CN113421672B - In-cell separation device for spent fuel storage pool and spent fuel storage system - Google Patents
In-cell separation device for spent fuel storage pool and spent fuel storage system Download PDFInfo
- Publication number
- CN113421672B CN113421672B CN202110656427.7A CN202110656427A CN113421672B CN 113421672 B CN113421672 B CN 113421672B CN 202110656427 A CN202110656427 A CN 202110656427A CN 113421672 B CN113421672 B CN 113421672B
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- China
- Prior art keywords
- spent fuel
- lugs
- pool
- fuel storage
- pump body
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- 239000002915 spent fuel radioactive waste Substances 0.000 title claims abstract description 78
- 238000003860 storage Methods 0.000 title claims abstract description 58
- 238000000926 separation method Methods 0.000 title claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 62
- 229910001868 water Inorganic materials 0.000 claims description 62
- 238000012423 maintenance Methods 0.000 claims description 22
- 238000005342 ion exchange Methods 0.000 claims description 18
- 238000004140 cleaning Methods 0.000 claims description 15
- 239000010865 sewage Substances 0.000 claims description 15
- RECVMTHOQWMYFX-UHFFFAOYSA-N oxygen(1+) dihydride Chemical group [OH2+] RECVMTHOQWMYFX-UHFFFAOYSA-N 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 238000010926 purge Methods 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000000746 purification Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000011900 installation process Methods 0.000 description 5
- 230000008439 repair process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/02—Details of handling arrangements
- G21C19/06—Magazines for holding fuel elements or control elements
- G21C19/07—Storage racks; Storage pools
-
- 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
Abstract
The invention discloses an in-cell split device for a spent fuel storage pool, which comprises: the base is arranged at a position close to the bottom in the spent fuel storage pool; an intermediate section removably mounted on the base; and a pump body detachably mounted on the intermediate section. The invention also provides a spent fuel storage system. The in-tank split device can efficiently utilize space and is convenient to install, overhaul and replace.
Description
Technical Field
The invention relates to the field of nuclear engineering, in particular to an in-cell split device for a spent fuel storage pool for stacking and destacking and a spent fuel storage system for the in-cell split device, and the in-cell split device mainly relates to an in-cell heat exchange device and an in-cell ion exchange device.
Background
In spent fuel wet storage facilities, a pool water heat exchange device and a pool water ion exchange device are key devices in a storage pool. The pool water heat exchange device is used for carrying decay heat of the spent fuel assembly through pool water and maintaining the pool water temperature of the spent fuel storage pool within a safe range under normal working conditions. The pool water ion exchange equipment is used for treating pool water by utilizing the ion exchange capacity of the ion exchange resin, effectively removing cesium, cobalt and other radioactive metal ions in the pool water and fluorine, chlorine and other ions accelerating corrosion of stainless steel, ensuring that the radioactivity of the pool water does not exceed a limit value, and further ensuring the safety of staff.
At present, the spent fuel storage pool is generally adopted by an off-pool cooling technology and an off-pool purifying technology. Specifically, the pond water needs to be transported outside the pond for cooling and filtering. The external cooling technology and the external purifying technology of the spent fuel storage pool are required to be externally installed and provided with corresponding equipment comprising a pool water heat exchange device and a pool water ion exchange device, so that extra positions and space are required to be occupied, and the pool water is conveyed to the outside of the storage pool to cause the risk of nuclear leakage pollution, so that the environment and personal safety are endangered.
In view of the above background, there is a need for a pool water heat exchange apparatus and pool water ion exchange apparatus that can efficiently utilize space and facilitate installation, overhaul, and replacement, and in addition, there is a need for a spent fuel storage pool that is environmentally friendly during pool water cooling and purification.
There is currently no similar application in the field of nuclear engineering.
Disclosure of Invention
In order to solve the inconvenience of equipment manufacture, installation, fixation, overhaul and replacement caused by external cooling and filtering of a pool, the risk of leakage pollution caused by conveying pool water to the outside of the pool is avoided, equipment installation forms of the pool water heat exchange equipment and the pool water ion exchange equipment are required to be changed, the pool water heat exchange equipment and the pool water ion exchange equipment are redesigned, and the pool water heat exchange equipment and the pool water ion exchange equipment can work in the pool.
