CN217061463U - Reactor pressure vessel overhauls technology apron - Google Patents
Reactor pressure vessel overhauls technology apron Download PDFInfo
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- CN217061463U CN217061463U CN202123013595.9U CN202123013595U CN217061463U CN 217061463 U CN217061463 U CN 217061463U CN 202123013595 U CN202123013595 U CN 202123013595U CN 217061463 U CN217061463 U CN 217061463U
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Abstract
The utility model belongs to the technical field of nuclear power station reactor overhauls, concretely relates to reactor pressure vessel overhauls technology apron, distribute and each item parameter according to the field equipment, damaging current equipment not, do not influence under the prerequisite that each item overhauls the task and normally develop, develop reactor pressure vessel and overhaul technology apron, carry out the shutoff to open reactor pressure vessel, can supply the staff current, improve the flexibility of staff's activity, work efficiency has been promoted, eliminate problem and the potential safety hazard that work develops the in-process, effectively prevent the multiplexer utensil of operation in-process, consumptive material etc. fall into reactor pressure vessel, play the good foreign matter function of preventing.
Description
Technical Field
The application belongs to the technical field of nuclear power station reactor maintenance, and particularly relates to a reactor pressure vessel maintenance process cover plate.
Background
The reactor pressure vessel is an important component of the reactor, and is a primary coolant pressure boundary and a third barrier to prevent fission product escape, for containing internals, core components (such as fuel assemblies, control rod assemblies, and burnable poison assemblies), and other associated components (such as instrumentation, etc.). The reactor pressure vessel is typically formed by welding seven major portions together with a vessel flange at the uppermost end. The container flange is integrally forged, and 54 bolt holes are uniformly distributed in the end face of the flange and used for mounting main bolts. The flange end face is also provided with 2 concentric V-shaped sealing grooves for placing a main sealing face nickel gasket. The flange sealing surface of the reactor pressure vessel is attached to the flange sealing surface of the upper assembly under the action of the main bolts and the main nuts, and the nickel gasket in the V-shaped sealing groove is compressed, so that the sealing between the reactor pressure vessel and the upper assembly is realized. A boss is processed on the upper portion of the inner surface of the container flange, 12 keys are arranged on the upper portion of the boss, and the keys are matched with 12 key grooves of the reactor core basket flange, so that the upper portion of the reactor core basket is placed on and fixed on the boss of the container flange.
During the unit refueling overhaul and disassembly overhaul, after the core unloading operation is finished, a series of operations are performed on (or near) a reactor pressure vessel flange, such as residual primary loop medium cleaning, pressure vessel main bolt hole cleaning and lubricating, pressure vessel main sealing surface and V-shaped sealing groove cleaning and dimension measuring, pressure vessel main sealing surface nickel gasket trial installation and dimension measuring, pressure vessel main sealing surface levelness measuring, hanging basket position measuring in a pressure vessel and the like. During the execution of the above work, a large number of workers, special and general-purpose tools, spare parts, consumables, etc. are introduced near the reactor pressure vessel. The operation of workers near the opening of the reactor pressure vessel is edge operation, and great industrial safety risks are caused.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a reactor pressure vessel maintenance process cover plate, which solves the problem that in the prior art, a series of work is executed on (or near) a reactor pressure vessel flange, so that great industrial safety risks exist.
The technical scheme for realizing the purpose of the application is as follows:
the embodiment of the application provides a reactor pressure vessel overhauls technology apron, overhaul technology apron includes: the cover plate panel, the connecting assembly and the two guide posts;
the cover plate panel is disc-shaped, has a diameter larger than the inner diameter of a flange of the reactor pressure vessel and is used for plugging an opening of the reactor pressure vessel;
the connecting components are fixed at the edge of the cover plate panel, correspond to the guide posts one by one and are used for connecting the cover plate panel and the guide posts;
and the guide columns are used for ensuring the coaxiality of the cover plate panel and the reactor pressure vessel.
