JP2019082368A - Fireproof wall system for equipment in nuclear power plant - Google Patents

Abstract

To provide a fireproof wall system for equipment in a nuclear power plant capable of improving an inspection property and/or a maintainability of equipment which needs periodical inspection and/or maintenance of object equipment to be fire-protected in a nuclear power plant.SOLUTION: A fireproof wall system partly comprises an inspection window 3 and/or a door 4 applied with refractory material having fireproof performance equivalent to that of refractory material constituting the fireproof wall system.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fire wall system for nuclear power plant equipment.

  It is required that nuclear power plants conform to the “Evaluation standards for fire protection of nuclear power reactors and their affiliated facilities” which were put into effect in July 2013. According to this regulatory standard, fire protection measures are implemented in consideration of fire occurrence prevention, fire detection and extinction, and fire influence mitigation, and nuclear reactors installed in the fire area or fire compartment in the reactor facility. There is a need to protect structures, systems and equipment with safety features related to hot and cold shutdowns from fire.

  Among them, as one of the main measures to reduce the effects of fire, structures, systems and devices with safety functions related to high temperature shutdown and low temperature shutdown of the reactor (fire protection target equipment such as motorized valves and fire protection target equipment Fire protection cable with a fire resistance of at least 3 hours, if the fire protection cable (cable or other cable to drive or control) is installed in the fire area of a different safety system classification, the fire protection cable or fire protection Measures to separate target devices are required. And, even after a fire for 3 hours, it is required to maintain the function of the fire protection target cable and the fire protection target equipment.

  For example, Patent Document 1 proposes a fireproof structure of a cable in a nuclear power plant to meet such a standard.

JP, 2015-171176, A

  The fireproof structure of the cable in the nuclear power plant described in Patent Document 1 can protect a fire protection target cable from a fire. And conventionally, as described in patent document 1, what is examined about a fireproof structure from the viewpoint of fire protection only is mostly.

  By the way, some fire protection target devices require periodic maintenance. As described above, conventionally, since the fireproof structure (fireproof wall system) has been studied from the viewpoint of fire protection only, the conventional fireproof structure dismantles the fireproof structure and performs maintenance of the equipment at the time of maintenance of the equipment. It is structured based on the idea of doing In addition, it is better to periodically perform a simple inspection such as visual inspection, and to perform maintenance on the basis of the result, but the conventional fireproof structure takes into consideration the simple inspection of the equipment. Not. As described above, conventionally, including Patent Document 1, inspection (especially simple inspection) of fire protection target equipment located inside the fireproof structure and internal access at the time of maintenance are not considered.

  An object of the present invention is to provide a fireproof wall system of nuclear power plant equipment capable of improving the checkability and / or maintainability of equipment requiring periodic inspection and / or maintenance on fire protection equipment. It is in.

  In order to solve the above problems, the present invention provides a part of the fireproof wall system with a window and / or a door provided with a fireproof material having fire resistance equivalent to that of the fireproof material constituting the fireproof wall system. It features.

According to the fireproof wall system of the nuclear power plant equipment of the present invention, it is possible to improve the checkability and / or the maintainability of the equipment which needs periodic inspection and / or maintenance in the fire protection object equipment.
Problems, structures, and effects other than those described above will be clarified by the following description of the embodiments.

It is a general view of the fireproof wall system of one example of the present invention. It is sectional drawing of an example of the fireproof wall inspection window part in the Example shown in FIG. It is a front view of another example of the fireproof wall inspection window part in the Example shown in FIG. It is sectional drawing of another example of the fireproof wall inspection window part in the Example shown in FIG. It is a figure which shows an example of the fireproof wall door part in the Example shown in FIG. 1, (A) is a front view, It is a (B) right side view. It is an exploded view at the time of apparatus maintenance of the fireproof wall system of the example shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of a fireproof wall system (fireproof structure) according to an embodiment of the present invention.
The fireproof wall system of the nuclear power plant equipment is equipment that may affect the high temperature shutdown or the low temperature shutdown of the nuclear reactor (valves, devices for driving the same, etc. Hereinafter, it is referred to as "fire protection target equipment"). ) Is a fire wall system built around fire protected equipment so that it can be kept functional even after a fire of 3 hours.

  The fireproof wall system comprises a floor, a wall and a ceiling with fireproof walls, and is provided so as to cover the periphery of the fire protection target device so that the fire protection target device is located inside. In the fireproof wall system of the present embodiment, the fireproof material 5 is wound around the fireproof wall frame 1 as a framework provided so as to cover the periphery of the fire protection target equipment so that the fire protection target equipment can be protected from fire. It is a thing.

