JP3505518B2 - Blade guide - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a general boiling water reactor (hereinafter referred to as "BWR") and an improved boiling water reactor (hereinafter referred to as "ABWR") during a system test of a control rod drive system. Alternatively, the present invention relates to a blade guide that can be shared during a fuel loading test.

[0002]

2. Description of the Related Art A blade guide is used to support a control rod blade by loading it in a gap in the core produced after removal of a fuel assembly in the core. The form will be described.

FIG. 5 is an external view of a conventional double-type blade guide, FIG. 6A is a top view of FIG. 6B, and FIG.
FIG. 6 is an elevational view showing a state in which the blade guide of FIG. 5 is installed in a core in a partial vertical section. FIG. 7 (a) is a top view of FIG. 7 (b) viewed from the direction of arrow AA, and FIG. 7 (b) is an elevation view showing a conventional single blade guide in a partial cross section. FIG. 8 is a plan view showing a state in which the conventional double-type blade guide 1 shown in FIG. 5 and the single-type blade guide 13 shown in FIG. 7 are loaded on the core in the reactor pressure vessel.

In the BWR type nuclear power generation facility and the ABWR type nuclear power generation facility, the double type blade guide 1 shown in FIG. 5 and the single type blade guide 13 shown in FIG. 7 are used. The double blade guide 1 shown in FIG. 5 includes a pair of two blade guide bodies 2 and 2 having an outer shape similar to that of the fuel assembly. The pair of blade guide main bodies 2 and 2 are arranged in a diagonal direction and are connected by a connecting plate 3.

The connecting plate 3 is connected to the handle body 7 of the blade guide bodies 2 and 2, and a lifting guide handle 4 is provided above it. The handle body 7 of each blade guide body 2 is provided with a hanging metal piece 5 and an angled guide piece 6 having a right angle inside for guiding the insertion of the fuel assembly.

In FIG. 5, reference numeral 8 indicates a nose provided on the lower portion of the blade guide body 2, and 9 indicates a spacer pad attached to the handle body 7. FIG. 6 (a),
In (b), reference numeral 10 is an upper lattice plate, 11 is a control rod, and 12 is a fuel support fitting.

The blade guide is required during the control rod drive system test and the fuel loading test, which are usually performed during the trial run of the nuclear power plant. That is, at the time of the control rod drive system system test, as shown in FIG. 6A, the fuel assembly is not yet loaded, and there is no support for the control rod 11.

Therefore, for the purpose of preventing the control rod 11 from falling, as shown in FIG. 6 (b), the blade guide 1 is mounted on the cross-shaped cross-shaped control rod 11 in a diagonal line instead of the fuel assembly, and installed. The fall of the control rod 11 is prevented. The blade guide 1 supports the control rod 11 so that it can be moved up and down.

A total of about 200 control rods 11 are arranged in the core. One double type blade guide 1 is used for each control rod 11. As shown in FIG. 6 (b), the fuel assembly is seated and installed on the fuel support metal fitting 12 installed in the lower part of the upper lattice plate 10, so that the double blade guide 1 and the nose 8 are similarly installed. It is seated and installed on the fuel support fitting 12.

FIGS. 7A and 7B show a single blade guide 13 having a shape substantially similar to that of the fuel assembly. That is, in FIG. 7 (b), reference numeral 14 is a square rectangular channel tube, and the tie plate is attached to the upper end of the channel tube 14.
15 is provided, and a handle 16 is attached to the tie plate 15. That is, the nut 17 is fastened to the male screw formed at the lower end of the handle 16 to fix the handle 16 to the tie plate 15. A nose 8 is connected to the lower end of the channel tube 14, and a spacer pad 9 is attached to the tie plate 15.
Is attached.

FIG. 8 is a plan view of the double-type blade guide 1 and the single-type blade guide 13 at the time of the fuel loading test, in which the upper lattice plate 10 of the core in the reactor pressure vessel is loaded and installed, as seen from above. is there.

During the loading test of the fuel assembly, the fuel assembly is initially loaded into the core of the reactor pressure vessel, so that none of the fuel assemblies is empty. . Therefore, instead of the fuel assembly, the double type blade guide 1 and the single type blade guide 13 are loaded and installed on the upper lattice plate 10 as shown in FIG.

In the example of the nuclear power plant shown in FIG. 8, about 50 single blade guides 13 and about 185 double blade guides 1 are installed. With the single blade guide 13, about 420 bodies will be installed. In the conventional nuclear power plant, the main equipment and the temporary equipment are manufactured separately, but the only difference between the main equipment and the temporary equipment is the material.