In order to solve the above technical problems, the present invention provides an in-cell split device for a spent fuel pool, the in-cell split device comprising: a base fixedly installed in the spent fuel storage pool at a position near the bottom; an intermediate section removably mounted on the base; and a pump body detachably mounted on the intermediate section.
Preferably, the intermediate section has: the first lugs are respectively arranged on the peripheral walls of the middle section at different heights, the first lugs comprise long lugs and short lugs, the in-tank split equipment further comprises a plurality of first cantilever brackets which are respectively arranged at positions corresponding to the first lugs on the water tank wall of the spent fuel storage water tank so as to be used for supporting the first lugs, and a part of the long lugs and the cantilever brackets matched with the long lugs are positioned above the water surface of the spent fuel storage water tank.
Preferably, the bottom of the long support lugs is arranged on the peripheral wall of the middle section and extends upwards along the height direction of the middle section, the top end of the long support lugs is higher than the top of the middle section, and the number of the short support lugs is one or more and is arranged below the long support lugs.
Preferably, the pump body has: at least one second support lug arranged on the outer peripheral wall of the pump body; the in-tank split device further comprises at least one second cantilever bracket which is arranged on the water tank wall of the spent fuel storage water tank and corresponds to the second supporting lugs, the second cantilever bracket is used for supporting the first supporting lugs, and the at least one second supporting lugs of the pump body and the at least one second cantilever bracket matched with the second supporting lugs are located above the water surface of the spent fuel storage water tank.
Preferably, a first cylindrical pin is arranged on the first cantilever bracket, and a first opening matched with the first cylindrical pin is arranged on the first support lug; the second cantilever bracket is provided with a second cylindrical pin, and the first support lug is provided with a second opening matched with the second cylindrical pin.
Preferably, the device further comprises a vertical slideway, wherein the vertical slideway is arranged on the water tank wall of the spent fuel storage water tank and is arranged along the vertical direction of the water tank wall; and pump body, interlude and base all are equipped with: the guide support lug is used for being matched with the vertical slideway, and the pump body, the middle section and the base are guided to be stably installed in place through the matching of the guide support lug and the vertical slideway.
Preferably, through holes are respectively formed at the distal ends of the plurality of lugs of the middle section, through holes are respectively formed at the distal end of the at least one lug of the pump body, positioning pins are correspondingly formed at the distal ends of the cantilever supports below the water surface of the water tank wall, studs are correspondingly formed at the distal ends of the cantilever supports above the water surface of the water tank wall, wherein the displacement and rotation of the middle section in the horizontal direction are limited through the cooperation of the through holes and the positioning pins, and the displacement and rotation of the middle section and the pump body in the horizontal direction are limited through the cooperation of the through holes and the studs and the nuts matched with the studs.
Preferably, the base is fixed in the spent fuel storage pool near the bottom by a diagonal cantilever bracket mounted on the pool wall.
Preferably, the in-tank split device is a tank water heat exchange device, and the middle section is a heat exchange section; or the in-tank separation device is a tank water ion exchange device, and the middle section is an ion exchange purification section.
The invention also provides a spent fuel storage system which comprises a spent fuel storage pool and the in-pool split equipment.
Preferably, the system further comprises an overhaul replacement apparatus, the overhaul replacement apparatus comprising: the equipment maintenance replacement chamber comprises a cleaning pipeline, a purging pipeline and a sewage pipeline, wherein the sewage pipeline is positioned at the bottom of the equipment maintenance replacement chamber, the cleaning pipeline is used for providing high-pressure water flow for separating the components of the equipment in the tank, the purging pipeline is used for providing high-pressure air flow for quickly drying the components of the equipment in the tank, and the sewage pipeline is used for discharging sewage after cleaning the components of the equipment in the tank; and an overhaul crane for transporting components of the split equipment within the pool between the spent fuel storage pool and the equipment overhaul change room.
