JPS5931487A - Reactor core spray device - 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 relates to a core streaking device, which is one of the 41 regular core cooling devices for nuclear reactors.

[Technical background of the invention] The water reactor is constructed as shown in Ki 1 She 1. That is, ) is a reactor pressure vessel, and a core shroud 2 is provided inside this pressure vessel 1,
A reactor core 3 is constructed by loading a large number of fuel assemblies inside the core shroud 2 and accommodating control rods therein.

Then, the coolant (soft water) in the pressure vessel 1 is sent to the lower part of the pressure vessel 1 by the circulation device 5 along with the coolant supplied from the water supply 2 and 4, and is directed upward inside the reactor core 3. To flow. In addition, the above cooling 4A is the core 3 residual flow 31F'I
It is heated during this process and sent to the shroud provided at the top of the core searoud 2, through the mud, to the steam/water separator 7, where it is separated into water and steam (1111). and separated steam 4
After moisture is removed by steam drying '58, the main steam nozzle 9
... is led out of the pressure vessel l, and is sent to a generator-driving turbine (not shown) via a main steam pipe (not shown) and -. In the figure, 1θ... indicates the control rod (not shown) in the reactor core! The control rod guide tube that guides the control rod inward from below, No. 1... is a control rod drive mechanism that moves the control rod up and down. An 11M water reactor like the one on Ushita is equipped with an emergency core cooling system that cools the core and restores the water level of the coolant in the event of a loss of cooling phase accident.

ζ A core spray 4+ fifi, which is one of the emergency core cooling systems, is installed above the core 1, and in the figure 121'L, 121' Yes, these Su-7-Noya 12g, 12b
are several ζ12 arc-shaped tubes j3m currently arranged along the inner circumferential surface of the shroud head 6 as shown in 21y and i,
13b, several spray nozzles such as spray nozzles 14, 15, etc. are arranged alternately in the circumferential direction toward the center of the core l. 14.15
Moso, +1. It's left-handed and left-handed. In the event of a loss of remediation material, the regeneration phase is supplied to both spargers 12a and 12b from a core spray line (not shown) through the core spray piping 16 (see Figure 1). It is injected from the spray nozzles 14..., 15... and scattered on the soil surface of the reactor core 1 to maintain the core 1 in a water-immersed state.

3rd [&I (A), (B) shows one of the spray nozzles 14, which is made by joining two 9 o 0 machine parts 17m and 17b at a predetermined angle, and inside the joint part ( It is made by lowering and enlarging the orifice 18 at the till, and the tip opening of one L N l 7 m becomes the injection port 19.The axial center line of the injection port I9 intersects the center line of the lead part of the reactor core l. At such an angle, the other L is 17 b i
E upper upper mesun jayu circular arc tube body 13m or lower su・
It is attached to the arc-shaped tube body 13b of the flat jar 12b by welding.

Figures 4 <A) and '(B) show the other glazed sedge glaze nozzle 15, which consists of two 9o0 elbows 20.
n, 20b'ff joint 17 at a predetermined angle, and orifice 21 is fitted inside the joint, and one L yl? 20*Vc has a cylindrical shape on the outer edge of the tip surface.
2, and a support rod 23 is attached therein so that the cylindrical shape is aligned with the center line of the id 22, and a small circular baffle plate 24 is attached to the tip of the support rod 23. 〃An annular injection port 25 is formed around the baffle plate 24 by attaching it to the center of the opening end of the id 22. It is configured so that the other L y+?2o b is the arcuate tube body 13a or 1
,? It is attached to b by welding.

Power, the above-mentioned Sedge Rei nozzle 15y or CM El7j
The reason why the circular angular f-id 22 was provided at the tip of the cylindrical guide 22 and the baffle plate 24 was placed at the center of the 0)10 end of the cylindrical guide 22 was as follows. In other words, the reactor core when the number of holes loses coolant! 171 plugs are used to continuously cool the reactor core.
It is desirable to spray on Koshin Jl#+4 at +ai1 of
r-(+2・Usage is? The material is only for songs with cylindrical guide 22 and evil 1ki 5 枦24!” is spread to 1:i payment through the form c99a25 and scattered over a wide area. It is also useful for the beach.

In this case, there is another i' in Enkyu 'y1' Buddha 11i1j.
Spray nozzle 14 of i# class... It is enough to cool it down (/1) so that it can be sprayed.

