JP4772489B2 - Reactor building - Google Patents

Description

The present invention also relates to a nuclear reactor construction shop.

  A spent fuel pool for storing spent fuel is installed in the reactor building containing the reactor. The opening of the spent fuel pool is located on the operation floor. Therefore, measures have been taken to prevent the pool water stored in the spent fuel pool from overflowing due to sloshing during an earthquake or the like.

For example, Patent Document 1 discloses a sloshing overflow prevention device. This sloshing overflow prevention device has a mechanism that operates by automatically detecting earthquake detection signals or fluctuations in the pool water level, and installs a flat plate that can be freely operated on the pool wall in the pool water. Suppresses sloshing in pool water. Moreover, it has the equipment which stores the overflow by sloshing in the container provided in the pool periphery.
JP-A-8-101296

  Recently, there has been a movement to review the earthquake motion that has been used for the seismic design of nuclear power generation facilities, and even larger earthquake motions tend to become the design conditions for nuclear power generation facilities. As the design seismic motion is reviewed, the overflow height due to sloshing tends to exceed that previously assumed, and there is further concern about the overflow of the flood around the spent fuel pool.

  However, the conventional technology suppresses the pool water from overflowing from the spent fuel pool, but does not prevent the overflow of the pool water from spreading around the pool. In addition, it is possible to store a relatively small amount of overflowing pool water, but it is considered difficult to store a large amount of overflow water at one time. Therefore, it is necessary to suppress as much as possible the storage pool water of spent fuel overflowing the floor due to sloshing and flowing out to the lower floor, and to improve the reliability of the nuclear power plant.

  In order to solve the above-described problems, an object of the present invention is to suppress the water stored in the spent fuel pool from flowing out to the lower floor of the operation floor.

In order to achieve the above object, the present invention provides a spent fuel pool for storing spent fuel taken out of the reactor in water in a reactor building containing a reactor, and an uppermost side wall of the spent fuel pool. A spent fuel pool weir, an operating floor that is connected to an opening of the spent fuel pool, is higher than the surface of the spent fuel pool, a floor drain pipe provided on the operating floor, and the spent fuel pool. An enclosing groove-like fuel changer travel rail pit, a drainage channel connecting the fuel changer travel rail pit and the spent fuel pool, and an embankment provided on the operation floor and surrounding the spent fuel pool When, wherein the embankment surrounds the refueling machine running rail pits, comprises a non-return structure flowing water only from the operation floor of the outside to the fuel replacement apparatus running rail pit side of the inner It has a drainage ditch, further characterized in that it comprises a removable plate with handrail extending over the embankment.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the water stored in the spent fuel pool flows out to the lower floor of an operation floor.

  An embodiment of a reactor state monitoring apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a reactor building according to an embodiment of the present invention, and is a sectional view taken along line BB in FIG.

  A nuclear reactor 22 is built in the nuclear reactor building 21. Above the nuclear reactor 22, there is an operation floor 12 that can perform operations such as fuel replacement. The operation floor 12 is provided with a reactor upper opening 24 for accessing the reactor 22, and the reactor upper opening is closed with a lid 14 during normal operation. Further, a spent fuel pool 1 and a D / S pool (equipment pool) 7 are arranged so as to sandwich the nuclear reactor 22. Openings of the spent fuel pool 1 and the D / S pool 7 are provided in the operation floor 12. The spent fuel pool 1 is filled with water, and spent fuel 23 is stored.

  At the time of periodic inspection, the lid 14 closing the reactor upper opening 24 is removed, and the steam dryer (not shown) and the moisture separator (not shown) taken out from the reactor 22 are filled with water. It is temporarily placed in the filled equipment pool 7. Further, the arrangement of the fuel in the nuclear reactor 22 is changed using a fuel changer (not shown), and a part of the fuel is taken out to the spent fuel pool 1.

  FIG. 2 is a plan view of the operation floor 12 according to the embodiment of the present invention, and is a part of a cross-sectional view taken along the line AA in FIG.

  On the operation floor 12, there is a groove-like fuel changer travel rail pit 3 surrounding the spent fuel pool 1, the lid 14 and the D / S pool 7. The fuel changer travel rail pit 3 is provided with a fuel changer travel rail 13 for traveling a fuel changer (not shown). An embankment 4 is provided around the fuel changer travel rail pit 3. A drainage groove 11 is formed on the bank 4. In addition to the spent fuel pool 1 and the D / S pool 7, the operation floor 12 has an opening 9. The opening 9 is provided with a watertight opening / closing means.

  FIG. 3 is a longitudinal sectional view of the vicinity of the operation floor according to the embodiment of the present invention, and is a sectional view taken along the line CC in FIG.

  The water surface 2 of the spent fuel pool 1 is at a position lower than the operation floor 12, and a spent fuel pool weir 5 is provided at the top of the side wall of the spent fuel pool 1. A drainage channel 6 that leads from the fuel changer travel rail pit 3 to the spent fuel pool 1 is provided. The drainage channel 6 is structured such that water flows from the fuel changer travel rail pit 3 to the spent fuel pool 1. A plurality of floor drain pipes 10 are installed on the operation floor 12.

  FIG. 4 is a perspective view of an embankment according to an embodiment of the present invention.