Drawings
FIG. 1 is a front view of a spent fuel pool in accordance with the present invention after the in-pool separator apparatus is installed and secured.
Fig. 2 is a side view of the spent fuel pool of the invention after the in-pool split device is installed and secured.
Fig. 3 is a top view of the spent fuel pool of the invention after the in-pool split device is installed and secured.
FIG. 4 is a schematic view of studs and locating pins for the mounting fixture system of the split device in the spent fuel pool of the invention.
Fig. 5 is a schematic view showing an installation process and a disassembly process of the in-tank split device for the spent fuel pool of the present invention.
Fig. 6 is a schematic view of a mounting fixture system and service replacement equipment for an in-tank split device for a spent fuel pool of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be noted that the orientation or positional relationship indicated by "upper" or the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience and simplicity of description, and is not meant to indicate or imply that the apparatus or element to be referred to must be provided with a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood by those skilled in the art in specific cases.
The invention provides an in-cell split device for a spent fuel storage pool, the in-cell split device comprising: a base fixedly installed in the spent fuel storage pool at a position near the bottom; an intermediate section removably mounted on the base; and a pump body detachably mounted on the intermediate section.
The invention also provides a maintenance and replacement system for in-tank split equipment of a spent fuel storage pool, the maintenance and replacement system comprising: the equipment maintenance replacement chamber comprises a cleaning pipeline, a purging pipeline and a sewage pipeline, wherein the sewage pipeline is positioned at the bottom of the equipment maintenance replacement chamber, the cleaning pipeline is used for providing high-pressure water flow for cleaning equipment, the purging pipeline is used for providing high-pressure air flow for enabling the equipment to be dried quickly, and the sewage pipeline is used for discharging sewage after the equipment is cleaned; and an overhaul crane for transporting components of the split equipment within the pool between the spent fuel storage pool and the equipment overhaul change room.
According to the invention, the pool water heat exchange device and the pool water ion exchange device are respectively designed into split devices, and are correspondingly arranged on the inner side wall of the spent fuel pool through the in-pool installation fixing system so as to respectively cool and purify the pool water. The split type pool water heat exchange device in the pool comprises a pump body, a middle section (i.e. a heat exchange section) and a base, and the split type pool water ion exchange device in the pool comprises the pump body, the middle section (i.e. an ion exchange purification section) and the base. The tank water heat exchange device and the tank water ion exchange device of the invention are similar in form, and are installed, overhauled and replaced in the same way, so that the tank water heat exchange device in a split form and the tank water ion exchange device in a split form are collectively called as an in-tank split device hereinafter.
Because the spent fuel assemblies in the spent fuel storage pool are radioactive and the pool water is special, special requirements and needs are placed on the fixing, maintenance and replacement of the split devices in the pool.
Firstly, in the running process of the in-tank split device, a base, a middle section and a part of a pump body of the in-tank split device need to be submerged under the water of the spent fuel storage pool, and workers cannot directly contact and operate the parts of the in-tank split device under the water of the pool, so that a detachable device of the in-tank split device needs to be arranged above the water surface of the spent fuel storage pool, and the in-tank split device is convenient to detach and reinstall;
secondly, a positioning and guiding device of the in-tank split equipment is arranged below the water of the spent fuel storage pool so as to position the in-tank split equipment at different positions, ensure that each segment of the in-tank split equipment cannot loose and fall off in the process of disassembling and reinstalling the in-tank split equipment, and ensure that each segment of the in-tank split equipment cannot horizontally shift and rotate;
finally, the installation, maintenance and replacement of the in-tank split equipment are required to have certain safety and operability, so that the installation, maintenance and replacement of the in-tank split equipment by staff are facilitated.
Example 1:
the embodiment discloses an in-cell split device for a spent fuel storage pool and an installation fixing system for the same. FIG. 1 is a front view of a spent fuel pool in accordance with the present invention after the in-pool separator apparatus is installed and secured. Fig. 2 is a side view of the spent fuel pool of the invention after the in-pool split device is installed and secured. Fig. 3 is a top view of the spent fuel pool of the invention after the in-pool split device is installed and secured.
