JPS582782A - Reactor container - 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 nuclear reactor containment vessel.

Conventionally, the reactor containment vessel that houses the reactor pressure vessel has been used, for example, what is called the Oats 4-under type.
This thing has a flask shape as a whole, with a diaphragm inside.
- The reactor pressure vessel is divided into upper and lower parts by a double floor, with the upper part being a dry well and the lower part being a sag regi tank, and the reactor pressure vessel is housed in the upper Y dry well. A large number of vent pipes are installed that penetrate the diaphragm floor and are inserted into the sag chamber, and if steam leaks due to a rupture of the piping, the steam is channeled through the vent pipes into the sag chamber chamber. The structure was such that it was discharged into the nord water inside and condensed, thereby preventing an increase in internal pressure. However, this method had the disadvantage that the dry well, in which the reactor pressure vessel was housed, was formed on top of the sag regage dumper, resulting in an increase in overall height and size. A nuclear reactor containment vessel as shown in FIG. 1 has been developed to solve these problems. This thing forms the lower dry well 1 in the center of the lower part of the reactor containment vessel, and the area surrounding this lower dry well 1! A ledge chamber 2 is formed, and the upper part is separated from a subledge chamber/chamber 2 by a diaphragm floor 3 to form an upper dry well 4. The upper part is housed in the upper dry well 4. A large number of vent pipes 6... are provided passing through the diaphragm floor 3, and the lower ends of these vent pipes σ... - is immersed in water A. Further, a communication path 1 is provided which communicates the upper dry well 4 and the lower dry well 1.
The leaked steam flows through the communication path 1 to the upper dry well 4, and this upper dry well 4 Rikishima Lape/
It is configured to be sent into the sag regi- nchan/dou 1 via the pipe 6 . . . By the way, if a pipe breakage-4 occurs in such a system, the core cooling system Ide 8 should be used! - Le water is reactor pressure vessel 5
It is sprayed inside the reactor core to cool it, and is also used in the reactor containment cooling system I! 9, the Nord water A is sprayed into the upper dry well 4 to cool the inside of the reactor containment vessel.

However, in this case, the Nord water A sprayed in the upper dry well 4 accumulates on the diaphragm floor 3, and the communication path 1.
There was a problem that water flowed into the lower S dry well 1 through the water, and the lower dry well 1 was flooded with water. For this reason, $1 is stored in this lower dry well 1.
13 There was a problem in which important equipment such as the drive rod drive mechanism 10 was submerged in water, impairing its integrity.In addition, this lower drywell IK reservoir water no longer contributes to steam condensation. Therefore, it was necessary to store an extra amount of Nord water in the Sarutushi Enchan Δ2, which caused the problem that the subledge Enchan/fZ became larger.

The present invention has been made based on the above-mentioned circumstances, and its purpose is to obtain a reactor containment vessel in which the dispersed particles in the upper dry well do not flow into the lower P dry well. be.

Hereinafter, the first invention will be explained in accordance with the embodiments shown in FIGS. 2 to 6. 2g and 3 show the first embodiment, and 101 in the figures is the main body of the containment vessel. A cylindrical partition wall Jog is formed at the center of the lower part of the containment vessel main body 101, and the inside of this partition @101 is the lower dry well 10aKs. A gap is formed in the salssi seal/chan 4104.

Mata, this saderetsushiinchan/Kai xo4tD-'
That is, the upper end of the partition wall 102 and the inner circumferential surface of the containment vessel main body 101 are partitioned by a circular diaphragm floor 105, and the inner upper part of the containment vessel main body 101 is formed into an upper dry well 10g. A plurality of vent pipes 101 and 101 pass through this diaphragm floor 10g.
... are provided, and the lower ends of these vent pipes 31)F... are immersed in the water inside the ff ledge opening/4J 04 (Df-), and the upper ends of the diaphragm floor 1
014 and opens into the upper dry well 10ε. Further, a pedestal 1011 that also serves as a heat shield wall is protruded from the upper end of the partition wall 102, and a reactor pressure volume i1 J is placed on this pedestal A/J6a.
09 is installed.