In the alternative,
and the two guide columns are symmetrically arranged in two main bolt holes on the flange of the reactor pressure vessel.
Alternatively to this, the first and second parts may,
the lower part of the guide post is a guide sleeve, and external threads matched with the internal threads of the main bolt hole are distributed on the outer surface of the guide sleeve.
Alternatively to this, the first and second parts may,
the upper end of the guide post is conical.
In the alternative,
and the top of the guide column is provided with an eyebolt for hoisting the guide column.
Optionally, the connection assembly includes: a guide block;
one end of the guide block is provided with an arc-shaped notch matched with the guide post;
the other end of the guide block is fixed with the edge of the cover plate panel.
Optionally, the connecting assembly further includes: a guide block supporting plate and a guide block fixing plate;
the guide block supporting plate is welded at the edge of the cover plate panel, and the guide block fixing plate is connected with the guide supporting plate through a fastening bolt and a single-lug stop washer;
the other end of the guide block is connected with the guide block fixing plate.
Alternatively to this, the first and second parts may,
the other end of the guide block is connected with the guide block fixing plate through a fixed pin shaft, so that the guide block rotates by taking the fixed pin shaft as an axis.
Optionally, the connecting assembly further includes: positioning pins;
and the positioning pin is used for fixing one end of the guide block at a position extending out of the cover plate panel.
Alternatively to this, the first and second parts may,
the positioning pin is connected with the fastening bolt through an anti-falling rope.
Alternatively to this, the first and second parts may,
and a preformed hole of the material changing monitoring system is formed in the cover plate panel and used for installing the material changing monitoring system.
In the alternative,
be provided with detachable shutoff board on the monitoring system preformed hole that reloads for prevent that the foreign matter from following the monitoring system preformed hole that reloads falls into reactor pressure vessel's inside.
Alternatively to this, the first and second parts may,
and the cover plate panel is provided with an access hole for observing the water level change in the reactor pressure vessel and implementing the measurement and maintenance work related to the pressure vessel and the reactor core basket.
In the alternative,
and the access hole is provided with an openable and closable access hole cover plate for preventing foreign matters from falling into the reactor pressure vessel from the access hole.
In the alternative,
one end of the access hole cover plate is connected with the upper surface of the cover plate panel through a connecting piece, and the access hole cover plate can rotate around the connecting piece to be opened and closed;
and a handle is arranged at the other end of the access hole cover plate.
In the alternative,
and a protective gasket which is contacted with the reactor pressure vessel is arranged on the lower surface of the cover plate panel.
Alternatively to this, the first and second parts may,
at least one transverse reinforcing rib plate and/or at least one longitudinal reinforcing rib plate are welded on the lower surface of the cover plate panel;
the length of the transverse reinforcing rib plate and the length of the longitudinal reinforcing rib plate are smaller than the inner diameter of the reactor pressure vessel flange.
Alternatively to this, the first and second parts may,
the diameter of the cover plate panel is smaller than that of the V-shaped groove of the inner ring of the reactor pressure vessel.
Alternatively to this, the first and second parts may,
and the upper surface of the cover plate panel is provided with a lifting lug.
