CN108922644B - Off-line circulating cooling device and cooling method - Google Patents
Off-line circulating cooling device and cooling method Download PDFInfo
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- CN108922644B CN108922644B CN201810563839.4A CN201810563839A CN108922644B CN 108922644 B CN108922644 B CN 108922644B CN 201810563839 A CN201810563839 A CN 201810563839A CN 108922644 B CN108922644 B CN 108922644B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F5/00—Transportable or portable shielded containers
- G21F5/06—Details of, or accessories to, the containers
- G21F5/10—Heat-removal systems, e.g. using circulating fluid or cooling fins
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- 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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Abstract
The invention belongs to the technical field of nuclear fuel post-treatment, and particularly relates to an off-line circulating cooling device and a cooling method for a spent fuel transport container. The device comprises a water tank, a circulating pump, a flowmeter, a liquid level meter, a water level controller, a first manual control valve, a second manual control valve, a regulating valve, a first check valve, a second check valve, a first pneumatic control valve, a second pneumatic control valve, a third manual control valve and a fourth manual control valve. The method comprises the steps of 1, desalting water 1.1m 3 A/h flow injection stage; step 2, boric acid solution 1.1m 3 A/h injection stage; step 3, boric acid solution 2.2m 3 A/h cycle phase; step 4, boric acid solution full-flow circulation stage; and 5, stopping the machine. The invention is used for discharging the high-temperature helium in the inner cavity and reducing the temperature of the outer surface.
Description
Technical Field
The invention belongs to the technical field of nuclear fuel post-treatment, and particularly relates to an off-line circulating cooling device and a cooling method for a spent fuel transport container.
Background
As the service time of the nuclear power unit is prolonged, spent fuel assemblies generated by operation accumulate year by year, approaching to the design capacity of a spent fuel pool, and the transportation of spent fuel out of the spent fuel pool by using a transportation container must be considered. The method is characterized in that a VVER stack type spent fuel transportation special container TUK-153 is used as a reference, the VVER stack type spent fuel transportation container is manufactured by Russian design, TUK-153 type spent fuel transportation container is required to be filled with 0.08MPa (a) helium after the charging operation is completed, so that the heat balance between a spent fuel assembly cladding and a cavity is established, the highest temperature of the spent fuel assembly in the transportation container reaches 273 ℃ after the spent fuel assembly cladding reaches a heat balance state according to design calculation, the average temperature of the helium in an inner cavity reaches about 200 ℃, the pressure is 0.137Mpa, and the temperature of a container shell exceeds 85 ℃. Before the unloading operation, the inner cavity of the container is required to be filled with water and exhausted, and meanwhile, the cooling circulation is carried out, so that the temperature of the outer surface of the spent fuel transportation container is less than 50 ℃, and a series of operations such as unloading, removing the outer cover and the like are convenient to follow-up.
In the prior art, other types of spent fuel containers have not had cooling circulation systems at the after-treatment plant nor have offline circulation processes been considered.
Disclosure of Invention
The invention solves the technical problems that: aiming at the defects of the prior art, the invention provides an off-line circulating cooling device and a cooling method for a spent fuel transport container, which are used for discharging high-temperature helium in an inner cavity and reducing the temperature of the outer surface.
The invention adopts the technical scheme that:
the utility model provides an off-line circulation cooling device for spent fuel transport container, which comprises a water tank, the circulating pump, the flowmeter, the liquid level meter, water level controller, manual control valve I, manual control valve II, the governing valve, check valve I, check valve II, pneumatic control valve I, pneumatic control valve II, manual control valve III, manual control valve IV, the water tank passes through the pipeline and is connected with the one end of manual control valve I, the other end of manual control valve I is connected with the tee bend, three-way other two passageways are connected with the circulating pump respectively, manual control valve II, the other end of circulating pump has connected gradually the flowmeter, the governing valve, check valve II, the other end of check valve II communicates with the container storage chamber, the gas vent and the water level controller in container storage chamber are connected, the water level controller bottom is through parallelly connected pneumatic control valve II, manual control valve IV communicates with the spent pool, be equipped with the liquid level meter on the water level controller, water level controller loops through manual control valve III, pneumatic control valve I is connected with the gas processing unit.