The lower part of the reactor pressure vessel 10# is housed in the lower dry well Jai1, and the lower dry well 10B also houses the control rod drive mechanism 110 and the like. In the event that a pipe breaks, etc., use the above! Water is supplied into the reactor pressure vessel 109 by the 111 to cool the reactor core, and is sprayed into the upper dry well J06 by the 9 reactor containment vessel Sugerei system I 7'JJJK. It is configured to cool the inside of the reactor containment vessel. In addition, the partition wall 10
Communicating paths 113... are formed at the upper end of the jl, and these communicating paths 113...
and the lower dry well 103, and when steam leaks from the lower dry well 103, the steam passes through these communication paths JJJ... to the upper dry well 10.
6, upper dry well with 10g calavent tube 1
01 . These communication paths 11
3... is used as a passage for piping, cables, etc. The upper end portions of these communication passages 113 are open to the upper surface of the diaphragm floor 105, and an annular partition wall 114 is provided surrounding the openings of these communication passages 113. And this partition wall 11
4 is formed higher than the upper end of the vent pipe 101..., and the open end in the upper drywell JO+l of the communication path 113...
It is configured so that it is located at a higher position than the top of the .

The first embodiment of the first invention configured as described above is arranged around the lower dry well 103! Since the ledge attack chamber 104 is arranged, the height of the entire reactor containment vessel is reduced, and the entire reactor containment vessel is also made smaller. If steam leaks in the upper drywell 1.06, this steam will flow through the vent pipe 107... into the sag ledge 1 inch damper 104! - is released into the water and condenses;
This limits the pressure rise inside the reactor containment vessel. 9. If steam leaks from the lower dry well 103,
This steam is sent to the upper dry well set; Limit the rise. (9) In such a case, part of the boule water is sent into the reactor pressure vessel 1011 by the core cooling system bomb F111 to cool the reactor core, and the upper dry water is sent by the reactor containment vessel slui system pump 112. It is distributed within the well 1oti to cool the inside of the reactor containment vessel. And in this case, YC is sprayed in the upper part of the dry house. A partition wall 101 is provided around the openings of the communication passages 113..., and the upper end openings of these communication passages 113... are substantially perpendicular to each other. /G pipe 10'F・
...Since it is located higher than the upper end, the diaphragm floor xo6Vc is accumulated! - Le water is these vent pipes JoF
... was returned to the TF Ledge Sounchampa 104,
It does not flow into the lower dry well 10B. Therefore, important equipment such as the control rod drive mechanism 110 housed in the lower P-lye well 10S will not be submerged in water, and its integrity will be maintained.

Also, all of the sprayed boule water A is on the 7th floor.
Since it is returned to the Yanno mother 104 and contributes to steam condensation, this sag ledge 1 in the damper 104! -The amount of water required is less than before.

Note that the first invention is not limited to the first embodiment described above.

For example, FIGS. 4 and 5 show a second embodiment of the first invention. In this second embodiment, a nine-top partition wall 115 is provided horizontally above the partition wall 114, and The communication path 773...K is constructed so that the boule water A does not directly flow into the communication path 773...K. In this case, the piping 11σ...
etc. as shown in FIG.
These penetrating portions are provided with a ducking 112 and a liquid flow prevention mechanism 118 to prevent water from entering through these penetrating portions.

In addition, as in the third embodiment shown in FIG. 1, the upper partition wall 115'
The edges of the communication passages 11 may be bent downward to form a labyrinth-like upper end of the communication passages 11 to prevent water from entering.

Next, the present invention will be explained with reference to an embodiment shown in FIG. In this embodiment, a check valve mechanism 119 is provided at the upper end of the communication path 113 to allow flow only from the lower dry well 103 to the upper dry well 106. When steam leaks from the lower P-like 101, the pressure causes the check valve mechanism 119 to
The valve opens and steam flows into the upper dry well 106, and the steam is dispersed into the upper dry well 10-. - If water A tries to enter this communication passage 111, this check valve mechanism 11# closes and this! - This prevents water A from flowing into the lower dry fell 103. Note that this embodiment of the second invention has the same structure as the first embodiment of the first invention except for the point plate.

Furthermore, the first aspect of the present invention is not necessarily limited to the above-described embodiments, and for example, the structure of the upper end opening of the communication path is not necessarily limited to the above-mentioned structure, and the essence of the communication path is It is sufficient that the upper end opening is located above the upper end of the vent pipe.