The beneficial technical effect of this application lies in:
(1) the embodiment of the application provides a reactor pressure vessel overhauling process cover plate, which is developed according to field equipment distribution and various parameters on the premise of not damaging the existing equipment and not influencing the normal development of various overhauling tasks, and the opened reactor pressure vessel is plugged, so that workers can pass through the cover plate, the flexibility of the activities of the workers is improved, the working efficiency is improved, the problems and the potential safety hazards in the process of working development are eliminated, tools, consumables and the like in the operation process are effectively prevented from falling into the reactor pressure vessel, and a good foreign matter prevention function is achieved;
(2) the embodiment of the application provides a maintenance process cover plate for a reactor pressure vessel, which avoids the introduction of an easy-to-loosen part or a connection form as much as possible in structural design, and the individual unavoidable easy-to-loosen part is protected by adopting a stainless steel wire rope connection or a check gasket;
(3) the embodiment of the application provides a maintenance process cover plate for a reactor pressure vessel, wherein a guide post is skillfully arranged in a main bolt hole of the pressure vessel and matched with a guide block on the maintenance process cover plate for the reactor pressure vessel, so that the coaxiality of the installation of the process cover plate is ensured, and the process cover plate is prevented from radial or axial displacement in the using process;
(4) the embodiment of the application provides a reactor pressure vessel maintenance process cover plate, wherein a protective gasket is added at a contact part of the protective gasket and a sealing surface of a reactor pressure vessel, so that the sealing surface of the reactor pressure vessel is effectively protected from being damaged;
(5) the embodiment of the application provides a reactor pressure vessel maintenance process cover plate, wherein a circular flat plate structure is adopted for a reactor pressure vessel maintenance process cover plate panel, a transverse reinforcing rib plate and a longitudinal reinforcing rib plate are arranged at the lower part of the reactor pressure vessel maintenance process cover plate panel for reinforcement, conditions are created for radiation shielding measures of the reactor pressure vessel in terms of structural strength, the environmental dose rate is effectively reduced, the collective dose value of workers is reduced, and positive contribution is made for achieving the radiation dose optimization target;
(6) the embodiment of the application provides a reactor pressure vessel overhauls technology apron, and the guide post upper end adopts the toper design, can guarantee that the guide block meshes with the guide post fast, reduces the centering time when reactor pressure vessel overhauls technology apron installation.
Drawings
FIG. 1 is a front view of a reactor pressure vessel access process head plate provided in an embodiment of the present application;
FIG. 2 is a top view of a reactor pressure vessel access process cover plate according to an embodiment of the present disclosure;
fig. 3 is a schematic view illustrating installation and use of a reactor pressure vessel maintenance process cover plate according to an embodiment of the present application.
In the figure:
1-a cover panel; 11-reserving holes for a refueling monitoring system; 12-plugging plate; 13-manhole; 14-manhole cover plate; 15-a connector; 16-a handle; 17-a protective gasket; 18-transverse reinforcing rib plates;
19-longitudinal reinforcing rib plates; 10-lifting lugs;
2-a connecting assembly; 21-a guide block; 22-an arc-shaped notch; 23-a guide block support plate; 24-guide block fixing plate; 25-fastening bolts; 26-fixing a pin shaft; 27-a locating pin; 28-preventing dropping of the rope;
3, a guide post; 31-a guide sleeve; 32-eye bolts;
4-reactor pressure vessel main bolt hole; 5-lifting the hanger; 6-reactor pressure vessel flange.
Detailed Description
In order to make the technical solutions in the embodiments of the present application more clearly understood and fully described below by those skilled in the art, the technical solutions in the embodiments of the present application will be described with reference to the drawings in the embodiments of the present application. It should be apparent that the embodiments described below are only some of the embodiments of the present application, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments described herein without inventive step, are within the scope of the present application.
The inventor of the application discovers in research that at present, no special process cover plate is designed on the unit maintenance process design to plug the opening of the reactor pressure vessel, and the pressure vessel is completely in an open state. The development of the above-mentioned series of maintenance activities in such a field state entails the following practical problems or risks: (1) the operation of workers near the opening of the reactor pressure vessel is edge operation, so that great industrial safety risk is realized; (2) a great deal of special and general tools and spare parts are brought to the vicinity of the open reactor pressure vessel to cause great risk of foreign matters entering a primary circuit; (3) the main sealing surface of the reactor is continuously in an exposed state, and a larger risk of accidental damage of the main sealing surface exists during various maintenance activities nearby the reactor; (4) the open reactor pressure vessel is not conducive to the implementation of radiation shielding measures, limits the flexibility of activities of workers, reduces the work efficiency, cannot effectively control the collective dose, and is not conducive to the realization of the radiation dose optimization goal.