The water tank is used for storing desalted water for cooling, and the introduction of the desalted water avoids boric acid crystallization caused by higher temperature in the storage cavity of the spent fuel transportation container in the initial stage when the spent fuel transportation container is directly used for circulating cooling by using the spent fuel boric acid solution.
The first manual control valve and the second manual control valve are connected with the circulating pump as a demineralized water loop, the second manual control valve is positioned in the spent fuel pool, boric acid is connected with the circulating water pump loop, the circulating cooling loop can be switched by controlling the switching states of the first manual control valve and the second manual control valve, and continuous connection of the demineralized water loop and the boric acid loop during cooling is realized.
The first check valve is used as the circulating water pump, a centrifugal pump or a self-priming pump is selected as the circulating water pump, when the centrifugal pump is used as the circulating loop pump, the pump is started up after full water is needed, and the first check valve is additionally arranged in the system because the liquid level of the spent pool is below the water pump; ensure that the centrifugal pump smoothly establishes boric acid circulation.
The flow of the circulation loop can be regulated by controlling the opening of the regulating valve through the flow meter, so that the exhaust rate of the storage cavity of the spent fuel transportation container and the cooling circulation cooling water rate are controlled, and the cooling circulation time is further controlled.
When the second check valve is used for establishing circulation, the circulation water pump is additionally provided with the second check valve to prevent water from flowing back to the water pump, so that the protection effect is achieved.
The liquid level controller, the liquid level meter, the pneumatic valve and the gas treatment unit are needed to be passed through by helium in the storage cavity, when the gas enters, the manual control valve III is opened, the helium passes through the gas treatment unit, when the circulating medium enters, the liquid level meter is used for monitoring, when the liquid level reaches 30cm, the pneumatic valve is automatically closed, and the pneumatic valve is opened simultaneously, so that a loop of the spent pool cooling circulation is formed.
And when the pneumatic valve cannot be closed, the manual control valve III is manually closed, so that circulating water is prevented from entering the gas treatment unit.
And when the pneumatic valve cannot be opened, the manual control valve IV is opened manually, so that the phenomenon that the circulating cooling loop cannot return to the spent pool is avoided.
An off-line recirculating cooling method for spent fuel transport vessels, comprising the steps of:
step 1, desalted water 1.1m 3 A/h flow injection stage;
step 2, boric acid solution 1.1m 3 A/h injection stage;
step 3, boric acid solution 2.2m 3 A/h cycle phase;
step 4, boric acid solution full-flow circulation stage;
after a boric acid cooling circulation loop is established between the container and the spent pool through a water pump, the regulating valve is fully opened according to the temperature of the spent pool water and the cooling requirement of the outer surface of the container, so that the temperature of the spent fuel transfer container is further reduced to a preset temperature under the cooling of a large-flow circulating cooling medium;
step 5, stopping the machine;
when the temperature of the spent fuel transport vessel is reduced to a predetermined temperature, the operation of the device may be stopped.
The step 1 comprises the following steps:
step 1.1, 1.2m of water is injected into the water tank 3 The pipeline is filled with desalted water synchronously;
step 1.2, opening a first manual control valve, a regulating valve, a third manual control valve and a first pneumatic control valve, and closing a second manual control valve;
step 1.3, connecting an inlet of the device with a spent fuel transfer container storage cavity through a metal hose, delivering the spent fuel transfer container storage cavity to the bottom of the container storage cavity, and connecting an exhaust port of the spent fuel transfer container storage cavity with a water level controller;
step 1.4, filling boric acid solution in advance in a pipeline between the manual control valve II and the check valve I;
step 1.5, starting the circulating pump, and adjusting the opening of the regulating valve to enable the reading of the flowmeter to be 1.1m 3 /h；
Step 1.6, the storage cavity volume of the spent fuel transport container is 6m 3 The demineralized water is thus injected into the vessel at this stage and the helium in the vessel is removed to the gas treatment unit.
The step 2 comprises the following steps:
step 2.1, reading the accumulated flow of the flowmeter, wherein the accumulated flow reaches 1m 3 When the first control valve is opened, the second control valve is closed, the opening of the regulating valve is kept unchanged, and the switching of the boric acid solution circulating cooling loop and the desalted water circulating cooling loop is completed;
step 2.2, observing the reading of the flowmeter, when the accumulated flow reaches 6m 3 When focusing on the water level controller state;
step 2.3, thus the spent fuel transport vessel is not filled, at this time with boric acid solution at 1.1m 3 And/h injection stage into the vessel.