  In the present embodiment, the frame members constituting the fireproof wall frame 1 are bolted in the disassembled frame bolt fastening portion 2 in order to make the frame easier to disassemble (details will be described later). The refractory material 5 has a fire resistance capable of withstanding a three hour fire. For example, a combination of an endothermic material and a heat insulating material as described in JP-A-2016-65360 is used, and it may be configured as a multilayer structure as described in Patent Document 1. In FIG. 1, only a part (a part of the side surface) of the refractory material 5 is illustrated. In addition, the code | symbol 6 is a wall which has the required fireproof capability isolate | separated from an adjacent fire area or fire area. The refractory wall system of the present embodiment is also constructed using the wall 6.

  The conventional fireproof wall system is one in which the fireproof material 5 is simply wound around the fireproof wall frame 1. For this reason, conventionally, when performing maintenance of fire protection target equipment, it is necessary to disassemble the fireproof structure, and it is necessary to build up the fireproof wall system again after the maintenance. Therefore, when there is equipment requiring periodic maintenance among fire protection target equipment, the maintenance is extremely bad.

  Therefore, the present invention is made on the basis of a new idea that inspection and maintenance of a fire protection target device can be performed while maintaining a fire resistant structure (fire resistance). In other words, the fireproof wall system of the present invention is a fireproof structure considering maintenance, and has fire resistance and maintainability. A specific configuration example of a fireproof wall system having fire resistance and maintainability will be described below.

  Among the fire protection target devices, for example, it is better to periodically perform a simple check such as a visual check and to perform maintenance based on the result. As shown in FIG. 1, the fireproof wall system of the present embodiment is provided with a check window 3 for simply checking the fire protection target equipment inside the fireproof wall system.

  A configuration example of the inspection window 3 is shown in FIG. FIG. 2 is a cross-sectional view of the inspection window (fireproof wall inspection window). In the refractory wall system, the punching metal 9 is provided on the inner side, and the refractory material 7 is provided on the outer side of the refractory structure of the punching metal 9 in a multilayer structure. The punching metal 9 is provided with a punching metal removing portion 10 which becomes an inspection window 3. On the outer side of the fireproof structure of the punching metal removal portion 10, a fireproof material 8 is detachably provided in a multilayer structure. The multi-layered fire resistant material 8 is configured such that the attachment / detachment portion has a step-like shape, and the multi-layered fire resistant material 7 is also formed as a multi-layered refractory It is configured to contact the material 7 in a step-like manner.). The multi-layered refractory material 8 is configured to have fire resistance equivalent to that of the multi-layered refractory material 7. For example, it is assumed that the same material has the same thickness.

  When performing a simple inspection of the fire protection target device, remove the multi-layered fireproof material 8 sequentially, remove the punching metal removal part 10, and carry out a simple check of the fire protection target device inside the fireproof wall system. After completion of the simple inspection, the punching metal removal portion 10 is attached, and the multi-layered refractory material 8 is sequentially attached. In addition, you may integrate and comprise the refractory material 8 of a multilayer structure.

  According to the present embodiment, since the inspection window provided with the fireproofing material having the fireproof performance equivalent to the fireproofing material constituting the fireproofing wall system is provided in a part of the fireproofing wall system, the fire resistance is not impaired. Regular inspection and maintenance of the equipment to be protected become extremely easy. Further, in the present embodiment, it is possible to prevent the linear heat input from the outside to the inside of the fireproof structure at the time of a fire by making the shape of the detachable portion of the fireproof material 8 of the multilayer structure stepwise. Can be better maintained.

  The fireproof wall system of the present embodiment is provided with the inspection window 3 for simply inspecting the fire protection target device inside the fireproof wall system, as in the first embodiment. FIG. 3A is a front view of the inspection window (refractory wall inspection window) of the present embodiment, and FIG. 3B is a cross-sectional view of the inspection window (refractory wall inspection window) of the present embodiment.

  In the inspection window of the present embodiment, the fireproof material 15 having fireproof performance equivalent to that of the fireproof material 14 can be attached to and detached from the inspection window part of the fireproof material 14 constituting the fireproof wall system. Refractory material 15 is integrated by sheet metal 12 and frame 16 for an inspection window, and sheet metal 12 has an inspection window handle 13 attached. After attaching the refractory 14 to the inspection window, it is firmly attached to the refractory structure by the buckle 11.

  Also in this embodiment, the fire protection system is not damaged because fire resistance is not added to a part of the fire protection wall system, since the inspection window provided with a fire protection material having fire resistance equivalent to that of the fire protection material constituting the fire protection wall system is provided. Regular inspection and maintenance of the target equipment will be extremely easy. Further, in the present embodiment, since the fireproof material 15 integrated with the sheet metal 12 to which the inspection window handle 13 is attached is attached to and detached from the fireproof structure, opening and closing of the inspection window (refractory wall inspection window portion) It becomes easy, and simple inspection becomes easier.

  The fireproof wall system of the present embodiment is, as shown in FIG. 1, provided with a door 4 for facilitating access to fire protection target equipment inside the fireproof wall system.