In order to solve the multi-aspect practical problems and hidden dangers brought by the fact that a special process cover plate is not designed on the unit maintenance process design to seal an opening of a reactor pressure vessel, eliminate industrial safety risks and risks of foreign matters entering a loop during maintenance work carried out on (or nearby) a flange of the reactor pressure vessel, reduce the risk of accidental damage to a main sealing surface of the reactor pressure vessel, improve the flexibility of movement of workers so as to improve the working efficiency, create conditions for implementing radiation shielding measures on the working position of the reactor pressure vessel, reduce the overhaul collective dose and achieve the goal of optimizing the radiation dose, the embodiment of the application provides the maintenance process cover plate of the reactor pressure vessel, temporarily seals the opening of the reactor pressure vessel, and eliminates industrial safety risks and risks of foreign matters entering the loop during maintenance work carried out on (or nearby) the flange of the reactor pressure vessel, the risk of accidental damage to the main sealing surface of the reactor pressure vessel is reduced, the flexibility of movement of workers is improved, so that the working efficiency is improved, meanwhile, conditions are created for radiation shielding measures to be implemented at the working position of the reactor pressure vessel, the overhaul collective dose is reduced, and the radiation dose optimization target is realized.
The inventor of the application considers the influence and interference factors on other related maintenance work by analyzing the structural size of the reactor pressure vessel and the distribution condition of field equipment, and finds that the following technical problems need to be solved when the cover plate is designed and developed for the maintenance process of the reactor pressure vessel: (1) the process cover plate is simple and reliable in structure, and the bearing safety coefficient meets the actual field requirement; (2) the process cover plate is convenient and quick to install, has high coaxiality with a reactor pressure vessel, is stable after being placed, and is not easy to generate radial or circumferential displacement; (3) the contact part of the process cover plate and the sealing surface of the reactor pressure vessel is required to adopt effective measures to protect the sealing surface of the pressure vessel from being damaged; (4) the structural design of the process cover plate is preset with an overhaul or observation window for related overhaul work; (5) all parts on the process cover plate should adopt reliable anti-loosening measures to prevent foreign matters from falling into the pressure container.
Therefore, the inventor of the application adopts the following technical scheme on the design of the maintenance process cover plate of the reactor pressure vessel so as to solve the problems: (1) the technical cover plate adopts a cover plate panel with a circular flat plate structure, the lower surface of the cover plate panel is reinforced by a transverse reinforcing rib plate and a longitudinal reinforcing rib plate, and the bearing safety coefficient meets the actual field requirement; (2) a guide post is arranged on a main bolt hole of the pressure container and matched with a guide block on the cover plate panel, so that the coaxiality of the cover plate panel is ensured; (3) a protective gasket is added at the contact part of the cover plate panel and the sealing surface of the reactor pressure vessel to protect the sealing surface of the pressure vessel from being damaged; (4) designing a manhole at a position of the cover plate panel corresponding to the implementation position of related maintenance work of the pressure vessel and plugging the manhole by a hole cover; (5) the process cover plate structure design avoids the introduction of easy-to-loosen parts or connection forms as much as possible, and the individual inevitable easy-to-loose parts are protected by adopting stainless steel wire rope connection or anti-loose gaskets.
Based on the above, in order to clearly and specifically explain the above advantages of the present application, the following description of the embodiments of the present application will be made with reference to the accompanying drawings.
Referring to fig. 1, the drawing is a front view of a reactor pressure vessel access process cover plate provided by an embodiment of the present application.
The embodiment of this application provides a reactor pressure vessel overhauls technology apron includes: the device comprises a cover plate panel 1, a connecting assembly 2 and two guide posts 3;
the cover plate panel 1 is disc-shaped, has a diameter larger than the inner diameter of a flange of the reactor pressure vessel and is used for plugging an opening of the reactor pressure vessel;
the connecting components 2 are fixed at the edge of the cover plate panel 1, correspond to the guide posts 3 one by one and are used for connecting the cover plate panel 1 and the guide posts 3;
and the guide columns 3 are used for ensuring the coaxiality of the cover plate panel and the reactor pressure vessel, realizing that the process cover plate is accurately and stably located on the flange surface of the reactor pressure vessel, and finishing the temporary plugging of the pressure vessel.
