JPS5885193A - Device for handling reactor instrument of fast breeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a reactor equipment handling device for removing the weir of nuclear reactor equipment such as a control rod drive mechanism of a liquid metal cooled fast breeder reactor.

(2) Technical background of the invention This will be explained with reference to FIG. In the figure, 1 is the reactor vessel of a liquid metal cooled high-grade A44 reactor. A reactor core 2 is housed within this reactor volume aX, and liquid sodium 3 is used as a coolant.
is accommodated.

Incidentally, in the space above the liquid level of the liquid sodium 3, arunone gas is sealed as a gas.

The liquid sodium 3 is configured to flow into the lower part of the reactor volume a1 from the inlet pipe fi4, flow upward within the reactor core 2, and flow out from the outlet pipe 5. And the shield that opens the upper end of this reactor vessel 1! Lug 6f: Core upper machine @r is provided through it. In this upper core mechanism 1, there are provided reactor equipment such as a control rod drive mechanism 8 .

By the way, these nuclear reactor equipment are neutral and should be used for a long time.
The irradiation of the particles makes it radioactive, and the radioactive liquid sodium adheres to it.9 Furthermore, the liquid sodium burns when it comes into contact with air. For this reason, a special handling machine 411 is used when removing the nuclear reactor equipment.

This handling mechanism consists of a main body 10 consisting of a sterilization container with sufficient radiation shielding ability to accommodate the reactor+1 to be handled, and a main body 10 that is installed inside this main body 10 to carry reactor equipment inside this main body 10. Lifting mechanism 1 to lift this body 1
It is composed of a heavy machinery mechanism side door door 12 and a fixed side door door 13 provided at the lower end of the machine. And this fixed side door pal! 13 with a trachea attached to the periphery of the mounting hole of the reactor. After the inside of the main body 10 is surrounded by an inert gas, the fixed side door pal f13 and the handling machine'
The door pulp 12 of the structure 111 is opened, and the reactor equipment is lifted into the main body 10 using the lifting mechanism 11. And the handling machine a side door pal! 12 and fixed side door palzo 13, and the handling machine ill All door palzo! 12 and the fixed side door palzo 13 are disconnected. Then, the removed nuclear reactor machine 4 is sent to a dedicated facility while being housed in the main body 10, where it is inspected and cleaned 4. In addition, the fixed side door PARZO 1.3 is attached to the periphery of the mounting hole of the reactor equipment, and left together.
Seal the temporary mounting holes from which reactor equipment was removed.

By the way, among the above-mentioned nuclear reactor equipment, the control rod drive mechanism 8 attached to the upper core mechanism 7 and the core measurement mechanism are arranged closely at small intervals. For this reason, this handling +1A#! Even if you try to install it on the upper surface of the upper core a14y, the adjacent control pipe #8 and the core measurement mechanism will get in the way, so you can't add more. For this reason,
Conventionally, as shown in FIG.
Install the handling mechanism 9 on top of 5, and this handling mechanism! A guide/gxtt is provided protruding from the bottom surface of blue lub '13 on the fixed side of -
The lower end of this guide tube 16 is connected to the mounting hole 17 of the control rod drive mechanism 8.
The control rod drive mechanism 8 was airtightly mounted on the peripheral edge of the main body 10, and the control rod drive mechanism 8 was lifted into the main body 10 via this guide tube 1σ.

However, if you do it like this, will it be ground SF? When the handling mechanism l digs during this process, a large load acts on the lid body 15, causing the lid body 15 to
There is a risk of damage or oxidation. To prevent this, it is possible to increase the rigidity 1 strength of the KIli lid 15, but this increases the manufacturing cost of the lid 15, and there is a limit to improving the rigidity of the lid 15, so It is not possible to ensure that the handling mechanism 2 is prevented from falling. For this reason, in the past, support rods 20 were constructed from anchors 19 provided on the floor 18 to the top of the handling mechanism 1 to ensure that the mechanism was prevented from overturning.

(3) Complaint ``Support ν light,,i3 J point collection 4@''
When installing the support rod 20... must be attached,
Further, it was necessary to vertically align F4 of the guide 1fie with the mounting hole 17 of the control III drive mechanism 8, etc. while shifting the lid body 15, resulting in extremely low work efficiency.

(4) The purpose of the invention is to provide a reactor equipment handling device that can improve the work efficiency of installation and removal, and can efficiently remove reactor equipment installed in the upper core mechanism.

