JPS62228977A - Nuclear reactor in-core structure - 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] [Purpose of the invention] (Industrial application field) The present invention relates to reactor internals for boiling water nuclear reactors.

(Prior art) Generally, a boiling water reactor is configured as shown in FIG. 7, and a shroud 2 is accommodated in a reactor pressure vessel 1. A core support plate 4 is installed at the bottom of the plate 3.
A large number of fuel assemblies 5 supported above are held by the upper grid plate 3 to form a reactor core.

On the other hand, at the upper end of the shroud 2, a shroud head 6 is fastened to a large number of shrouds by Rad bolts. A large number of stand vibes 7 are installed in the shroud head 6, and reinforcing plates 8 are provided between the stand vibes 7. A steam separator 9 is disposed at the upper end of the stand vibe 7, and a steam dryer 10 is disposed above the steam separator 9.

Thus, the coolant in the reactor pressure vessel 1 of the boiling water reactor is guided from the lower part of the reactor vessel to the reactor core, boils in the fuel assembly 5 that constitutes the reactor core, and becomes a gas liquid of water and steam. The flow becomes a two-phase flow and flows to the shroud head 6. The water and steam in the shroud head 6 further pass through the stand vibe 7 and are separated into water and steam by the steam [59]. The separated steam is dried in a steam dryer Z10 and then transferred to the main steam nozzle 1.
1 and is sent to a steam turbine via a main steam pipe (not shown).

Further, the reactor pressure vessel 1 is formed with a water supply inlet nozzle 14 that guides cold W water from outside the reactor pressure vessel 1 to a water supply sparger 13 provided on the inner wall of the reactor pressure vessel 1 .

In addition, a core spray nozzle 15 is formed in the reactor pressure vessel 1 as a nozzle for guiding cold W water into the reactor pressure vessel 1.

(Problems to be Solved by the Invention) In the conventional nuclear reactor configuration, the number of stand vibes 7 installed in the shroud head 6 is limited to only one installed in the center of the shroud head 6. is connected to the reinforcing plate 8, whereas the stand vibe 7 located on the outer periphery of the shroud head 6 has a structure in which it is supported only by the part where it is attached to the shroud head 6.

Therefore, the rigidity of the stand vibe 7 located on the outer periphery of the shroud head 6 is very small compared to that of the stand vibe 7 located elsewhere. Therefore, there was a risk that the stand vibe 7 on the outer periphery of the shroud head 6 would be deformed due to the combination of the shroud head 6 and the stand vibe 7.

Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and provides a nuclear reactor internal structure in which the rigidity of the stand vibe is improved and the stand vibe is not deformed due to co-construction of the shroud head and the stand vibe. The purpose is to

[Structure of the invention]

(Means for Solving the Problems) A nuclear reactor internal structure according to the present invention includes a stand vibrator installed in a shroud head in a reactor pressure vessel, and an air/water vapor disposed above the stand vibrator. It has a separator, a lower reinforcing plate that radially connects the stand vibe, and an upper reinforcing plate that radially connects the steam separator.

(Function) In the nuclear reactor internal structure of the present invention, the shroud vibrators are integrated by the lower reinforcing plate that connects them radially, and the steam separators are connected radially. It is integrated by the upper reinforcing plate. Therefore, even if vibrations occur due to an earthquake, for example, both the center and outer peripheral parts of the stand vibrator are directly reinforced as an integral part, and the stand vibrator exhibits its rigidity.

Moreover, both the center and outer peripheral parts of the steam and water separators disposed in each of the stand vibes are integrated, and the stand vibe is indirectly reinforced through the steam and water separators.

(Example) The present invention will be described in detail below with reference to FIGS. 1 to 6. In describing one embodiment of the present invention, the same members as those shown in FIG. 7 are designated by the same reference numerals, and their explanation will be omitted.

Reference numeral 21 shown in the figure is a shroud head fastened to the upper end of a shroud 23 housed within the reactor pressure vessel 1. A large number of stand vibes 24 are installed in the shroud head 21, and a steam separator 25 is provided at the upper end of each stand vibe 24. The stand vibes 24 are connected in the middle by lower reinforcing plates 4fi26 arranged radially, and the lower reinforcing plates 26 are fastened to the stand vibes 24 arranged radially.

On the other hand, the steam/water separators 25 are connected at their upper portions by upper reinforcing plates 27 arranged radially, and the upper reinforcing plates 27 connect the radially arranged steam/water+m devices 25.
interconnected.

Further, a lower reinforcing member 28 disposed along an extension of the lower reinforcing plate 26 is connected to the outer periphery of the stand vibe 24 located at the outermost periphery. Similarly, an upper reinforcing member 29 disposed along the extension of the upper reinforcing plate 27 is connected to the outer periphery of the steam/water separator 25 located on the outer periphery.

These lower reinforcing members 2 and the upper reinforcing members 29 are connected to reinforcing vertical members 30 erected on the shroud head 21 at the outer periphery of the stand vibe 24 and the steam separator 25 located at the outermost periphery. (See Figures 1 and 6).