It can be understood that the cover plate panel 1 is a core component of a reactor pressure vessel maintenance process cover plate provided by the embodiment of the application, and is used for temporarily blocking an opening of a pressure vessel. In practical application, the panel can also be used as a load-bearing panel of a personnel passing and radiation protection shielding lead skin.
In specific implementation, in order to reduce the environmental dose rate and reduce the collective dose value of workers, lead shielding can be paved on the upper surface of the cover plate panel 1 for radiation protection.
In some possible implementations of the embodiments of the present application, the diameter of the cover plate panel 1 is smaller than the diameter of the "V" groove of the inner ring of the reactor pressure vessel.
It should be noted that the diameter of the cover plate panel 1 is larger than the inner diameter of the reactor pressure vessel flange, but smaller than the diameter of the "V" groove of the inner ring, so that the cover plate panel 1 can be supported on the pressure vessel flange without covering the "V" groove of the pressure vessel flange, and the measurement work of the size of the "V" groove of the pressure vessel flange is not interfered.
In some possible implementations of the embodiment of the present application, as shown in fig. 2, the connection assembly 2 includes: a guide block 21;
one end of the guide block 21 is provided with an arc-shaped notch 22 matched with the guide post 3;
the other end of the guide block 21 is fixed to the edge of the cover panel 1.
In one example, the connection assembly 2 further includes: a guide block support plate 23 and a guide block fixing plate 24;
a guide block support plate 23 is welded to the edge of the cover plate 1, and a guide block fixing plate 24 is connected to the guide support plate 23 by a fastening bolt 25 and a one-ear lock washer (not shown in the drawings);
the other end of the guide block 21 is connected to a guide block fixing plate 24.
It can be understood that strict compliance with the foreign matter prevention management regulations of the power station can effectively prevent the fastening bolt 25 from loosening by adopting the single-lug stop washer, and prevent the parts of the equipment from becoming foreign matters and falling into the reactor pressure vessel.
In another example, the other end of the guide block 21 is connected to the guide block fixing plate 24 by a fixing pin 26 so that the guide block 21 rotates about the fixing pin 26.
As an example, the guide block 21 can be rotated within 90 ° by fixing the pin 26 as an axis, so that there are two working states: when the guide block 21 is in the vertical position shown in fig. 2, the guide block is in a transportation working state, and the cover plate panel 1 can be hoisted and transported at the moment; the guide 21 is in the horizontal position shown in fig. 2 in an installation mode in which the cover plate 1 can be installed on the flange of the reactor pressure vessel.
In practical applications, the connecting assembly 2 may further include: positioning pins 27;
and a positioning pin 27 for fixing one end of the guide block 21 at a position (e.g., a horizontal position in fig. 2) protruding out of the cover panel 1, and ensuring that the guide block 21 is not turned over during the guide function.
It should be noted that, since the positioning pin 27 is a movable component, in order to prevent it from falling down and becoming a foreign object, in practical implementation, the positioning pin 27 may also be connected with the fastening bolt 25 through the falling-preventing rope 28.
In one example, the anti-fall cord 28 may be specifically a stainless steel cord.
It will be appreciated that the guide posts 3 are parts of the auxiliary deck plate 1 which are mounted to the flange face of the reactor pressure vessel to ensure the concentricity of the deck plate 1 with the reactor pressure vessel. In one specific example, two guide posts 3 are symmetrically arranged in two main bolt holes on a flange of a reactor pressure vessel, and the centering reference of the process cover plate is established by skillfully using field existing equipment.