The step 3 comprises the following steps:
step 3.1, paying attention to the liquid level state of the water level controller, and when the water level controller is provided with a liquid level display by a liquid level meter, indicating that helium in the inner cavity of the container is completely discharged;
step 3.2, adjusting the opening of the regulating valve to enable the reading of the flowmeter to be 2.2m 3 And/h, when the reading of the liquid level meter on the side wall of the water level controller is 30cm, closing the first pneumatic control valve, opening the second pneumatic control valve, and establishing a boric acid cooling circulation loop between the container and the spent pool through a water pump; if the pneumatic valve logic fails, the manual control valve III is manually closed, the manual control valve IV is opened, and a circulation loop is established.
The invention has the beneficial effects that:
the post-treatment of the spent fuel is an essential process for the development of a subsequent nuclear power station, and the research and development and application of the spent fuel cooling circulation device and method ensure the integrity of a spent fuel assembly in the spent fuel transferring process, ensure the safety of equipment and personnel in the operation process and provide preconditions for the operation and power generation of a power station unit. The transfer of the spent fuel factory is carried out internationally for the first time, and the research and the application of the equipment provide reference for the transfer of the spent fuel, thereby having obvious economic benefit.
By introducing the circulating cooling device, helium in the container is discharged on one hand, and the container is circulated and cooled on the other hand.
Drawings
FIG. 1 is a schematic diagram of an off-line cooling unit for spent fuel transport vessels according to the present invention;
in the figure: the device comprises a 1-water tank, a 2-circulating pump, a 3-flowmeter, a 4-liquid level meter, a 5-water level controller, a 6-manual control valve I, a 7-manual control valve II, an 8-regulating valve, a 9-check valve I, a 10-check valve II, an 11-pneumatic control valve I, a 12-pneumatic control valve II, a 13-manual control valve III and a 14-manual control valve IV.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific examples.
As shown in fig. 1, the offline circulating cooling device for the spent fuel transport container provided by the invention comprises a water tank 1, a circulating pump 2, a flowmeter 3, a liquid level meter 4, a water level controller 5, a first manual control valve 6, a second manual control valve 7, a regulating valve 8, a first check valve 9, a second check valve 10, a first pneumatic control valve 11, a second pneumatic control valve 12, a third manual control valve 13 and a fourth manual control valve 14, wherein the water tank 1 is connected with one end of the first manual control valve 6 through a pipeline, the other end of the first manual control valve 6 is connected with a tee joint, the other two passages of the tee joint are respectively connected with the circulating pump 2 and the second manual control valve 7, the other end of the circulating pump 2 is sequentially connected with the flowmeter 3, the regulating valve 8 and the second check valve 10, the other end of the second check valve 10 is communicated with a container storage cavity, an exhaust port of the container storage cavity is connected with the water level controller 5, the water level controller 5 is sequentially connected with the third manual control valve 13 and the pneumatic control valve 11 through the fourth pneumatic control valve 14 which are connected with a spent fuel pool.