As shown in fig. 1, 2 and 3, the in-tank split device comprises a base 1, a middle section 2 and a pump body 3. The mounting and fixing system comprises a vertical slide 6 fixedly arranged on the inner side of the tank wall 5, a diagonal support cantilever bracket 7 for supporting the base 1, a cantilever bracket 8 (comprising 821, 822 and 823) for supporting the intermediate section 2 and a cantilever bracket 8 (i.e. 83) for supporting the pump body 3.
The base 1 is secured to the side wall of the pool near the bottom in a dry condition before the spent fuel storage pool is put into service. In this embodiment, the base 1 is provided with a guiding lug 11 matched with the vertical slideway 6, and by inserting the guiding lug 11 into the vertical slideway 6, the base is slid down along the vertical slideway 6 to contact with the inclined support cantilever bracket 7, then the base 1 is fixed, and the base 1 can be fixed by means of threaded connection, welding, riveting and the like.
The intermediate section 2 has lugs 4, which lugs 4 comprise lugs 421, 422 and 423 corresponding to the cantilever holders 821, 822 and 823 of the mounting and fixing system. Furthermore, similar to the base 1, the intermediate section 2 is also provided with guide lugs 11 for cooperation with the vertical slide 6.
Preferably, according to the present embodiment, three pairs of lugs 421, 422 and 423 are distributed on the intermediate section 2 from bottom to top in the longitudinal direction, and the lugs 421 are located at the lower portion of the intermediate section 2, attached to the peripheral wall of the intermediate section 2, and extend outwardly for a certain length in the direction perpendicular to the axial direction of the intermediate section 2. A through hole is provided at the distal end of each lug 421, and a positioning pin 9 having a substantially cylindrical shape is provided at a corresponding position of the cantilever bracket 821 corresponding thereto, and when the intermediate section 2 is mounted by the cooperation of the guide lugs 11 with the vertical slide 6, the positioning pin 9 is inserted into the through hole to prevent the intermediate section 2 from being displaced and rotated in the circumferential direction. Lugs 422 are located in the middle of intermediate section 2, they are attached to the peripheral wall of intermediate section 2, and extend outwardly in a direction perpendicular to the axial direction of intermediate section 2 for a length longer than the extension length of lugs 421. A through hole is provided at the distal end of each lug 422, and a positioning pin 9 having a substantially cylindrical shape is provided at a corresponding position of the cantilever bracket 822 corresponding thereto, and the positioning pin 9 is inserted into the through hole to prevent the intermediate section 2 from being displaced and rotated in the circumferential direction when the intermediate section 2 is mounted by the cooperation of the guide lugs 11 and the vertical slide 6. The lugs 423 are located at the upper portion of the intermediate section 2, they are attached to the outer peripheral wall of the intermediate section 2, extend for a certain length in the axial direction of the intermediate section 2, and the length of the lugs 423 extending in the axial direction is required as follows: when the intermediate section 2 is fixedly mounted on the inner wall of the tank and contacts the base 1 in the axial direction, the upper ends of the lugs 423 are located above the water surface. In addition, the lugs 423 extend outward by a certain length in a direction perpendicular to the axial direction of the intermediate section 2 after extending in the axial direction of the intermediate section 2. A through hole is provided at the distal end of the horizontally extending portion of each lug 423, a stud 10 having a substantially cylindrical shape is provided at a position corresponding to the cantilever bracket 823 corresponding thereto, and when the intermediate section 2 is mounted by the engagement of the guide lug 11 with the vertical slideway 6, the stud 10 is inserted into the through hole, and then the intermediate section 2 is axially fixed by the engagement of the nut with the stud 10. The cooperation of the lugs 423 with the cantilever bracket 823 prevents both a rotation of the intermediate section 2 in the circumferential direction and a displacement in the axial direction.
Although in the present embodiment, as shown in fig. 1 to 3, lugs 421, 422, and 423 are provided in pairs, respectively, in other embodiments, the number of lugs of the intermediate section 2 may be fewer or greater, or may not be provided in pairs, as long as fixation of the intermediate section 2 in the horizontal direction and in the vertical direction can be achieved.