In some possible implementation manners of the embodiment of the present application, the lower portion of the guide post 3 is a guide sleeve 31, and external threads matched with the internal threads of the main bolt hole are distributed on the outer surface of the guide sleeve 31, so as to install and fix the guide post 3 in the main bolt hole.
The guide post 3 is used as a centering reference for installing the cover plate panel 1, in one example, the upper end of the guide post 3 is conical, and the conical design can ensure that the guide block 21 is quickly connected with the guide post 3, so that the centering time of a crane is reduced.
In another example, the top of the guide post 3 is provided with an eye bolt 32 for hoisting the guide post 3.
In some possible implementation manners of the embodiment of the present application, as shown in fig. 2, a preformed hole 11 of a refueling monitoring system is provided on the cover plate panel 1 for installing the refueling monitoring system.
As an example, the refuelling monitoring system pre-determined hole 11 may be 4.
In one example, the refueling monitoring system preformed hole 11 is provided with a removable blanking plate 12 for preventing foreign objects from falling into the interior of the reactor pressure vessel from the refueling monitoring system preformed hole 11.
In practical applications, the plugging plate 12 may be a circular mesh plate, and during a period when the refueling monitoring system is not installed, the circular mesh plate (i.e., the plugging plate 12) is used for plugging, so that foreign matters can be prevented from falling into the reactor pressure vessel.
In some possible implementations of the embodiment of the present application, as shown in fig. 2, the cover plate panel 1 is provided with a service hole 13 for observing the water level change in the reactor pressure vessel and performing measurement and service work related to the pressure vessel and the core barrel.
In practical applications, the access holes 13 may be provided at the edge of the cover panel 1, and specifically may be 6.
In one example, the manhole 13 is provided with a manhole cover 14 that is opened and closed to prevent foreign materials from falling into the interior of the reactor pressure vessel from the manhole 11.
In another example, one end of the manhole cover 14 is connected to the upper surface of the cover panel 1 through a connection member 15, and the manhole cover 14 is rotatable about the connection member 15 to be opened and closed;
the other end of the manhole cover 14 is provided with a handle 16.
It will be appreciated that the access panel 14 is opened and closed about the swivel connection 15 by means of a handle 16 welded thereto.
In some possible implementations of the embodiments of the present application, as shown in fig. 1, the lower surface of the deck plate 1 is mounted with a protective gasket 17 that contacts the reactor pressure vessel.
As an example, the protection gasket 17 is an annular pad made of non-metallic light material, adhered to the edge of the lower surface of the cover plate 1, and used as a contact part of the cover plate 1 and the sealing surface of the reactor pressure vessel, so as to effectively protect the sealing surface of the pressure vessel from being damaged.
In some possible implementation manners of the embodiment of the present application, as shown in fig. 1, at least one transverse reinforcing rib 18 and/or at least one longitudinal reinforcing rib 19 are welded to the lower surface of the cover plate panel 1;
the length of the transverse reinforcing rib plate 18 and the longitudinal reinforcing rib plate 19 is smaller than the inner diameter of the reactor pressure vessel flange.
It should be noted that, the transverse reinforcing rib plates 18 and the longitudinal reinforcing rib plates 19 are welded on the lower surface of the cover plate panel 1, which not only can enhance the structural strength of the whole cover plate panel 1, but also can effectively limit the cover plate panel 1 from generating radial or axial displacement.
In some possible implementations of the embodiment of the present application, as shown in fig. 1 and 2, the upper surface of the cover panel 1 is provided with a lifting lug 10.
During specific implementation, the number of the lifting lugs 10 can be 4, and the 4 lifting lugs 10 are uniformly distributed in the middle of the cover plate panel 1 and used for hoisting and transporting the cover plate panel 1.
The following describes in detail a method for installing and using a reactor pressure vessel maintenance process cover provided in an embodiment of the present application, with reference to a specific example.
