Anti-seismic and heat-insulating mechanism for control rod driving mechanism

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By designing a seismic insulation mechanism in the control rod driving mechanism, and using the combined structure of the seismic plate and the heat insulation plate, the impact of high-temperature air on the top cable and the mechanism deformation problems are solved, and the earthquake and heat insulation effect is achieved, reducing the construction and operation cost of the nuclear power plant.

CN223078871UActive Publication Date: 2025-07-08CHINA NUCLEAR POWER DESIGN COMPANY +1

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Patent Information

Application Number: CN202422158709.6
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-09-03
Publication Date: 2025-07-08
Estimated Expiration: 2034-09-03

AI Technical Summary

Technical Problem

In a pressurized water reactor nuclear power plant, the hot air generated by the control rod driving mechanism in a high temperature environment affects the performance and life of the cable in the top area of the reactor. At the same time, the deformation of the mechanism causes structural instability under earthquake conditions, which is difficult to effectively solve the problem of the existing technology.

Method used

A seismic insulation mechanism is designed, including a seismic plate and a heat insulation plate, connected by fasteners or bonds, forming a combined structure without a through-channel, blocking and dividing high-temperature air, limiting deformation of the mechanism, and using thermal insulation materials and metal materials to achieve seismic and thermal insulation functions.

Benefits of technology

Simplified the stack top structure, save space, reduce construction and operation costs, ensure mechanism integrity and cable safety, and prevent high-temperature air from affecting the stack top cable.

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Abstract

The utility model discloses an anti-seismic heat insulation mechanism for a control rod driving mechanism, which comprises a plurality of anti-seismic heat insulation assemblies, each rod position detector is correspondingly connected with one anti-seismic heat insulation assembly, the anti-seismic heat insulation assemblies are arranged in parallel and level, and each anti-seismic heat insulation assembly comprises a heat insulation plate and an anti-seismic plate. The anti-seismic and heat-insulating mechanism for the control rod driving mechanism has anti-seismic and heat-insulating functions, is beneficial to simplifying the complexity of a reactor top structure item, is convenient to arrange and install, saves the reactor top space, and reduces the construction and operation cost of a power station. And the anti-seismic heat insulation assembly is used for limiting the transverse displacement and deformation of the stroke sleeve under the earthquake working condition, so that the integrity of the pressure boundary of the control rod driving mechanism and the smoothness of a rod falling channel of the driving rod component are ensured. Meanwhile, the anti-seismic heat insulation assembly can prevent and shunt high-temperature air generated by cooling of the control rod driving mechanism from flowing to the upper part of the reactor top, so that the influence of the high-temperature air on the reactor top cable is reduced, and the safety of the cable is improved.

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Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature control rod drive mechanisms for pressurized water nuclear power plants, and particularly relates to an earthquake-resistant and heat-insulating mechanism for a control rod drive mechanism. Background Art

[0002] In a pressurized water reactor nuclear power plant, the control rod drive mechanism is vertically installed on the reactor pressure vessel head. When the control rod drive mechanism operates, due to the heat dissipation of the high-temperature primary coolant and the heat generated when the coil components of the drive mechanism are energized, it is necessary to dissipate heat from the coil components of the drive mechanism. Currently, a forced cooling ventilation device is generally used to cool down the coil components.

[0003] The pressure-bearing housing of the control rod drive mechanism is of a slender structure. Under seismic conditions, the drive mechanism will sway and produce large deformations, which is not conducive to the performance and structural integrity of the drive mechanism. In order to simplify the reactor head structure, integrated reactor head systems are being developed both at home and abroad by improving the temperature resistance level of the CRDM coil itself and canceling the forced cooling ventilation device on the reactor head. After the control rod drive mechanism adopts natural ventilation cooling, the air will flow upward after being heated, and the air temperature in the top area of the reactor head will increase significantly, which may affect the performance and service life of heat-sensitive items such as cables in the top area of the reactor head. How to reasonably reduce the influence of high-temperature hot air on the top area of the reactor head is also a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an earthquake-resistant and heat-insulating mechanism for a control rod drive mechanism.

[0005] The technical solution adopted by the utility model to solve its technical problem is to construct an earthquake-resistant and heat-insulating mechanism for a control rod drive mechanism. The control rod drive mechanism includes a plurality of rod position detectors, and the earthquake-resistant and heat-insulating mechanism includes a plurality of earthquake-resistant and heat-insulating components. Each of the rod position detectors is correspondingly connected to one of the earthquake-resistant and heat-insulating components, and the earthquake-resistant and heat-insulating components are arranged flush with each other.

[0006] Each of the earthquake-resistant and heat-insulating components includes an earthquake-resistant plate installed at the top end of the rod position detector and a heat-insulating plate connected to the earthquake-resistant plate.

[0007] In some embodiments, there is a first predetermined gap between each adjacent earthquake-resistant plate, and there is a second predetermined gap between each adjacent heat-insulating plate.

[0008] In some embodiments, the second predetermined gap is greater than the first predetermined gap.

[0009] In some embodiments, the gaps between the seismic plates and the gaps between the heat insulation plates are staggered so that the overall formed by multiple seismic and heat insulation components does not have a through-channel.