The pump body 3 has lugs 4, the lugs 4 comprising lugs 43 corresponding to the cantilever brackets 83 of the mounting and fixing system. Furthermore, like the base 1 and the intermediate section 2, the pump body 3 is also provided with guide lugs 11 for cooperation with the vertical slide 6.
Preferably, according to the present embodiment, a pair of lugs 43 is provided on the pump body 3. The lugs 43 are attached to the outer peripheral wall of the pump body 3 and extend outwardly for a certain length in a direction perpendicular to the axial direction of the pump body 3. The positions of the lugs 43 attached to the outer peripheral wall of the pump body 3 are: after the intermediate section 2 has been installed, the lugs 43 are located above the water surface when the pump body 3 is fixedly mounted on the tank inner wall and axially contacts the intermediate section 2. The horizontal height of lugs 43 may be the same as or different from the horizontal extension of lugs 423. A through hole is provided at the distal end of each lug 43, a stud 10 having a substantially cylindrical shape is provided at a corresponding position of the cantilever bracket 83 corresponding thereto, and when the pump body 3 is mounted by the cooperation of the guide lugs 11 and the vertical slide 6, the stud 10 is inserted into the through hole, and then the nut is engaged with the stud 10 to fix the pump body 3 in the axial direction. The engagement of the lugs 43 with the cantilever holders 83 prevents both a rotation of the pump body 3 in the circumferential direction and a displacement in the axial direction.
Although in the present embodiment, as shown in fig. 1 to 3, the lugs 43 are provided in pairs, in other embodiments, the number of lugs of the pump body 3 may be smaller or larger, or may be provided in no pairs, as long as fixation of the pump body 3 in the horizontal direction and in the vertical direction can be achieved.
Fig. 4 is a schematic view of a stud 10 and dowel 9 for a mounting and securing system for an in-tank split device for a spent fuel pool of the invention.
Preferably, in this embodiment, the positioning pin 9 and the stud 10 are substantially cylindrical, the upper parts of which are of a design with a gradually decreasing diameter. Optionally, according to fig. 4, the upper portions of the positioning pins 9 and the studs 10 are tapered in a form with a certain radian, so that no distinct dividing line is formed between the upper tapered portion and the lower cylindrical portion, and thus, when the positioning pins 9 and the studs 10 are matched with the corresponding openings of the middle section 2 and the distal end of the lugs of the pump body 3, the clamping stagnation of the middle section 2 and the pump body 3 in the installation process can be avoided and reduced, and the installation convenience is improved.
Fig. 5 is a schematic view showing an installation process and a disassembly process of the in-tank split device for the spent fuel pool of the present invention.
In the anhydrous state before the spent fuel storage pool is formally put into use, a vertical slideway 6, an inclined support cantilever bracket 7, cantilever brackets 821, 822, 823 and 83, positioning pins 9 on the cantilever brackets 821 and 822 and studs 10 on the cantilever brackets 823 and 83 are prefabricated on the pool wall 5. The base 1 is lifted by the overhauling crane 12, the guide lugs 11 of the base 1 are installed in the vertical slide ways 6, and then the base 1 is slowly slid down the vertical slide ways 6 until the base 1 contacts the inclined support cantilever bracket 7. The base 1 is then horizontally fixed to the inclined support cantilever bracket 7 by welding or other fixing means, and after the spent fuel storage pool is put into use, the base 1 does not need to be overhauled or replaced.