[0014]

However, if the width and shape of the lattice of the upper lattice plate are changed due to different reactor types of the nuclear reactor, the channel cylinder and type of the blade guide are adjusted so as to correspond to the width and shape. There is a problem that the rate must be reshaped.

Further, for example, Japanese Patent Application Laid-Open No. 3-11179 discloses an example in which an elliptical hole is provided in a tie plate and two single blade guides are connected to be commonly used, but in this example, it is movable. Due to the formula, there is a problem that the interval cannot be set accurately.

Further, an example is known in which the pitch dimension such as the position dimension of the hexagonal bolt for connecting two single type blade guides is changed. In this example, the reactor types are, for example, for BWR type and ABWR type. If they are different, there is a problem that they must be manufactured separately and cannot be shared.

The present invention has been made to solve the above problems, and the shape of the channel tube of the fuel assembly is changed by changing the model of the nuclear power plant, and accordingly, the square lattice width of the upper lattice plate is secondary. It is an object of the present invention to provide a shared blade guide capable of following the shape change of the lattice width of the upper lattice plate even when the shape of the channel cylinder of each fuel assembly is changed.

In addition, the conventional blade guide requires about 400 or more in terms of the number of single blade guides, which makes the overall price expensive. Therefore, it is an object of the present invention to provide a blade guide that can be commonly manufactured by one type of blade guide and can be manufactured at low cost without requiring two types of blade guides even when the types of nuclear reactors are different.

[0019]

The invention according to claim 1 is
It has a square prismatic shape similar in shape to the fuel assembly,
A pair of blade guide bodies with handles
Arrange a pair of blade guide bodies along the diagonal direction
The tie plate that is detachably connected and this tie plate
Near the inside and outside of the body that is the handle receiving part of the
In the bolt holes and the bolt holes that are respectively provided by the side
Screwable bolts and these are provided near the inside
Install between the bolt hole and the bolt hole near the outside.
And a third bolt hole for vertically fixing the handle.
And a bolt screwed into the third bolt hole.
The bolt holes near the inside of the body and the outside of the body.
By selectively screwing the bolts into the bolt holes near the side
From the blade guide body horizontally to the tie plate
It is characterized in that the mounting position of can be selected .

According to the present invention, for example, both the BWR power generation facility and the ABWR power generation facility can be commonly used, and conventionally, it is not necessary to manufacture each blade guide for each nuclear power plant, and a single blade guide is used. Because you can
The overall cost can be reduced and the cost can be reduced. In addition, each system test of power generation facilities of different types, pressure resistance test of the reactor pressure vessel, and blades used during fuel loading can be managed collectively, so that the work load of the worker can be reduced.

According to a second aspect of the present invention, the first bolt hole is a fixing hole for a blade guide body for an improved boiling water reactor, and the second bolt hole is a normal boiling water reactor blade. It is characterized in that it is a hole for fixing the guide body.

According to the present invention, two single-type blade guides are connected at a single tie plate to form a double-type blade guide, the first bolt hole is for ABWR, and the second bolt hole is for example. Select for BWR,
A bolt is screwed into each bolt hole to fix the handle of the blade guide body for ABWR or BWR. ABWR by selecting the position of the bolt hole
Can be shared for BWR and BWR.

The invention according to claim 3 is characterized in that a spacer cap corresponding to a square lattice dimension width of an upper lattice plate installed in a reactor core in a reactor pressure vessel is attached to an upper portion of the blade guide body. .

According to the present invention, the size of the channel cylinder of the selected single-type blade guide is set to the size for ABWR, so that it can be used without distinction for ABWR and BWR. Also, different reactor types can be accommodated by attaching thin spacer caps corresponding to different width dimensions to the upper part of the channel cylinder of the single blade guide. In this case, for the inner dimension of the tie plate, consider the thin spacer cap dimension for the channel tube of each single blade guide.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a blade guide according to the present invention will be described with reference to FIGS. 1 (a), 1 (b) to 4. FIG. 1A is a top view of FIG.
(B) is an elevation view in which the blade guide according to the present embodiment is partially cut away and the left side is shown in a vertical cross section, FIG. 2 is an enlarged view of the upper part of FIG. 1 (b), and FIG. FIG. 4 is an enlarged view of the case of selecting BWR as seen from above the upper lattice plate.