[Problems with back lot technology]

However, the core spray system constructed as above has the following problems.

That is, when a loss of coolant accident occurs, the inside of the reactor pressure vessel 1 becomes a steam atmosphere. The spray nozzle 14... is in such a steam atmosphere.

When the coolant is sprayed from 15..., heat exchange occurs between the coolant and the water vapor in the steam atmosphere, and the water vapor is condensed. Here, w > 4 Figure (A).

On the inside of the hollow conical cylindrical water stream sprayed from the spray nozzle 15 formed as shown in (B), there is less steam entering from the outside, so the depressurizing effect due to water vapor condensation is greater than on the outside, and the conical cylindrical shape The water flow becomes drawn inward due to the pressure difference between the inside and outside. As a result, the desired coolant diffusion effect could not be obtained, and there was a fear that cooling assistance for the core could not be enhanced.

[Purpose of the invention]

The present invention was made based on these circumstances, and
The purpose is to provide a core spray device that can enhance the diffusion effect of the cooling stroke and improve the cooling rate of the core.

[Summary of the invention]

The reactor core stripe installation of the first invention is arranged in an arc-shaped 77 body, and at least a part of the spray nozzles of the number of grains is connected to the injection port side L, 1-tip l1rjA1it11
A circle with a larger inner diameter than the inner diameter of the tip is attached to the inner diameter of the inner diameter of the inner diameter of the inner diameter of the inner diameter of the inner diameter of the inner diameter of the inner diameter of the inner diameter of the inner diameter of the inner diameter. It is something.

Second Invention iL++D A conical guide is attached to the end face of the L on the injection port side, and an internal linear fluid regulator is installed so as to be located on the axis of the cylindrical guide. The above Elpa? The flow regulator controls the injection direction of the coolant, so that the coolant is injected toward the vertical centerline of the core, and the coolant is spread over the entire upper surface of the core. It is something.

[Embodiments of the invention]

5 to 8 show an embodiment according to the first invention, in which the core spray device 10 includes the fifth to first and sixth M.
As shown in FIG.
It is composed of a gloss 104 and a lower surface 105.

A reactor core shroud is provided inside a reactor pressure vessel l06, and a large number of fuels 41, coalesces 107, and so on are loaded inside the core shroud to form a reactor core 107.

The Dobe Su-ya-Noya 104 has a semicircular arc-shaped tube body 108&, 108h along the inner peripheral surface of the Nyuloud head 103.
At the same time, several spray nozzles such as spray nozzles 109 and 110 of several seconds are attached alternately in the circumferential direction to the bottom d11 of each arc-shaped tube 108m and 108b. It is configured as follows. However, there are also spray nozzles 109 and 110 with opposite left and right hands. Each twisted arc-shaped tube body 108
a and 108b are connected to a common arc-shaped pipe 112 via vertical pipes 111g and 1llb, respectively, and this arc-shaped arrangement 11211-1 reactor pressure responder 1o6 (installed through r-W) 1 or core line Distribution T'? 77.9 to 10δ
F left 1+, there.

The lower part of the snow is glossy 1 osld, n-raudo\yl.

103 along the inner circumferential surface of each arcuate tube body 174m, 114b.
10 and several paddy grains are arranged alternately in the circumferential direction. Each circular arc 'f+'+ (□k I
14 a.

J74b tdjltle mrft distribution v7751,
It is connected to a common arc-shaped pipe 116 via tlsb, and this arc-shaped pipe 116trJ: Reactor pressure volume M>'=
Core line pipe 1 installed through 7 o 6
13.

One type of spray nozzle l 09 f'j'z
@7 Figure (A), (11)
, 2 pieces) 9 Q0 El yjt" 117tr, 117b are joined at a predetermined angle, and an orifice z is placed inside the joint.
It is formed by enlarging the LSF, and one side of L N is 117 m.
The tip opening of the injection port 120 is a square leaf such that the axial line of the injection port 120 intersects the vertical center line of the reactor core 107, and the other L s; body 108g, 108b, 114th section or 174b)'1
I'm being treated.

