JP3340871B2 - Reactor containment vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a containment vessel for a boiling water reactor, which reduces the amount of work required when constructing a diamond from floor.

[0002]

2. Description of the Related Art In the event of an accidental damage to the primary reactor system,
The reactor containment vessel is provided so that radioactive materials leaked from the reactor core are contained in the system and radioactivity is not released outside. The reactor containment vessel of the boiling water reactor is all pressure suppression type, and consists of a drywell and a pressure suppression chamber.

[0003] In the drywell, in addition to equipment belonging to the reactor pressure boundary such as a reactor pressure vessel, recirculation system piping, steam piping, and valves, a reactor pressure vessel base (pedestal), and a containment vessel such as a heat shield. The internal structure and the air-conditioning equipment are housed, and the size is determined so as to secure the space required for piping, installation, maintenance, and the like, in addition to the requirements related to safety.

As shown in FIG. 4, a reinforced concrete reactor containment vessel 1 in a boiling water reactor has a reactor pressure vessel 3 installed above a steel reactor pressure vessel base 2 in the center of the inside. A diamond floor 6 made of a reinforced concrete slab which partitions the space between the steel reactor pressure vessel base 2 and the reactor pressure vessel 3 into a dry well 4 and a suppression pool 5 vertically.

In constructing the diagram floor 6, as shown in an enlarged view of a main part in FIG. 5, first, when the reactor containment vessel 1 is constructed, the outer periphery of the upper end of the steel reactor pressure vessel base 2 and the reactor A cantilever-type temporary supporting steel frame 7 from the steel reactor pressure vessel base 2 is provided between the inner circumferences of the containment vessel 1, and is supported by a column 8.

Next, a seal plate 9 in which cut tee steel is previously disposed is installed on the upper surface of the temporary supporting steel beam 7, and a stud bolt 10 and a reinforcing bar 11 are disposed on the upper surface, and then concrete 12 is poured. To construct a diamond-from-floor 6 using reinforced concrete slabs. The diamond floor 6 is independently supported by the containment vessel 1 and the steel reactor pressure vessel base 2.

[0007] A liner plate 13 is stretched inside the containment vessel 1, and a liner inner shear plate 14 and a liner outer shear plate 15 are installed inside and outside the liner plate 13. In addition, concrete 12
When the curing period is completed, the temporary supporting steel beam 7 and the support 8 are removed, and the construction work is completed.

[0008]

SUMMARY OF THE INVENTION Diamond From Floor 6
In the construction process of (1), the temporary supporting steel beams 7 and the supporting columns 8 are arranged before the construction of the diamond-from-floor 6, thereby supporting the construction of the diamond-from-floor 6 such as casting of concrete 12. At the end of the curing period, temporary supporting steel beams 7 were removed.

However, in the piping and other facilities in the suppression pool 5 located below the diamond floor 6, the provision of the temporary support steel beams 7 and the like on the diamond floor 6 is an obstacle to the work.
There is a problem that work cannot be started until these are removed.

The temporary supporting steel beam 7 has a large steel frame size because of the cantilever structure from the reactor pressure vessel base 2, and has a relief safety valve exhaust pipe which is installed and penetrated through the diamond floor 6. There is a problem that work such as notching of the temporary support steel beam 7 occurs due to interference with the manhole.

Further, when removing the temporary supporting steel beam 7 or the like, it is necessary to divide the member into a size capable of being carried out.
There is a problem that not only requires a large amount of work and time, but also requires a large amount of temporary materials.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a steel beam is supported on both ends of a reactor pressure vessel base and a reactor containment vessel to reduce the size of a steel frame. The relief safety valve exhaust pipe through hole and manhole installed on the from floor are arranged so as to avoid interference with the steel beam, and are also used as a support in the platform in the suppression chamber and the relief safety valve exhaust pipe support. It is an object of the present invention to provide a reactor containment vessel that does not require removal work and that can be operated in parallel in other areas within the wet well.