(5) In the invention, a mounting wall is provided at the upper end of the cylindrical shape, and the upper housing of the core upper machine 14 is attached to the lower edge. A reactor equipment passage hole is formed in the E mounting wall, and the upper shoulder part of the reactor equipment 6 is airtightly mounted on the periphery of the passage hole in the mounting base. An airtight cylinder is installed on the periphery of the mounting hole of the reactor machine, and a door pallet on the throat handling mechanism side is provided at the lower end. A nine-layer mechanism including a fixed side door pulp and a fixed side door pulp is attached to the periphery of the reactor 1dAaI passage hole on the above-mentioned flat top surface.

Therefore, the handling mechanism is attached to the upper housing of the ff1l structure above the core via the mounting base, and this upper housing is shielded! Since it protrudes from the lugs and is structurally strong, there is no possibility that the handling mechanism will swing excessively or fall over in the event of an earthquake.

Therefore, there is no need to support the upper part of the handling mechanism with a support rod or the like as in the past, and installation of the handling mechanism, 4! The outside is easy and the replacement work of reactor equipment becomes more efficient.

(6) An embodiment of the invention This will be explained with reference to FIGS. 2 to 5.

First, the configuration of a liquid metal cooled fast breeder reactor for which this handling device is used will be explained. In the figure, 101 is a reactor vessel, and this reactor vessel 101 houses a reactor core 102 and a coolant, that is, liquid sodium 103. The liquid sodium 103 flows into the lower part of the reactor vessel 101 from the inlet pipe 104, flows upward through the reactor core 102, flows out from the outlet pipe #105, and circulates through an intermediate heat exchanger (not shown). It is composed of Also, the upper end of the reactor vessel 101 is shielded! The space closed by the lug 106 above the surface of the liquid sodium 103 is filled with argon gas as a cover gas.

Also, the above shielding! Core upper mechanism 1 passes through lug 106
0'l is provided. This core upper mechanism Lμ is shielded! It has a joint shell 1071 inserted into the reactor vessel 101 from the upper surface of the lug 106, and an upper noxing 10'lb projecting above the shielding flag 106. and,
Ktd control n rod assembly Ja in this core upper machine fle1or r
411 f O & -.

Nuclear reactor equipment such as a core measurement mechanism (not shown) is provided. The control rod drive mechanism 108 is located inside the reactor vessel 101, and is located above the lower portion 108a, which is likely to be activated, and the shielding flag 106,
The upper part 108b..., which has no possibility of being radiated, is configured so that it can be participle, and the upper part 108b... and the lower part JOJIm... can be separated and removed separately. It is configured.

Next, a description will be given of a reactor equipment pumping device that replaces reactor equipment such as the control rod drive mechanism 10 and the like installed in the upper core machine 5ioy of this nuclear reactor.

In the figure, reference numeral 10p denotes a mounting base, and this mounting base 109 has a cylindrical shape, is structurally strong, and has radiation shielding ability.

The upper end of this mounting base 109 is closed by a mounting wall 110. Also, the diameter of this mounting base 109 is equal to the diameter of the upper housing 10 of the core upper mechanism 102! It is approximately equal to the diameter of b, and the height of the inner surface is 10r.
The control rod drive unit 41110B protruding above b is formed higher than the height of the 0 head, and when this mounting base 109 is installed on top of the upper no.1 housing J#Fb, this mounting base 10# It is configured such that the head of the control rod drive mechanism 108, etc. can be accommodated therein. At the lower edge of this mounting base 109, a 7-run-shaped mounting portion 111 is provided.
is formed, and this deposited portion J7JK is formed with a number of I-seat holes 112 at small and equal pitches.Furthermore, these gel holes are formed on the periphery of the upper housing 101b. 4 holes 113...corresponding to 112...
is formed. This mounting base 10G is placed on the upper housing 101b, and the mounting base 10G is mounted on the above-mentioned mounting 1fB111.
upper housing 107 through gel holes 112...
I seat 114... screwed into the four holes 113... of b.
It is configured to be fixed by. Note that the gel holes 112... and the four holes 113... are arranged in small holes, so when attaching the mounting base 109 to the upper housing 107b, ♂
Match the seat hole 112... and the guide hole 113...
It is configured so that it can be fixed by seats 114...