Then, the middle section 2 is lifted by the overhauling crane 12, the guide lugs 11 of the middle section 2 are installed in the vertical slide ways 6, and then the middle section 2 is slowly slid down along the slide ways until the middle section 2 contacts the base 1, and at this time, the positioning pins 9 on the cantilever supports 821 and 822 are respectively inserted into the through holes on the lugs 421 and 422 of the middle section 2 correspondingly. In addition, the stud 10 on the cantilever bracket 823 correspondingly passes through the through hole on the horizontal extension part of the lug 423 on the upper part of the middle section 2, and a nut can be screwed into the upper end of the stud 10 for fixing. The displacement and rotation of the intermediate section 2 in the horizontal direction is restricted by the engagement of the positioning pin 9 with the through holes of the lugs 421, 422, and the movement of the intermediate section 2 in the vertical direction is restricted by the engagement of the stud 10 on the cantilever bracket 823 with the through hole of the horizontal extension of the lug 423 and the nut. The vertical slideway 6 plays a role in guiding the guiding lugs 11 of the middle section 2, and a certain gap is reserved between the two. After the spent fuel storage pool is put into use, the horizontal extension part of the lugs 423 on the upper part of the middle section 2, the studs 10 on the cantilever bracket 823 and nuts matched with the studs are all located above the water surface of the spent fuel storage pool, and when the middle section 2 needs to be overhauled and replaced, a worker only needs to unscrew the nuts, and at the moment, the fixing of the middle section 2 in the vertical direction is released, so that the middle section 2 can be taken out of the spent fuel storage pool by lifting the middle section 2 upwards through the overhauling crane 12, and the content of the parts will be described in further detail with reference to fig. 6.
After fixing the intermediate section 2, the pump body 3 is lifted by the overhauling crane 12, the guide lugs 11 of the pump body 3 are installed in the vertical slide ways 6, then the pump body 3 is slowly slid down along the slide ways until the middle section 2 is contacted, at this time, the studs 10 on the cantilever bracket 83 correspondingly penetrate through the through holes on the lugs 43 of the pump body 3, and nuts can be screwed in at the upper ends of the studs 10 to fix. The movement of the pump body 3 in the horizontal direction as well as in the vertical direction is restricted by the cooperation of the through-holes of the stud 10 and the lugs 43 on the cantilever bracket 83 and the nuts. At this time, the split device is fixed in the vertical direction throughout the cell. The installation of the split-tank equipment is completed. After the spent fuel storage pool is put into use, the lugs 43 on the upper part of the pump body 3, the studs 10 on the cantilever bracket 83 and nuts matched with the studs are all located above the water surface of the spent fuel storage pool, and when the pump body 3 needs to be overhauled and replaced, workers only need to unscrew the nuts, and at the moment, the fixing of the pump body 3 in the vertical direction is released, so that the pump body 3 can be taken out of the spent fuel storage pool by lifting the pump body 3 upwards through the overhauling crane 12, and the content of the parts will be described in further detail with reference to fig. 6.
Fig. 6 is a schematic diagram of a mounting fixture system and service replacement system for an in-tank segment device for a spent fuel pool of the invention. As shown in fig. 6, the equipment service and replacement room 16 for the in-tank split equipment of the present invention includes a cleaning pipe 13, a purge pipe 14, and a drain pipe 15. The cleaning pipeline 13 is used for providing high-pressure water flow for cleaning equipment, the purging pipeline 14 is used for providing high-pressure air flow for enabling the equipment to be dried quickly, the sewage draining pipeline 15 is positioned at the bottom of the equipment maintenance replacement chamber 16, and sewage after cleaning the equipment can be discharged through the sewage draining pipeline 15 and enter the corresponding treatment chamber for purification treatment, so that the damage to the environment is reduced.
Next, the maintenance and replacement process of the in-tank split equipment will be described in detail with reference to fig. 6. After the spent fuel storage pool is put into use, the pool is in a full water state. According to the design of the split device in the pool, the lugs 43 on the upper part of the pump body 3, the studs 10 on the cantilever bracket 83 and the nuts matched with the lugs are all positioned above the water surface of the spent fuel storage pool, and the horizontally extending part of the lugs 423 on the upper part of the middle section 2, the studs 10 on the cantilever bracket 823 and the nuts matched with the bolts are all positioned above the water surface of the spent fuel storage pool.
