CN117976278A - Method and device for heating and tritium removal of filter element of movable heavy water reactor waste filter - Google Patents
Method and device for heating and tritium removal of filter element of movable heavy water reactor waste filter Download PDFInfo
- Publication number
- CN117976278A CN117976278A CN202311801327.4A CN202311801327A CN117976278A CN 117976278 A CN117976278 A CN 117976278A CN 202311801327 A CN202311801327 A CN 202311801327A CN 117976278 A CN117976278 A CN 117976278A
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- Prior art keywords
- heating
- tritium
- chamber
- waste filter
- filter element
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Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 151
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 title claims abstract description 111
- 229910052722 tritium Inorganic materials 0.000 title claims abstract description 111
- 239000002699 waste material Substances 0.000 title claims abstract description 83
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000002808 molecular sieve Substances 0.000 claims abstract description 58
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000010521 absorption reaction Methods 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 238000005303 weighing Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 25
- 239000011261 inert gas Substances 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 5
- 238000001179 sorption measurement Methods 0.000 abstract description 9
- 238000000746 purification Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Measurement Of Radiation (AREA)
Abstract
The invention relates to a heating tritium removal method for a movable heavy water reactor waste filter element, which comprises the following steps: opening a top cover of a waste filter element disposal pit to be treated, weighing the waste filter element, placing the waste filter element into a heating chamber, and closing the heating chamber; determining the dosage of the molecular sieve, and filling the molecular sieve into a tritium water absorption chamber and communicating the molecular sieve with a heating chamber; performing tightness detection; heating the heating chamber and maintaining the temperature in the heating chamber at a predetermined temperature; the weights of the heating chamber, the tritium water absorption indoor waste filter element and the molecular sieve are respectively recorded, and heating is stopped when the weights are unchanged; the invention also comprises a device for heating and removing tritium by the movable heavy water stack waste filter element, and the method and the device for heating and removing tritium by the movable heavy water stack waste filter element can realize efficient heating and removing of tritium adsorption by the waste filter element and adsorption purification of tritium.
Description
Technical Field
The invention belongs to the technical field of waste filter element treatment in a heavy water pile treatment pit, and particularly relates to a method and a device for heating and removing tritium from a movable heavy water pile waste filter element.
Background
Heavy water reactor nuclear power plants such as, for example, a 2-station 700MWe grade CANDU-6 pressurized heavy water reactor. 7 systems of each unit are provided with water filters, the water filters are important equipment in the nuclear island radioactive water treatment system, and impurities such as suspended matters are filtered in a water using process of a primary loop of a reactor and related systems, so that the stable operation of the units and related systems is ensured; in the drainage process of a loop sewage disposal system, a waste liquid treatment system and the like, the radioactivity and the chemical component content of the waste liquid are reduced, and the waste liquid discharge is ensured to meet the local environmental protection policy.
The filter element needs to be replaced at regular intervals or when the pressure difference reaches a set value, and according to the specification of a power station, the waste filter element (hereinafter referred to as a waste filter element) needs to be loaded into a shielding container to be transported to a waste temporary storage warehouse for temporary storage when the contact dosage rate of the waste filter element is more than 2 mSv/h. The temporary storage mode is that the waste filter element is vertically placed in a temporary storage warehouse underground disposal pit, and the upper part of the disposal pit is covered with a top cover to realize the sealing temporary storage of the waste filter element.
Because the temporary stored waste filter element in the temporary storage warehouse has higher dosage rate and contains a large amount of tritium water, personnel cannot directly contact and treat the waste filter element in a close range, and any waste filter element treatment method needs to open a treatment pit top cover to remove the waste filter element from the treatment pit, so that the tritium water is likely to overflow and cause radiation hazard to the environment and personnel.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a heating tritium removal method and device for a movable heavy water reactor waste filter element so as to realize the safe treatment of the waste filter element in a disposal pit.