Referring to fig. 3, an installation and use method of a reactor pressure vessel maintenance process cover provided in the embodiment of the present application is specifically as follows:
step 1: the outer surfaces of the two guide posts 3 are inspected and cleaned, the external threads of the guide sleeve 31 are cleaned, and a lubricant is smeared. The guide post 3 is hung above a specified reactor pressure vessel main bolt hole 4 by using a cantilever crane and centered, and the guide post 3 is slowly dropped until the threads contact each other and stop. Rotating the guide post 3 clockwise to the bottom, and simultaneously dropping the hook head of the crane to complete the installation of the guide post 3;
and 2, step: and (3) inspecting and cleaning the outer surface of the cover plate panel 1, inspecting whether the connecting parts are loosened or not, and inspecting whether the rotating parts move normally. Connecting three lifting hooks at the lower end of a lifting appliance 5 with three lifting lugs 10 on a cover plate panel 1 respectively, and connecting a lifting ring at the upper end of the lifting appliance 5 to a ring lifting hook;
and step 3: the two guide blocks 21 are placed in the installation work state (i.e. in the horizontal position shown in fig. 2), and the guide blocks 21 are locked in this position by the positioning pins 27;
and 4, step 4: hoisting the cover plate panel 1 and moving the cover plate panel to the upper part of the reactor pressure vessel, adjusting the axis to be consistent with the axis of the reactor pressure vessel and carrying out primary centering;
and 5: slowly lowering the cover plate panel 1 to the guide block 21 through the conical structure on the upper part of the guide post 3, entering the vertical surface of the guide post 3, continuously slowly lowering the cover plate panel 1 until the cover plate panel lightly falls on the reactor pressure vessel flange 6, and releasing the lifting appliance 5;
step 6: the guide post 3 is removed by means of a cantilever crane, the positioning pin 27 is pulled out, and the guide block 21 is placed in a transport working state (i.e. in the vertical position shown in fig. 2) to avoid interfering with the development of subsequent maintenance work. In order to reduce the environmental dose rate and the collective dose value of workers, lead shielding can be laid on the upper surface of the cover plate panel 1 for radiation protection;
and 7: after all the maintenance work is finished, removing the lead shield, checking and cleaning the surface of the cover plate panel 1, connecting the lifting appliance 5, and lifting the cover plate panel 1 out of the reactor vertical shaft.
The embodiment of the application provides a reactor pressure vessel overhauls technology lid, solve not design special technology apron in the unit maintenance technology design and carry out many-sided actual problem and hidden danger that the shutoff brought to reactor pressure vessel opening, eliminate the industrial safety risk and the risk that the foreign matter got into a return circuit of carrying out maintenance work duration on (or near) reactor pressure vessel flange, reduce the unexpected damage risk of reactor pressure vessel main seal face, thereby improve staff's flexibility of activity and improve work efficiency, and simultaneously, implement the radiation shielding measure for reactor pressure vessel operating position and create the condition, reduce the overhaul collective dose, realize radiation dose optimization target. The maintenance process cover for the reactor pressure vessel provided by the embodiment of the application can be popularized and applied in related work of units of the same type.
Utilize the maintenance work that the reactor pressure vessel overhauls technology lid that this application embodiment provided can popularize to other similar equipment in power station.
The reactor pressure vessel maintenance process cover provided by the embodiment of the application also has good reference significance for maintenance work of other similar equipment in the same industry.
The present application has been described in detail with reference to the drawings and examples, but the present application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. The prior art can be used for all the matters not described in detail in this application.
Claims (19)
1. A process cover plate for overhauling a reactor pressure vessel is characterized by comprising: the cover plate panel, the connecting assembly and the two guide posts;
the cover plate panel is disc-shaped, has a diameter larger than the inner diameter of a flange of the reactor pressure vessel and is used for plugging an opening of the reactor pressure vessel;
the connecting components are fixed at the edge of the cover plate panel, correspond to the guide posts one by one and are used for connecting the cover plate panel and the guide posts;
and the guide columns are used for ensuring the coaxiality of the cover plate panel and the reactor pressure vessel.