When the pump body 3 of the in-tank split equipment needs to be overhauled, if overhauling does not involve underwater components, overhauling of the water part of the pump body 3 can be performed without disassembling a fixing nut of the pump body 3. When the part of the pump body 3 below the water surface is required to be overhauled or the pump body 3 is required to be replaced integrally, the fixing nut above the supporting lugs 43 of the pump body 3 is detached by a worker, and at this time, the fixing of the pump body 3 in the vertical direction is released. The pump body 3 is then lifted up along the vertical slide 6 by the service crane 12 until the pump body 3 breaks away from the vertical slide 6, at which point the pump body 3 can be removed from the spent fuel pool. The pump body 3 is lifted to the equipment maintenance replacement room 16 through the maintenance crane 12, the pump body 3 is cleaned through the cleaning pipeline 13, the cleaned pump body 3 is purged and dried through the purging pipeline 14, and then, the pump body 3 can be maintained or replaced by staff. After the maintenance is completed, the worker connects the repaired pump body 3 to the maintenance crane 12, or in the case where the pump body 3 needs to be replaced, the worker properly disposes of the cleaned discarded pump body 3 and connects the new pump body 3 to the maintenance crane 12. Finally, the repaired pump body 3 or a new pump body 3 is installed into the spent fuel pool by the installation process described above with reference to fig. 5, thereby completing the repair or replacement of the pump body 3 of the in-pool split device.
When it is necessary to perform maintenance or replacement of the intermediate section 2 of the in-tank split equipment, the pump body 3 is first disassembled and lifted to the equipment maintenance replacement room 16 by the process of disassembling the pump body described above with reference to fig. 6. Then, the fixing nut above the horizontally extending portion of the lugs 423 of the intermediate section 2 is removed by the worker, and at this time, the fixing of the intermediate section 2 in the vertical direction is released. The intermediate section 2 is then lifted up along the vertical slide 6 by the service crane 12 until the intermediate section 2 is clear of the vertical slide 6, at which point the intermediate section 2 can be removed from the spent fuel pool. The middle section 2 is lifted to the equipment maintenance replacement room 16 through the maintenance crane 12, the middle section 2 is cleaned through the cleaning pipeline 13, the cleaned middle section 2 is purged and dried through the purging pipeline 14, and then, a worker can maintain or replace the middle section 2. After the repair is completed, the staff connects the repaired intermediate section 2 to the repair hoist 12, or in case the intermediate section 2 needs to be replaced, the staff properly disposes of the cleaned discarded intermediate section 2 and connects the new intermediate section 2 to the repair hoist 12. Finally, the repaired or new middle section 2 is installed into the spent fuel pool by the installation process described above with reference to fig. 5, and the pump body 3 is installed into the spent fuel pool, thereby completing the repair or replacement of the middle section 2 of the in-pool split device.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (10)
1. An in-cell separation apparatus for a spent fuel storage pool, comprising:
the base is arranged at a position close to the bottom in the spent fuel storage pool;
an intermediate section removably mounted on the base; and
a pump body detachably mounted on the intermediate section;
the intermediate section has: a plurality of first lugs respectively arranged on the peripheral walls of the middle section at different heights,
the in-tank split device further comprises a plurality of first cantilever brackets which are respectively arranged on the wall of the spent fuel storage pool and correspond to the first lugs for supporting the first lugs,
the pump body has: at least one second support lug arranged on the outer peripheral wall of the pump body;
the in-tank split device further comprises at least one second cantilever bracket arranged on the wall of the spent fuel storage pool at a position corresponding to the second support lug for supporting the second support lug,
the far ends of the lugs of the middle section are respectively provided with a through hole, the far end of at least one lug of the pump body is respectively provided with a through hole, the far end of the cantilever bracket which is positioned below the water surface of the water tank wall is correspondingly provided with a positioning pin, the far end of the cantilever bracket which is positioned above the water surface of the water tank wall is correspondingly provided with a stud,
through the cooperation of through-hole and locating pin, restricted the displacement and the rotation of interlude in the horizontal direction, through the cooperation between through-hole and double-screw bolt and the nut with double-screw bolt complex, restricted the displacement and the rotation of interlude and the pump body in the horizontal direction, restricted the displacement of interlude and the pump body in the vertical direction simultaneously.
2. The in-cell separator device of claim 1, wherein the plurality of first lugs comprises long lugs and short lugs,
and a part of the long support lug and the cantilever bracket matched with the long support lug are positioned above the water surface of the spent fuel storage pool.
3. The in-cell separator as claimed in claim 2, wherein the bottom end of the long lugs is provided on the outer peripheral wall of the intermediate section and extends upward in the height direction of the intermediate section, and the top ends of the long lugs are higher than the top of the intermediate section,
the number of the short lugs is one or more, and the short lugs are arranged below the long lugs.
4. The in-cell separation apparatus according to claim 3, wherein,
at least one second support lug of the pump body and the at least one second cantilever bracket matched with the second support lug are positioned above the water surface of the spent fuel storage pool.
5. The in-cell separation device of claim 4, wherein a first cylindrical pin is provided on the first cantilever bracket, and a first opening matching the first cylindrical pin is provided on the first support lug;
the second cantilever bracket is provided with a second cylindrical pin, and the first support lug is provided with a second opening matched with the second cylindrical pin.
6. The in-cell separation device of claim 1, further comprising a vertical slide provided on a pool wall of the spent fuel storage pool and arranged in a vertical direction of the pool wall; and is also provided with
The pump body, the middle section and the base are all provided with: a guide lug for being matched with the vertical slideway,
and the pump body, the middle section and the base are guided to be stably installed in place through the cooperation of the guide lugs and the vertical slide ways.
7. The in-cell separation device of claim 1, wherein the base is secured to the spent fuel pool near the bottom by a diagonal cantilever mounted to the pool wall.
8. The in-tank separator apparatus according to any one of claims 1-7, wherein the in-tank separator apparatus is a tank water heat exchange apparatus, and the intermediate section is a heat exchange section; or the in-tank separation device is a tank water ion exchange device, and the middle section is an ion exchange purification section.
9. A spent fuel storage system comprising a spent fuel storage pool, further comprising the in-pool separator apparatus of any one of claims 1-8.
10. The spent fuel storage system according to claim 9, further comprising an overhaul replacement apparatus comprising:
the equipment maintenance replacement chamber comprises a cleaning pipeline, a purging pipeline and a sewage pipeline, wherein the sewage pipeline is positioned at the bottom of the equipment maintenance replacement chamber, the cleaning pipeline is used for providing high-pressure water flow for separating the components of the equipment in the tank, the purging pipeline is used for providing high-pressure air flow for quickly drying the components of the equipment in the tank, and the sewage pipeline is used for discharging sewage after cleaning the components of the equipment in the tank;
and an overhaul crane for transporting components of the split equipment within the pool between the spent fuel storage pool and the equipment overhaul change room.
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| CN202110656427.7A CN113421672B (en) | 2021-06-11 | 2021-06-11 | In-cell separation device for spent fuel storage pool and spent fuel storage system |
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| CN111824938A (en) * | 2020-07-20 | 2020-10-27 | 中国核动力研究设计院 | Spent fuel storage framework transporting and overturning device and mounting method |
| CN213231613U (en) * | 2020-08-18 | 2021-05-18 | 中国核电工程有限公司 | In-pool ion exchange device of spent fuel pool |
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| EP3485496B1 (en) * | 2016-07-15 | 2020-04-15 | TerraPower, LLC | Vertically-segmented nuclear reactor |
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| JPH06258487A (en) * | 1993-03-05 | 1994-09-16 | Central Res Inst Of Electric Power Ind | Mobile cell for liquid metal cooled fast reactor |
| EP1069393A1 (en) * | 1999-07-15 | 2001-01-17 | Tada Denki K.K. | Heat exchange apparatus for cooling water |
| CN108766605A (en) * | 2018-05-22 | 2018-11-06 | 广东核电合营有限公司 | Screen work localization method in million kilowatt nuclear power factory Spent Fuel Pool |
| CN111540494A (en) * | 2020-05-28 | 2020-08-14 | 中核环保产业有限公司 | Dedicated operation platform equipment suitable for spent fuel dry method storage |
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| CN113421672A (en) | 2021-09-21 |
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