JPS6039590A - Holder for core constitutional element - 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] [Technical Field of the Invention] The present invention provides a method for preventing core components from floating even if a sudden vertical force is applied to the reactor core during an earthquake or the like in a tank-type nuclear reactor.
This invention relates to a holding device for core components that can prevent damage.

[Problems with the technical burden of the invention] Each core component that makes up the reactor core is constantly subjected to an upward LF pressure load by the flowing coolant, and vertical loads may occur during earthquakes, etc. If this happens, the core components will float up.

Conventionally, in order to prevent such floating, a bottom pressure plenum was provided below the lower fitting part of the engine lance nozzle of the core components and modules, and the pressure difference between the upper and lower parts of the lower part was used to Reduces upward pressure load and reduces own weight,
Pressure loads and ll! A so-called Hyde rick holddown method is used to balance the seismic loads.

However, in recent years, as research into TTL of tank-type nuclear reactors has progressed, it has come to be expected that the vertical response acceleration to the reactor core will exceed 1G. It has become clear that there is a danger that 1F cannot sufficiently prevent the core from surfacing.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and can reliably prevent the core components from floating even in the case of a vertical earthquake where a large response acceleration is applied to the reactor core. An object of the present invention is to provide a holding device for core components that can easily be replaced when necessary.

F Summary of the Invention] That is, the present invention provides a core component holding device that holds an entrance nozzle of a core component in a connecting pipe, including a latch rod rotatably disposed within the core component, and a latch rod that is rotatably disposed within the core component. Latch plates 1 to 1 are provided with coolant flow holes arranged at the lower end and have grooves for delatching at several places on the circumferential surface, and corresponding to the grooves for delatching at several places on the circumferential surface of the En-1 Herance nozzle. 1. A holding device for a core component, comprising: a notch provided through the connecting pipe; and a latch member inserted into the notch and engaged with a latch groove formed in the connecting pipe. .

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows the schematic configuration of the reactor, with reactor vessel 1
Inside there are many core components 2, such as fuel 11, and a core tank 3.
, a core support plate 4, a support structure 5, a reactor vessel inner cylinder 6, and the like are housed therein, and the upper end is shielded by a rotary plug 8 and a fixed plug 9 having a core upper mechanism 7.

Each core element 21 is vertically supported within the core barrel 3, and the entrance nozzle 2a at the lower end of each core is connected to a connecting pipe 1 provided in combination with the core support plate 4 and the support structure 5.
In such a reactor, the coolant introduced into the reactor vessel 1 through the inlet piping passes through the entrance nozzle 2a as shown by the arrow.
The heat generated in the reactor is transferred to a heat exchanger (not shown) through the outlet pipe 12 through the reactor vessel inner cylinder 6 and into a flow j11.

FIG. 2 shows an embodiment of the core component holding device of the present invention, in which a latch rod 22 is provided in the center of a fuel bottle 21 housed in the core component 2, passing through the axial direction. There is a latch plate 2 at the lower end of this latch rod.
3 is fixed. As shown in FIG. 3, this latch plate 23 is provided with a plurality of large-diameter coolant flow holes 24 of 7 m around the latch rod 22, and is spaced at 120 degree intervals on the periphery of the latch plate 23. 3 latch grooves 2
5 is stacked.

Near the upper fitting part of the entrance nozzle 2a, three missing pieces 2b are formed at 120 degree intervals at positions corresponding to the latch plays 1 and 23, and each of these notches has a latch made of spring material or the like. Part 26 is placed.

As shown in FIG. 4, these latch members 26 have outward protrusions 26a formed near the lower end of the plate-like body, and each protrusion passes through the notch 2b of the entrance nozzle 2a. , the latch groove 10 of the connecting pipe 10 provided on the outside thereof.
It is accepted within a.

Note that the upper and lower ends of the outer surface of the protruding portion 26a and the inner surface of the corresponding latch groove 10a are each formed into a tapered inclined surface. - Shows a bottle that locks onto the inside surface.

In the core component holding device of the present invention configured as described above, the latch plate 23 is
is shown in FIG. 3. J: The latch groove 25 is the latch member 2.
It is set in a position that does not match 6. In this case, the inner surface of the latch portion vJ26 is pressed by the outer surface of the latch plate 23, as shown in FIG.
It is housed in the wrap groove 10a of No. 0. - In this state, when the core component 2 receives a lifting force "1," the protrusion 26a of the latch member 26 receives a force F2 directed inward in the semi-longitudinal direction by the upper inclined surface of the connecting pipe 10. However, since the radial movement of the latch member 26 is suppressed, the core components 7 are prevented from floating even if a large floating force such as an earthquake load is applied.

On the other hand, when loading the core components and during the crossing 1@, the latch rod 22 is operated so that the latch delatching grooves 25 of the latch plates 1 to 23 come to the position of the latch member 26. At this time, when a pushing horn or a pulling force is applied to the core component 7, a radial force "2" acts on the latch member 26, and the latch groove of the latch plate 23
5, the latch member 26 and the connecting pipe 1
0 is disengaged, so the loading of core components,
Exchange becomes possible.

[Effect of the invention 1] As mentioned above, the reactor core of the present invention (I is an elemental holding device has difficulty in preventing floating with the conventional Hyde link hold-down system, and 1) It also prevents core components from floating up, improving reactor safety and reliability.

In addition, it is possible to adjust the flow rate by changing the opening area of the cold fJI material flow hole provided in the latch plate.
It is possible to shorten the length of the entrance nozzle, and to simplify the flow stop adjustment fitting, making it possible to make the reactor more compact.

[Brief explanation of the drawing]

FIG. 1 is a tSU sectional view showing an outline of a nuclear reactor to which the present invention is applied, FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention, and FIG.
The figure is a cross-sectional view taken along line 1 to 2 in FIG. 2, and FIG. 4 is a partially enlarged vertical sectional view showing the action of the latch member and its vicinity in the present invention. 1・・・・・・・・・Reactor vessel 2・・・・・・
......Core component 2a...Entrance nozzle 2b...Notch 3...Core barrel 4. ......Core support plate 5...
・・・・・・Support structure 6・・・・・・・・・Reactor vessel inner cylinder 7・・・・・・・・・Core upper mechanism 8・・・・・・...Rotating plug 9...
・・・・・・Fixed plug 10・・・・・・・・・・・・
Connecting pipe 10a... Latch groove 11... Inlet pipe 21...
・・・・・・Fuel bottle 22・・・・・・・・・・・・
Ut+7 hand rod 23... Latch plate 24... Coolant flow hole 2
5......Delatch groove 26...
...... Latch member 26 a...
・Protruding part 27 ・・・・Latching bottle agent Patent attorney Noriyoshi Chika 1j (and 1 other person) Figure 1 - Figure 2 Figure 3

Claims (1)

[Claims] (1) In a core component holding device that holds an entrance nozzle of a core component in a connecting pipe, a latch rod is rotatably disposed within the core component, and a latch rod disposed at the lower end of the latch rod is cooled. a latch plate provided with a material flow hole and delatching grooves at several places on the surface; a notch provided transparently in the surface of the entrance nozzle corresponding to the delatching groove; A latching member that is inserted and engaged with a latching groove formed in the connecting pipe.