In FIGS. 1 (a) and 1 (b), reference numeral 18 is a blade guide main body, and two blade guide main bodies 18 are paired and fixed on the tie plate 26 in a diagonal direction. The blade guide body 18 has an outer shape similar to that of a fuel assembly loaded in a boiling water reactor.

That is, similar to the single blade guide 13 shown in FIGS. 7A and 7B, a square rectangular channel tube 19 and a tie plate 20 on the upper side of the channel tube 19.
It has a handle 21 and a nose 22 at the bottom. The handle 21 is fixed by a screw 23 at the lower end of the tie plate 20, and a seat 24 for seating on the upper surface of the tie plate 20 is attached. A guide piece 25 is attached to the side surface of the tie plate 20.

The pair of two blade guide bodies 18, 18 have a tie plate 26 as shown in FIG.
Thus, the respective handles 21 are inserted and adjacently fixed. The tie plate 26 is a first body 27a into which the pair of handles 21 and 21 are inserted, a second body 27b, and a first body 27a.
27a and a connecting portion 28 that connects the second body 27b.

A first bolt hole 29 is provided in each of the first and second bodies 27a and 27b in the inner vertical portion where the respective handles 21 and 21 face each other, that is, in the vicinity of the inner strut, and the first bolt hole 29 is provided. A second bolt hole 30 is provided on the outer vertical portion of the handles 21, 21 in the direction opposite to 29, that is, in the vicinity of the outer strut.

The first bolt hole 29 is for ABWR, and when the handle 21 is inserted and fixed in the horizontal direction as shown in FIG. 3, the first bolt 32 is screwed into the first bolt hole 29. The second bolt 33 is not screwed into the second bolt hole 30 and is in a free state. The second bolt hole 30 is for BWR, and when the handle 21 is inserted and fixed in the horizontal direction as shown in FIG. 4, the second bolt hole 30 is inserted into the second bolt 33.
Is screwed in, and the first bolt 32 is not screwed into the first bolt hole 29, but is set in a free state. The third bolt hole 31 is used for fixing the handle 21 in the vertical (vertical) direction, and the third bolt 34 is screwed in to support and fix the handle 21. In addition,
The main handle for tie plate 35 is on the upper surface of tie plate 26.
Is attached.

FIG. 3 shows an example for an ABWR in which a guide blade is inserted from the inside of the upper lattice plate, the first bolt 32 is screwed into the first bolt hole 29, and the handle 21 is fixed to the tie plate 26. FIG. 4 is for BWR and shows an example in which the handle 21 is fixed to the tie plate 26 by screwing the first bolt 33 into the second bolt hole 30.

According to the present embodiment, the first bolt is used as a fixing hole for the blade guide body 18 at a position commensurate with the grid size width of the upper grid plate 10 for BWR and ABWR which is predetermined for the tie plate 26. The holes 29 and the second bolt holes 30 are provided, and either BWR or ABWR can be selected and used for common use, thereby reducing the overall cost.

It is possible to attach a thin spacer cap to the upper end portions of the two blade guide bodies 18 and 18 in accordance with the lattice size width of the upper lattice plate 10. This allows
Even if the furnace type is changed between BWR and ABWR,
Can respond.

Further, by making the dimension of the channel cylinder 19 for ABWR, it can be used without distinction between BWR and ABWR, so that the single type blade guide has a thin shape corresponding to the different width dimension above the channel cylinder. A spacer cap or spacer band can be attached. This allows different reactor types to be accommodated. In this case, the inner dimension of the tie plate needs to consider the dimension of the thin spacer cap or spacer band in the channel tube of each single blade guide.

Further, the blade guide according to the present embodiment can be used in various test runs of BWR type nuclear power generation equipment and ABWR type nuclear power generation equipment. The term "various test runs" used here means a control rod drive mechanism system test, a reactor pressure vessel pressure resistance test, a reactor pressure vessel secondary pressure resistance test, and a fuel loading test.

During the secondary pressure test of the reactor pressure vessel of the BWR type nuclear power generation facility, a blade guide is installed in the reactor in the same manner as above in order to perform steady stop protection against the fluid flow of the nuclear instrumentation facility in the reactor. To use.

During the secondary withstand pressure test of the reactor pressure vessel, it is necessary to operate the reactor recirculation pump to raise the temperature for the withstand pressure test of the reactor pressure vessel, which is used as protection of nuclear instrumentation equipment.