- Yet another type of spray nozzle 110 is shown in FIG.
A), as shown in ([3), two 90° machining angles 12
1m, 121b are joined at the desired angle, and the orifice 122 is inserted into the inner part of the joint, and one L, Y Z 21a K, is attached to the outer edge of the tip surface with the inner diameter of the tip of this L, Y Z 21a K. A cylindrical guide 123 having a larger inner diameter is welded so that the opening at the tip of the id 123 is 1'f, and the i injection port 126 is formed. Spread it...
It is configured to be sprayed. And the injection port 1
At an angle such that 26's support intersects with the lead center section of reactor core 107, is the other BUJ's El yj? 12 lb is surrounded by the arcuate tube body 108a, 108b, 114h or 114h.

The core spray device 101 configured as described above operates as follows. (In other words, in the event of a loss of coolant accident, the reactor core spray line 11
．． 7 through 1. #i! Coolant is supplied to the arc-shaped pipes 112 and 116 inside the f-furnace pressure vessel 106, right? The 9th phase is connected to the inboard piping 111 via +111b, 115a, and 115b to the arc-shaped pipe body 108a of the earthworks 1i1i and 104.1θ5.

Flow into J 08b, 114h, 114b. and 111 spray nozzles 109..., 110
. . . One piece of cloth is to be placed on the top surface of the core 107 through all four.

And the reactor core rail l on t;U <configuration>1.

1 & 101, the conventional spray nozzles shown in FIGS. Since the nozzles 10... shown in Bl are used, each nozzle 109...

770... The phase that can be completely sprayed will not be the same as the hollow circle t14 cylinder. In particular, Figure 8 (A),
The spray nozzle 110 shown in (B) has 11 convex bodies 4 (1
A cylindrical guide with a large inner diameter at the tip of Kawa Iru + R121m/
23 ff is taken, so the cold ejected from this nozzle 11θ): (I is scattered in a solid 1'-11;!r shape.Then, it mixes with the water bubbles in the steam atmosphere and Heat exchange takes place, and even if the water vapor is completely condensed, the diffusion angle of the solid cone will not narrow.Therefore, in the event of a loss of coolant accident, all nozzles 109..., 110... Cooling ears are distributed over a wide area on the first surface 11, the pressure inside the pressure vessel decreases rapidly, and the core Iθ7 is rapidly cooled down.

In addition, in the above embodiment, the coolant was placed in a circle (1F shape).
Expanded spray nozzle 110 that makes T eyes 11
The I/CL was arranged so that the Suffu-0 Ray nozzles 109... of the Immortal Gods were arranged alternately, but all the Sufu-0 Ray nozzles were spread as shown in Figure 8 (A) and (+3). It may also be an injection type spray nozzle.

Next, Example 4 related to the second 21i-' moth, Fig. 9 (4)
This will be explained with reference to , addition.

In this embodiment, the spray nozzle 110 of the embodiment according to the first invention shown in FIGS.
) and (B), and the other configurations are the same as the real noise q example according to the first invention VC.

Therefore, the spray nozzles 77 o'it shown in 1(A) and (B), and the two 90° wells 21'n
, 12 no'b - Join at a specified angle, and hammer together 8
Insert the orifice 122' into one of the elbows I2I'm, and attach the inner diameter of the tip 1/!A1 to the outer edge of the end surface. The circle t) shape with a larger inner diameter is id 123”fr #N,
Example of internal νC of Katsuko
Wr-J' kc *; Sud
The open end 1] of the cylindrical guide 123' is connected to the injection port 12.
6', and the injection port 126 is structured so that the imitation coolant is diffused into a solid conical shape and can be injected at the point where the injection is completed. 1 is the lead center line of the core 107 and 5
(The elbow 121'b, which is angular and has an external force, is inserted into the arc-shaped tube (4:1osa, 1θ8b).

The ears are sharp at 114a or 114b.

When using the spray nozzle 110' as described above, the coolant comes into contact with the regulating fluid 124 inside the cylindrical id 123' from the 5pzzca, and is injected from the injection port 126' along the regulating fluid 124. The injection direction of the coolant is regulated by the regulating fluid 124, so that it does not deviate significantly from the axis of the injection port 126'. Therefore, the coolant can be distributed almost evenly over the entire upper surface of the core 1θ7, and the cooling effect of the core can be enhanced. Similar to the embodiments shown in FIGS. 5 to 8, the coolant injected from the spray nozzle 110' is dispersed in a solid cone shape, so that it mixes with water vapor in the steam atmosphere and condenses. The solid conical diffusion angle does not narrow even when the solid cone is spread, and the solid cone is spread over a wide area on the upper surface of the reactor core 107, rapidly reducing the pressure in the pressure chamber, and causing the core 107 to
7 can be rapidly cooled.