In order to achieve the above purpose, the invention adopts the technical scheme that: a heating tritium removal method for a movable heavy water pile waste filter element comprises the following steps: opening a top cover of a waste filter element disposal pit to be treated, weighing the waste filter element, placing the waste filter element into a heating chamber, and closing the heating chamber; determining the dosage of the molecular sieve, and filling the molecular sieve into a tritium water absorption chamber and communicating the molecular sieve with a heating chamber; performing tightness detection; after the leak detection gas in the heating chamber is exhausted, the heating chamber is heated, and the temperature in the heating chamber is maintained at a preset temperature; during the heating period, the weights of the heating chamber, the tritium water absorption indoor waste filter element and the molecular sieve are respectively recorded, and the heating is stopped when the weights are unchanged; and after stopping heating, repeatedly filling inert gas into the heating chamber to send residual tritium water or tritium water gas in the heating chamber into a tritium water absorption chamber for complete absorption.
Further, the molecular sieve is filled into a tritium water absorption chamber through a threaded pipe.
Further, the molecular sieve is also weighed before being loaded into the tritium water absorption chamber through a threaded tube.
Further, the tightness detection specifically includes: after the waste filter element and the threaded pipe provided with the molecular sieve are weighed and are respectively filled into the heating chamber and the tritium water absorption chamber, inert gas is filled into the heating chamber and the tritium water absorption chamber until the pressure reaches a preset pressure value, the air filling is stopped, the pressure is maintained for a preset time, and whether the tightness is qualified is judged by whether the pressure of the heating chamber and the tritium water absorption chamber is kept constant during the pressure maintaining.
Further, the predetermined time is 24 hours.
Further, the predetermined pressure is 0.2.+ -. 0.02kpa.
Further, the predetermined temperature is 150±5 ℃.
Further, the weights of the waste filter element and the molecular sieve in the heating chamber and the tritium water absorption chamber are recorded respectively every 10 min.
Further, when the pressure in the heating chamber is increased to 1.5-2.0 times of the pressure in the tritium water absorption chamber in the heating process, the pressure needs to be discharged.
The invention also provides a heating tritium removal device for the movable heavy water reactor waste filter element, which comprises: the replacement module is used for opening a top cover of the waste filter element disposal pit to be treated, weighing the waste filter element, placing the waste filter element into a heating chamber, and closing the heating chamber; the dosage determining module is used for determining the dosage of the molecular sieve, and filling the molecular sieve into the tritium water absorption chamber and communicating the molecular sieve with the heating chamber; the heating module is used for heating the heating chamber after discharging the leak detection gas in the heating chamber and maintaining the temperature in the heating chamber at a preset temperature; the recording module is used for respectively recording the weights of the heating chamber, the tritium water absorption indoor waste filter element and the molecular sieve during the heating period, and stopping heating when the weights are unchanged; and the inflation module is used for repeatedly filling inert gas into the heating chamber after stopping heating so as to send residual tritium water or tritium water gas in the heating chamber into the tritium water absorption chamber for complete absorption.
The invention has the following effects: the method can realize the efficient heating removal of tritium water adsorption by the waste filter element and the adsorption purification of tritium, obviously reduce the content of tritium water in the waste filter element and the contact dosage rate of the tritium water, and provide a basis for the disposal and the reception of the waste filter element. Meanwhile, the sealing device has good sealing performance, and can ensure operation safety, site radiation safety and personnel and environment safety.
Drawings
FIG. 1 is a flow diagram illustration of a method of heating tritium removal from a mobile heavy water stack spent filter cartridge;
FIG. 2 is a schematic diagram of a mobile heavy water reactor waste filter cartridge heating tritium removal device.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
As shown in FIG. 1, the invention provides a heating tritium removal method for a movable heavy water reactor waste filter element, which comprises the following steps:
s1, opening a top cover of a waste filter element disposal pit to be treated, weighing the waste filter element, placing the waste filter element into a heating chamber, and closing the heating chamber;
specifically, remove this device near treating useless filter core and handle the hole, open device heating chamber top cap and treat useless filter core and handle hole top cap, long-range line hanging operation lifts up useless filter core and weighs, record weight M1 (initial weight M0), put into the device heating chamber with useless filter core after weighing finishes, close the heating chamber top cap.
S2, determining the dosage of the molecular sieve, and filling the molecular sieve into a tritium water absorption chamber and communicating the molecular sieve with a heating chamber;
specifically, a molecular sieve is filled in a tritium water absorption chamber to absorb tritium water: molecular sieve amount v= { (M1-M0)/100 g } l; molecular sieve in 110-120% V amount is filled into the tritium water absorbing chamber pipeline.