That is, the lower reinforcing plate 26 is attached to the outermost stand vibe 2.
4. Through the lower reinforcing member 28, also the upper reinforcing plate 27
are the reinforcing vertical members 3 through the outermost steam separator 25.
Concatenated to 0.

Note that when connecting the lower reinforcing member 28 and the upper reinforcing member 29 to the stand vibe 24 and the steam/water separator 25, the stand vibe 24 and the steam/water separator! You can also make the fi25 meat 1 so thicker. By doing so, the rigidity can be further improved.

Furthermore, as shown in FIGS. 1 to 5, the reinforcing wire 30
Ha, stand vibe 24, air and moisture! It is connected to an annular tightening ring 31 disposed so as to surround the outer periphery of the container 25.

This tightening ring 31 may be one piece at an appropriate position in the vertical direction of the reinforcing vertical member 30, or a plurality of tightening rings 31 at appropriate intervals in the vertical direction.
For example, they are arranged in three pieces as shown in the figure.

In this way, by connecting the reinforcing vertical members 30 in an annular manner with the tightening ring 31, the reinforcing property is improved by -r, and the rigidity of the stand vibe 24 is significantly improved. That is, the stand vibe 24 is directly reinforced by the lower reinforcing member 28 and the lower reinforcing plate 26 via the reinforcing vertical member 30 reinforced by the tightening ring 31. Also, the tightening ring 3
The upper reinforcing member 29 is supported and reinforced by the upper reinforcing plate 27 via the reinforcing vertical member 30 reinforced by the upper reinforcing plate 27. Therefore, the stand vibe 24 has significantly improved rigidity, earthquake resistance,
Reliability can be further improved.

The present invention is not limited to the embodiments described above, and the installation positions and numbers of the lower reinforcing plate 26, the upper reinforcing plate 27, the lower reinforcing member 28, the upper reinforcing member 29, the reinforcing vertical members 30, and the tightening rings 31 , combinations, etc. can be changed arbitrarily within the range that can achieve the purpose of the present invention.

〔Effect of the invention〕

As described above, the nuclear reactor internal structure according to the present invention is
The stand vibes implanted in the shroud head are connected by the reinforcing plates arranged radially, and the stand vibes at the outer periphery are also reinforced and supported, so the rigidity of the stand vibes can be improved. Therefore, deformation of the stand vibrator due to resonance of the shroud head and stand vibrator that occurs during an earthquake can be prevented, and kJ
This has the effect of improving B properties and reliability.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of essential parts showing one embodiment of a nuclear reactor internal structure according to the present invention, FIG. 2 is a cross-sectional view taken along the line B-B in FIG. 1, and FIG. A sectional view taken along the line C-C in
FIG. 4 is a longitudinal sectional view of section A in FIG. 1, and FIG. 5 is a schematic perspective view with some parts omitted of the reactor internal structure according to the present invention.
FIG. 6 is a vertical sectional view of a main part in another embodiment of the present invention, and FIG. 7 is a vertical sectional view of a nuclear reactor pressure vessel. 1...Reactor pressure vessel, 2...Shroud, 3...
・Upper grid plate, 4... Core support plate, 5... Fuel assembly, 6... Shroud head, 7... Stand vibe, 8... Reinforcement plate, 9... Steam and moisture! ! ! Vessel, 10・
...Steam dryer, 11...Main steam nozzle, 12...
Main steam pipe, 13... Water supply sparger, 14... Water supply inlet nozzle, 15... Core spray nozzle, 21...
・Shroud head, 23...Shroud, 24...
・Stand pipe, 25...Steam water separator, 26...
Lower reinforcing plate, 27... Upper reinforcing plate, 28... Lower reinforcing member, 29... Upper reinforcing member, 30... Reinforcing vertical member, 31... Clamping ring. Representative Patent Attorneys Nori Chika Ken Yudo Mitsumata Hiroshi Fumitsuru l Koocha 2 Zucha 3-Kaisha 4 Figure 5 Inyou 6 Figure

Claims (1)

[Claims] 1. A standpipe installed in the shroud head in the reactor pressure vessel, a steam separator installed at the top of the standpipe, and a lower reinforcing plate that radially connects the standpipe. and an upper reinforcing plate that radially connects a steam separator. 2. The lower reinforcing plate is connected to a lower reinforcing member disposed along an extension of the lower reinforcing plate on the outer periphery of the outermost standpipe. Structure. 3. The nuclear reactor according to claim 1, wherein the upper reinforcing plate is connected to an upper reinforcing member disposed along an extension of the upper reinforcing plate on the outer periphery of the steam/water separator located at the outermost periphery. Furnace internal structure. 4. The nuclear reactor internal structure according to claim 2 or 3, wherein the lower reinforcing member is connected to a reinforcing vertical member erected on the outer periphery of the outermost stand pipe. 5. The reactor internal structure according to claim 3 or 4, wherein the upper reinforcing member is connected to a reinforcing vertical member erected on the outer periphery of the outermost steam separator. thing. 6. The reactor internal structure according to claim 4 or 5, wherein the reinforcing vertical members are connected to each other by an annular tightening ring.