Furthermore, even in the embodiment according to the second invention, it is possible to use all the spray nozzles as diffusion injection type spray nozzles as shown in FIG.

〔Effect of the invention〕

As mentioned above, the core surray device of the invention of -1,1 is as follows:
Is it connected to the core line piping and placed along fi'd 17ii inside the shroud head on one side of the core? '1'
Sa Jl da circular arc 1'? body, and attach this arc-shaped 9゛ to the body 7
1"111 with multiple spray nozzles and a shell 1+iit
l/s At least some of the spray nozzles are made by joining two L+1- and placing an orifice inside the joint F.
The human Elle? The elbow 04'l' on the tip surface of;
A cylindrical guide with a larger inner diameter than the inner diameter of the end part is taken 7rj, and the other elbow is attached to the arc-shaped tube body 17 to form a ladle for spouting the liquid phase in the shape of a medium-heat cone. This enhances the diffusion effect of the cooling phase and allows the core to increase its cooling rate.

Also, what about the core glaze loading and unloading of the second invention, and one L of the spray nozzle with the cylindrical guide removed in the first invention? Then, the straight female fluid is connected to the above-mentioned circle 1.
Since the guide is attached so as to be on the axis of the shaped guide, the presence of the flow regulator has the effect of regulating the direction of coolant injection, allowing for even more rapid cooling of the core. can.

[Brief explanation of the drawing]

＠Figures 1 to 4 show the background technology. Figure 1 is a vertical cross-section of a boiling water reactor, Figure 2 is a vertical cross-section of the shroud, and Figure 3 (A). (fl is a partially cutaway plan view and front view of the spray nozzle, Fig. 4 (A)
, ([3] is a partially cutaway plan view and front view of another type of spray nozzle, and FIGS. 5 to 8 show embodiments of the first invention, and FIG. 6 is a perspective view and a vertical sectional view of the core spray device, and FIG. 7 (A
), ω) is a partially cutaway plan view and front view of a spray nozzle, 8P; s figure (A), ω) is a partially cutaway plan view and front view of another type of spray nozzle, FIGS. 9A and 9B are a plan view and a front view, partially cut away, showing a spray nozzle in an embodiment of the invention of iA2. 10...core spray equipment ^:, 1O3...ノ,
Loudhead, I 07-...Furnace 11') s 1
08 a, 108br114 a, 114
b - arc 41゛tube, IO2゜710, 710'・
...Spray nozzle, 11:l...Core streak line piping, 121 n, 12 l b, I 21'hJ
21'b...90° Ernj? ,122,1:! 2
'----A Reifis, 723112.9'...Yen?
+5-shaped guide, 124... rectifier, 126, 126'
...411I ejection port. Benji 11 Suzue Takeuchi Figure 3 (A) 9 (B) No. 5 (A) (B) Figure 5 Figure 611 Figure 7 (A) (B) Figure 8 (A) )

Claims (1)

[Claims] (]) An arcuate tube connected to the reactor core line tube and arranged along the inner peripheral surface of the shroud head above the core, and a number of nuclei attached to the arcuate tube. a spray nozzle, at least some of the spray nozzles having two elbows connected to each other. And these two L? An orifice fitted inside the joint of the elbow and an orifice fitted on the inside of the joint of the A cylindrical guide with an inner diameter larger than the inner diameter of the tip of the cylindrical guide, and an open end m of the cylindrical guide.
A reactor core spray device characterized in that ++ is an injection port, the axis of the injection port intersects with the vertical line of the reactor core, and the other elbow is attached to the arc-shaped tube body. (2) Includes an arcuate tube connected to the reactor core gas pipe and arranged along the inner circumferential surface of the sealoud 9 head above the core, and a plurality of spray nozzles attached to this arcuate tube. Unfortunately, some spray nozzles are actually two L-Hs connected to alternate layers. And, the orifice fitted inside the joint of both elbows R and the tip of one elbow are attached to the tip of that elbow. A cylindrical guide having an inner diameter larger than the inner diameter of the optical part of the cylindrical guide, and a cylindrical guide located on the axis of this cylindrical slide. The opening end of the cylindrical guide is attached to the injection port 1, and the axis of the injection port is intersected with the vertical center side 1 of the reactor core. L? is attached to the arc-shaped tube body.