Offshore nuclear power platform containment equipment transfer system and method

Abstract

The invention provides an offshore nuclear power platform containment equipment transfer system and method.The offshore nuclear power platform containment equipment transfer system comprises a shielding silo, a platform temporary workshop, a shore-based crane and a shore-based maintenance workshop, the shielding silo is arranged at a shielding door at the top of a containment and used for hoisting and shielding equipment to be maintained, and the platform temporary workshop is arranged on a platform deck and used for hoisting and shielding the equipment to be maintained; according to the invention, receiving, hoisting and transferring facilities are provided, it is ensured that the equipment to be maintained is effectively contained in the containment and the shielding silo, multi-line parallel operation can be realized, and the equipment maintenance out-of-cabin process has higher efficiency, safety and reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore nuclear power platforms, and particularly relates to a transfer system and method for the containment equipment of an offshore nuclear power platform. Background Art

[0002] After the nuclear-related equipment (pump sets, valves, pipe sections, etc.) or their components in the containment of an offshore nuclear power platform have been in long-term operation, their functions may decline or be damaged due to factors such as service life, operating environment, and operation and use. When it is necessary to continue to maintain the system's functional performance, replacement or repair is often required. For the systems and equipment on the offshore nuclear power platform that are not nuclear-related, they can usually be repaired or replaced in place or directly hoisted out of the cabin. However, nuclear-related maintenance activities need to consider radioactive material containment, radioactive waste generation, radiation protection, etc., because once a leak occurs, it will cause radioactive hazards to the crew and the environment, resulting in immeasurable losses. In addition, offshore nuclear power platforms are different from land-based nuclear power plants, and the resource space of nuclear power plants is relatively abundant. Therefore, nuclear-related maintenance of offshore nuclear power platforms will be a high-risk technical problem faced by the industry.

[0003] Currently, for the common nuclear-related equipment hoisting and transfer facilities to shore-based facilities in various countries in the world, it is usually necessary to set up local temporary nuclear-related maintenance channels, which mainly include hoisting facilities, transfer facilities, and local shielding, negative pressure ventilation, radiation monitoring, etc. for the hoisting and transfer channels. Building local temporary nuclear-related maintenance channels will occupy a large amount of maintenance space, involve many cabins on the platform or ship, and the temporary channels will be filled with radioactive substances. It is very difficult to achieve parallel operation of nuclear-related equipment, reducing the hoisting and transfer efficiency, with a relatively high risk of radioactive substances spilling out of the channel, numerous auxiliary equipment, a large involved project, and a large amount of radioactive substances generated after the maintenance activities are completed, and it is difficult to reuse the maintenance channels. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a transfer system and method for the containment equipment of an offshore nuclear power platform, which can achieve flexible hoisting and transfer through a shielding silo and improve the hoisting and transfer efficiency in view of the above problems.

[0005] The embodiments of the present application are implemented as follows: The embodiments of the present application provide a transfer system for the containment equipment of an offshore nuclear power platform, which is characterized by including a shielding silo, a platform temporary workroom, a shore-based crane, and a shore-based maintenance workshop. The shielding silo is placed at the shielding door on the top of the containment to perform hoisting shielding on the equipment to be repaired. The platform temporary workroom is arranged on the platform deck to provide temporary transition for the shielding silo. The shore-based crane hoists the shielding silo into the shore-based maintenance workshop.

[0006] In some alternative embodiments, the shield silo includes a silo body and a silo body hoisting device. The silo body hoisting device is installed at the top of the silo body. An inlet door is provided at the bottom of the silo body, and an outlet door is provided on the side wall of the silo body.

[0007] In some alternative embodiments, a traveling crane is provided at the top of the temporary platform workshop, and a flatbed transporter is provided on the platform deck. The traveling crane hoists the shield silo onto the flatbed transporter, and the flatbed transporter transports the shield silo outside the temporary platform workshop.

[0008] In some alternative embodiments, openings are provided on each layer of the platform structure between the temporary platform workshop and the top shield door of the containment, forming a hoisting channel for the shield silo.

[0009] In some alternative embodiments, the silo body hoisting device includes a hoisting machine, a hoisting rope, and a gripper. The hoisting machine is installed at the top of the silo body and is connected to the gripper through the hoisting rope to grip the equipment to be repaired.