Further, the molecular sieve is filled into a tritium water absorption chamber through a threaded pipe.
Further, the molecular sieve is also weighed before being loaded into the tritium water absorption chamber through a threaded tube.
S3, detecting tightness;
specifically, after the waste filter element and the threaded pipe provided with the molecular sieve are weighed and are respectively filled into the heating chamber and the tritium water absorption chamber, inert gas is filled into the heating chamber and the tritium water absorption chamber until the pressure reaches a preset pressure value, the air filling is stopped, the pressure is maintained for a preset time, and whether the tightness is qualified is judged by whether the pressure of the heating chamber and the tritium water absorption chamber is kept constant during the pressure maintaining.
Further, the predetermined time is 24 hours.
Further, the predetermined pressure is 0.2.+ -. 0.02kpa.
S4, after the leak detection gas in the heating chamber is discharged, heating the heating chamber, and maintaining the temperature in the heating chamber at a preset temperature;
specifically, after the leak detection gas is released, a heater in the heating chamber is started, and the temperature is controlled within a preset temperature range.
Further, the predetermined temperature is 150.+ -. 5 ℃.
S5, respectively recording the weights of the heating chamber, the tritium water absorption indoor waste filter element and the molecular sieve during the heating period, and stopping heating when the weights are unchanged;
Specifically, the weights of the heating chamber, the tritium water absorption indoor waste filter element and the threaded pipe (molecular sieve) are recorded every 10min in the heating process, and the heating is stopped when the weights are recorded to have no obvious change.
In this embodiment, the venting is performed if the pressure in the heating chamber increases to 1.5-2.0 times the tritium water absorption chamber during heating.
S6, after stopping heating, repeatedly filling inert gas into the heating chamber to send residual tritium water or tritium water gas in the heating chamber into a tritium water absorption chamber for complete absorption;
Specifically, after stopping heating, filling inert gas into the heating chamber, and sending residual tritium water or tritium water gas in the heating chamber into a tritium water absorption chamber through the inert gas, and repeating the operation for 3 times to completely absorb the residual tritium water or tritium water gas in the heating chamber.
Further, after the residual tritium water or tritium water gas in the heating chamber is completely absorbed, the tail gas is also required to be treated.
Further, after the residual tritium water or tritium water gas in the heating chamber is completely absorbed, the method further comprises the steps of:
s7, taking out the molecular sieve in the threaded pipe of the tritium water absorption chamber after the whole device is completely cooled, putting the molecular sieve into a closed container, and simultaneously sampling the molecular sieve in the tail gas treatment chamber and putting the molecular sieve into the closed container; laboratory analysis was performed on the samples taken to measure tritium water activity levels.
Further, after the residual tritium water or tritium water gas in the heating chamber is completely absorbed, the method further comprises the steps of:
S8, temporarily storing the treated filter element in a disposal pit or conveying the filter element to a detection conveying place at a designated place, and loading the molecular sieve in the tritium adsorption device into a waste bin for sealing temporary storage or cement fixing treatment.
As shown in FIG. 2, the invention also provides a heating tritium removal device for the filter element of the movable heavy water reactor waste filter, which comprises the following components:
the replacement module is used for opening a top cover of the waste filter element disposal pit to be treated, weighing the waste filter element, placing the waste filter element into a heating chamber, and closing the heating chamber;
the dosage determining module is used for determining the dosage of the molecular sieve, and filling the molecular sieve into the tritium water absorption chamber and communicating the molecular sieve with the heating chamber;
the heating module is used for heating the heating chamber after discharging the leak detection gas in the heating chamber and maintaining the temperature in the heating chamber at a preset temperature;
the recording module is used for respectively recording the weights of the heating chamber, the tritium water absorption indoor waste filter element and the molecular sieve during the heating period, and stopping heating when the weights are unchanged;
and the inflation module is used for repeatedly filling inert gas into the heating chamber after stopping heating so as to send residual tritium water or tritium water gas in the heating chamber into the tritium water absorption chamber for complete absorption.
