JPH0631833B2 - Radioactive gas waste treatment equipment - Google Patents

Description

The present invention relates to a radioactive gas waste treatment device in a nuclear power plant, and relates to a hydrogen gas concentration in radioactive gas waste (hereinafter referred to as exhaust gas). The present invention relates to a radioactive gas waste treatment device capable of excellent monitoring.

(Prior Art) FIG. 4 shows the entire conventional radioactive gas waste treatment device of this type.

The configuration of this conventional radioactive gas waste treatment device will be described together with its operation.

In the nuclear power plant, the exhaust gas in the turbine condenser 11 attached to the turbine (not shown) is connected to the connecting pipe 1
It is taken out through 2 and then steam type air extractor 1
3, recombining device 14, activated carbon hold-up device 15 and extraction device 16 while being distributed,
It is discharged into the atmosphere through the exhaust stack 17. Explaining the process of each part, the exhaust gas extracted from the turbine condenser 11 by the steam air extractor 13 is detonated by the driving steam supplied through the steam supply line 18 in the steam air extractor 13. It is diluted to less than 4 vol% of the outside. The exhaust gas flowing out of the steam type air extractor 13 is supplied to the connecting pipe 12 through the air supply line 19 when the hydrogen gas concentration contained in the exhaust gas exceeds the set value such as 4 vol% mentioned above. Is diluted with air. The air supply amount of this air supply line 19 is
It is performed by an air flow rate control valve 21 which is controlled to be opened and closed by a manually adjusted opening degree controller 20. After that, the exhaust gas flows into the recombiner 14, and the hydrogen gas (H ₂ ) and the oxygen gas (O ₂ ) generated by the radiolysis of the reactor water contained in the exhaust gas are recombined, and the water vapor is condensed and removed. It The pressure, temperature and flow rate of the exhaust gas flowing through the inside of the recombining device 14 are the same as those of the connecting pipe 12 on the upstream side of the recombining device 14.
Are measured by the system pressure detector 22, the system temperature detector 23, and the system flow rate detector 24, respectively. The exhaust gas, which has been subjected to the recombination process in this way and is made to have only an air content, further flows into the activated carbon holdup device 15, and the radioactive noble gas contained in the exhaust gas is adsorbed by the activated carbon and attenuated. The pressure, temperature and flow rate of the exhaust gas flowing through the activated carbon holdup device 15 are the system pressure detector 25, the system temperature detector 26 and the system flow rate detector provided in the communication pipe 12 on the downstream side of the activated carbon holdup device 15. 27, respectively. The exhaust gas from which the harmful components have been removed in this way is discharged into the atmosphere through the exhaust stack 17 by the transportation force of the extraction device 16.

Further, in order to effectively remove harmful components contained in the exhaust gas, a hydrogen gas analyzer 28 is provided for monitoring the concentration of hydrogen gas in the exhaust gas in the system flowing through the communication pipe 12. This hydrogen gas analyzer 28 is a recombination device 14
In the upstream region of the, the first sampling line 29a is branched from the connecting pipe 12 to check the vapor dilution, the exhaust gas is continuously divided and sampled, and the hydrogen gas concentration in the exhaust gas is measured by the first hydrogen gas analyzer 30a. Is being measured and monitored. Further, in the downstream region of the recombining device 14, the hydrogen gas analyzer 28 branches the second sampling line 29b from the connecting pipe 12 in the same manner as described above in order to confirm the recombinability of hydrogen gas and oxygen gas. Exhaust gas is continuously split and sampled, and the second hydrogen gas analyzer 3
0b measures and monitors the hydrogen gas concentration in the exhaust gas. To explain further, one of the first sampling lines 29a is branched from the downstream side of the connection point of the air supply line 19 to the connecting pipe 12 and the upstream side of the recombining device 14, and the first sampling line 29a.
The sampling exhaust gas that has been split into the inside is the first inlet valve 31.
It flows into the dehumidifier 32 via a and the vapor component is condensed and removed. The vapor component removed by the dehumidifier 32 is temporarily stored in the drain pot 33, and the amount of condensation thereof is measured by the drain water level gauge 34. When the water level in the drain pot 33 reaches a certain level, the drain valve 3
5 is opened and drain pot 3 is passed through drain line 36.
The drain in 3 is returned to the turbine condenser 11. The exhaust gas from which the vapor component has been removed in the dehumidifier 32 is fed toward the mixer 38 provided on the upstream side of the first hydrogen gas analyzer 30a by the transport force of the first sample pump 37a. On the upstream side of the mixer 38, the nitrogen gas for diluting the exhaust gas is in the middle of the nitrogen gas flow rate control valve 3
9 and a nitrogen gas supply line 41 having a nitrogen gas supply valve 40 is injected into the first sampling line 29a. The supply amount of nitrogen gas required for dilution is set in advance by adjusting the opening degree of the nitrogen gas flow rate control valve 39, and the supply amount is measured by the nitrogen gas flow rate detector 42. Then, the exhaust gas flowing into the mixer 38 together with the nitrogen gas injected from the nitrogen gas supply line 41 is uniformly mixed in the mixer 38, and then discharged to the downstream side. The exhaust gas flowing out of this mixer 38 is
The pressure, temperature and flow rate are measured by the first sample pressure detector 4
3, measured by the first sample temperature detector 44a and the first sample flow rate detector 45a, respectively.
The hydrogen gas concentration is measured by the first hydrogen gas detector 46a of the hydrogen gas analyzer 30a, and then the first outlet valve 47a.
Via the reflux line 48 via the steam type air extractor 1
3 is returned to the connecting pipe 12 on the upstream side. The hydrogen gas concentration in the non-condensable exhaust gas detected by the first hydrogen gas detector 46a is the first hydrogen gas concentration detection signal 49a.
Is sent to the first hydrogen gas concentration calculating computer 50a. Then, the calculator 50a for calculating the first hydrogen gas concentration
Is for calculating the degree of vapor dilution by the vapor type air extractor 13, that is, the hydrogen gas concentration in the exhaust gas at the inlet of the recombining device 14, and the first hydrogen gas sent from the first hydrogen gas detector 46a. Based on the concentration detection signal 49a, the drain water level detector output signal 51 sent from the drain water level gauge 34 and the first sample flow rate detector output signal 52a sent from the first sample flow rate detector 45a, According to (1), the hydrogen gas concentration at the inlet of the recombination device Calculate and obtain.

here, Is.

The hydrogen gas concentration calculated by the first hydrogen gas concentration calculating computer 50a is recorded by the first hydrogen gas concentration meter 53a. Then, when the calculated hydrogen gas concentration becomes higher than the set value, the first alarm device 54a issues an alarm.

The hydrogen gas concentration of the exhaust gas flowing downstream of the recombiner 14 is monitored by the second hydrogen gas analyzer 30b provided in the second sampling line 29b branched from the communication pipe 12. In this case, since the exhaust gas on the downstream side of the recombining device 14 does not contain water vapor, the first sampling line 2 on the upstream side of the recombining device 14 described above is not included.
It is not necessary to remove the water vapor content by the dehumidifier 32 provided in 9a and dilute the hydrogen gas with the nitrogen gas injected through the nitrogen gas supply line 41 in the mixer 38.
Therefore, the exhaust gas for sampling that has been split into the second sampling line 29b passes through the second inlet valve 31b,
The second sample pump 37b supplies the second sample pressure detector 43b, the second sample temperature detector 44b, and the second sample flow rate detector 4 by supplying the second sample pump 37b to the downstream side.
The pressure, temperature and flow rate are measured by 5b. Further, the exhaust gas is the second hydrogen gas analyzer 30.
The hydrogen gas concentration is detected by the second hydrogen gas detector 46b of b, and then the second outlet valve 47b and the reflux line 4 are detected.
8 through the connecting pipe 1 upstream of the steam type air extractor 13.
Brought to reflux. Then, the second hydrogen gas analyzer 30
In b, the hydrogen gas concentration based on the second hydrogen gas concentration detection signal 49b emitted from the second hydrogen gas detector 46b is recorded in the second hydrogen gas concentration meter 53b. When the measured hydrogen gas concentration value exceeds the set value, the second alarm device 54b gives an alarm.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional apparatus, the accuracy of detecting the hydrogen gas concentration of the exhaust gas containing steam on the upstream side of the recombiner 14 includes an unstable factor. This is because the hydrogen gas concentration measurement is performed by the first hydrogen gas concentration calculation computer 50a.
There was an unstable factor in the measurement of the conditions for quantitatively calculating and obtaining in. For example, the first sampling line 2
As the amount of water vapor in the sampling exhaust gas diverted through 9a, the water vapor condensed by the dehumidifier 32 is temporarily stored in the drain pot 33, and the stored water content in the drain pot 33 is measured by the drain water level meter 34. The drain water level detector output signal 51, which is the detected value, was adopted. However, this amount of water vapor varies depending on the pressure and temperature of the exhaust gas, and the accurate amount of water vapor cannot be grasped only by the drain water level detector output signal 51 described above. Therefore, the accuracy is deteriorated in the quantitative evaluation of the hydrogen gas concentration.

Further, since the setting of the nitrogen gas injection amount performed through the nitrogen gas supply line 41 is a manual setting, it was necessary to accurately measure the hydrogen gas concentration in order to improve the accuracy of the injection amount.

The present invention has been made in consideration of such points,
The accuracy of the measurement of hydrogen gas concentration in exhaust gas is improved by using the information obtained by conventional measurement equipment without installing a new measurement device, and its reliability is also improved. Based on the above, it is an object of the present invention to provide a radioactive gas waste treatment device which can be operated and controlled so that the hydrogen gas concentration in exhaust gas is maintained at an appropriate value.

[Structure of Invention]

(Means for Solving Problems) A radioactive gas waste treatment device of the present invention is a steam-type air extractor for extracting radioactive gas waste from a turbine condenser,
A recombining device for recombining hydrogen gas and oxygen gas in the radioactive gas waste extracted by the steam type air extractor, and an activated carbon hold for absorbing and attenuating the radioactive noble gas sent from the recombining device. Up device and an extraction device for exhausting the radioactive gas waste treated by this activated carbon holdup device to the outside air in order through a communication pipe, and for dilution to the communication pipe downstream of the steam type air extractor The dilution effect of hydrogen gas in radioactive gas waste is monitored on the first sampling line that connects the air supply line that supplies air and branches from the connecting pipe between the connection point of this air supply line and the recombiner. A first hydrogen analyzer is installed, and a second sampling line branched from a connecting pipe between the recombining device and the activated carbon holdup device is connected with the hydrogen gas and the oxygen gas. A second hydrogen analyzer for monitoring the effect of the binding treatment is provided, and the radioactive gas waste on the system side which flows through the recombining device and the activated carbon holdup device, respectively, and the radioactivity on the sample side supplied to the first hydrogen analyzer. What is claimed is: 1. A radioactive gas waste treatment apparatus comprising a temperature detector for measuring the temperature, pressure and flow rate of a gas waste, a pressure detector and a flow rate detector respectively, wherein the flow rate is corrected to A correction calculator for pressure correction is provided, and the corrected flow signal of radioactive waste gas sent from each correction calculator and the hydrogen gas detector of the first hydrogen analyzer are sent. It is characterized in that a first hydrogen gas concentration calculating computer for calculating the hydrogen gas concentration based on a signal representing the detected hydrogen gas concentration is provided.

(Operation) In the present invention, the flow rate detector, the pressure detector, and the temperature detector provided in the conventional apparatus are used as they are, and the flow rate of the exhaust gas detected by the flow rate detector is detected by the correction computing unit. Corrected based on the pressure and temperature measured by the detector and temperature detector, the accurate exhaust gas flow rate is obtained. The accurate exhaust gas flow rate thus obtained is used as a calculation condition for calculating the hydrogen concentration in the exhaust gas. That is, in the hydrogen gas analyzer for analyzing the hydrogen gas concentration contained in the exhaust gas due to the driving steam of the steam type air extractor, the first hydrogen gas concentration detection signal detected by the hydrogen gas detector and the above-mentioned calculation conditions. The hydrogen concentration in the exhaust gas is accurately calculated according to a predetermined arithmetic expression by the first hydrogen gas concentration calculation arithmetic unit with the flow rate of the exhaust gas as a variable.

In the present invention, further, the air supply for dilution to the system side can be controlled depending on whether or not the magnitude of the hydrogen gas concentration calculated as described above reaches the set value, and the hydrogen gas concentration can be controlled. Since the measurement accuracy is high, effective and appropriate air supply can be performed, and highly reliable and safe operation control can be performed.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a system diagram showing an embodiment of the present invention. In the figure, the same parts as those in the conventional example are designated by the same reference numerals.

In this embodiment, the hydrogen gas concentration is accurately measured by using various measuring instruments that have been conventionally provided. Therefore, in this embodiment, a hydrogen gas analyzer 28a is provided in which the configuration of the first hydrogen gas analyzer 30c for measuring the hydrogen gas concentration of the exhaust gas on the upstream side of the recombination device 14 is changed from the conventional example.

To explain further, the first hydrogen gas concentration calculating computer 5 for calculating the hydrogen gas concentration in the first hydrogen gas analyzer 30c.
0c is more appropriate than the conventional one, and various calculation conditions are given. That is, the conventional first
The calculation condition given to the calculator 50a for calculating the hydrogen gas concentration is the first condition issued from the first hydrogen gas detector 46a.
The hydrogen gas concentration detection signal 49a, the first sample flow rate detector output signal 52a emitted from the first sample flow rate detector 45a, and the drain water level detector output signal 51 emitted from the drain water level gauge 34 were used. On the other hand, in the first hydrogen gas concentration calculating computer 50c of the present embodiment,
The first hydrogen gas concentration detection signal 49a is input as it is, but the first sample flow rate detector output signal 52a and the drain water level detector output signal 51 are once input to the sample flow rate correction calculator 55, and the sample flow rate is detected. Correction calculator 5
After being subjected to a correction process which will be described later by 5, it is input to the first hydrogen gas concentration calculating computer 50c as a sample flow rate correcting computer output signal 56. Further, in the present embodiment, the exhaust gas flow rate on the system side is further attached to the system flow rate detector 24 on the upstream side of the recombining device 14 and the system flow rate detector 27 on the downstream side of the activated carbon holdup device 15, respectively. The flow rate correction calculators 57 and 58 output the system side flow rate correction calculator output signals 59 and 60, which are input as calculation conditions to the first hydrogen gas concentration calculation calculator 50c.

In the present embodiment, the sample flow rate correction calculator output signal 56 and the system side flow rate correction calculator output signals 59 and 60, which are input to the first hydrogen gas concentration calculation calculator 50c, are simply the first sample. Flow rate detector 45a,
Not the exhaust gas flow rate measured by the system flow rate detectors 24 and 27, but the sample flow rate correction calculator 5
5, the values corrected by the system side flow rate correction computing devices 57 and 58. That is, since the indicated value of the flow rate of exhaust gas varies depending on the pressure and temperature conditions at the time of measurement, it is necessary to perform pressure correction and temperature correction. Therefore, in the present embodiment, the system flow rate detectors 24 and 2
In part 7, the pressure and temperature of exhaust gas in the system, that is, the temperature / pressure detection by the system pressure detectors 22 and 25 and the system temperature detectors 23 and 26 in the system side flow rate correction computing devices 57 and 58, respectively. Based on the detector output signals 66 and 67, the measured exhaust gas flow rate of the system flow detectors 24 and 27, that is, the flow detector output signal 6
8 and 69 are corrected, and the computer side output signal 5 for flow rate side correction
It outputs as 9 and 60. Further, in the sample flow rate correction computing unit 55 attached to the first sample flow rate detector 45a, the first sample pressure detector 43a and the first sample temperature detector 44a measure the first sample flow rate.
The measured exhaust gas flow rate of the first sample flow rate detector 45a, that is, the second sample flow rate detector output signal 52a is corrected based on the pressure and temperature of the exhaust gas in the sampling line 29a, that is, the sample temperature / pressure detector output signal 70, and further, Drain water level detector output signal 51 emitted from the drain water level gauge 34 and the nitrogen gas flow rate detector 4
The nitrogen gas flow rate detector output signal 61 emitted from the sample No. 2 is also corrected, and the sample flow rate correction calculator output signal 5
It is output as 6. Then, the first hydrogen gas concentration calculating computer 50c of the present embodiment has these first hydrogen gas concentration detecting signal 49a and sample flow rate correcting computer output signal 5
6, the system side flow rate correction output signals 59 and 60 are used as variables, and the hydrogen gas concentration at the inlet of the recombiner is calculated based on the following equation (2). Is calculated.

here, Is.