During the control rod drive system test, a blade guide is installed and used in the reactor to support and protect the control rod of the control rod drive equipment in the reactor when the control rod is inserted into the reactor. . Before starting the control rod drive system test, a blade guide is installed in the reactor core instead of the fuel assembly because the test is performed without loading the fuel assembly. Initially, the control rod is fully drawn out and is housed in the control rod guide tube in the furnace, but in the case of the test, the control rod is inserted and moved up and down. Also, in the scrum test, there is a test in which the control rods are inserted all at once, and the blade guide protects at that time as well.

In the case of the loading test of the fuel assembly, the double blade guide or the single blade guide is preloaded in the reactor core, and the control rod is supported by the blade guide and fully inserted. Then, replace the fuel assembly with the blade guide from the inside.

The blade guide according to the present embodiment can be further reduced in weight by removing the corner portion of the tie plate which is conventionally provided in the tie plate, and the manufacturing cost can be greatly reduced.

Since the conventional tie plate has the cornered portion, the fuel assembly comes into contact with the head of the double blade guide or the head of the tie plate when the fuel assembly is loaded.
Therefore, the corners prevent contact. However, due to recent improvements in the operability of the crane and the like, it is possible to deal with this without providing a cornered portion for preventing obstacles in the crane.

[0042]

According to the present invention, it is possible to provide a shared blade guide that can follow the shape change of the upper lattice plate at a low cost when the types of nuclear reactors are different. In addition, it is possible to reduce the work load of the worker by collectively managing the system tests of power generation equipment of different models, the pressure resistance test of the reactor pressure vessel, and the blade guides that can handle the loading of the fuel assemblies.

[Brief description of drawings]

FIG. 1A is a top view for explaining a first embodiment of a blade guide according to the present invention, and FIG. 1B is an elevation view showing the blade of FIG.

FIG. 2 is an enlarged view of a main part in FIG.

3 is a top view of the blade guide of FIG. 1 set for ABWR and viewed from an upper grid plate. FIG.

FIG. 4 is a top view of the blade guide of FIG. 1 set for BWR and viewed from an upper lattice plate.

FIG. 5 is an external view showing a conventional double-type blade guide with a part cut away.

6 (a) is a top view showing a state where the double blade guide of FIG. 2 is inserted into a core, and FIG. 6 (b) is an elevation view showing a part of (a).

FIG. 7A is a top view showing a conventional single blade guide, and FIG. 7B is an elevation view showing the right half of FIG.

FIG. 8 is a plan view showing a state in which a conventional double-type blade guide and a single-type blade guide are loaded on a core in a reactor pressure vessel.

[Explanation of symbols]

1 ... Conventional double type blade guide, 2 ... Blade guide body, 3 ... Connection plate, 4 ... Lifting guide handle,
5 ... Hanging metal fittings, 6 ... Guide piece, 7 ... Handle body, 8,
22 ... Nose, 9 ... Spacer pad, 10 ... Upper lattice plate, 11
... Control rod, 12 ... Fuel support metal fitting, 13 ... Single type blade guide, 14,19 ... Channel tube, 15,20 ... Tie plate, 16,21 ... Handle, 17,23 ... Screw, 18 ... Blade guide body, 24 ... seat, 25 ... guide piece, 26 ... tie plate (present invention), 27a ... first body, 27b ... second body, 28 ... connecting portion, 29 ... first bolt hole, 30 ... second bolt Hole, 31 ... Third bolt hole, 32 ... First bolt, 33 ... Second bolt, 34 ... Third bolt.

Claims (3)

(57) [Claims] 1. A square prismatic tube having an outer shape similar to that of a fuel assembly.
Pair of blade girders each with a handle on the top
Id body and this pair of blade guide bodies
A tie plate that is arranged along the direction and is detachably connected, and the inside of the body that is the handle receiving part of this tie plate
Bolt holes provided near and outside
Bolts that can be screwed into these bolt holes, and bolt holes that are provided near these insides and those that are provided near the outsides
It is installed between the bolt holes, and the handle is moved up and down.
To the third bolt hole that is fixed in the direction
A bolt to be screwed in, and a bolt hole near the inside of the body and an outside of the body.
By selectively screwing the bolts into the adjacent bolt holes
Of the blade guide body to the tie plate
A blade guide characterized in that the mounting position can be selected . 2. The first bolt hole is a fixing hole for an improved boiling water reactor blade guide body, and the second bolt hole is a fixing hole for a normal boiling water reactor blade guide body. The blade guide according to claim 1, wherein 3. The blade according to claim 1, wherein a spacer cap matching the square lattice size width of the upper lattice plate installed in the core of the reactor pressure vessel is attached to the upper portion of the blade guide body. guide.