  The embankment 4 has a shape in which a prism is installed on the operation floor 12, and a drainage groove 11 is provided in a part thereof. A handrail 8 with a plate is attached to the top of the bank 4.

  In this embodiment, the bank 4 is made higher than the spent fuel pool weir 5, and a handrail 8 with a plate for suppressing overflow is installed on the bank 4. The plate-equipped handrail 8 has a structure in which, for example, a flat plate is disposed along a handrail having a frame structure, and the upper end of the levee 4 is extended upward in a substantially watertight manner. For this reason, the amount of overflowing water generated by sloshing overflowing to the outside of the embankment 4 can be suppressed, and the overflowing water can be temporarily stored inside the embankment 4. The handrail 8 with a plate can prevent a higher wave of sloshing if it extends to a high position in the vertical direction, but the wave of the sloshing caused by the sloshing is assumed so as not to disturb the work on the operation floor 12. It is desirable to set the height appropriate for the height.

  The water overflowing to the outside of the embankment 4 can be collected inside the embankment 4 through the drainage groove 11. Further, the drainage groove 11 may be provided with a check structure in which water flows only from the outside to the inside of the dike 4, and the amount of water overflowing to the outside of the dike 4 can be reduced.

Further, since the drainage channel 6 is provided between the fuel changer travel rail pit 3 and the spent fuel pool 1 and the D / S pool 7, overflow due to sloshing is caused by the spent fuel pool 1 and the D / S pool 7 To be recovered. Incidentally, comprising as water, such as spent fuel pool 1 does not flow into the refueling machine running rail pits 3 through the drainage channel 6, or a bent shape drainage 6, a check valve in the drain passage 6 You may keep it.

  Further, since the operation floor 12 has a watertight structure, the opening 9 is provided with a watertight structure opening / closing means, and further has a means for sealing the floor drainage pipe 10, so that the overflowing water beyond the embankment 4 When it occurs, pool water can be temporarily stored on the operation floor 12. Further, since the drainage ditch 11 is provided in the levee 4, water that overflows beyond the levee 4 and is temporarily stored on the operation floor 12 is collected in the fuel storage pool 1 and the D / S pool 7. Can do.

  Further, even in the existing nuclear reactor building where no anti-sloshing measures are taken, the bank 4, the handrail with plate 8, the drainage channel 6, the opening and closing means of the watertight structure of the opening 9, the sealing means of the floor drain pipe 10, etc. The above-described effects can be obtained by remodeling to install.

  The above description is merely an example, and the present invention is not limited to the above-described embodiments, and can be implemented in various forms. For example, a filter for removing foreign matter may be provided in the drainage channel 6 so that foreign matter does not enter the spent fuel pool 1 and the like along with water overflowing through the drainage channel 6. Further, the plate portion of the handrail with plate 8 and the handrail with plate itself can be temporarily removed, and can be removed during work on the operation floor 12 during periodic inspections, etc., so that work efficiency can be improved. You may keep it.

The longitudinal cross-sectional view of the reactor building which concerns on one Embodiment of this invention. The top view of the operation floor which concerns on one Embodiment of this invention. The longitudinal section near the operation floor concerning one embodiment of the present invention. The perspective view of the embankment vicinity which concerns on one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Spent fuel pool, 2 ... Water surface, 3 ... Fuel changer traveling rail pit, 4 ... Dike, 5 ... Spent fuel pool weir, 6 ... Drainage channel, 7 ... D / S pool, 8 ... Handrail with plate , 9 ... opening, 10 ... floor drain piping, 11 ... drainage groove, 12 ... operation floor, 13 ... fuel changer traveling rail, 14 ... lid, 22 ... nuclear reactor, 24 ... reactor upper opening

Claims (4)

In the reactor building that contains the reactor,
A spent fuel pool for storing spent fuel removed from the reactor in water;
A spent fuel pool weir at the uppermost side wall of the spent fuel pool;
An operation floor connected to the opening of the spent fuel pool and higher than the surface of the spent fuel pool;
Floor drain piping provided on the operation floor;
A grooved fuel changer travel rail pit surrounding the spent fuel pool;
A drainage channel connecting the fuel changer travel rail pit and the spent fuel pool ;
An embankment provided on the operation floor and surrounding the spent fuel pool;
With
The embankment has a drainage groove that includes a check structure that surrounds the fuel changer travel rail pit and allows water to flow only from the operation floor outside the fuel changer travel rail pit to the inside of the fuel changer travel rail pit. And further comprising a detachable handrail extending over the levee,
Reactor building characterized by that. The drainage channel is claim 1 reactor building, wherein the retaining clips lifting the return function to prevent water from flowing toward the from the spent fuel pool in the fuel replacement apparatus running rail pits.   The levee includes a reactor upper opening provided on the operation floor above the reactor, and an equipment pool for temporarily placing the removed equipment in the reactor disposed in the operation floor in water. The reactor building according to claim 1, wherein the reactor building surrounds the reactor building. The opening part provided in the wall surrounding the said operation floor and the said operation floor outside the said embankment is provided with the opening-closing means of a watertight structure, The Claim 1 thru | or 3 characterized by the above-mentioned. Reactor building.

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