2. The reactor pressure vessel service process deck of claim 1,
and the two guide columns are symmetrically arranged in two main bolt holes on the flange of the reactor pressure vessel.
3. The reactor pressure vessel access process head plate of claim 2,
the lower part of the guide post is a guide sleeve, and external threads matched with the internal threads of the main bolt hole are distributed on the outer surface of the guide sleeve.
4. The reactor pressure vessel service process deck of claim 2,
the upper end of the guide post is conical.
5. The reactor pressure vessel service process deck of claim 2,
and the top of the guide column is provided with an eyebolt for hoisting the guide column.
6. The reactor pressure vessel service process deck as recited in any one of claims 1-5, wherein the connection assembly comprises: a guide block;
one end of the guide block is provided with an arc-shaped notch matched with the guide post;
the other end of the guide block is fixed with the edge of the cover plate panel.
7. The reactor pressure vessel service process deck of claim 6, wherein the connection assembly further comprises: a guide block supporting plate and a guide block fixing plate;
the guide block supporting plate is welded at the edge of the cover plate panel, and the guide block fixing plate is connected with the guide block supporting plate through a fastening bolt and a single-lug stop washer;
the other end of the guide block is connected with the guide block fixing plate.
8. The reactor pressure vessel service process deck of claim 7,
the other end of the guide block is connected with the guide block fixing plate through a fixed pin shaft, so that the guide block rotates by taking the fixed pin shaft as an axis.
9. The reactor pressure vessel service process deck of claim 8, wherein the connection assembly further comprises: positioning pins;
and the positioning pin is used for fixing one end of the guide block at a position extending out of the cover plate panel.
10. The reactor pressure vessel access process head plate of claim 9,
the positioning pin is connected with the fastening bolt through an anti-falling rope.
11. The reactor pressure vessel access process head plate of any of claims 1-5,
and a preformed hole of the material changing monitoring system is formed in the cover plate panel and used for installing the material changing monitoring system.
12. The reactor pressure vessel access process head plate of claim 11,
be provided with detachable shutoff board on the monitoring system preformed hole of reloading for prevent that the foreign matter from following the monitoring system preformed hole of reloading falls into reactor pressure vessel's inside.
13. The reactor pressure vessel access process head plate of any of claims 1-5,
and the cover plate panel is provided with an access hole for observing the water level change in the reactor pressure vessel and implementing the measurement and maintenance work related to the pressure vessel and the reactor core hanging basket.
14. The reactor pressure vessel access process head plate of claim 13,
and the access hole is provided with an openable and closable access hole cover plate for preventing foreign matters from falling into the reactor pressure vessel from the access hole.
15. The reactor pressure vessel access process head plate of claim 14,
one end of the access hole cover plate is connected with the upper surface of the cover plate panel through a connecting piece, and the access hole cover plate can rotate around the connecting piece to be opened and closed;
and a handle is arranged at the other end of the access hole cover plate.
16. The reactor pressure vessel access process head plate of any of claims 1-5,
and a protective gasket which is contacted with the reactor pressure vessel is arranged on the lower surface of the cover plate panel.
17. The reactor pressure vessel access process head plate of any of claims 1-5,
the lower surface of the cover plate panel is welded with at least one transverse reinforcing rib plate and/or at least one longitudinal reinforcing rib plate;
the lengths of the transverse reinforcing rib plates and the longitudinal reinforcing rib plates are smaller than the inner diameter of the reactor pressure vessel flange.
18. The reactor pressure vessel access process head plate of any of claims 1-5,
the diameter of the cover plate panel is smaller than that of the V-shaped groove of the inner ring of the reactor pressure vessel.
19. The reactor pressure vessel service process deck as recited in any one of claims 1-5,
and the upper surface of the cover plate panel is provided with a lifting lug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123013595.9U CN217061463U (en) | 2021-12-03 | 2021-12-03 | Reactor pressure vessel overhauls technology apron |
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| Application Number | Priority Date | Filing Date | Title |
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