[0010] In some embodiments, the heat insulation plate is made of a heat insulating material.

[0011] In some embodiments, the seismic plate is made of a metal material.

[0012] In some embodiments, the seismic plate and the heat insulation plate are connected by fasteners.

[0013] In some embodiments, the seismic plate and the heat insulation plate are connected by adhesion.

[0014] In some embodiments, a first through-hole is formed in the seismic plate.

[0015] In some embodiments, a second through-hole corresponding to the first through-hole is formed in the heat insulation plate.

[0016] Implementing the present utility model has the following beneficial effects: The seismic and heat insulation mechanism for the control rod drive mechanism has both seismic and heat insulation functions, which helps to simplify the complexity of the items on the reactor top structure, facilitates layout and installation, saves the reactor top space, and reduces the construction and operation costs of the power station. Moreover, the seismic and heat insulation components are used to limit the lateral displacement and deformation of the travel sleeve under seismic conditions, ensuring the integrity of the pressure boundary of the control rod drive mechanism and the smoothness of the falling rod channel of the drive rod component. At the same time, the seismic and heat insulation components can block and divert the high-temperature air generated by the cooling of the control rod drive mechanism from flowing upward to the upper part of the reactor top, reducing the impact of the high-temperature air on the reactor top cables and improving the safety of the cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present utility model, the present utility model will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts. In the drawings:

[0018] Figure 1 is a schematic diagram of the overall structure of the seismic and heat insulation mechanism for the control rod drive mechanism in some embodiments of the present utility model;

[0019] Figure 2 is a schematic diagram of the structure of the seismic and heat insulation component in some embodiments of the present utility model;

[0020] Figure 3 is a sectional view of the structure of the seismic and heat insulation component in some embodiments of the present utility model. Detailed implementation manners

[0021] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the detailed implementation manners of the present utility model will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the accompanying drawings and are constructed and operated in a specific orientation. This is only for the convenience of describing the technical solution and does not indicate that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0022] It should also be noted that unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. When an element is referred to as being "above" or "below" another element, the element can be "directly" or "indirectly" located above the other element, or there may also be one or more intermediate elements provided. The terms "first", "second", "third", etc. are only for the convenience of describing the technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. can explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] Please refer to Figures 1 to 3 , which is an earthquake-resistant and heat-insulating mechanism for a control rod drive mechanism in some embodiments of the present utility model. The control rod drive mechanism includes a plurality of rod position detectors 1, and the earthquake-resistant and heat-insulating mechanism includes a plurality of earthquake-resistant and heat-insulating components 2. Each rod position detector 1 is correspondingly connected to an earthquake-resistant and heat-insulating component 2. The earthquake-resistant and heat-insulating components 2 are arranged flush with each other. Each earthquake-resistant and heat-insulating component 2 includes an earthquake-resistant plate 22 installed at the top of the rod position detector 1 and a heat-insulating plate 21 connected to the earthquake-resistant plate 22. Among them, the earthquake-resistant and heat-insulating component 2 is specifically located between the upper part of the rod position detector 1 and the area below the cable joint, is installed at the top of the rod position detector 1, and is clamped and fixed to the travel sleeve on the rod position detector 1.

[0024] Understandably, the seismic and heat insulation component 2 is applicable to the natural heat cooling ventilation at the top of the nuclear power plant reactor. The seismic and heat insulation mechanism for the control rod drive mechanism is formed by assembling several independent seismic and heat insulation components 2, and each seismic and heat insulation component 2 corresponds to a rod position detector 1. Each seismic and heat insulation component 2 consists of an upper and a lower layer structure. The upper seismic plate 22 plays a role in fixed installation and seismic resistance, and can prevent the travel sleeve from generating excessive lateral displacement and deformation under seismic conditions. The lower heat insulation plate 21 is used to block and divert the upward flow of high-temperature air formed by the natural heat ventilation of the control rod drive mechanism into the top cable area of the reactor.

[0025] In addition, there is a first predetermined gap between each adjacent seismic plate 22, which facilitates installation and avoids extrusion and stress between the seismic plates 22 under normal conditions. There is a second predetermined gap between each adjacent heat insulation plate 21. A gap is also set between adjacent heat insulation plates 21, which facilitates installation and avoids extrusion and stress between the heat insulation plates 21 under normal conditions. And the second predetermined gap is greater than the first predetermined gap, which can ensure that when the adjacent rod position detectors 1 swing and displace under seismic conditions, the upper seismic plate 22 will come into contact first, avoiding damage to the heat insulation plate 21. The seismic and heat insulation component 2 has multiple functions such as seismic resistance, hot air blocking and diversion, etc., to be applicable to the natural ventilation cooling and heat dissipation of the control rod drive mechanism, and to facilitate the operation and maintenance of the integrated reactor top system. Among them, the relative size between the heat insulation plate 21 and the seismic plate 22 is not limited. The specification size of the heat insulation plate 21 can be larger or smaller than that of the seismic plate 22, as long as the above-mentioned second predetermined gap is greater than the first predetermined gap to ensure that the seismic plate 22 touches first.

