JPS6073393A - Supporter for apparatus in reactor - 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 The present invention relates to a tank-type liquid metal fast breeder reactor (LMFBR).
As a support structure for the equipment inside the reactor vessel, the steady slope slope does not generate resistance against gradual thermal displacement in the radial direction, but generates resistance against sudden vibrations in the radial direction during an earthquake. The present invention relates to a support device for a nuclear reactor internal equipment.

Conventionally, support structures for equipment inside a nuclear reactor are shown in FIGS. 1 to 3. In the figure, l is the reactor vessel, 2
3 is the roof slab, 3 is the intermediate heat exchanger in the furnace ai J,
4 is a primary thread pump, 5 is a core support structure, 6 is a core upper mechanism, 7 is an upper plenum, 8 is a partial brenum, 9 is a bulkhead structure, 10 is a reactor core, 11 is an in-core piping, and 12 is a manmade structure. , above core upper part +f￥ 6 is roof slab 2
The reactor core 10 is suspended from the reactor vessel 1 via the core support structure 5, and the coolant exiting the core flows into the high 3 through im: 17i,', lower plenum 8
leaks to.

The cooling side of the first part plenum 8 is sucked into the sub-system pump 4) and sent to the reactor core 10 again through the reactor piping 11.

Here, the partition wall 1:1 part 1
Since the core support structure has a lower plenum temperature of about 11%. Although the lower plenum 8 is at a lower temperature than the upper plenum 7, there is a temperature difference of about 300° C. from the upper surface of the roof slab, which is the installation surface of the intermediate heat exchanger 3 and secondary pump 4.

In the above-described structure, the reactor equipment such as the intermediate heat exchanger 3, secondary pump 4, core upper mechanism 6, long bamboo intermediate heat exchanger 3, and secondary pump 4 are simply connected from the top. In Japan, where earthquake sales are severe, with a suspended T-girder cantilever,
There is no prospect that it will come to fruition.

Therefore, in the past, the intermediate heat exchanger 3 was used as an intermediate heat exchanger.

It is possible to absorb thermal expansion displacement caused by a temperature difference between the upper surface of the roof slab 2 of No. 4 and the intermediate heat exchanger 3 of the core support structure 5 and the secondary system box 14 penetration part, and the intermediate heat exchanger 3 and the secondary system pump 4 can be absorbed. The manometer structure 1275 was considered so that some support effect could be expected at the lower part of the structure.

That is, the manometer structure 12 is as shown in FIGS.
As shown in the figure, if the intermediate heat exchanger 3 force (moves in the direction of the arrow with respect to the partition cylinder 13), the intermediate heat exchanger 3 and
The gap in the x′ force direction of the partition cylinder 13 (111 is a small
The gap in the direction becomes dog-like. Also, since the single heat exchanger 3 and the outer cylinder 14 are integrally constructed, the partition cylinder 13
The gap between the outer cylinder 14 and the outer cylinder 14 are reversed. For this reason, the fluid in the gap between the intermediate heat exchanger 3, the partition cylinder 13, and the outer cylinder 14 moves in the direction of the arrow, and the energy for the movement of the fluid becomes a drag force on the intermediate heat exchanger 3, resulting in a vibration damping effect. is expected.

However, in this system, the intermediate heat exchanger 3
The gap between the partition cylinder 13 and the partition cylinder 13 and the outer cylinder 14 is
Considering the manufacturing and installation accuracy of the intermediate heat exchanger 3 and the thermal expansion displacement due to the temperature difference between the installation part of the intermediate heat exchanger 3 and the penetration part of the core support structure 5 mentioned above, it is thought that approximately 100 mm will be required for each gap. As a result, the flow path area is large and a vibration damping effect cannot be expected to be great.

When the layer 1q is generated, the liquid sodium between the partition cylinder 13 and the outer cylinder 14 passes over the upper end of the partition cylinder 13, enters the gap between the intermediate heat exchanger 3 and the partition cylinder 13, and flows around. )le gas M1 at the top so that no flow path other than
6 is installed, and a system for controlling the pressure of the He gas layer 16 outside the furnace and inside the furnace? rI people need 15 years to live.