Referring to fig. 2, taking a specific example as an illustration, the operation flow of the device is as follows:
Firstly, the device is moved to the vicinity of a waste filter element treatment pit to be treated, a device heating chamber (hereinafter referred to as a chamber A) top cover and a waste filter element treatment pit top cover to be treated are opened, a remote crane operation is used for lifting the waste filter element to weigh, the weight M1 (initial weight M0) is recorded, the waste filter element is placed into the device heating chamber after the weighing is finished, and the heating chamber top cover is closed. Determining the molecular sieve dosage and loading the molecular sieve before the movable tritium adsorption module operates: molecular sieve amount v= { (M1-M0)/100 g } l; the molecular sieve with the volume of 110-120% V is filled into a tritium water adsorption chamber (hereinafter referred to as a B chamber). The method comprises the steps of weighing a wastewater filter core and a threaded pipe filled with a molecular sieve, respectively filling the wastewater filter core and the threaded pipe into a chamber A and a chamber B, correcting a quality sensor, closing valves 1, 2 and 3, filling a certain amount of inert gas into the chamber A and the chamber B through a valve at the top of the chamber A/B, closing an external gas cylinder to stop filling when the pressure gauge value shows that the pressure gauge value reaches 0.2+/-0.02 kpa, and maintaining the pressure and detecting the leakage for 24 hours; and meanwhile, performance detection of the pressure gauge and operation and sealing performance detection of related pipelines and valves are carried out. In the pressure maintaining process, the treatment pit is sealed by an A/B indoor pressure value judging device; in the pressure maintaining process, the pressure value is kept constant, and the pressure maintaining and leakage detecting are qualified. And after the tightness of the device is qualified, opening the valve No. 3 and the valve No. 4, and slowly opening the valve No. 2 and the valve No. 1 respectively to finish the gas release of the A/B chamber. Closing the valve No. 3, opening the valves No. 1 and No. 2, starting the chamber A heater, and controlling the temperature within the range of 150+/-5 ℃; the weights of the wastewater filter cores and the threaded pipes in the chamber A and the chamber B are recorded once every 10min in the heating process, and the heating is stopped when the weights are recorded to have no obvious change; (if the pressure of the chamber A is increased to 1.5-2.0 times that of the chamber B in the heating process, the valve number 3 and the valve number 4 are opened for discharging pressure). After stopping heating, closing the valve No. 2 and the valve No. 3, filling a certain amount of inert gas into the chamber A, then opening the valve No. 3, slowly opening the valve No. 2, and slowly discharging the gas in the chamber A; repeating the operation for 3 times, completely absorbing residual tritium water or tritium water gas in the A chamber, opening a valve No. 4, absorbing tail gas, and then closing all the valves. Taking out the molecular sieve in the threaded pipe of the chamber B and putting the molecular sieve into a closed container after the whole set of device is completely cooled, and simultaneously sampling the molecular sieve in the chamber C and putting the molecular sieve into the closed container; laboratory analysis was performed on the samples taken to measure tritium water activity levels. The treated filter element can be temporarily stored in a disposal pit (the top cover of the original disposal pit is sealed) or transported to a detection and transportation position at a designated place, and the molecular sieve in the tritium adsorption device is filled into a waste bucket for sealing temporary storage or cement fixing treatment.
According to the embodiment, the high-efficiency heating removal of tritium water adsorbed by the waste filter element and the adsorption purification of tritium can be realized, the content of tritium water in the waste filter element is obviously reduced, the contact dosage rate of the tritium water is reduced, and a foundation is provided for the disposal and the reception of the waste filter element. Meanwhile, the sealing device has good sealing performance, and can ensure operation safety, site radiation safety and personnel and environment safety.
The embodiments of the present invention are not limited to the embodiments described in the specific embodiments, and those skilled in the art may obtain other embodiments according to the technical solutions of the present invention, which also belong to the technical innovation scope of the present invention.
Claims (10)
1. A heating tritium removal method for a movable heavy water pile waste filter element is characterized by comprising the following steps:
opening a top cover of a waste filter element disposal pit to be treated, weighing the waste filter element, placing the waste filter element into a heating chamber, and closing the heating chamber;
determining the dosage of the molecular sieve, and filling the molecular sieve into a tritium water absorption chamber and communicating the molecular sieve with a heating chamber;
performing tightness detection;
After the leak detection gas in the heating chamber is exhausted, the heating chamber is heated, and the temperature in the heating chamber is maintained at a preset temperature;
During the heating period, the weights of the heating chamber, the tritium water absorption indoor waste filter element and the molecular sieve are respectively recorded, and the heating is stopped when the weights are unchanged;
and after stopping heating, repeatedly filling inert gas into the heating chamber to send residual tritium water or tritium water gas in the heating chamber into a tritium water absorption chamber for complete absorption.
2. The method for heating and removing tritium from a mobile heavy water pile waste filter cartridge according to claim 1, which is characterized by the following steps:
the molecular sieve is filled into a tritium water absorption chamber through a threaded pipe.
3. A method of heating a mobile heavy water reactor waste filter cartridge to remove tritium as recited in claim 2, wherein:
the molecular sieve is also weighed before being loaded into the tritium water absorption chamber through a threaded tube.
4. The method for heating and removing tritium from a mobile heavy water pile waste filter cartridge according to claim 1, which is characterized by the following steps:
The tightness detection is specifically as follows: after the waste filter element and the threaded pipe provided with the molecular sieve are weighed and are respectively filled into the heating chamber and the tritium water absorption chamber, inert gas is filled into the heating chamber and the tritium water absorption chamber until the pressure reaches a preset pressure value, the air filling is stopped, the pressure is maintained for a preset time, and whether the tightness is qualified is judged by whether the pressure of the heating chamber and the tritium water absorption chamber is kept constant during the pressure maintaining.
5. The method for heating and removing tritium from a mobile heavy water pile waste filter cartridge as claimed in claim 4, wherein:
The predetermined time is 24 hours.
6. The method for heating and removing tritium from a mobile heavy water pile waste filter cartridge as claimed in claim 4, wherein:
The predetermined pressure is 0.2 + -0.02 kpa.
7. The method for heating and removing tritium from a mobile heavy water pile waste filter cartridge according to claim 1, which is characterized by the following steps:
The predetermined temperature is 150 + -5 deg.c.
8. The method for heating and removing tritium from a mobile heavy water pile waste filter cartridge according to claim 1, which is characterized by the following steps:
the weights of the waste filter element and the molecular sieve in the heating chamber and the tritium water absorption chamber are recorded respectively every 10 min.
9. The method for heating and removing tritium from a mobile heavy water pile waste filter cartridge according to claim 1, which is characterized by the following steps:
when the pressure in the heating chamber is increased to 1.5-2.0 times of the pressure in the tritium water absorption chamber in the heating process, the pressure needs to be discharged.
10. The utility model provides a portable heavy water heap useless filter core heating removes tritium device which characterized in that includes:
the replacement module is used for opening a top cover of the waste filter element disposal pit to be treated, weighing the waste filter element, placing the waste filter element into a heating chamber, and closing the heating chamber;
the dosage determining module is used for determining the dosage of the molecular sieve, and filling the molecular sieve into the tritium water absorption chamber and communicating the molecular sieve with the heating chamber;
the heating module is used for heating the heating chamber after discharging the leak detection gas in the heating chamber and maintaining the temperature in the heating chamber at a preset temperature;
the recording module is used for respectively recording the weights of the heating chamber, the tritium water absorption indoor waste filter element and the molecular sieve during the heating period, and stopping heating when the weights are unchanged;
and the inflation module is used for repeatedly filling inert gas into the heating chamber after stopping heating so as to send residual tritium water or tritium water gas in the heating chamber into the tritium water absorption chamber for complete absorption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311801327.4A CN117976278A (en) | 2023-12-25 | 2023-12-25 | Method and device for heating and tritium removal of filter element of movable heavy water reactor waste filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311801327.4A CN117976278A (en) | 2023-12-25 | 2023-12-25 | Method and device for heating and tritium removal of filter element of movable heavy water reactor waste filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117976278A true CN117976278A (en) | 2024-05-03 |
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ID=90852387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311801327.4A Pending CN117976278A (en) | 2023-12-25 | 2023-12-25 | Method and device for heating and tritium removal of filter element of movable heavy water reactor waste filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117976278A (en) |
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2023
- 2023-12-25 CN CN202311801327.4A patent/CN117976278A/en active Pending
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