The device is provided with the water tank 1 for storing desalted water for cooling, and the introduction of the desalted water avoids boric acid crystallization caused by higher temperature in the storage cavity of the spent fuel transportation container in the initial stage when the spent fuel transportation container is directly used for circulating cooling by using the spent fuel boric acid solution;
the system is provided with a first manual control valve 6 and a second manual control valve 7, wherein the first manual control valve 6 is used as a demineralized water loop and is connected with the circulating pump 2, the second manual control valve 7 is positioned in the spent fuel pool boric acid and is connected with the circulating water pump loop, and the circulating cooling loop can be switched by controlling the on-off state of the first manual control valve 6 and the second manual control valve 7 so as to realize continuous connection when the demineralized water loop and the boric acid loop are cooled;
be provided with check valve one 9, circulating pump selects centrifugal pump or self priming pump to use, when using centrifugal pump as the circulation loop pump, needs to carry out full water and plays the pump, because of the spent pool liquid level is below the water pump, and the system installs check valve one 9 additional. Ensuring that the centrifugal pump 2 smoothly establishes boric acid circulation;
the flow rate of the circulation loop can be regulated by controlling the opening of the regulating valve 8, so as to control the exhaust rate of the storage cavity of the spent fuel transport container and the cooling circulation cooling water rate and further control the cooling circulation time;
when the circulating water pump is used for establishing circulation, the second check valve 10 is additionally arranged on the pump outlet to prevent water from flowing back to the water pump, so that the circulating water pump is prevented from being influenced by overlarge helium pressure because helium with a certain pressure exists in the storage cavity of the container;
the device is provided with a water level controller 5, a liquid level meter 4 and pneumatic valves 11 and 12, helium gas needs to pass through a gas treatment unit because of the existence of the helium gas in the storage cavity, when the gas enters the liquid level controller 5, the manual control valves III and 11 are opened, the helium gas passes through the gas treatment unit, when a circulating medium enters the liquid level controller 5, the liquid level controller 4 monitors the helium gas, when the liquid level reaches 30cm, the pneumatic valve 11 is automatically closed, and meanwhile, the pneumatic valve 12 is opened, so that a loop of a spent pool cooling cycle is formed;
the manual control valve III 13 is arranged, and when the pneumatic valve 11 cannot be closed, the manual control valve III 13 is manually closed, so that circulating water is prevented from entering the gas treatment unit;
the manual control valve IV 14 is arranged, when the pneumatic valve 12 cannot be opened, the manual control valve IV 14 is manually opened, and the phenomenon that the circulating cooling loop cannot return to the spent pool is avoided.
The invention provides an off-line circulating cooling method for a spent fuel transport container, which comprises the following steps of:
step 1, desalted water 1.1m 3 A/h flow injection stage:
step 1.1, 1.2m of water is injected into the water tank 1 3 The pipeline is filled with desalted water synchronously;
step 1.2, opening a first manual control valve 6, a regulating valve 8, a third manual control valve 13, a first pneumatic control valve 11 and closing a second manual control valve 7;
step 1.3, connecting an inlet of the device with a spent fuel transfer container storage cavity through a metal hose, delivering the spent fuel transfer container storage cavity to the bottom of the container storage cavity, and connecting an exhaust port of the spent fuel transfer container storage cavity with a water level controller 5;
step 1.4, filling boric acid solution in advance in a pipeline between a manual control valve II 7 and a check valve I9;
step 1.5, starting the circulating pump 2, and adjusting the opening of the regulating valve 8 to enable the reading of the flowmeter 3 to be 1.1m 3 /h；
Step 1.6, the storage cavity volume of the spent fuel transport container is 6m 3 The demineralized water is thus injected into the vessel at this stage and the helium in the vessel is removed to the gas treatment unit.
Step 2, boric acid solution 1.1m 3 /h injection phase:
step 2.1, reading the accumulated flow of the flowmeter 3, wherein the accumulated flow reaches 1m 3 When the boric acid solution circulating cooling loop and the demineralized water circulating cooling loop are switched, the manual control valve II 7 is gradually opened, the manual control valve I6 is closed, the opening of the regulating valve 8 is kept unchanged, and the boric acid solution circulating cooling loop and the demineralized water circulating cooling loop are switched;
step 2.2, observing the reading of the flowmeter 3, when the accumulated flow reaches 6m 3 When focusing on the water level controller 5 state;
step 2.3, thus the spent fuel transport vessel is not filled, at this time with boric acid solution at 1.1m 3 And/h injection stage into the vessel.
Step 3, boric acid solution 2.2m 3 Cycle phase/h
Step 3.1, focusing on the liquid level state of the water level controller 5, and when the liquid level controller 5 has liquid level display by the self-provided liquid level meter 4, indicating that helium in the inner cavity of the container is completely discharged;
step 3.2, adjusting the opening of the regulating valve 8 to enable the reading of the flowmeter 3 to be 2.2m 3 And/h, when the reading of the side wall liquid level meter 4 of the water level controller 5 is 30cm, the pneumatic control valve I11 is closed, the pneumatic control valve II 12 is opened, and a boric acid cooling circulation loop is established between the container and the spent pool through a water pump. If the pneumatic valve logic fails, the hand is manually closedAnd the third control valve 13 is moved, the fourth manual control valve 14 is opened, and a circulation loop is established.
Step 4, boric acid solution full flow circulation stage
After a boric acid cooling circulation loop is established between the container and the spent pool through a water pump, the regulating valve 8 is fully opened according to the temperature of the spent pool water and the cooling requirement of the outer surface of the container, so that the temperature of the spent fuel transfer container is further reduced to a preset temperature under the cooling of a large-flow circulating cooling medium.
Step 5, stopping the machine
When the temperature of the spent fuel transport vessel is reduced to a predetermined temperature, the operation of the device may be stopped.
(1) Closing the circulating water pump 2;
(2) Observing the display value of the liquid level meter 4, and confirming that the water in the water level controller is completely drained;
(3) Dismantling a hose connected with the spent fuel transfer container at the inlet of the device;
(4) Evacuating the hose of residual circulating cooling medium;
(5) Removing a hose with a water outlet connected to the spent fuel pool;
(6) Evacuating the hose of residual circulating cooling medium.
Claims (6)
1. An off-line circulation cooling device for spent fuel transport container, which is characterized in that: the device comprises a water tank (1), a circulating pump (2), a flowmeter (3), a liquid level meter (4), a water level controller (5), a manual control valve I (6), a manual control valve II (7), a regulating valve (8), a check valve I (9), a check valve II (10), a pneumatic control valve I (11), a pneumatic control valve II (12), a manual control valve III (13) and a manual control valve IV (14), wherein the water tank (1) is connected with one end of the manual control valve I (6) through a pipeline, the other end of the manual control valve I (6) is connected with a tee joint, the other two paths of the tee joint are respectively connected with the circulating pump (2) and the manual control valve II (7), the other end of the circulating pump (2) is sequentially connected with the flowmeter (3), the regulating valve (8) and the check valve II (10), the other end of the check valve II (10) is communicated with a container storage cavity, an exhaust port of the container storage cavity is connected with the water level controller (5), the bottom of the water level controller (5) is communicated with the pneumatic control valve II (12) and the manual control valve IV (14) through a parallel connection, the water level controller (5) is provided with the water level controller (5), and the pneumatic control valve III is sequentially connected with the pneumatic control valve (11) through the pneumatic control valve III;
the manual control valve I (6) and the manual control valve II (7), the manual control valve I (6) is used as a demineralized water loop and is connected with the circulating pump (2), the manual control valve II (7) is positioned in the spent fuel pool boric acid and is connected with the circulating water pump loop, the circulating cooling loop can be switched by controlling the switching state of the manual control valve I (6) and the manual control valve II (7), and the continuous connection of the demineralized water loop and the boric acid loop during cooling is realized;
the first check valve (9) is selected from a centrifugal pump or a self-priming pump, when the centrifugal pump is used as a circulating loop pump, the pump is started up after full water is needed, and the first check valve (9) is additionally arranged in the system because the liquid level of the spent pool is below the water pump; ensuring that the centrifugal pump (2) smoothly establishes boric acid circulation;
the flow of the circulation loop can be regulated by controlling the opening of the regulating valve (8) through the regulating valve (8) and the flowmeter (3), so that the exhaust rate of the storage cavity of the spent fuel transportation container and the cooling circulation cooling water rate are controlled, and the cooling circulation time is further controlled;
when the circulating water pump establishes circulation, the second check valve (10) is additionally arranged at the pump outlet to prevent water from flowing back to the water pump, so that the circulating water pump is prevented from being influenced by overlarge helium pressure due to the existence of helium with certain pressure in the storage cavity of the container;
the water level controller (5), the liquid level meter (4) and the pneumatic valves (11) and (12) are arranged in the storage cavity, helium gas needs to pass through the gas treatment unit, when the gas enters the liquid level controller (5), the manual control valves III (13) and (11) are opened, the helium gas passes through the gas treatment unit, when a circulating medium enters the liquid level controller (5), the liquid level controller (4) monitors, when the liquid level reaches 30cm, the pneumatic valve (11) is automatically closed, and meanwhile, the pneumatic valve (12) is opened, so that a loop of a spent pool cooling cycle is formed;
the manual control valve III (13) is manually closed when the pneumatic valve (11) cannot be closed, so that circulating water is prevented from entering the gas treatment unit;
and when the pneumatic valve (12) cannot be opened, the manual control valve IV (14) is manually opened, so that the phenomenon that the circulating cooling loop cannot return to the spent pool is avoided.