[0026] Furthermore, the gaps between the seismic plates 22 and the gaps between the heat insulation plates 21 are arranged staggeredly, so that the overall formed by multiple seismic and heat insulation components 2 does not have a through-channel. Understandably, the gaps between the upper seismic plates 22 and the gaps between the lower heat insulation plates 21 are staggered from each other. The gaps between the seismic plates 22 can be covered by the heat insulation plates 21, and the gaps between the heat insulation plates 21 can be covered by the seismic plates 22. In this way, the overall formed by multiple seismic and heat insulation components 2 will not form a through-channel, which can block the high-temperature air from flowing to the top area through the gaps, realize the blocking and diversion of the high-temperature air flow formed by natural ventilation, and ensure that the temperature of the cable layout area above the seismic plate 22 is relatively low.

[0027] The heat insulation plate 21 is made of heat-insulating materials such as glass fiber, asbestos, rock wool, silicate, etc. The seismic plate 22 is made of metal material, and the metal material is preferably stainless steel. In addition, the thickness of the seismic plate 22 should ensure that it can be fixedly connected to the rod position detector 1, and the seismic plate 22 does not undergo stress deformation after being squeezed under seismic conditions. The thickness of the lower heat insulation plate 21 should ensure the required heat insulation effect.

[0028] Among them, the seismic insulation plate 22 and the heat insulation plate 21 can be connected by fasteners, and the fasteners can be bolts. Or the seismic insulation plate 22 and the heat insulation plate 21 are connected by bonding.

[0029] Among them, a first through hole 221 is formed in the seismic insulation plate 22, and a second through hole 211 corresponding to the first through hole 221 is formed in the heat insulation plate 21. The first through hole 221 and the second through hole 211 are for the rod position connector of the rod position detector 1 to pass through.

[0030] Generally speaking, the seismic and heat insulation assembly 2 is adapted to a new type of reactor top structure that uses a control rod drive mechanism with high temperature resistance and self-heat cooling ventilation, which helps to simplify the complexity of the reactor top structure items, facilitate layout and installation, save reactor top space, and reduce the construction and operation costs of the power station. And the seismic and heat insulation assembly 2 is used to limit the lateral displacement and deformation of the travel sleeve under seismic conditions, ensure the integrity of the pressure boundary of the control rod drive mechanism and the smoothness of the falling rod channel of the drive rod component. At the same time, the seismic and heat insulation assembly 2 can block and divert the high-temperature air generated by the cooling of the control rod drive mechanism from flowing upward to the top of the reactor, reduce the impact of the high-temperature air on the reactor top cable, and improve the safety of the cable.

[0031] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation to the scope of the patent of the present invention; it should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention; therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. An anti-seismic and heat-insulating mechanism for a control rod drive mechanism, the control rod drive mechanism comprising a plurality of rod position detectors (1), characterized in that, The earthquake-resistant and heat-insulating mechanism includes a plurality of earthquake-resistant and heat-insulating components (2). Each of the rod position detectors (1) is correspondingly connected to one of the earthquake-resistant and heat-insulating components (2), and each of the earthquake-resistant and heat-insulating components (2) is arranged flush with each other. Each of the earthquake-resistant and heat-insulating components (2) includes an earthquake-resistant plate (22) installed at the top of the rod position detector (1) and a heat-insulating plate (21) connected to the earthquake-resistant plate (22).

2. The anti-seismic and heat-insulating mechanism for a control rod drive mechanism according to claim 1, characterized in that, There is a first predetermined gap between each adjacent pair of the earthquake-resistant plates (22), and there is a second predetermined gap between each adjacent pair of the heat-insulating plates (21).

3. The seismic insulation mechanism for a control rod drive mechanism according to claim 2, characterized in that, The second predetermined gap is larger than the first predetermined gap.

4. The seismic insulation mechanism for a control rod drive mechanism according to claim 1, characterized in that, The gaps between the earthquake-resistant plates (22) and the gaps between the heat-insulating plates (21) are arranged staggeredly so that the overall formed by the plurality of earthquake-resistant and heat-insulating components (2) does not have a through-channel.

5. The seismic insulation mechanism for a control rod drive mechanism according to claim 1, characterized in that, The heat-insulating plate (21) is made of heat-insulating material.

6. The seismic insulation mechanism for a control rod drive mechanism according to claim 1, characterized in that, The earthquake-resistant plate (22) is made of metal material.

7. The seismic insulation mechanism for a control rod drive mechanism according to claim 1, characterized in that, The earthquake-resistant plate (22) and the heat-insulating plate (21) are connected by fasteners.

8. The seismic insulation mechanism for a control rod drive mechanism according to claim 1, characterized in that, The earthquake-resistant plate (22) and the heat-insulating plate (21) are connected by bonding.

9. The seismic insulation mechanism for a control rod drive mechanism according to claim 1, characterized in that, A first through-hole (221) is formed in the earthquake-resistant plate (22).

10. The seismic insulation mechanism for a control rod drive mechanism according to claim 9, characterized in that, A second through-hole (211) corresponding to the first through-hole (221) is formed in the heat-insulating plate (21).