Further, the mounting wall 110 has a plurality of reactor equipment passage holes 1.
15... are provided. These reactor equipment passage holes 115... are provided at different distances 41 R1+R@rRs from the center of the mount 10m as shown in FIG.
09 relative to the upper housing 1"l 07 bK, one of these reactor equipment passage holes 115... is inserted into the mounting hole 116 of the reactor equipment, such as the control rod drive mechanism 108, in the upper housing 101b. i.e. generally these control rod drive mechanisms 1
011, etc. are arranged along the circumferential line of concentric circles having different diameters. Therefore, the reactor equipment passage holes 115 are located at different distances R1+Rs mm from the center corresponding to each radius of each circumference in which these control rod drive mechanisms 108 are arranged. If the mounting base 109 is rotated when the mounting base 109 is attached, it will be possible to remove any of the reactor equipment passage holes 115... from the control rod drive groove installation holes. 116
can be made to match. In addition, on the inner circumferential surface of each of the reactor equipment passage holes 115 . . .
1x 7 F is formed ◎ti, 118 is a closed cylinder. This sealed cylinder 118 is inserted into the mounting base 109 from above through the reactor equipment passage hole 115.

A flange portion 11 is provided at the upper end of this sealed cylinder 118.
9 is provided. Then, by penetrating this flange portion 119, a plurality of male bolts 12°... are screwed into the stepped portion 111 of the reactor equipment passage hole 115, and by tightening these I bolts 1nto... The seal wJ118 is pressed downward, and the lower end of this system @11& is in close contact with the peripheral edge of the mounting hole 116 of the control rod drive mechanism 1. Seal members are provided between the outer circumferential surface of the upper end of the IM-1 118 and the inner circumferential surface of the reactor equipment passage hole 116, and between the lower four surfaces of the sealed cylinder 118 and the upper surface of the upper housing 101b. 12J.

122 is interposed, and the upper and lower ends of this hermetic cylinder 11g are airtightly attached to the reactor equipment passage hole 115 and the mounting hole 116. In addition, this airtight @x 1 g
The reactor equipment passage holes 115 other than the reactor equipment passage holes 115 to which the reactor equipment passage holes 115 are installed are sealed with plugs 123 as shown in Fig. J15.

A handling mechanism holder 4 is provided on the upper surface of the mounting wall 110 of the mounting base 109 in correspondence with the reactor equipment passage hole 115 described above. 125 is its main body,
It has a cylindrical container shape sufficient to accommodate the reactor equipment being handled, and has airtightness and radiation shielding capabilities. and,
At the upper end of this main body 125, reactor equipment is attached to this main body 12.
A hoisting machine $126 is provided within the unit. Further, at the lower end of this main body 125, a door palzo 1 on the handling mechanism side is provided.
27 and a fixed side door guru f128 are provided. And the Z41 handling mechanism side door Palzo 121 and the fixed side door/arm! 128 is connected by an I seat 129...9, and by removing this I seat 129..., the handling mechanism side door Palzo 121 and the fixed side door/paddle! 12
It is configured to cut 8. These trivial items 4
A door size Luno 12r and fixed side piano doll Luno 128
is a passage hole 1309131 with a diameter equal to the inner diameter of the main body 125.
This passage hole 130.131 is hermetically closed with a cedar valve body 711.111, and the handle 114,
By turning 111, these valve bodies IJ2゜1B
JIf: It is configured so that the sette passage holes JJO and JJJ can be opened by moving 4. Then, the fixed door palfill is set by I site 11g...
It is attached to the top surface of 0. And the installation of Jin
Between J O and the fixed side door handle f J j Ji,
Fixed side door pal fall and mamma door palzo 121
A sealing member 181.13m is interposed at each of the interfaces to maintain airtightness.Next, the operation of this embodiment will be explained. First, you should remove the compost! i Nuclear reactor equipment, for example, the upper part 108b of the control rod drive structure 10-
That is, remove the part that has not been activated. Note that no special equipment is required for this removal work. Next, mounting base 1
09 is the upper part of the core upper mechanism 101...Unong 101b
place it on top, and rotate this mounting base 109,
Any one of the reactor equipment passage holes 115... is aligned with the attachment hole 11σ of the restraining leg rod drive mechanism 108, and the mounting base 101 is fixed to the upper housing 101b by the I-seats 114... Next, this reactor equipment passage hole 1
Insert the sealing cylinder 111 into 1B and fix it with the bolts 12o. And the wall 110 with storage of this mounting stand 109
A handling mechanism 124 is attached corresponding to the upper ff1K reactor equipment passage hole 115. Then, the handling equipment side door Δrutsu 1
21 and fixed side door valve 12g, and lift mechanism 1.
26 grips the lower portion 108a of the control rod drive mechanism 108, and lifts this lower portion 1#8a into the main body 125 through the sealing tube 118, the fixed side door 127, and the handling mechanism side door 127. This fixed side door pulp 128 and handling mechanism side door valve 121
Close the I-seat 129..., disconnect the fixed side door valve 128 and the handling mechanism side door valve 121, and control rod drive mechanism shuttle! The lower part 1081 of the main body 125 is sent to a dedicated repair shop under pressure.