[0010] A method for using a transfer system for containment equipment of an offshore nuclear power platform is characterized by comprising the following steps: Step a: According to the layout inside the containment and the situation of the top opening, transfer in advance the required number of shield silos to the vicinity of the top space of the offshore nuclear power platform containment. Step b: The shield silo is placed on the shield door, and the equipment to be repaired is hoisted by the silo body hoisting device until it enters the shield silo, and then the inlet door and the shield door are closed. Step c: The traveling crane in the temporary platform workshop hoists the shield silo containing the equipment to be repaired into the temporary platform workshop and moves it onto the flatbed rail car. Step d: After the shield silo is hoisted onto the platform deck, it is moved out of the temporary platform workshop, and the shield silo is hoisted to the shore base by a shore-based crane and finally transferred to the shore-based maintenance workshop. The nuclear-related equipment is removed from the shield silo through the silo door and processed in the shore-based nuclear-related maintenance workshop.

[0011] The beneficial effects of the present application are as follows: 1. A transfer system and method for the containment equipment of an offshore nuclear power platform provided by the present application provides a local containment shielding silo, which is convenient for deployment, flexible in use, safe and reliable. Nuclear-related equipment can enter and exit through the bottom or side of the shielding silo, and radioactive substances can be contained through the self-shielding of the shielding silo; 2. The shielding silo can be flexibly hoisted and transferred between the top of the containment and the platform deck, avoiding the traditional hoisting channel leading to the ship platform deck, which can greatly reduce the channel length and reduce the configuration of channel shielding materials, radiation monitoring points, negative pressure ventilation auxiliary equipment, etc.; 3. By reasonably arranging the procedures for nuclear-related equipment to leave the cabin, the hoisting process for leaving the cabin, the transfer process, etc., relying on the shielding silo, parallel and efficient operations of nuclear-related equipment leaving the cabin, hoisting and transferring can be achieved, improving the hoisting and transfer efficiency; 4. Radioactivity is always controlled within the containment and the shielding silo, without affecting the hoisting and transfer work processes of equipment in other compartments of the offshore nuclear power platform, providing strong support for shortening the overall class repair cycle time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a schematic structural diagram of the transfer system of the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. The components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0016] It should be understood that the magnitudes of the sequence numbers of the steps in the embodiments do not mean the order of execution. The execution order of each process should be determined by its function and internal logic and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0017] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further definition and explanation thereof is not required in subsequent figures.

[0018] In addition, terms such as "horizontal", "vertical", "hanging", etc. do not require the components to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0019] The orientation or positional relationship indicated by terms such as "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, terms such as "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0020] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0021] The features and performance of the present application will be further described in detail below in conjunction with embodiments.

[0022] Embodiment 1 As Figure 1 shown, in this embodiment, a transfer system for the containment equipment of an offshore nuclear power platform is disclosed, which includes a shielding silo 1, a platform temporary workroom 2, a shore-based crane 3, and a shore-based maintenance workshop 4. The shielding silo is placed at the shielding door 6 on the top of the containment 5 to hoist and shield the equipment to be repaired 7. The platform temporary workroom is arranged on the platform deck 8 to provide a temporary transition for the shielding silo. The shore-based crane hoists the shielding silo into the shore-based maintenance workshop. In the shore-based maintenance workshop, processes such as radioactive decontamination, inspection and repair, and commissioning remeasurement are carried out on the equipment to be repaired. After the treatment, the equipment meets the conditions for being hoisted into the containment of the offshore nuclear power platform.

[0023] The shielded silo includes a silo body and a silo body hoisting device. The silo body hoisting device is installed at the top of the silo body. An inlet door is provided at the bottom of the silo body, and an outlet door is provided on the side wall of the silo body. The shielded silo is the smallest unit for storing equipment to be repaired, and the equipment to be repaired can be inclusively stored and transported through the inlet door and the outlet door.

[0024] A traveling crane 9 is provided at the top of the temporary platform workroom, and a flatbed transporter 10 is provided on the platform deck. The traveling crane hoists the shielded silo onto the flatbed transporter, and the flatbed transporter transports the shielded silo outside the temporary platform workroom.

[0025] Openings are provided on each layer of the platform structure between the temporary platform workroom and the top shield door of the containment, forming a hoisting channel for the shielded silo to facilitate the linear hoisting of the shielded silo.

[0026] Embodiment 2 In this embodiment, the silo body hoisting device includes a hoisting machine, a hoisting rope, and a gripper. The hoisting machine is installed at the top of the silo body and is connected to the gripper through the hoisting rope to grab the equipment to be repaired.

[0027] The above transfer system is applicable to situations where equipment inside the containment (such as pump sets, valves, pipe sections, etc.) needs to be taken out of the cabin during class repairs, emergency repairs, etc. The typical working process can be decomposed into three steps: The first step is the hoisting working process of nuclear-related equipment inside the containment, the second step is the hoisting working process on the platform after the nuclear-related equipment exits the containment, and the third step is the hoisting working process of the nuclear-related equipment from the platform to the onshore hoisting. Specifically as follows: (1) Hoisting working process of equipment to be repaired inside the containment According to the layout inside the containment and the situation of the top opening, transfer the required number of shielded silos to the vicinity of the top space of the offshore nuclear power platform containment in advance. A temporary shield door is built on the top opening of the containment. The temporary shield door can be opened and closed. Opening provides a channel for hoisting, and closing realizes the radioactive containment of the containment. The shielded silo is located on the temporary shield door. The gripper at the front end of the hoisting rope of the built-in hoisting machine in the shielded silo moves downward to fix the nuclear-related equipment that needs to be taken out of the cabin for repair or maintenance inside the containment, and then by retracting the hoisting rope, the nuclear-related equipment is gradually lifted into the shielded silo. Subsequently, the inlet door at the bottom of the shielded silo is closed, and the temporary shield door is also closed, realizing the containment of the nuclear-related equipment in the shielded silo and the containment of radioactive substances inside the containment.

[0028] (2) Hoisting working process on the platform after the nuclear-related equipment exits the containment After the nuclear-related equipment passes through the shielding silo out of the containment, the openings of the platform structures from the top of the containment to the platform deck provide a channel for the shielding silo to be hoisted. A temporary platform workshop is built on the platform deck of the offshore nuclear power platform. The shielding silo containing the nuclear-related equipment is hoisted to the temporary platform workshop by the crane on the top of the temporary platform workshop and moved to the flatbed rail car. After the shielding silo is hoisted, the hoisting process of the nuclear-related equipment in the containment can be repeated, and the hoisting work of the next nuclear-related equipment in the containment can be carried out in parallel.

[0029] (3) Workflow of nuclear equipment installation from platform to shore After the shielding silo is hoisted to the platform deck, it is moved out of the temporary workshop of the platform and hoisted to the shore by a shore-based crane, and finally transferred to the shore-based maintenance plant. The nuclear-related equipment is moved out of the shielding silo through the exit door and undergoes radioactive decontamination, inspection and maintenance, commissioning and retesting in the shore-based maintenance plant. After the processing is completed, the conditions for hoisting back into the containment of the offshore nuclear power platform are met.

Claims

1. A transfer system for the containment equipment of an offshore nuclear power platform, characterized in that, It includes a shielding silo, a temporary platform workshop, a shore-based crane and a shore-based maintenance workshop. The shielding silo is placed at the shielding door on the top of the containment vessel to carry out lifting and shielding for the equipment to be repaired. The temporary platform workshop is arranged on the platform deck to make a temporary transition for the shielding silo. The shore-based crane hoists the shielding silo into the shore-based maintenance workshop.

2. The transfer system for the containment equipment of an offshore nuclear power platform according to claim 1, wherein, The shielding silo includes a silo body and a silo body hoisting device. The silo body hoisting device is installed at the top of the silo body. An access door is provided at the bottom of the silo body, and an exit door is provided on the side wall of the silo body.

3. The transfer system for the containment equipment of an offshore nuclear power platform according to claim 2, wherein, A traveling crane is provided at the top of the temporary platform workshop, and a flatbed transporter is provided on the platform deck. The traveling crane hoists the shielding silo onto the flatbed transporter, and the flatbed transporter transports the shielding silo out of the temporary platform workshop.

4. The transfer system for the containment equipment of an offshore nuclear power platform according to claim 3, characterized in that, Openings are provided on the platform structures of each layer between the temporary platform workshop and the shielding door on the top of the containment vessel to form a hoisting channel for the shielding silo.

5. The transfer system for the containment equipment of an offshore nuclear power platform according to claim 2 or 5, characterized in that, The silo body hoisting device includes a hoisting machine, a hoisting rope and a gripper. The hoisting machine is installed at the top of the silo body and is connected to the gripper through the hoisting rope to grab the equipment to be repaired.

6. A method for using a transfer system for a containment device of an offshore nuclear power platform according to claim 4 above, characterized in that, It includes the following steps: Step a: According to the layout inside the containment vessel and the situation of the top opening, transfer in advance the required number of shielding silos to the vicinity of the top space of the offshore nuclear power platform containment vessel. Step b: The shielding silo is seated on the shielding door, and the equipment to be repaired is lifted by the silo body hoisting device until it enters the shielding silo, and then the access door and the shielding door are closed. Step c: The traveling crane in the temporary platform workshop hoists the shielding silo containing the equipment to be repaired into the temporary platform workshop and moves it onto the flatbed rail car. Step d: After the shielding silo is hoisted onto the platform deck, it is moved out of the temporary platform workshop. The shore-based crane hoists the shielding silo to the shore and finally transfers it to the shore-based maintenance workshop. The nuclear-related equipment is removed from the shielding silo through the silo door and is processed in the shore-based nuclear-related maintenance workshop.

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