JP5567890B2 - Reactor cable penetration equipment - Google Patents

Description

  Embodiments described herein relate generally to a cable penetration device for holding a cable module through a containment vessel and a shielding wall of a nuclear reactor.

  As shown in FIG. 15, the cable penetrating the containment vessel and the shielding wall of the nuclear reactor is held by a cable penetration device 1 that forms a pressure boundary (see, for example, Patent Document 1 below).

  The structure of the cable penetration device 1 will be described in detail. A sleeve 4 as a nozzle is passed through the reactor containment vessel 2 and the shielding wall 3, and the sleeve 4 protrudes outward from the shielding wall 3. A header ring 6 is attached to the portion via an adapter 5, and a plurality of cable modules 7 are attached to the header ring 6.

  Further, one end of each cable 8 constituting the cable module 7 is connected to the external cable 11 via a terminal portion 10 held in the terminal box 9.

  Similarly, an installation flange 12 is attached to a portion of the sleeve 4 that protrudes inside the reactor containment vessel 2, and a terminal box 13 is held on the installation flange 12.

  In the terminal box 13, the other end of each cable 8 is connected to the internal cable 15 via the terminal portion 14.

  On the other hand, inside the sleeve 4, a cable holding portion including a plurality of supports 17 a, 17 b, 17 c connected by support rods 16 a, 16 b, 16 c and covers 18 a, 18 b, 18 c is disposed.

  Each cable 8 of the cable module 7 is inserted and held in each support 17a, 17b, and 17c.

  An end shell 19 is provided at the tip of the cover 18c closest to the inside of the storage container 2, and is centered with respect to the sleeve 4 by a bolt 20 or the like.

  When installing the cable penetration device 1, it is necessary to sequentially assemble a plurality of support rods 16, the support 17, and the cover 18 in a narrow work space.

  This assembly operation will be described with reference to FIG. 16. A mounting flange 12 is attached to a portion of the sleeve 4 that protrudes inside the reactor containment vessel 2, and a portion that protrudes outside the shielding wall 3 A header ring 6 is attached via an adapter 5.

  Then, as shown in FIG. 16 (a), the support rod 16 a, the supports 17 a and 17 b and the cover 18 are assembled inside the reactor containment vessel 2 and inserted from the opening 4 a of the sleeve 4.

  Then, the support rod 16b and the support 17c are connected to the support 17b, and the cover 18b is attached and inserted into the sleeve 4.

  Next, as shown in FIG. 16B, after connecting the support rod 16c and the support 17d to the support 17c, the cover 18c is mounted and inserted into the sleeve 4.

  Thereafter, the end shell 19 is attached to the support 17d, inserted into the sleeve 4, and fixed to the installation flange 12 using bolts 20 or the like.

JP 2004-157050 A

  However, the conventional cable penetration apparatus 1 has to carry out an assembly operation inside the reactor containment vessel 2 as described above.

  Accordingly, there is a need for a cable penetration device that can be assembled efficiently in a short time at a location where the radiation dose outside the reactor containment vessel and the shielding wall is low.

One embodiment of a cable penetration device for a nuclear reactor that solves the above problems is as follows.
A cylindrical sleeve extending through the reactor containment vessel and the shielding wall;
An installation flange fixed to an inner opening inside the reactor containment vessel of the sleeve;
A header ring fixed to an outer opening outside the shielding wall of the sleeve via an adapter;
An end shell inserted into the sleeve;
A predetermined number of cover modules connected to the rear end of the end shell and integrally inserted into the sleeve;
A header shell connected to the rear end of the cover module;
The end shell is first inserted from the outer opening of the sleeve, and the predetermined number of cover modules are sequentially connected and integrated into the rear end of the end shell, and then inserted into the sleeve, and then the cover module. The header shell is connected to the rear end of the sleeve and inserted into the sleeve, and the header ring can be fixed to the outer opening of the sleeve via the adapter.

In addition, in the cable penetration device of the nuclear reactor of one embodiment,
Additional fixing means for fixing the end shell to the flange may be provided to fix the predetermined number of cover modules to the sleeve in an axially and circumferentially undisplaceable manner.

  At this time, the fixing means may include a key provided on one of the flange and the end shell, and a key groove provided on either the flange or the end shell for receiving the key. it can.

  The keyway may have a first portion that extends in the axial direction of the sleeve and a second portion that is connected to the first portion and extends in the circumferential direction of the sleeve.

