this waste liquid supply means into the waste liquid measuring tank. a radiation detection means 10 for detecting the radiation dose of the radioactive waste liquid introduced into the waste liquid measuring tank; and a waste liquid transfer unit for transferring the radioactive waste liquid introduced into the waste liquid measuring tank to a storage container for solidification storage. means 5, diluent supply means 11 for injecting diluent into the storage container, and control means 16 for controlling the amount of radioactive waste introduced into the waste liquid measuring tank and the amount of diluent injected into the storage container. The control means includes a filling amount setting device 20 that sets the maximum filling amount of radioactive waste liquid stored in the storage container, and a waste liquid amount detection signal output from the waste liquid amount detection means and the filling amount setting device. a deviation calculation means 19 for calculating a deviation from a filling amount setting signal outputted from the filling amount setting signal; A first deviation determination device 21 that outputs a waste liquid supply permission signal, and a deviation value calculated by the deviation calculation means in response to output signals from the waste liquid amount detection means, the radiation detection means, the filling amount setting device, and the deviation calculation means. diluted radioactivity concentration calculation means 22 for calculating the diluted radioactivity concentration per unit volume of the radioactive waste liquid when an amount of diluted liquid corresponding to the amount of diluted liquid is added to the waste liquid measuring tank; and a unit of radioactive waste liquid stored in the storage container. A radioactivity concentration setter 24 that sets an allowable radioactivity concentration per volume, and a diluted radioactivity concentration calculated by the diluted radioactivity concentration calculation means are higher than the allowable radioactivity concentration set by the radioactivity concentration setter. When the second deviation judge 24 outputs a waste liquid supply permission signal when the difference is small, and either the second deviation judge or the first deviation judge ceases to output a waste liquid supply permission signal. a waste liquid supply stop signal sending means 18 for sending a waste liquid supply stop signal to the waste liquid supply means; a diluted liquid amount detection means 27 for detecting the amount of diluted liquid injected into the storage container from the diluted liquid supply means; A storage means 25 for storing the minimum value of the deviation signal outputted from the first deviation calculation means; A radioactive waste liquid processing equipment characterized by having a third deviation determination device 27 that sends a diluent supply stop signal to the diluent supply means.