Furthermore, the second invention is not necessarily limited to the one embodiment described above; for example, the structure of the check valve mechanism, its arrangement, etc. are not necessarily limited to the one embodiment described above. Not done.

As described above, the first aspect of the present invention includes an upper dry well formed surrounding the upper part of a reactor pressure vessel, a lower dry well formed surrounding the lower part of the reactor pressure vessel, and a lower dry well formed around the lower part of the reactor pressure vessel. A pent tube is inserted into the subledge injection chamber through the bottom diaphragm floor of the upper dry well and into the upper dry well, and the upper dry well and the lower dry well. The vent pipe is provided with a companion passage whose upper end is opened at a higher position than the upper end of the vent pipe. First, the second aspect of the present invention is an upper dry well formed surrounding the upper part of the reactor pressure vessel, a lower OP flyel formed surrounding the lower part of the reactor pressure vessel, and a JIS enclosure of the lower dry well. A vent pipe inserted into the bottom diaphragm floor of the bottom of the upper P dry well and a vent pipe inserted into the bottom diaphragm floor of the upper dry well communicates with the upper dry well and the lower dry well. The present invention is equipped with a communication passage that allows fluid to leak into the communication passage, and a check valve mechanism that allows fluid to flow only from the lower dry well to the upper dry well. Therefore, the upper dry well was sprayed! - There is no flow into the lower dry well through the Le Suisha conduit, and everything flows through the vent pipe! You will be returned to Ledge Nchampa.

Therefore, the equipment in this lower drywell may be submerged in water.
Instead, its health is maintained, and the capacity of the lessening chamber can be reduced, which has great effects.

[Brief explanation of drawings]

#I1 is a longitudinal sectional view of a conventional example. Figures 2 to 6
The drawings show the first embodiment of the present invention, the stripe 2 is a longitudinal sectional view of the first embodiment, FIG. 3 is a longitudinal sectional view of the upper part of the communication path of the first embodiment, and FIGS. FIG. 5 is a longitudinal cross-sectional view of the upper part of the communication passage of the second embodiment, and FIG. 6 is a longitudinal cross-section of the upper part of the communication passage of the third embodiment. FIG. 7 is a vertical cross-sectional view of the upper part of the communication passage in an embodiment of the second invention. 101... Containment vessel main body, 202... Partition wall, 103
・・・Lower dry well, 104 ・・・Salutsushikenchan Δ, J#J- ・Guiyafutum 24A, 101...
・Vent pipe, 109-... Reactor pressure vessel, 114...
- Partition wall, J 1 j a 11 j'... Upper partition wall, 119... Check valve mechanism. Applicant's representative Patent attorney Takehiko Kinko Figure 1 Figure 2 Figure 02 Figure 3 Figure 4 101 13 14C. 13 Figure 6 101 Figure 7 101 1. Indication of the case Patent application No. 10161/1982 2 Name of the invention Reactor containment vessel 3 Person making the amendment Relationship to the case Patent applicant: Tokyo Shibaura Electric Co., Ltd. 4. Agent 5. Voluntary amendment

Claims (2)

[Claims] (1) The upper part of the reactor pressure vessel is formed surrounding the upper part of the nuclear reactor pressure vessel. A lower dry well is formed surrounding the lower part of the dry well, and a 9 TF ledge is provided around the lower dry well, which is inserted into the sag ledge by penetrating through the diaphragm floor of the bottom of the upper dry well. Been
an atomic depletion containment vessel which is equipped with a 4-vent pipe, and a communication passage whose upper end opens at a higher position than the upper end of the vent pipe, and which passes through the upper P9 well and the lower dry well, and which contains 4I mold. . (2) The lower part of the reactor pressure vessel is formed surrounding the upper part of the reactor pressure vessel. I, the construction, and the nine tf ledge built around this lower drywell,
A vent pipe that penetrates the diamond 7 ram floor on the proximal surface of the upper dry well and is inserted into the sag regage chamber/4, and a communication path that communicates the upper dry well and the lower dry well, and a communication path provided in the communication path. A nuclear reactor containment vessel characterized by comprising: a check valve mechanism that allows fluid to flow only from the lower dry well to the upper dry well.