In this case, the handling mechanism 124 is attached to the mounting base 109t-
The handling mechanism 124 is attached to the upper housing 107b of the core upper mechanism 102 through the upper housing 107b, and since this upper housing JO7b is structurally strong, the handling mechanism 124 will not swing excessively or fall over in the event of an earthquake or the like. Therefore, there is no need to support the upper ys of the handling machine 411124 with a support rod or the like as in the conventional case, and the handling mechanism 124 can be easily installed. Moreover, since this handling mechanism 124 is attached to the upper housing 107b via a dedicated mounting base 109, the reactor equipment passage hole 1 is attached to the mounting base 109 in correspondence with the reactor probe.
15... will facilitate alignment. Therefore, removal of reactor equipment, etc. can be carried out efficiently.

In addition, in this embodiment, a plurality of reactor equipment passage holes 115 are provided at different distances from the center of the mounting wall 110 of the mounting base 10, and the mounting base 10m is rotated to allow the passage of the reactor equipment. Since one of the passage holes 115... is made to match the mounting hole 116 of the reactor equipment, the number of reactor equipment passage holes 110... formed in the mounting wall 110 is reduced, simplifying the structure. can do.

(7) Other embodiments of the invention Reactor equipment passage holes may be provided at nine positions corresponding to each reactor equipment.

(8) Effects of the Invention In the present invention, the handling mechanism is attached to the upper part of the structurally rigid upper core mechanism via a mounting base, so there is no possibility that the handling mechanism will swing excessively or fall over in the event of an earthquake or the like. There is no gender. Therefore, there is no need to support the upper part of the handling mechanism with a support rod or the like as in the conventional case, and the installation of this handling mechanism becomes efficient. In addition, since the reactor equipment passage hole is pre-formed in the mounting base, the sealing cylinder and the handling machine groove can be attached in line with the reactor equipment passage hole, making it easy to vertically align them. Therefore, the effects are great, such as being able to efficiently perform work such as removing reactor equipment.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view illustrating the background art. 2 to 5 show an embodiment of the present invention, in which FIG. 2 is an overall longitudinal sectional view, and FIG. 3 is an enlarged longitudinal sectional view of a part of the mounting base and the lower part of the handling mechanism. Figure #I4 is a plan view of the mount, and Figure 5 is a longitudinal sectional view of the mount. 101... Reactor vessel, 102... Reactor core, 107.
- Core upper mechanism, 1orb...upper part, 1 Uzong, 1
0g...control rod drive machine m<reactor machine 75), 109.
-・Mounting base, 11eJ...Mounting wall, 111...Additional part, 115...Reactor equipment passage hole, 116...Mounting hole, 11#...Sealed cylinder, 124...Handling Mechanism, 12
7... Handling mechanism a door valve, 128... Fixed side door valve. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) A mounting base that is cylindrical in shape, has a mounting wall that closes off the upper layer, and has a table mounting part on the lower edge that can be attached and detached to the peripheral edge of the upper housing of the upper core mechanism, and this mounting base. The above-mentioned reporting wall t - a reactor equipment passage hole provided through the above-mentioned mount; The sealing space is airtightly installed around the periphery of the mounting hole of the reactor equipment installed in the housing, and the lower 4 parts have a handling mechanism side door valve and a fixed side door pulp, and the upper ml of the mounting wall of the above mounting base. A reactor machine aha device for a fast breeder reactor, characterized in that it is equipped with a handling mechanism that is attached to the peripheral edge of a hole with a reactor machine a* with an air passage. (2) A plurality of the reactor equipment passage holes are installed in the upper core mechanism and are provided at different distances from the center of the mount corresponding to the arrangement of nine reactor equipment, and the mount is installed in the upper part of the reactor core. The reactor equipment handling device for a high 1 breeder reactor according to claim 1, characterized in that it is capable of being deposited at any rotational position with respect to the upper housing of the mechanism.