JP2013245015A - Sloshing suppression system for fuel pool and nuclear power generation facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sloshing suppression system for a fuel pool, capable of suppressing or preventing overflow stream by sloshing without deterioration in workability of the fuel pool.SOLUTION: A sloshing suppression system for suppressing sloshing within a fuel pool in which a plurality of fuel racks 1 housing fuel are disposed includes: a suppression member 2A which suppresses sloshing against a flow of liquid by sloshing; and a column support member 4 which is provided in a gap formed between the plurality of fuel racks 1 to support the suppression member 2A inserted thereto from above.

Description

  Embodiments described herein relate generally to a sloshing suppression device and a nuclear power generation facility installed in a spent fuel pool.

  In a spent fuel pool in a nuclear power generation facility, a sloshing phenomenon (hereinafter, simply referred to as sloshing) occurs in which the liquid inside fluctuates with a relatively large amplitude due to earthquake motion. When such sloshing occurs, the liquid stored in the spent fuel pool may leak to the outside. Therefore, in the spent fuel pool in the nuclear power generation facility, it is necessary to prevent overflow due to sloshing during an earthquake.

  As a conventional technique for preventing overflow due to the sloshing, there is a technique described in Patent Document 1, for example. In this technique, a wall surface member protruding above the fuel rack is provided, and the resistance against the liquid flow in the horizontal direction is increased by the wall surface member. Thereby, the rocking | fluctuation of the liquid by sloshing is suppressed.

JP-A-61-82197

  By the way, in the technique described in Patent Document 1 described above, when the spent fuel is stored in the fuel rack, the wall member protruding above the fuel rack hinders the movement of the spent fuel suspended from the fuel exchanger. There is a problem that the workability is lowered.

  Embodiments of the present invention have been made in view of such circumstances, and a fuel pool sloshing suppression device and a nuclear power generation facility capable of suppressing or preventing overflow due to sloshing without reducing the workability of the fuel pool The purpose is to provide.

  In order to achieve the above object, a fuel pool sloshing suppression device according to an embodiment of the present invention is a spent fuel pool sloshing suppression device that suppresses sloshing in a fuel pool in which a plurality of fuel racks for storing fuel are arranged. And a restraining member that resists the flow of the liquid due to the sloshing and restrains the sloshing, and is provided in a gap formed between the plurality of fuel racks, and supports the restraining member inserted from above. And a support member.

  A nuclear power generation facility according to an embodiment of the present invention is a nuclear power generation facility comprising a fuel pool in which a plurality of fuel racks for storing fuel are arranged, and a sloshing suppression device that suppresses sloshing in the fuel pool, The sloshing suppression device includes a suppression member that resists the flow of liquid due to the sloshing and suppresses the sloshing, and the suppression member that is inserted into the gap formed between the plurality of fuel racks. And a supporting member for supporting.

  According to the embodiment of the present invention, overflow due to sloshing can be suppressed or prevented in advance without reducing the workability of the fuel pool.

It is a perspective view which shows the sloshing suppression apparatus by 1st Embodiment of this invention. It is a top view which shows the pillar support member of the sloshing suppression apparatus by 2nd Embodiment of this invention. It is an expansion perspective view which shows the column support member of FIG. It is a front view which shows the suppression member of the sloshing suppression apparatus by 3rd Embodiment of this invention. It is a schematic plan view which shows the spent fuel pool and sloshing suppression apparatus by 4th Embodiment of this invention. It is an enlarged view which shows the sloshing suppression apparatus of FIG. It is a side view which shows the sloshing suppression apparatus by 5th Embodiment of this invention. It is an enlarged elevation view which shows the mounting part of the reinforcement member of FIG. It is a side view which shows the sloshing suppression apparatus by other embodiment of this invention. It is a side view which shows the sloshing suppression apparatus by further another embodiment of this invention.

  Hereinafter, embodiments of a sloshing suppression device for a fuel pool according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view showing a sloshing suppression device according to a first embodiment of the present invention. FIG. 1 shows one of the plurality of fuel racks installed in the spent fuel pool.