On the other hand, in order to eliminate the steady rest at the bottom, it is possible to increase the plate thickness of the furnace equipment and increase its rigidity, but increasing the plate thickness not only increases the amount of object B, but also increases the thermal stress of the second plenum. The structure cannot be established due to the thermal stress caused by the change.

In addition, the manometer structure 12 (ζ) requires a pressure control device for He gas and an introduction pipe into the furnace, but the vibration damping effect is small, so a new structure was created. was strongly desired.

The present invention has been made in response to the above-mentioned demands, and in a tank-type LMFBI reactor equipment support structure, it does not generate resistance against gentle heat in the radial direction, and is capable of suppressing radial damage during an earthquake. Sudden 6)k Vibration ((For which the structure is intended to produce a large drag force.

Hereinafter, all embodiments according to the present invention will be explained in detail based on FIGS. 4 to 7.

4 and 5 are longitudinal sectional views of an intermediate heat exchanger as an in-furnace device showing the first aspect of the present invention, and A-
This is a cross-sectional view taken along the line A. In the figure, 3 is an intermediate heat exchanger as in the conventional example, and 17 is a stand pipe for the intermediate heat exchanger 3, the lower end of which is fixed to a core support structure (not shown). 1
8 is a ball, and 19 is a holding N'? formed in an annular shape on the inner peripheral surface of the stand pipe. , 20a, and 20b are inclined surfaces of the holding groove 19, which intersect with the axial direction and have an upward slope of 45°.

When the intermediate heat exchanger 3 is installed, the ball 18 is located at the lowest end of the retaining groove 19 on the inner peripheral surface of the stand pipe,
It is in contact with the outer peripheral surface of the intermediate heat exchanger 3.

Therefore, after operation of the reactor e) Ball 1
The intermediate heat exchanger 3 is often restrained by being arranged in the retaining groove 19 on the inclined surface 20&.

By appropriately setting the gap between the intermediate heat exchanger 3 and the stand pipe 411 and the diameter of the ball 18, the intermediate heat exchanger 3 and the ball 18 can control the relative displacement in the radial direction between the intermediate heat exchanger 3 and the stand pipe 17. Can be absorbed while in contact.

Further, even when the intermediate heat exchanger 3 is displaced in the vertical direction, the intermediate heat exchanger 3 can be displaced without applying a restraining force to the intermediate heat exchanger 3.

On the other hand, in response to an earthquake input, the ball 18 that has received the load of the intermediate heat exchanger applies a load to the stand pipe 17 via the inclined surfaces 20a and 20b. At this time, the load is transmitted to the stand pipe 17 as a radial load and an axial thrust load, and since the axial rigidity of the stand pipe 17 is sufficiently poor, the intermediate heat exchanger 3 is rigidly supported in its mechanism. Become.

6 and 7 are longitudinal sectional views and BB line sectional views of essential parts showing the second aspect of the present invention, in which 3 is an intermediate heat exchanger, 5 is a core support structure, Reference numeral 17 designates a stand pipe for an intermediate heat exchanger having the holding groove 19 and ball 18 of the first invention shown in FIGS. 4 and 5, but this portion may be constructed of a simple ball or an arcuate spring. 21
a, 21b are submerged dampers '1; 22a, 22b are link mechanisms 23, balls or rollers 24 are holding devices for the balls or rollers 23; 25 are through holes of the intermediate heat exchanger 3 provided in the core support structure 5. .

Note that the core support structure 5 is installed with an inclination of 4 degrees with respect to the axial direction.

When the intermediate heat exchanger 3 is installed, it is inserted into the stand pipe 17 via the ball 18, so that the intermediate heat exchanger 3 and the ball ≠
The 18 sounds of Tegoon are in contact.

Therefore, as the liquid temperature increases after the reactor is operated, the radial position of the axis of the intermediate heat exchanger 3 as seen from the core does not change, but due to thermal expansion of the core support structure 5, the through hole 25
The axis of the intermediate heat exchanger 3 is shifted outward and displaced relative to the axis of the intermediate heat exchanger 3.

The above relative displacement is absorbed by the ball bearing 23 sliding on the upper surface of the core support structure 5 against the guide mechanism 26, and the core support t? The submerged damper 21a is a restraint tf&tM for the structure 5.

