JP6034735B2 - Filter vent building - Google Patents

Description

  The present invention relates to a filter vent building in which a filter vent device of a nuclear power plant is installed.

  Until now, domestic nuclear power plants have not been equipped with a filter vent device, but based on the lessons learned from the accident at the Fukushima nuclear power plant, it is being considered to install a filter vent device in an existing plant.

  In the event of a severe accident such as loss of all power at a nuclear power plant, the inside of the containment vessel may be pressurized. The filter vent device is a device that removes / reduces radioactive substances when releasing the gas released from the containment vessel to the external environment in order to depressurize the pressurized containment vessel (for example, Patent Document 1, Patent). Reference 2).

  Installation of a filter vent device in an existing reactor building is difficult because of restrictions such as the weight of the filter vent device, space in the reactor building, shielding, and strength of the enclosure. Therefore, it is conceivable that the filter vent device is installed outside the reactor building.

JP-A-4-216497 JP-A-6-214094

  When a building equipped with a filter vent device is installed outdoors, the tsunami that caused the accident at the Fukushima Nuclear Power Station caused the inundation of the site and the collision of drifting objects. It is also necessary to newly consider severe accidents such as.

  However, until now, even if a severe accident has occurred, in order to maintain the soundness of the function of the filter vent device, there has been a lack of examination on how to make a filter vent building equipped with the filter vent device.

  Then, an object of this invention is to provide the filter vent building provided with the filter vent apparatus for maintaining the soundness of the function of a filter vent apparatus even if a severe accident occurs.

Filter vent buildings of this embodiment, a filter vent chamber to store the filter vent apparatus, a shared area is disposed proximate the top of the filter vent chamber, a heat radiation tank having an opening at the top, the filter A filter vent building comprising a heat transfer pipe that receives heat from a vent chamber and dissipates heat in the heat radiating tank; The entire building is configured to be buried in the ground so that the upper surface of the lattice plate fitted in the opening of the heat radiating tank is flush with the ground surface.

In addition, the filter vent building of this embodiment is a filter vent building in which the entire building is buried in the ground.

  Further, the filter vent building of the present embodiment is a filter vent building buried in the ground, and a filter vent chamber in which a filter vent device is installed inside surrounded by a shielding wall, and a side surface of the filter vent chamber. A pump chamber that is installed adjacent to the drainage pump for performing drainage and transfer of the filter vent device, and is disposed on an upper portion of the pump chamber and a side surface of the filter vent chamber. The pump chamber includes an opening / closing port that can be opened and closed. A staircase that is partitioned by a shielding floor and is provided close to the pump room and the upper part of the filter vent room and the staircase, and enters and exits part of the ceiling from the ground. And a common area having a watertight hatch that can be used.

  The filter vent building of the present embodiment is a filter vent building buried in the ground, and includes a filter vent chamber in which a filter vent device is installed inside a wall surrounded by a shielding wall, the filter vent chamber, and the heat transfer tube. It is the area | region for radiating the heat | fever received by the said filter vent chamber, and the upper part is equipped with the thermal radiation tank opened by the ground surface.

  ADVANTAGE OF THE INVENTION According to this invention, the filter vent building provided with the filter vent apparatus for maintaining the soundness of the function of a filter vent apparatus even if severe accident occurs can be provided.

The figure which shows the filter vent building of this embodiment. The perspective view of the lattice board 6. FIG. The figure which shows the filter vent building of the 1st modification of this embodiment. The figure which shows the filter vent building of the 2nd modification of this embodiment.

  Below, it demonstrates, referring drawings for embodiment of the filter vent building of this invention.

  FIG. 1 is a view showing a filter vent building of the present embodiment.

  The filter vent building includes a filter vent chamber 3 that houses the filter vent device 2 with a shielding wall 20, a common area 11 that is disposed in the vicinity of the upper portion of the filter vent chamber 3, and a heat dissipation tank 4 that has an opening at the upper portion. And a heat transfer tube 5 arranged to receive heat from the filter vent chamber 3 and to exhaust heat in the heat radiating tank 4.

  The filter vent building includes an upper surface of a watertight hatch 15 provided as an opening / closing port that can be opened and closed at a part of the ceiling of the common area 11, and an upper surface of a lattice plate 6 fitted in the opening of the heat radiating tank 4. The entire building is buried in the ground so that it is flush with the ground surface. The upper part of the filter vent building other than the watertight hatch 15 and the lattice plate 6 is covered with a concrete layer.

  With such a configuration, it is possible to enter and exit the filter vent building while being buried so as not to protrude from the ground, and to exhaust heat from the filter vent chamber.

  Next, the entire structure of the filter vent building will be described in more detail.

  The entire building 1 of the filter vent building is buried in the ground. In the filter vent chamber 3, the filter vent device 2 is installed in an interior surrounded by a shielding wall 20.

  The pump chamber 7 is adjacent to the side surface of the filter vent chamber 3 and is provided with a drainage transfer pump 8 that drains and transfers the filter vent device 2. The pump chamber 7 is also covered with a shielding wall 20. The staircase 9 is disposed on the upper side of the pump chamber 7 and on the side surface of the filter vent chamber 3, and is partitioned from the pump chamber 7 by a shielding wall (shielding floor) 20 including an opening / closing port that can be opened and closed. It is provided to go to and from.

  The common area 11 is provided in the vicinity of the upper part of the filter vent chamber 3 and the staircase 9, and has a watertight hatch 15 capable of entering and exiting from a part of the ceiling.

  The heat radiating tank 4 is connected to the filter vent chamber 3 via the heat transfer tube 5, receives heat in the filter vent chamber 3 on the heat transfer tube 5-1 side, and dissipates heat on the heat transfer tube 5-2 side. The upper part is open to the ground surface.

  Next, each component in the building housing 1 will be described in more detail.

  The filter vent device 2 is connected to a reactor containment vessel (not shown) by piping, and when a predetermined pressure is exceeded in the reactor containment vessel for some reason such as when a severe accident occurs, the reactor containment vessel The gas inside flows in. The filter vent device 2 removes / reduces the radioactive substance of the gas that has flowed in, and releases the removed / reduced gas (gas).

  The filter vent chamber 3 is a chamber for storing the gas released from the filter vent device 2 and has a vertical structure with a sufficient area in the height direction, and in order to prevent leakage of radioactivity to the outside, It is covered with a shielding wall 20. The filter vent device 2 is installed at the lowermost part of the filter vent chamber 3.

  The heat dissipation tank 4 is fitted with a lattice plate 6 at an upper portion thereof and opens to the ground via a gap between the lattice plates 6. An example of the lattice plate 6 is shown in FIG. The upper part of the lattice plate 6 and the ground surface are arranged so as to be substantially coplanar. It is assumed that the gap between the lattices of the lattice plate 6 is shorter than the distance between the two tubes adjacent to each other when a heat transfer tube 5-2 (described later) is folded back. The heat radiation tank 4 may be in an empty state (atmosphere) or may be filled with cooling water (water).

  The heat transfer tube 5 is disposed across the filter vent chamber 3 and the heat radiating tank 4, receives heat from the atmosphere in the filter vent chamber 3 by the heat transfer tube 5-1, and receives the atmosphere in the heat radiating tank 4 by the heat transfer tube 5-2. Dissipate heat to water.

  The pump chamber 7 includes a drainage transfer pump 8 that is connected to the filter vent device 2 by a pipe or the like and stirs the water in the filter vent device 2 or replaces the water. In addition, illustration about the pipe etc. which are connected with the filter vent apparatus 2 and the waste_water | drain transfer pump 8 is abbreviate | omitted. Since the drainage transfer pump 8 is connected to the filter vent device 2, it is desirable that the distance to the filter vent device 2 is as close as possible. In the present embodiment, the drainage transfer pump 8 is arranged almost directly through a shielding plate.

  The staircase 9 includes a staircase 10 that connects the common area 11 and the pump chamber 7. A part of the floor of the staircase 9 has a shielding door or watertight hatch (not shown) that can enter and exit the pump room to reduce radioactivity.

  The common area 11 includes a valve and a meter base related to the filter vent device 2, and a chemical solution tank 12 for preventing iodine dissolved and retained in the water in the filter vent device 2 from being released by re-volatilization. ing. Moreover, the crane 13 for using when performing the maintenance of the filter vent apparatus 2 or the waste_water | drain transfer pump 8 may be provided. Furthermore, it is desirable that the entrance / exit for entering the filter vent chamber 3 from the common area 11 is a watertight hatch 14 having a shielding effect.

  The common area 11 is disposed above the staircase 9 connected to the filter vent chamber 3 and the pump chamber 7, and is adjacent to the ground surface at the top. In addition, a watertight hatch 15 is provided on a part of the upper surface of the shared area 11 as a sole entrance for entering and exiting the shared area 15 from the outside.

  The shared area 11 having such a configuration is surely routed when an operator enters and exits the filter vent chamber 3 and the pump chamber 7 at the time of operation of the equipment related to the filter vent device 2 and maintenance.

  The filter vent building of the present embodiment described above can enter and exit the filter vent building while being buried so as not to protrude from the ground, and can exhaust heat from the filter vent chamber.

  Further, according to the present embodiment, the heat transfer pipe connecting the filter vent chamber and the heat radiating tank transfers the heat of the filter vent chamber to the heat radiating tank, and the heat of the heat radiating tank can be released to the outside air. Became. Furthermore, by making the upper part of the heat radiating tank a lattice plate, it is possible to prevent drifting objects having a size exceeding the distance between the heat transfer tubes from entering from the upper part of the heat radiating tank due to the tsunami and damaging the heat transfer tubes. Even if the water source runs out, it is possible to replenish water from the top of the heat dissipation tank. In the case of a tsunami, water can be automatically supplied.

  Moreover, in this embodiment, installation of the opening door of an entrance / exit and the entrance / exit of an apparatus were provided in the above-ground part, and the filter vent apparatus used as a radiation source was installed in the lowest part of the building made into the shaft structure. By installing a watertight hatch for entering and exiting equipment that does not protrude above the ground, and using one opening, it is possible to reduce the risk of inundation due to the tsunami and the risk of collision between drifting objects and external flying objects due to the tsunami. In addition, since the filter vent device serving as a radiation source is installed at the lowest part of the building having a vertical shaft structure, even after the venting by the filter vent device is performed, the common area 11 where the operator always stops. Since the distance from the radiation source is large, the amount of exposure can be reduced.

  The filter vent device that is activated during severe accidents does not rely on active intervention such as the operator starting the device, and the filter vent device needs to be refilled when the passive operation time that can keep the reactor safe is exceeded It becomes. Therefore, it is important that the operator can check the amount of water with an instrument that is close to the operation room and can supply water as needed. It is important for the operator to approach.

  In this embodiment, by adding a common area to the upper part of the filter vent room and the staircase, the connection part of the water supply system necessary for long-term operation and the operation place for manual opening and closing of the valve can be approached after the accident. It becomes possible to secure as.

  It can also be used for water quality surveys of filter vents that are conducted once a year in common areas, water quality surveys of filter vents that are conducted once a year in areas for equipment maintenance, and areas for equipment maintenance. Not only will it improve the maintainability during normal operation.

  In addition, the liquid chemical tank to keep the water quality in the filter vent device safe is installed in a common area, so that when the filter system starts up, the chemical solution falls down into the filter vent device where the chemical solution is installed downward due to the pressure in the process piping. This enables a static function that is unaffected by accidents.

  Next, a modification of the above embodiment will be described.

  FIG. 3 shows a filter vent building of a first modification of the present embodiment.

  Compared with the filter vent building of FIG. 1, the shape of the filter vent chamber 3 and the arrangement of the common area 11 are different. That is, a part of the ceiling of the filter vent chamber 3 is in the lower part of the shared area 11, but the other part of the ceiling is structured to protrude from the side surface of the shared area 11. In addition, the shape of the heat transfer tube 5 is changed to the shape accompanying this, and the shape of the shielding wall 20 covering the filter vent chamber 3 is also changed. Note that the width of the filter vent chamber 3 (left and right direction in the drawing) may be the same as or longer than that of the above embodiment. Other structures are not particularly different from those of the above-described embodiment, and there are no particular changes in effects.

  FIG. 4 shows a filter vent building of a first modified example of the present embodiment.

  Compared with the filter vent building of FIG. 4, the arrangement of the heat radiation tank 4 and the arrangement of the common area 11 are different. That is, a part of the ceiling of the filter vent chamber 3 is in the lower part of the common area 11, but the heat radiating tank 4 is arranged in the other part of the ceiling. Moreover, the shape of the heat exchanger tube 5 is also changed to the shape accompanying this. Note that the width of the filter vent chamber 3 (left and right direction in the drawing) may be the same as or longer than that of the above embodiment. Other structures are not particularly different from those of the above-described embodiment, and there are no particular changes in effects.

  As mentioned above, although this invention was demonstrated using embodiment and its modification, these embodiment and modification are shown as an example and are not intending limiting the range of invention. These embodiments and modifications can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Building housing, 2 ... Filter vent apparatus, 3 ... Filter vent chamber, 4 ... Radiation tank,
5 ... Heat transfer tube, 6 ... Grid plate, 7 ... Pump chamber, 8 ... Stirring transfer pump, 9 ... Staircase,
10 ... Stairs, 11 ... Common areas, 12 ... Chemical tanks, 13 ... Rails,
14, 15 ... Watertight hatch, 20 ... Shielding wall

Claims (5)

The filter vent device and the filter vent chamber to store a shared area is disposed proximate the top of the filter vent chamber, a heat radiation tank having an opening at the top, in the radiator tank and heat from the filter vent chamber A filter vent building comprising a heat transfer tube arranged to exhaust heat,
The upper surface of the watertight hatch provided as an opening / closing port that can be opened and closed at a part of the ceiling of the common area and the upper surface of the lattice plate fitted to the opening of the heat radiating tank are flush with the ground surface. The filter vent building is constructed so that the entire building is buried in the ground. The entire building is a filter vent building buried in the ground ,
A filter vent chamber in which the filter vent device is installed inside the filter vent building and is surrounded by a shielding wall;
A pump chamber that is adjacent to a side surface of the filter vent chamber and in which a drainage transfer pump for draining and transferring the filter vent device is installed;
A staircase that is disposed on the upper side of the pump chamber and a side surface of the filter vent chamber, partitioned from the pump chamber by a shielding floor including an openable / closable entrance and exit, and provided in order to go to and from the pump chamber
A common area having a watertight hatch that is installed close to the upper part of the filter vent chamber and the staircase and can enter and exit from a part of the ceiling,
A region connected to the filter vent chamber via a heat transfer tube and for radiating heat received in the filter vent chamber, the upper portion of which is provided with a heat radiating tank opened to the ground surface. Filter vent building.   The filter vent building according to claim 2, wherein a lattice plate is fitted into the opening of the heat radiating tank. The entire building is a filter vent building buried in the ground ,
A filter vent chamber in which the filter vent device is installed inside the filter vent building and is surrounded by a shielding wall;
A pump chamber that is adjacent to a side surface of the filter vent chamber and in which a drainage transfer pump for draining and transferring the filter vent device is installed;
A staircase that is disposed on the upper side of the pump chamber and a side surface of the filter vent chamber, partitioned from the pump chamber by a shielding floor including an openable / closable entrance and exit, and provided in order to go to and from the pump chamber,
A filter vent building, comprising: a common area having a watertight hatch that is installed in the vicinity of the upper part of the filter vent chamber and the staircase and can enter and exit from a part of the ceiling. A filter vent building buried in the ground,
A filter vent chamber in which a filter vent device is installed in an interior surrounded by a shielding wall;
A region connected to the filter vent chamber via a heat transfer tube and for radiating heat received in the filter vent chamber, the upper portion of which is provided with a heat radiating tank opened to the ground surface. Filter vent building.

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