(Constitution)
As shown in FIG. 1, the fuel rack 1 is formed in a box shape and stores spent fuel. A plurality of fuel racks 1 are installed in a spent fuel pool (not shown) that stores liquid. Column support members 4 as support members are fixed to the three side surfaces of the fuel rack 1 in two upper and lower stages by fastening members such as bolts. The column support member 4 is provided with a gap between one side surface of the fuel rack 1. A restraining member 2A composed of the resistance plate 2 and the pillar 3 is inserted into the gap from above.

  Specifically, two pillars 3 are inserted into the gap between the pillar support member 4 and one side surface of the fuel rack 1 from above. These two pillars 3 are formed in a cylindrical shape. The two pillars 3 are attached to both sides of the resistance plate 2 and support the resistance plate 2. The two pillars 3 are set to a height that is approximately twice the height of the fuel rack 1. Therefore, at least a part of the two pillars 3 is located between the fuel racks 1 and supports the resistance plate 2.

  The resistance plate 2 resists the flow of liquid due to sloshing generated in the spent fuel pool due to earthquake motion. The resistance plate 2 is supported at a position higher than the height of the fuel rack 1 in the two pillars 3. The width of the resistance plate 2 is set to the same length as one side of the fuel rack 1 or slightly shorter. In a state where the column 3 is inserted into the column support member 4 from above, the resistance plate 2 is installed so as to protrude vertically above a position higher than the upper end of the fuel rack 1. The resistance plate 2 has a wide surface with the largest area substantially parallel to the vertical axis.

  Although not shown, it is desirable that the upper end of the resistance plate 2 or the two columns 3 has a structure that can be held from above by a crane or the like, such as an eye bolt or an insertion hole for inserting a wire. These eyebolts and insertion holes are used when the restraining member 2A composed of the resistance plate 2 and the two pillars 3 is suspended and moved by the fuel exchanger.

(Function and effect)
Next, the operation of this embodiment will be described.

  In the spent fuel pool containing the liquid, a plurality of fuel racks 1 to which the column support members 4 are fixed are arranged vertically and horizontally at regular intervals. Then, the spent fuel is suspended from the fuel exchanger and sequentially stored in the fuel rack 1 in the spent fuel pool.

  After the spent fuel is stored in the fuel rack 1, the restraining member 2A is lifted and moved by the fuel exchanger using the eyebolts and the insertion holes.

  When the restraint member 2A is positioned above the gap between one side surface of the fuel rack 1 to which the restraining member 2A is to be attached and the column support member 4, the fuel exchanger is operated to gradually lower the restraining member 2A. Two pillars 3 are inserted into the top from above. Thereby, the suppression member 2 </ b> A is supported by the column support member 4. In this case, the resistance plate 2 is installed so as to protrude at a position higher than the upper end of the fuel rack 1.

  When sloshing occurs in the spent fuel pool due to an earthquake or the like, a horizontal flow occurs at a position higher than the upper end of the fuel rack 1. At that time, the resistance plate 2 projecting vertically upward from the upper portion of the fuel rack 1 becomes resistant to the flow of the liquid. As a result, sloshing in the spent fuel pool can be suppressed, and overflow from the spent fuel pool can be prevented.

  Moreover, since it installs only by inserting the two pillars 3 in the pillar support member 4 from upper direction, removal of the suppression member 2A is easy. Therefore, it is possible to suppress sloshing while suppressing a decrease in workability of the spent fuel pool as much as possible.

  As described above, according to the present embodiment, the spent fuel is supported by inserting the two columns 3 into the gap between the one side surface of the fuel rack 1 and the column support member 4 from above to support the suppressing member 2A. Overflow from the spent fuel pool due to sloshing can be prevented in advance without reducing the workability of the pool.