  In addition, the key groove can be formed in a rectangular shape extending with a predetermined width toward the outer opening of the sleeve, and the key can be formed in a tapered shape that tapers toward the outer opening of the sleeve.

  Alternatively, the key groove may be formed in a tapered shape toward the outer opening of the sleeve, and the key may be formed in a rectangular shape extending with a predetermined width toward the outer opening of the sleeve.

  Further, the fixing means includes a fixing flange that is fixed to the front end of the end shell in a state in which the end shell protrudes from the inner opening of the sleeve to the inside of the reactor containment vessel and faces the flange in the axial direction. A protrusion projecting from one of the flange and the fixing flange and extending in the axial direction; and a receiving recess recessed in the other of the flange and the fixing flange to receive the protrusion. Can be configured.

1 is an overall side cross-sectional view illustrating a cable penetration device according to an embodiment. Sectional drawing which shows the installation procedure of the cable penetration apparatus shown in FIG. Sectional drawing which shows the installation procedure of the cable penetration apparatus shown in FIG. Sectional drawing which shows the installation procedure of the cable penetration apparatus shown in FIG. Sectional drawing which shows the installation procedure of the cable penetration apparatus shown in FIG. The front view which shows the fixing means of 1st Example. Sectional drawing which shows the fixing means shown in FIG. 6, and its modification. Sectional drawing and side view which show the fixing means of 2nd Example. The front view which shows the fixing means of 3rd Example. The principal part enlarged view of FIG. The vertical sectional view (a) and horizontal sectional view (b) which show the fixing means shown in FIG. Sectional drawing which shows the fixing means of 4th Example. The front view which shows the installation flange shown in FIG. Sectional drawing which shows the action | operation of the fixing means of 4th Example. The whole side sectional view showing the conventional cable penetration device. The figure which shows the installation procedure of the cable penetration apparatus shown in FIG.

  Hereinafter, with reference to FIGS. 1-13, the cable penetration apparatus of one Embodiment is demonstrated in detail. In the following description, the direction from the outside of the shielding wall 3 toward the inside of the reactor containment vessel 2 is defined as the front, and the opposite direction is defined as the rear. In addition, the same reference numerals are used for the same parts as those of the above-described conventional technology, and a duplicate description is omitted.

  First, with reference to FIGS. 1 to 5, the structure of the cable penetration device 100 according to the first embodiment and the assembly work thereof will be described.

  Referring to FIG. 1, a cable penetration device 100 according to an embodiment includes a cylindrical sleeve 4 that extends through a reactor containment vessel 2 and a shielding wall 3.

  And the installation flange 12 is being fixed to the outer periphery of the opening 4a located inside the reactor containment vessel 2 among this sleeve 4 by welding.

  An adapter 5 is connected to the opening 4b of the sleeve 4 outside the shielding wall by butt welding, and a header ring 6 is fixed to the rear end of the adapter 5 by welding.

  Inside the sleeve 4 are an end shell 31, a predetermined number of cover modules 32, 33, 34 connected to the rear end of the end shell 31, and a header connected to the rear ends of these cover modules. A shell 35 is inserted.

  The cover modules 32, 33, and 34 have a cylindrical structure in which a split cover is fixed to the outer peripheral surface of the disk-shaped cable support and cover ring.

  Further, a support unit 37 connected to the header ring 6 by a support rod 36 is inserted into a portion where the sleeve 4 and the adapter 5 are connected.

  The support unit 37 has a cylindrical structure in which two disk-shaped supports are connected by a support rod, and a split cover is fixed to the outer peripheral surface thereof.

  Each cable 8 of the cable module 7 is inserted and held in the disk-shaped cable support and cover ring constituting the cover modules 32, 33, and 34 and the two disk-shaped supports constituting the support unit 37. ing.

  By the way, when assembling the cable penetration device 100, as shown in FIG. 2, the installation flange 12 is pre-welded to the inner opening 4a of the sleeve 4 extending through the reactor containment vessel 2 and the shielding wall 3. deep.

  Then, the end shell 31 is first inserted into the sleeve 4 from the outer opening 4 b of the sleeve 4, and the first cover module 32 is connected to the rear end of the end shell 31 and inserted into the sleeve 4. .

  Next, as shown in FIG. 3, the second cover module 33 is connected to the rear end of the first cover module 32 and inserted into the sleeve 4, and the second cover module 33 is inserted into the rear end of the second cover module 33. 3 cover modules 34 are connected and inserted into the sleeve 4.