2. An off-line cooling circulation device for spent fuel transport container according to claim 1, wherein: the water tank (1) is used for storing desalted water for cooling, and the introduction of the desalted water avoids boric acid crystallization caused by higher temperature in the storage cavity of the spent fuel transportation container in the initial stage when the spent fuel transportation container is directly used for circulating cooling by using the spent fuel boric acid solution.
3. An off-line cooling method for an off-line cooling-by-circulation device for spent fuel transport vessels according to claim 1, wherein: the method comprises the following steps:
step (1), desalted water 1.1m 3 A/h flow injection stage;
step (2), boric acid solution 1.1m 3 A/h injection stage;
step (3), boric acid solution 2.2m 3 A/h cycle phase;
step (4), boric acid solution full-flow circulation stage;
after a boric acid cooling circulation loop is established between the container and the spent pool through a water pump, the regulating valve (8) is fully opened according to the temperature of the spent pool water and the cooling requirement of the outer surface of the container, so that the temperature of the spent fuel transfer container is further reduced to a preset temperature under the cooling of a large-flow circulating cooling medium;
step (5), stopping the machine;
when the temperature of the spent fuel transport vessel is reduced to a predetermined temperature, the operation of the device may be stopped.
4. An off-line cooling method for spent fuel transport vessel according to claim 3, wherein: the step (1) comprises:
step (1.1), injecting 1.2m into the water tank (1) 3 The pipeline is filled with desalted water synchronously;
step (1.2), opening a first manual control valve (6), a regulating valve (8), a third manual control valve (13), a first pneumatic control valve (11) and closing a second manual control valve (7);
step (1.3, the device inlet is connected with the spent fuel transfer container storage cavity through a metal hose and is sent to the bottom of the container storage cavity, and the exhaust port of the spent fuel transfer container storage cavity is connected with a water level controller (5);
step (1.4), the pipeline between the manual control valve II (7) and the check valve I (9) is filled with boric acid solution in advance;
step (1.5), starting the circulating pump (2), and adjusting the opening of the regulating valve (8) to enable the reading of the flowmeter (3) to be 1.1m 3 /h；
Step (1.6), the storage cavity volume of the spent fuel transportation container is 6m 3 The demineralized water is thus injected into the vessel at this stage and the helium in the vessel is removed to the gas treatment unit.
5. The off-line cooling method for spent fuel transport container according to claim 4, wherein: the step (2) comprises:
step (2.1), reading the accumulated flow of the flowmeter (3), wherein the accumulated flow reaches 1m 3 When the boric acid solution circulating cooling loop and the desalted water circulating cooling loop are switched, the manual control valve II (7) is gradually opened, the manual control valve I (6) is closed, the opening of the regulating valve (8) is kept unchanged, and the boric acid solution circulating cooling loop and the desalted water circulating cooling loop are switched;
step (2.2), observing the reading of the flowmeter (3) when the accumulated flow reaches 6m in month 3 When focusing on the state of the water level controller (5);
step (2.3), thus the spent fuel transport vessel is not filled, at this time with 1.1m boric acid solution 3 And/h injection stage into the vessel.
6. The off-line cooling method for spent fuel transport container according to claim 5, wherein: the step (3) comprises:
the liquid level state of the water level controller (5) is concerned, and when the liquid level controller (5) is provided with a liquid level display by the liquid level meter (4), the helium in the inner cavity of the container is completely discharged;
step (3.2), adjusting the opening of the regulating valve (8) to enable the reading of the flowmeter (3) to be 2.2m 3 When the reading of the side wall liquid level meter (4) of the water level controller (5) is 30cm, the pneumatic control valve I (11) is closed, the pneumatic control valve II (12) is opened, and a boric acid cooling circulation loop is established between the container and the spent pool through a water pump; if the pneumatic valve logic fails, the manual control valve III (13) is manually closed, the manual control valve IV (14) is opened, and a circulation loop is established.
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| Title |
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| 崔利 ; 朱健 ; 王耀东 ; 刘星 ; .核电厂乏燃料水池冷却循环泵异常跳闸原因分析及处理.水泵技术.2018,(02),全文. * |
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