(Second Embodiment)
FIG. 2 is a plan view showing a column support member of a sloshing suppressing device according to a second embodiment of the present invention. FIG. 3 is an enlarged perspective view showing the column support member of FIG. In the following embodiments, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

(Constitution)
As shown in FIG. 2, a plurality of fuel racks 1 are arranged vertically and horizontally at regular intervals, and four adjacent fuel racks 1 form a cross-shaped gap. A plurality of such cross-shaped gaps are formed. The column support member 5 as a support member is formed in a planar cross shape as shown in FIGS. 2 and 3 in order to be arranged in conformity with the cross-shaped gap. The column support member 5 is formed with holes 6 for inserting one column 3 near the outer end at the upper end of each side.

  Further, the column support member 5 is not directly attached to the fuel rack 1 but is constrained in a form sandwiched between cross-shaped gaps formed between four adjacent fuel racks 1. Here, it is desirable that the column support member 5 be installed in advance simultaneously with the installation of the fuel rack 1.

  A restraining member 2 </ b> A shown in FIG. 1 is attached to the column support member 5. Specifically, as shown in FIG. 2, one of the two pillars 3 is inserted into the hole 6 of one pillar support member 5. Further, the other one of the two pillars 3 is inserted into the hole 6 closest to the other pillar support member 5 adjacent to the one pillar support member 5. Thereby, the two pillar support members 5 support the suppressing member 2A.

(Function and effect)
Next, the operation of this embodiment will be described.

  In the present embodiment, the column support member 5 formed in a planar cross shape is installed in advance in a cross-shaped gap formed by four adjacent fuel racks 1. After the spent fuel is stored in the fuel rack 1, the restraining member 2A is lifted and moved by the fuel changer using the eyebolts and the insertion holes.

  When the suppression member 2A is positioned above the gap between the one column support member 5 and the other column support member 5 to which the suppression member 2A is to be attached, the fuel changer is operated to gradually lower the suppression member 2A. One of the pillars 3 is inserted into the hole 6 of one pillar support member 5. Further, the other one of the two pillars 3 is inserted into the nearest hole 6 of the other pillar support member 5. Thereby, the suppression member 2 </ b> A is supported by the one column support member 5 and the other column support member 5.

  Thus, according to the present embodiment, the column support member 5 formed in a planar cross shape is installed in advance in the cross-shaped gap formed by the four adjacent fuel racks 1, and the two columns 3 It becomes possible to install the restraining member 2 </ b> A simply by inserting the above into the hole 6 of the column support member 5. Therefore, similarly to the first embodiment, the attaching / detaching work of the restraining member 2A is facilitated, and the deterioration of workability of the spent fuel pool can be suppressed.

  In this embodiment, the hole 6 is formed in the vicinity of the end of the cross of the column support member 5, but even if it is formed in the vicinity of the center of the cross, a plurality of holes 6 are formed from the vicinity of the center to the vicinity of the end. May be. This is determined according to the width of the suppressing member 2A to be installed.

(Third embodiment)
FIG. 4 is a front view showing a suppressing member of the sloshing suppressing device according to the third embodiment of the present invention.

  As shown in FIG. 4, five circular through holes 7 are formed in the length direction and two width directions in the resistance plate 2 of the suppressing member 2 </ b> B of the present embodiment. These through-holes 7 are not limited to a circle but may be other shapes such as an ellipse or a polygon.

  Therefore, in the present embodiment, when sloshing occurs due to an earthquake or the like in the spent fuel pool, a flow of water passing through the horizontal through holes 7 is generated. When this flow passes through the plurality of through holes 7 of the resistance plate 2, vortices are easily generated, and resistance to the flow of the resistance plate 2 can be further increased. Specifically, since the water that has passed through the through-hole 7 swirls, the energy that the water has is consumed, so that the energy that the water oscillates can be dissipated.

  Thus, according to the present embodiment, the sloshing suppression effect can be further enhanced by forming the plurality of through holes 7 in the resistance plate 2 of the suppression member 2B.