21b1 Even in the link mechanisms 22a and 22b, it can be absorbed by the relative movement of the submerged dampers 21a and 21b, and no restraining force is applied to the intermediate heat exchanger 3.

The guide mechanism 26 fixes a rail having a type 2 cross section to the core support structure 5 with bolts 27 .

On the other hand, for earthquake input, from intermediate heat exchanger 3 to ball 1
The load transmitted to the stand pipe 17 via the link mechanism 2 becomes a thrust load in the stand pipe 17.
08→Liquid damper 2 Q a-+20b-IJ link mechanism 20b-core support structure 5, but in response to a fast speed change such as an earthquake, the pressure loss that occurs in the orifice hole of the liquid damper 21b is , submerged damper 21a,
Since it is proportional to the square of the relative speed with respect to 21b, it produces a large drag force, and this mechanism part has a supporting function. Note that the submerged dampers 21a and 21b, and the link mechanism 2
The effects of the mechanisms 2a and 22b will be further enhanced if a plurality of membranes are provided in the circumferential direction.

As explained in detail above, according to the support device for equipment in a nuclear reactor according to the present invention, the first structure is simple, the vibration damping effect is good, and the sudden vibration in the radial direction when the ground N4 is It causes a great deal of resistance to chipping.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing the conventional equipment support structure No. 11;
Fig. 2 is a cross-sectional view showing the conventional manometer structure, Fig. 3 is a vertical 1v + side view of Fig. 2, and Fig. 4 at 21°C is a diagram of a support device for furnace equipment showing the invention of 8p, 1 in the present invention.・Y sectional view, FIG. 5 is a sectional view taken along the line A-A in FIG. )' is a vertical 11 side view, and Figure 7 is a B-B11/1101 view of Figure 6. 3...Intermediate heat exchanger, 5...Core support structure, 17・
... Stand pipe, 18... Ball, 19... Holding groove, 20 a, 20 b... Inclined shaved surface, 21 a
, 2lb-liquid damper, 22a, 22b...
Link (-14, 26...Guide mechanism 'l"# fr
'F Applicant Mitsubishi Atomic Crab Industry Co., Ltd. Agent Patent Attorney Tosa TI Boku Hideaki-) 4-z (i) Zosu Otsu (7ml) Procedural Amendment (Spontaneous) 1 Indication of Case 1980 Patent Application No. 180751 No. 2, Title of the invention Support device for internal reactor equipment 3 Relationship with 41 amendments by applicant % Hariyama Address 1, Shibakoen 2-4ka, Minato-ku, Tokyo Name (Name) (616) Mitsubishi Atomic Crab Industry Co., Ltd. 4, Agent 5 Date of amendment order A, 1 6 Number of inventions increased by amendment Figure 11 Color Q) t127 diagram? Correct the trace on the attached page 7 (
hill

Claims (1)

[Claims] (11) A stand pipe is provided on the outside of the supported body which is the furnace equipment, and an annular holding groove having an upward slope with respect to the axial direction is entirely formed on the inner circumferential surface of the stand pipe, A device for supporting equipment in a nuclear reactor, characterized in that a ball that contacts the supported body is disposed in a holding groove, and the lower end of the stand vibe is fixed to a core support structure. (2) The annular shape having an upward slope. A support device for a 4V vessel in a nuclear reactor according to claim (1), wherein the holding groove has an upward slope of 45 degrees with respect to the axial direction. (3) In-reactor equipment. A stand pipe is provided on the outside of the supported body, and an annular holding groove having an axially facing slope is formed on the inner circumferential surface of the stand pipe, and a ball is placed in the holding groove in contact with the KJI support body. At the same time, the standpipe is arranged on the slope above the core support structure via a holding device n having rolling elements such as balls or rollers at the lower end, and the upper end of the standpipe and the core support structure are connected to each other. A support device for equipment inside a nuclear reactor, which is connected by a submerged damper via an IJ link mechanism. (4) The annular holding groove having an upward slope has an upward slope of 45 mm with respect to the axial direction. A support device for equipment in a nuclear reactor according to claim (3), characterized in that: