JPH0252288A - Tank type 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 [Objective of the Invention] (Industrial Application Field) The present invention relates to a tank-type fast breeder having an in-reactor partition structure for dividing a reactor vessel into a pool and a cold pool. Regarding furnaces.

(Prior Art) The configuration of a conventional tank-type fast breeder reactor is shown in FIG. In this figure, the low-temperature reactor 2 housed in the main vessel (reactor vessel) 1 is pumped into the pressure plenum 4 by the main circulation pump 3.
The fuel is pumped through the reactor core 5, which generates heat due to nuclear reactions, and is heated to a high temperature. This high temperature sodium 6 passes through an intermediate heat exchanger 7 and is cooled down to a low temperature again.

The high temperature chamber 6 and the low temperature chamber 1 through 2 are separated and insulated by a conical redundant 8 and a toroidal redundant 9 installed in the main container 1. Since these conical redundant 8 and toroidal redundant 9 have a temperature difference during steady state and during thermal transient, a thermal expansion difference occurs with respect to the main container 1. In order to absorb this difference in thermal expansion, Loidal Redan 1 to 9 have a structure with a large curvature, and have a mechanism that absorbs the difference in thermal expansion between the core side joint end and the main vessel side joint end by bending. On the other hand, the conical redundant 8 is fixed to the outer periphery of the upper end of the core only on the core side, and has a free end on the main vessel side to escape thermal expansion.

(Problems that the invention is unlikely to solve) In the conventional tank-type fast breeder reactor configured as described above, when vertical and horizontal acceleration due to an earthquake is applied, the conical rethane 8 is placed in one reactor core. Since it is supported only by the outer periphery of the end, horizontal J3 and vertical vibrations occur using that as a support point, and there is a possibility that a large bending stress may be generated especially near the fixed end.

The present invention has been made in consideration of the circumstances listed below, and it is possible to suppress the stress generated during an earthquake, which causes large deformation even during an earthquake, and to easily absorb the difference in thermal expansion during reactor operation. The object of the present invention is to provide a tank-type fast breeder reactor having a coninolyl mononotane structure that can be used in conjunction with a tank-type fast breeder reactor.

[Structure of the invention] (Means for determining the problem M) A tank-type fast breeder reactor according to the present invention has helium stored in a reactor vessel, helium on one side, and low-temperature helium on the lower side.
In a tank-type fast breeder reactor that uses nical and troital rethanes,
``-Recorded on the shoulders of the two-legged reredan is 1~roidal retan'', the stud pole 1~ is installed in the cover gas space on the upright pump stand pipe J3 and the cassdam wall extending from the inner wall of the reactor vessel.
The reactor core side end is a free end that is not fixed to the reactor core.

(Function) In the tank-type fast breeder reactor configured in this way,
Even when acceleration due to an earthquake is applied in the horizontal J3 and -1 downward directions, the conical rhethane is supported with sufficient rigidity, preventing large local deformations, and pump stand pipes. The fixing points of Statpol 1 to the gas dam wall are in the cover gas where severe thermal transients are not applied, so the thermal stress caused by the discontinuous drawing is suppressed to a small level, and structural soundness 1g is ensured.

(Example) An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a support structure for a conical redundant in an embodiment of a tank-type fast breeder reactor according to the present invention. 4i: Since the overall configuration of the tank-type high-speed jQ+furnace is the same as that shown in FIG. 4, the same parts are given the same reference numerals and a detailed explanation will be omitted.

In FIG. 1, a gas dam wall 11 is coupled to the inner wall of the main container 1, and the gas dam wall 11 extends upward along the wall surface of the main container 1. 1~ From the upper part of the roidal redan 9, there is a stand pipe 12 along the main W-ring pump 3.
” extends upright on three sides and terminates in the cavagas space.

Conical retan 8△ is stud pol 1 to 13.1 in the cover gas space on the gas dam wall 11 and J, and the stand vibe 12.
4, and is suspended and supported. The core-side end of the conical rethane 8Δ is connected to the core 5 to form a free end.

FIG. 2 is a sectional view of the entire nuclear reactor structure taken along the line ■-■ in FIG. 1. J shown in this figure: Uni, stud port t13, 1/4 supporting conical urethane 8△
are arranged as uniformly as possible in the circumferential direction. In addition, the sliding stud bolt 14 that connects and covers the Nicalrethane 8△ to the stand vibe 12 is shown in Fig. 3 (△) d'.
3 and (13), the main container has a sliding mechanism in the radial direction to absorb the difference in thermal expansion. That is,
A stud 16 is welded and fixed to the stand vibe 12, and a conical urethane 8 is attached to the stud 16 by means of poles 1 and 17.
△ is fixed. A long hole 18 is formed in the conical rethane 8Δ in the radial direction of the main container 1 to absorb the difference in thermal expansion relative to the stand vibe. Note that the stud poles 1 to 13 for fixing the Nikal Redan 8Δ to the Gastam wall 11 are fixed stud poles i- that do not have a sliding mechanism.

Next, the operation of the above embodiment will be explained.

In the event of a horizontal earthquake, the conical rethane 8A is supported by stud poles 1 to 13 on the main container side and stud poles 1 to 14 on the pump stand pipe 12 side other than those installed at right angles to the excitation direction. , all stud pols l-13 in the event of a vertical earthquake.

J: is supported by 14. Further, the relative thermal expansion difference between the conical rethane 8A and the pump stand pipe 12 in the diametrical direction of the main container is absorbed by the sliding stud poles 1 to 14.

As described above, the above embodiment provides a 7-type fast breeder reactor that has a conical urethane structure that does not undergo large deformation and localized excessive stress even during horizontal and vertical earthquakes. can do. Further, by disposing the stud bolts 13.14 for fixing the conical rethane in the cover gas, the structural soundness of the stud bolts 1 to 13.14 and their installation portions during thermal transients is ensured.

〔Effect of the invention〕

In the tank-type fast breeder reactor according to the present invention, the conical rethane is fixed to the stud pole 1 in the cover gas space to the pump stand pipe that stands upright in the toroidal redundant and the gas dam wall extending from the inner wall of the reactor vessel, while the conical rethane core Because the side ends are free ends that are not fixed to the reactor core, the conical urethane 4F4 structure does not cause large deformation even during earthquakes, reduces generated stress, and can easily absorb thermal expansion during reactor operation. right η
A tank-type fast breeder reactor can be provided.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a support structure for a tank-type fast breeder reactor according to an embodiment of the present invention (a cross-sectional view showing a support structure for a conical urethane;
The figure is a sectional view of the entire reactor structure taken along line m-n in FIG. 1, FIG.
B) is a cross-sectional view taken along the line ■--■ in FIG. 3 (Δ), and FIG. 4 is a cross-sectional view showing a conventional tank-type fast breeder reactor. 1...Main container, 2...Low temperature 1~lium, 3...
Main circulation pump, 4...pressure blennium, 5...core,
6...High humidity sodium, 7...Intermediate heat exchanger, 8△
...conical redan, 9...1~roidal redan,
11... Gas dam wall, 12... Stand pipe, 1
3.14... Stud Pol 1~. (A) (B) ^-One funeral map

Claims (1)

[Claims] In a tank-type fast breeder reactor that has a conical redundant and a toroidal redundant that separate and insulate the upper high-humidity sodium and the lower low-temperature sodium stored in the reactor vessel, the conical redundant is a pump stand pipe that stands upright from the toroidal redundant. and a tank-type fast breeder reactor, characterized in that it is fixed to a gas dam wall extending from the inner wall of the reactor vessel with stud bolts in a cover gas space, while the reactor core side end is a free end that is not fixed to the reactor core.