(Fourth embodiment)
FIG. 5 is a schematic plan view showing a spent fuel pool and a sloshing suppression device according to a fourth embodiment of the present invention. FIG. 6 is an enlarged view showing the sloshing suppression device of FIG.

  As shown in FIG. 5, the spent fuel pool 10 is formed in a rectangular shape as viewed from above. In the present embodiment, a plurality of restraining members 2A having the same configuration as that of the first embodiment are installed in a direction opposite to the longitudinal direction of the spent fuel pool 10 and the shorter direction of the spent fuel pool 10, respectively.

  Specifically, a plurality of fuel racks 1 are arranged vertically and horizontally at regular intervals, and in FIG. 6, in order to distinguish the plurality of fuel racks 1, a description is given with reference numerals 1 a to 1 d. It is assumed that the column support members 4 (not shown) are fixed to the fuel racks indicated by the reference numerals 1a to 1d, respectively, as in the first embodiment. In the gap between the column support member 4 and the side surfaces of the fuel racks 1a to 1d, a suppression member 2A similar to that of the first embodiment is inserted from above.

  The restraining member 2A installed between the fuel rack 1a and the fuel rack 1d and the restraining member 2A installed between the fuel rack 1b and the fuel rack 1c are opposed to the longitudinal direction of the spent fuel pool 10. Is installed.

  The restraining member 2A installed between the fuel rack 1a and the fuel rack 1b and the restraining member 2A installed between the fuel rack 1c and the fuel rack 1d are arranged in the short direction of the spent fuel pool 10. It is installed in the opposite direction.

  As described above, according to the present embodiment, the restraining member 2A is installed in the direction opposite to the longitudinal direction of the spent fuel pool 10 and the lateral direction, so that the longitudinal direction and the lateral direction of the spent fuel pool 10 are reduced. The resistance can be increased with respect to the flow in both directions, and the effect of suppressing sloshing can be remarkably improved.

(Fifth embodiment)
FIG. 7 is a side view showing a sloshing suppressing device according to a fifth embodiment of the present invention. FIG. 8 is an enlarged elevation view showing a mounting portion of the reinforcing member of FIG.

  As shown in FIG. 7, in this embodiment, reinforcing members 8 a and 8 b are provided between one column 3 and two column support members 4, respectively, out of the two columns 3. Similarly, although not shown, reinforcing members 8a and 8b are also provided between the other column 3 and the two column support members 4, respectively.

  Specifically, the reinforcing members 8a and 8b have the same length. One end of each of the reinforcing members 8 a and 8 b is fixed by a fixing portion 11 at a position higher than the height of the fuel rack 1 in the pillar 3. Joining portions 9a and 9b are attached to the other ends of the reinforcing members 8a and 8b, respectively.

  These joint portions 9a and 9b are formed in a reverse side U-shape as shown in FIG. The joint portion 9 a is joined so as to be placed on the column support member 4 of one fuel rack 1. Similarly, the joint portion 9 b is joined so as to be placed on the column support member 4 of the other fuel rack 1.

  Therefore, this embodiment becomes a truss structure by providing the reinforcing members 8 a and 8 b between the pillar 3 and the pillar support member 4.

  As described above, according to the present embodiment, the reinforcing members 8a and 8b are provided between the column 3 and the column supporting member 4, and the reinforcing members 8a and 8b are connected to the normal line of the wide surface of the resistance plate 2 and the vertical axis. The mounting strength of the restraining member 2 </ b> A can be significantly improved by extending obliquely downward from the side surface of the resistance plate 2 and contacting the column support member 4.

  In addition, according to the present embodiment, the joining portions 9a and 9b attached to the other ends of the reinforcing members 8a and 8b are joined to be placed without being fixed to the column support member 4, It becomes easy to remove the restraining member 2A including the reinforcing members 8a and 8b.

(Other embodiments)
Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, in each of the above embodiments, the suppression member 2A has been described with respect to the example in which the pillars 3 are attached to both sides of the resistance plate 2. However, the invention is not limited thereto, and the suppression member 2A may be formed of a single rectangular plate material. In this case, it is desirable to provide a reinforcing portion on the outer peripheral edge of the resistance plate to achieve robustness and light weight.

  Moreover, in each said embodiment, although the two pillars 3 of 2 A of suppression members were formed in the column shape, it may not be restricted to this but what was formed in the ellipse or the prism shape.

  Further, the width of the resistance plate 2 has been described as being equal to or less than that of the fuel rack 1. However, the resistance plate 2 is wider than the width of the portion inserted into the column support member 4 (the length between the columns 3). The shape, that is, the outer shape may be a T-shape. As the resistance plate 2 is wider, the effect of suppressing sloshing increases. On the other hand, a narrower width causes less interference and is advantageous in workability. Therefore, it is desirable to determine the sloshing suppression effect and workability.

  Further, when the sloshing suppression effect is exhibited, it is considered that a considerable load is applied to the suppression member 2A and the fuel rack 1 that supports the suppression member 2A. Therefore, as shown in FIG. 9, the structure is supported from both of the fuel racks 1 sandwiching the restraining member 2 </ b> A, or as shown in FIG. 10, the column support portion 4 is provided so as to extend over the plurality of fuel racks 1. The load applied to the fuel rack 1 can be distributed.

DESCRIPTION OF SYMBOLS 1 ... Fuel rack, 2 ... Resistance board, 2A ... Suppression member, 2B ... Suppression member, 3 ... Column, 4 ... Column support member (support member), 5 ... Column support member (support member), 6 ... Hole, 7 ... Through holes, 8a, 8b ... reinforcing members, 9a, 9b ... joints, 10 ... spent fuel pool, 11 ... fixing parts

Claims (7)

A spent fuel pool sloshing suppression device that suppresses sloshing in a fuel pool in which a plurality of fuel racks for storing fuel are arranged,
A restraining member that resists the sloshing by resisting the flow of liquid due to the sloshing,
A support member that is provided in a gap formed between the plurality of fuel racks and supports the suppression member inserted from above;
A sloshing suppression device for a fuel pool, comprising:   The sloshing suppression device for a fuel pool according to claim 1, wherein the support member is attached to a side surface of the fuel rack.   In a state where the suppression member is inserted into the support member, at least a part of the suppression member is positioned higher than the upper end of the fuel rack, and the wide surface having the largest area is a resistance that is substantially parallel to the vertical axis. And a plurality of columns that are positioned between the fuel racks and support the resistance plate, and these columns are supported by being inserted into the support member from above. The sloshing suppression device for a fuel pool according to claim 1 or 2.   The sloshing suppression device for a fuel pool according to claim 3, wherein the resistance plate has a plurality of through holes. The plurality of fuel racks are arranged vertically and horizontally at regular intervals on a horizontal plane, and four adjacent fuel racks form a plurality of cross-shaped gaps,
The support member has a cross shape whose horizontal cross section fits into the cross-shaped gap, and a hole into which the pillar is inserted is formed near the outer end at the upper end of each side. The sloshing suppression device for a fuel pool according to claim 3 or 4, wherein each of the sloshing suppression devices is arranged in the cross-shaped gap.   A reinforcing member is provided between the column and the supporting member, and the reinforcing member extends obliquely downward from the side surface of the resistance plate on the surface including the normal line of the wide surface and the vertical axis. The fuel pool sloshing suppression device according to any one of claims 3 to 5, wherein the fuel pool sloshing is in contact with the fuel pool. A fuel pool having a plurality of fuel racks for storing fuel; and
A nuclear power generation facility comprising a sloshing suppression device that suppresses sloshing in the fuel pool,
The sloshing suppression device is
A restraining member that resists the sloshing by resisting the flow of liquid due to the sloshing,
A support member that is provided in a gap formed between the plurality of fuel racks and supports the suppression member inserted from above;
A nuclear power generation facility characterized by comprising:

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