  A configuration example of the door 4 is shown in FIG. FIG. 4A is a front view of the fireproof wall door portion. Drawing 4 (B) is a right side view of an example of a fireproof wall door part.

  A refractory 22 is attached to the door body 21. The refractory material 22 has the same fire resistance as the refractory material 17 constituting the fire resistant structure. The door main body 21 is provided with a door handle 23. The fireproof material (door handle part fireproof material removal part 18) of the location of the door handle is comprised so that attachment or detachment is possible. The door handle refractory portion removal portion 18 can prevent the linear heat input to the inside of the fireproof structure at the time of a fire by setting the shape of the detachable portion in a step-like manner as in the first embodiment. In addition, the upper part of the door is covered with a fireproof material (door upper refractory covering part 19), and the lower part of the door is covered with a fireproof material (door lower refractory covering part 20) respectively. To prevent heat input. The door upper refractory covering portion 19 and the door lower refractory covering portion 20 are attached to the fireproof wall frame 1 by the pins 24. The pins 24 are provided so as not to penetrate the outside of the refractory structure.

  According to this embodiment, since a door provided with a fireproofing material having fire resistance equivalent to that of the fireproofing material constituting the fireproofing wall system is provided in a part of the fireproofing wall system, the fireproofing wall is not damaged. Access to fire protected equipment inside the system can be facilitated. Further, in the present embodiment, it is configured to prevent a linear heat input to the inside of the fireproof structure at the time of a fire, and fire resistance can be further maintained.

  As shown in FIG. 1, the frame members constituting the fireproof wall structure 1 of the fireproof wall system of the present embodiment are bolted at a disassembly frame bolt fastening portion 2 in order to facilitate disassembling the frame. This is to secure a work space for the work equipment when work equipment such as a chain block is required for maintenance of the fire protection equipment. Conventionally, the frame members are connected by welding, and therefore, when maintaining the fire protection target device, disassembly such as cutting the frame members is required. That is, conventionally, disassembly of the fireproof wall system at the time of maintenance is not considered.

  In this embodiment, the fireproof wall frame 1 which is a framework of the fireproof structure is configured to be divisible, and each connecting portion is bolted. If work equipment such as a chain block is required for maintenance of the fire protection target equipment, remove the fireproof material, remove the bolt at the disassembly frame bolt fastening part 2, and remove part of the structure members to secure the work space Do. This state is shown in FIG. In FIG. 5, the upper part of the frame member is removed.

  After maintenance of the fire protection target equipment is completed, reattach the removed frame members with bolts and reattach the refractory.

  According to this embodiment, maintenance becomes easier, and reconstruction of the fireproof wall system after maintenance is also easy. Moreover, reuse of the frame member of a fireproof wall frame is also possible.

  The present invention is not limited to the embodiments described above, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, it is possible to add, delete, and replace other configurations for part of the configurations of the respective embodiments.

  DESCRIPTION OF SYMBOLS 1 ... Fireproof wall frame, 2 ... Decomposition frame bolt fastening part, 3 ... Inspection window, 4 ... Door, 5 ... Refractory material, 6 ... Wall, 7 ... Refractory material, 8 ... Refractory material, 9 ... Punching metal, 10 ... Punching Metal removal part, 11 ... Buckle, 12 ... Sheet metal, 13 ... Inspection window handle, 14 ... Refractory material, 15 ... Refractory material, 16 ... Frame for inspection window, 17 ... Refractory material, 18 ... Door handle part Refractory material removal part, DESCRIPTION OF SYMBOLS 19 ... Door upper refractory material covering part, 20 ... Door lower refractory material covering part, 21 ... Door main body, 22 ... Refractory material, 23 ... Door handle, 24 ... Pin.

Claims (4)

A fireproof wall system for nuclear power plant equipment in which fire protection target equipment is located,
A fireproof wall for nuclear power plant equipment characterized in that a part of the fireproof wall system is provided with a check window and / or a door provided with a fireproof material having the same fireproof performance as the fireproof material constituting the fireproof wall system. system. In the fire wall system of nuclear power plant equipment according to claim 1,
The fireproof wall system for nuclear power plant equipment, wherein the fireproof material constituting the inspection window is a fireproof material having a multilayer structure, and is configured to contact stepwise with the fireproof material of the fireproof wall system. . In the fire wall system of nuclear power plant equipment according to claim 1,
A refractory wall system for nuclear power plant equipment, characterized in that a refractory material of a covering structure is attached to upper and lower portions of the door so as to prevent a linear heat input from the outside to the inside of the refractory wall system. In the refractory wall system for nuclear power plant equipment according to any one of claims 1 to 3,
The fireproof wall system is composed of a fireproof wall frame as a framework and the fireproof material attached to the fireproof wall frame, and the fireproof wall system is configured by fastening a plurality of frame members by bolts. Firepower wall system for nuclear power plant equipment.

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