The hydrogen gas concentration calculated by the above equation (2) is more accurate than the hydrogen gas concentration calculated by the conventional device, because each calculation condition is corrected to a proper value.

The hydrogen gas concentration calculated by the first hydrogen gas concentration calculating computer 50c is recorded in the first hydrogen gas concentration meter 53a.

Further, in this embodiment, the air supply amount by the air supply line 19 is further adjusted based on the measured hydrogen gas concentration. That is, an air supply valve 62 is provided on the downstream side of the air flow rate control valve 21 provided in the middle of the air supply line 19, and the air supply valve 62 is used as the first hydrogen gas concentration meter 53a and the second hydrogen gas concentration meter 53.
When the output signal 63 of the hydrogen gas concentration meter indicating the hydrogen gas concentration emitted from b exceeds the set value, the operation is performed so as to be fully closed to fully open. In the present embodiment, the set value is
When the hydrogen gas concentration in the exhaust gas becomes 4 vol% or more and an alarm is issued from the first alarm devices 54a and 54b,
At the same time, it is set to a value for switching the air supply valve 62 to full open. The amount of air supplied from the air supply line 19 when the air supply valve 62 is fully opened is adjusted by opening / closing the air flow rate control valve 21 on the upstream side of the air supply valve 62. In the present embodiment, the system side flow rate correction calculator output signal 5 is sent to the air flow rate control valve 21.
The FCV automatic controller output signal 65 of a size that determines the valve opening of the air flow control valve 21 according to the size of the system side flow rate correction calculator output signal 60 that is the output of
The opening and closing of the air flow rate control valve 21 is controlled by the emission from the automatic adjuster 64.

The other structure is similar to that of the conventional device shown in FIG.

Next, the operation of the present embodiment will be described particularly with respect to the measurement of the hydrogen gas concentration in the exhaust gas and the operation control according to the measurement result, and the other operations will be briefly described because they are similar to those of the conventional example.

In the present embodiment, the exhaust gas along the connecting pipe 12 is subjected to the above-mentioned respective treatments by the respective devices 13, 14, 15, 16 on the system side, and is branched from the system side by the respective sampling lines 29a, 29b. From the exhaust gas, the hydrogen gas concentration is measured by the first hydrogen gas analyzer 30c and the second hydrogen gas analyzer 30b, respectively. In this case, in this embodiment, the flow rate of the exhaust gas passing through the recombiner 14 is detected by the system flow rate detector 24 provided on the upstream side of the recombiner 14, and the detected flow rate, that is, flow rate detection. Output signal 6
8 is a temperature / pressure detector output signal 6 composed of pressure and temperature detected by the system pressure detector 22 and the system temperature detector 23 in the system side flow rate correction computing unit 57.
6, the first hydrogen gas concentration calculating computer 5 is corrected as a system side flow rate correcting computer output signal 59 of an appropriate value.
It is output toward 0c. The flow rate of the exhaust gas passing through the activated carbon holdup device 15 is the system flow rate detector 2 provided on the downstream side of the activated carbon holdup device 15.
7 and the detected flow rate, that is, the flow rate detector output signal 69, is detected from the pressure and temperature detected by the system pressure detector 25 and the system temperature detector 26 in the system side flow rate correction calculator 58. Which is corrected based on the temperature / pressure detector output signal 67
It is output to the calculator 50c for calculating the hydrogen gas concentration and the FCV automatic regulator 64. Further, the flow rate of the sample exhaust gas flowing on the downstream side of the mixer 38 of the first sampling line 29a is detected by the first sample flow rate detector 45a, and the detected flow rate, that is, the first sample flow rate detector output signal. 52a is corrected in the sample flow rate correction calculator 55 based on the sample temperature / pressure detector output signal 70 composed of the pressure and temperature detected by the first sample pressure detector 43a and the first sample temperature detector 44a, The value is output to the first hydrogen gas concentration calculating computer 50c as a sample flow rate correcting computer output signal 56. Also, drain water level gauge 3
Similarly, the drain water level detector output signal 51 issued from No. 4 and the nitrogen gas flow rate detector output signal 61 issued from the nitrogen gas flow rate detector 42 are similarly sampled by the sample flow rate correction calculator 55. 70
Is output to the first hydrogen gas concentration calculating computer 50c as a sample flow rate correcting computer output signal 56 having an appropriate value. In the first hydrogen gas concentration calculating computer 50c, the input first hydrogen gas concentration detecting signal 49a, sample flow rate correcting computer output signal 56, and system side flow rate correcting computer output signals 59 and 60 are input. Is used as a calculation condition, and calculation is performed based on the equation (2) to calculate an accurate hydrogen gas concentration. The hydrogen gas concentration calculated in this way is measured by the first hydrogen gas concentration meter 5
It is recorded in 3a.