  Then, the end shell 35 is connected to the rear end of the third cover module 34 and inserted into the sleeve 4.

  Further, as shown in FIG. 4, the end shell 31 is fixed to the installation flange 12 by using a fixing means 40 described later.

  At the same time, the header shell 35 is fixed to the inner peripheral surface of the sleeve 4 with a bolt or the like (not shown).

  As a result, the end shell 31, the first to third cover modules 32, 33, 34 and the header shell 35 are fixed to the sleeve 4 in an integrally connected state, and are axially and circumferentially relative to the sleeve 4. Relative displacement is not possible.

  Next, as shown in FIG. 5, the outer opening 4b of the sleeve 4 and the adapter 5 are held coaxially and butt welded.

  Then, after the support unit 37 connected to the header ring 6 by the support rod 36 is inserted into the adapter 5, the header ring 6 is welded and fixed to the opening portion of the adapter 5.

  That is, in the cable penetration device 100 of this embodiment, the end shell 31, the cover modules 32, 33, 34 and the header shell 35 are sequentially inserted into the inside from the outer opening 4 b of the sleeve 4, and the adapter 5 is welded to the sleeve 4. Then, after the support unit 37 is inserted therein and the header ring 6 is welded and fixed to the adapter 5, each cable module 7 is inserted and held.

  As a result, most of the assembly work of the cable penetration device 100 of the present embodiment can be performed efficiently in a place with a low radiation dose outside the reactor containment vessel 2 and the shielding wall 3.

  Next, each embodiment of the fixing means for fixing the above-described end shell 31 to the installation flange 12 will be described with reference to FIGS.

First Embodiment The fixing means 40 shown in FIGS. 6 and 7A has a structure in which the end shell 31 is fixed to the installation flange 12 using a key 41.

  More specifically, a key groove 12a extending in the axial direction of the sleeve 4 is recessed in the inner peripheral surface of the installation flange 12, a key 31a extending in the axial direction of the sleeve 4 is provided in the outer peripheral surface of the end shell 31, and A rectangular parallelepiped key 41 inserted into both the key grooves 12 a and 31 a is fixed to the end shell 31 by a bolt 42.

  As a result, the end shell 31, the cover modules 32, 33, 34 and the header shell 35 cannot be relatively displaced axially rearward toward the outer opening 4 b of the sleeve 4, and the circumference of the sleeve 4 is The relative displacement in the direction is also impossible.

  Note that the attachment of the key 41 and the fixing of the key 41 with the bolt 42 can be completed within a short time inside the reactor containment vessel 2.

  Further, as in the modification shown in FIG. 7B, the end shell 31, the cover modules 32, 33, and 34 and the header shell 35 are fixed by fixing the contact plate 43 to the front surface of the installation flange 12 with bolts 44. It can be fixed so as not to be relatively displaced forward in the axial direction toward the inside of the reactor containment vessel 2.

  That is, according to the fixing means 40 of the first embodiment, the end shell 31, the cover modules 32, 33, 34, and the header shell 35 are connected to the sleeve by a simple operation of attaching the key 41 to the installation flange 12 and the end shell 31. 4 can be securely fixed so as not to be relatively displaced in the axial direction and circumferential direction with respect to 4.

Second Embodiment The fixing means 50 shown in FIG. 8 (a) is a combination of a key and a key groove, similar to the fixing means 40 of the first embodiment described above. The shape of the keyway 51 to be recessed is different.

  More specifically, the key groove 51 provided in the inner peripheral surface of the installation flange 12 is L-shaped as shown in FIG. 8B when viewed from the direction of arrow B in FIG. The sleeve 51 has a portion 51 a extending in the axial direction and a portion 51 b extending in the circumferential direction of the sleeve 4.

  Further, in the key groove 52 that is recessed in the outer peripheral surface of the end shell 31 and extends in the axial direction of the sleeve 4, a rectangular parallelepiped key 53 smaller than that in the first embodiment is fitted and fixed by a bolt 54. Has been.

  Thus, after the key 53 is attached to the end shell 31, the end shell 31, the cover modules 32, 33, 34 and the header shell 35 are moved together in the axial direction of the sleeve 4. Of these, it moves inside the portion 51a extending in the axial direction and contacts the bottom wall 51c.

  Next, when the end shell 31, the cover modules 32, 33, 34, and the header shell 35 are integrally rotated with respect to the sleeve 4 in the circumferential direction, the key 53 is a portion 51b of the key groove 51 that extends in the circumferential direction. And abuts against the bottom wall 51d.

  Then, since the key 53 enters the inner part of the key groove 51, the end shell 31, the cover modules 32, 33, 34 and the header shell 35 can no longer be relatively displaced in the axial direction of the sleeve 4.

  The end shell 31, the cover modules 32, 33, and 34 and the header shell 35 are attached to the sleeve 4 by inserting and fixing a not-shown abutting plate into the axially extending portion 51 a of the key groove 51. It can be fixed so as not to be relatively displaced integrally in the circumferential direction.

  That is, according to the fixing means 50 of the second embodiment, after the end shell 31, the cover modules 32, 33, 34 and the header shell 35 are integrally moved toward the rear in the axial direction of the sleeve 4, the sleeve 4 The end shell 31 can be securely fixed to the installation flange by a simple operation of rotating integrally in the circumferential direction.

Third Embodiment The fixing means 60 shown in FIGS. 9 to 11 is a combination of a key and a key groove in the same manner as the fixing means 40 of the first embodiment described above. Is different.

  More specifically, the three keys 61 fixed to the inner peripheral surface of the installation flange 12 are triangular columnar members that extend in the axial direction of the sleeve 4.

  Further, the three keys 61 are fitted into a recessed groove 62 formed in the inner peripheral surface of the installation flange 12, and as shown in FIG. 9, the corner portion 61 a faces the center of the installation flange 12, They are arranged at equal intervals in the circumferential direction so as to be point-symmetric with respect to the center of the installation flange 12.

  Further, the key groove 63 formed in the end shell 31 has a tapered shape that spreads toward the inside of the reactor containment vessel 2 as clearly shown in FIG.

  As a result, when the assembly of the end shell 31, the cover modules 32, 33, 34, and the header shell 35 is completed, they are integrally formed in the end shell 31 by moving them in the axial direction toward the installation flange 12. Each key 61 is inserted into each key groove 63.

  When the left and right inner wall surfaces 63a, 63b of each key groove 63 come into contact with the ridge lines 61b, 61c on the rear end side of each key 61, the end shell 31, the cover modules 32, 33, 34 and the header shell 35 are As a result, it cannot move forward in the axial direction and is positioned in the axial direction.

  Further, since the left and right upper corners 63c and 63d of each key groove 63 abut on the left and right inclined surfaces 61d and 61e of each key 61, the end shell 31 is coaxially aligned with the installation flange 12.

  This eliminates the need to use bolts 20 or the like for holding the end shell 31 coaxially with the installation flange 12 as shown in FIG.

  That is, according to the fixing means 60 of the third embodiment, the end shell 31, the cover modules 32, 33, and 34 and the header shell 35 are moved integrally in the axial direction toward the inside of the reactor containment vessel. Both the operation of positioning in the axial direction relative to the sleeve 4 and the operation of centering coaxially can be performed simultaneously.

  Further, by fixing the header shell 35 to the inner peripheral surface of the sleeve 4 using bolts or pins, the end shell 31, the cover modules 32, 33, 34 and the header shell 35 are not relatively displaced inside the sleeve 4. It can be fixed to the unit.

  In the third embodiment, the three keys 61 are formed in a triangular prism shape, and the three key grooves 63 are formed in a tapered shape that widens toward the front in the axial direction of the sleeve 4.

  On the other hand, the three keys 61 can be formed in a tapered shape that tapers toward the rear in the axial direction of the sleeve 4, and the key groove 63 can be formed to have a constant width.

  Further, the number of the keys 61 and the key grooves 63 is not limited to three, but may be four or more.

Fourth Embodiment The fixing means 70 shown in FIGS. 12 to 14 uses a fixing flange 71 fixed to the front end of the end shell 31.

  More specifically, after the end shell 31, the cover modules 32, 33, and 34 and the header shell 35 are integrally assembled in the sleeve 4, the reactor 4 is opened from the inner opening 4a of the sleeve 4 as shown in FIG. With the end shell 31 protruding inside the containment vessel 2, a fixing flange 71 is fitted on the outer periphery of the end shell 31 and welded together.

  At this time, four conical protrusions 72 are arranged on the back surface 71 a of the fixing flange 71 so as to protrude in the circumferential direction at equal intervals and in the axial direction of the sleeve 4.

  Further, on the front surface of the installation flange 12, conical back portions 73 that receive the conical protrusions 72 are recessed at equal intervals in the circumferential direction.

  Accordingly, when the end shell 31, the cover modules 32, 33, 34 and the header shell 35 are integrally retracted in the axial direction inside the sleeve 4, the conical protrusions 72 are fitted into the conical back portions 73. The end shell 31 is coaxially aligned with the installation flange 12 and is fixed so as not to be displaced relative to the sleeve 4 in the circumferential direction.

  At the same time, since the rear surface of the fixing flange 71 is in close contact with the front surface of the installation flange 12, the end shell 31, the cover modules 32, 33, 34 and the header shell 35 are integrally positioned in the axial direction inside the sleeve 4.

  Further, when the header shell 35 is fixed to the inner peripheral surface of the sleeve 4 with a bolt or the like, the end shell 31, the cover modules 32, 33, 34 and the header shell 35 are integrated so as not to be relatively displaced inside the sleeve 4. Can be fixed to.

  That is, according to the fixing means 70 of the fourth embodiment, it is ensured that the end shell 31, the cover modules 32, 33, 34, and the header shell 35 are not displaced relative to the sleeve 4 in the axially rearward and circumferential directions. The end shell 31 can be coaxially aligned with the installation flange 12 while being fixed to the mounting flange 12.

  The cable penetration device according to the embodiment has been described in detail above, but it goes without saying that various modifications can be made to the cable penetration device.

  For example, the above-described cable penetration device includes the three cover modules 32, 33, and 34, but the number thereof is not limited to three, and can be changed as appropriate according to the total length of the sleeve 4.

DESCRIPTION OF SYMBOLS 1 Conventional cable penetration apparatus 2 Reactor containment vessel 3 Shielding wall 4 Sleeve 4a Inner opening 4b Outer opening 5 Adapter 6 Header ring 7 Cable module 8 Cable 12 Installation flange 16 Support rod 17 Support 18 Cover 19 End shell 31 End shell 32, 33, 34 Cover module 35 Header shell 40 Fixing means of the first embodiment 41 Key 50 Fixing means of the second embodiment 51 Key groove 53 Key 60 Fixing means of the third embodiment 61 Key 63 Key groove 70 of the fourth embodiment Fixing means 71 Fixing flange 72 Protruding part 73 Concave part 100 Cable penetration device of one embodiment

Claims (7)

A cylindrical sleeve extending through the reactor containment vessel and the shielding wall;
An installation flange fixed to an inner opening inside the reactor containment vessel of the sleeve;
A header ring fixed to an outer opening outside the shielding wall of the sleeve via an adapter;
An end shell inserted into the sleeve;
A predetermined number of cover modules connected to the rear end of the end shell and integrally inserted into the sleeve;
A header shell connected to the rear end of the cover module;
The end shell is first inserted from the outer opening of the sleeve, and the predetermined number of cover modules are sequentially connected and integrated into the rear end of the end shell, and then inserted into the sleeve, and then the cover module. A cable penetration device, wherein the header shell is connected to a rear end of the sleeve and inserted into the sleeve, and the header ring can be fixed to the outer opening of the sleeve via the adapter. .   The fixing means for fixing the end shell to the installation flange to fix the predetermined number of cover modules to the sleeve in an axially and circumferentially undisplaceable manner. The cable penetration apparatus described in 1.   The fixing means includes a key provided on one of the installation flange and the end shell, and a key groove provided on the other of the flange and the end shell for receiving the key. 3. A cable penetration device according to claim 2, wherein   The keyway has a first portion extending in the axial direction of the sleeve, and a second portion extending in the circumferential direction of the sleeve so as to be connected to the first portion. The cable penetration device according to claim 3.   The keyway is formed in a rectangular shape extending with a predetermined width toward the outer opening of the sleeve, and the key is formed in a tapered shape tapered toward the outer opening of the sleeve. Item 4. The cable penetration device according to Item 3.   The key groove is formed in a tapered shape toward the outer opening of the sleeve, and the key is formed in a rectangular shape extending with a predetermined width toward the outer opening of the sleeve. Item 4. The cable penetration device according to Item 3. The fixing means includes
A fixing flange which is fixed to the front end of the end shell in a state where the end shell protrudes from the inner opening of the sleeve to the inside of the reactor containment vessel and faces the installation flange in the axial direction;
A projecting portion projecting from one of the installation flange and the fixing flange and extending in the axial direction;
3. The cable penetration device according to claim 2, further comprising a receiving recess that is recessed in either one of the installation flange and the fixing flange to receive the protrusion.

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