Further, in the present embodiment, the first hydrogen gas concentration calculating computer 50c and the second hydrogen gas concentration calculating computer 50b.
When both the hydrogen gas concentrations calculated by the above are both suppressed to a low value that does not reach the set value, no alarm is given, and the air supply valve 62 is fully closed. The supply of dilution air into it is stopped. From this state, if at least one of the hydrogen gas concentrations calculated by the first hydrogen gas concentration calculation computer 50c and the second hydrogen gas concentration calculation computer 50b becomes equal to or greater than the set value, the hydrogen gas concentration abnormality occurs. It is judged to be high, alarms are issued from the corresponding first alarm device 54a and second alarm device 54b, and the air supply valve 62 that has received the hydrogen gas concentration meter output signal 63 which means valve opening is fully closed to fully open. Switch to. The air flow control valve 21 sends the FCV automatic regulator output signal 6 sent from the FCV automatic regulator 64.
5 is controlled to open and close in accordance with No. 5, and an appropriate amount of diluting air is supplied from the air supply line 19 into the communication pipe 12 on the system side, and reduction of the hydrogen gas concentration in the exhaust gas flowing in the communication pipe 12 is started. To be done. After that, when the hydrogen gas concentration in the exhaust gas being sampled becomes equal to or lower than the set value, a hydrogen gas concentration meter output signal 63 indicating valve closing is sent to the air supply valve 62, and the air supply valve 62 is fully opened. It is switched to the closed state, and the air supply to the connecting pipe 12 is stopped.

As described above, in this embodiment, the hydrogen gas concentration in the exhaust gas can be accurately measured, and the operation can be controlled so that the hydrogen gas concentration is maintained within the set range according to the hydrogen gas concentration.

FIG. 2 shows another embodiment of the present invention, showing an example in which, when measuring the flow rate of the exhaust gas passing through the activated carbon holdup device 15, the conditions on the inlet side of the activated carbon holdup device 15 are emphasized. , Activated carbon hold-up device 15
1, the system pressure detector 25, the system temperature detector 26, the system flow rate detector 27, the system side flow rate correction calculator 58, and the FCV automatic controller 64, which are similar to those in FIG. 1, are provided. The flow rate of the exhaust gas in the activated carbon holdup device 15 according to this embodiment is measured in the same manner as in the above embodiment,
Other actions are similarly performed.

FIG. 3 shows still another embodiment of the present invention, in which the FCV automatic regulator 64 in the embodiment of FIG. 1 is omitted and the air flow control valve 21 is controlled to be manually opened / closed by using the opening regulator 20. It was formed in. In the present embodiment, when the hydrogen gas concentration exceeds the set value and the air supply valve 62 is fully opened, the valve opening degree of the air flow control valve 21 is adjusted while monitoring the hydrogen gas concentration. , The amount of air supplied from the air supply line 19 into the communication pipe 12 on the system side is controlled.

In each of the above embodiments, each of the computing units 50c, 5
Although 5, 57 and 58 are provided independently, they may be integrated into a single arithmetic unit.

〔The invention's effect〕

As described above, according to the present invention, the accuracy of the measurement of the hydrogen gas concentration in the exhaust gas is improved by using the information obtained by the conventional measuring instrument without providing a new measuring instrument, and the reliability thereof is improved. Can be improved. Further, the operation can be controlled so that the hydrogen gas concentration in the exhaust gas can be maintained at an appropriate value based on the measured hydrogen gas concentration, and safer system operation can be performed.

[Brief description of drawings]

FIG. 1 to FIG. 3 are system diagrams of the overall configuration showing an embodiment of the radioactive gas waste treatment device of the present invention, and FIG. 4 is a system diagram showing the overall configuration of a conventional device. 11 ... Turbine condenser, 12 ... Communication pipe, 13 ... Steam type air extractor, 14 ... Recombiner, 15 ... Activated carbon halt up device, 16 ... Extractor, 17 ... Exhaust stack, 19 ... Air supply line, 20 ... Opening degree controller, 2
1 ... Air flow control valve, 22 ... System pressure detector, 23
...... System temperature detector, 24 ...... System flow detector, 25 ...
… System pressure detector, 26 …… System temperature detector, 27 ……
System flow rate detector, 29a ... 1st sampling line,
29b ... second sampling line, 30a, 30c ...
... first hydrogen gas analyzer, 30b ... second hydrogen gas analyzer, 39 ... nitrogen gas flow control valve, 41 ... nitrogen gas supply line, 43a ... first sample pressure detector, 43b
...... Second sample pressure detector, 44a ...... First sample temperature detector, 44b ...... Second sample temperature detector, 45
a ... 1st sample flow rate detector, 45b ... 2nd sample flow rate detector, 46a ... 1st hydrogen gas detector, 46b
...... Second hydrogen gas detector, 49a ...... First hydrogen gas concentration detection signal, 49b ...... Second hydrogen gas concentration detection signal, 50
a, 50c ... A computer for calculating the first hydrogen gas concentration, 53a
...... First hydrogen gas densitometer, 53b …… Second hydrogen gas densitometer, 55 …… Calculator for sample flow rate correction, 57,58
... System side flow rate correction calculator, 62 ... Air supply valve, 63
...... Hydrogen gas concentration meter output signal, 64 …… FCV automatic regulator, 65 …… FCV automatic regulator output signal.

Claims (3)

[Claims] 1. A steam type air extractor for extracting radioactive gas waste from a turbine condenser, and recombining hydrogen gas and oxygen gas in the radioactive gas waste extracted by the steam type air extractor. A recombining device, an activated carbon holdup device for adsorbing and attenuating the radioactive noble gas sent from the recombining device, and an extraction device for exhausting the radioactive gas waste processed by the activated carbon holdup device to the outside air. Connected in sequence via a connecting pipe, connecting an air supply line for supplying dilution air to the connecting pipe on the downstream side of the steam type air extractor, and connecting the connection point of this air supply line and the recombining device. The first sampling line branched from the connecting pipe is provided with a first hydrogen analyzer for monitoring the dilution effect of hydrogen gas in the radioactive gas waste, and the recombination device and activated carbon hold-up. Second branching from communication pipe between the location
A second hydrogen analyzer for monitoring the recombination treatment effect of hydrogen gas and oxygen gas is provided in the sampling line, and the radioactive gas waste on the system side which flows through the recombination device and the activated carbon holdup device, respectively, and the first hydrogen analyzer. In a radioactive gas waste treatment device comprising a temperature detector for measuring the temperature, pressure and flow rate of the sample-side radioactive gas waste to be supplied to the hydrogen analyzer, a radioactive gas waste treatment apparatus provided with a pressure detector and a flow rate detector, respectively. Each of the flow rate detectors is equipped with a correction calculator for temperature correction and pressure correction.
Based on the corrected flow signal of radioactive gaseous waste sent from each of the correction computing units and the signal representing the detected hydrogen gas concentration sent from the hydrogen gas detector of the first hydrogen analyzer. The first to calculate the hydrogen gas concentration
A radioactive gas waste treatment device comprising a calculator for calculating hydrogen gas concentration. 2. The air supply line is provided with an air supply valve for selecting isolation or opening of the communication pipe of the air supply line based on the hydrogen gas concentration obtained by the hydrogen gas analyzer, and a correction arithmetic unit. The air flow rate control valve for adjusting the amount of air supplied from the air supply line based on the flow rate of the radioactive gas waste on the system side, and the air flow control valve according to claim 1. Radioactive gas waste treatment equipment. 3. The air supply valve and the air flow rate control valve adjust the concentration of hydrogen gas in the radioactive waste in the system to 4 vol.
The radioactive gas waste treatment device according to claim 2, wherein the opening degree is adjusted so as to be maintained at not more than%.