[0013]

According to the present invention, there is provided a reactor pressure vessel and a reactor pressure vessel base for supporting the reactor pressure vessel. in the containment vessel equipped with a diamond From floor to form a pool, the atomic
Installed on a liner plate stretched on the inner wall of the containment vessel
A first steel beam support member,
A second steel beam support member provided on a foundation,
Between the second steel beam support member and the second steel beam support member
Steel beams with slits formed in the vertical direction
Seal plate laid on the trabecular bone and this seal plate
Reinforcing bar placed on the plate and striking on the seal plate
And concrete provided .

[0014]

[0015] Further, the relief safety valve exhaust pipe through hole and manhole which are installed and penetrated on the diamond from floor,
The layout will avoid interference with steel beams. In addition, a stud bolt is implanted on the steel frame, which serves as a support for the platform in the suppression chamber and the relief safety valve exhaust pipe support, thereby eliminating the cut tee steel on the diamond fromm floor seal plate. This eliminates the need for removing the temporary supporting steel beam as in the conventional example, enables parallel work in other areas, and can reduce the amount of work and the construction period.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a containment vessel according to the present invention will be described with reference to FIGS. FIG.
FIG. 2 is an enlarged longitudinal sectional view of a main part of the containment vessel according to the first embodiment, and FIG. 2 is an enlarged plan view of the main part of FIG.

That is, in FIG. 1 and FIG.
Diaphragm floor that divides the interior of the reactor containment vessel shown in 1 into a dry well 102 and a suppression pool 103
105 is a liner plate 104 inside the reactor containment vessel 101.
A steel beam 107 extending between both ends of a steel beam support member 108 inside the liner and a steel beam support member 109 inside the reactor pressure vessel base 106,
7 is made of a reinforced concrete slab in which concrete 115 is cast on a seal plate 110 laid on the upper surface. Reference numeral 117 is a vertical rib of the base .

The construction of the diamond floor 105 in the containment vessel 101 is performed by firstly forming a liner plate 104 on which stud bolts 112 are implanted and a reactor pressure vessel base 106.
The steel frame support member 108 is welded to the liner plate 104, and the steel frame support member 109 is also welded to the reactor pressure vessel base 106 side.

Next, a plurality of steel beams 107 are installed between the steel support members 108,109. This steel beam 107
, A suppression pool platform 113 and a relief safety valve exhaust pipe support 114 are integrated.

Thereafter, the stud bolt 11 is placed on the steel beam 107.
1 and plant a seal plate 110 on the upper surface between the steel beams 107.
Laying. Reinforcing bars 116 are arranged on the seal plate 110, concrete 115 is poured, and after the curing period, the diamond fromm floor 105 is completed.

The steel beam 107 is a diamond-from-floor.
105 The structure is designed to bear the concrete placing load and seal plate weight at the time of construction. In addition, the suppression platform 113, relief safety valve exhaust pipe support
It is designed to handle 114 loads.

According to this embodiment, the diamond-from floor
When the reactor containment vessel 101 was completed to the level of the diamond fromm floor 105 at the time of the construction of the 105, the supporting members such as the concrete 115 casting load at the time of the construction of the diamond fromm floor 105 could be used as the base of the reactor pressure vessel. It can be supported at both ends of the table 106 and the containment vessel 101. Therefore, there is an effect that the size of the steel frame can be reduced and the columns can be deleted as compared with the conventional cantilever type.

In the conventional example, the supporting steel beams and the columns are removed after the construction of the diagram floor, but according to this embodiment, even after the construction of the diagram from floor, the suppression pool platform 113 and the relief safety valve exhaust pipe support are removed.
As 114 support of, by utilizing a steel beam 107, the temporary setting support beams dismantling is not required, the materials and working steps is reduced, without giving any trouble to operations in other parts of the suppression pool 103 In addition, there is an effect that the processes can be shortened by performing parallel operations.

Further, in the conventional example, cut-tee steel is provided on the seal plate, and the pull-out load and the like of the stud bolt on the cut-tee steel are made equal to the linear load. By providing the Sudd bolt, there is an effect that the cut tee steel can be deleted.

Next, a second embodiment of the containment vessel according to the present invention will be described with reference to FIG. In FIG. 3, the same portions as those in FIG. 1 are denoted by the same reference numerals, and the description of the overlapping portions will be omitted.

The second embodiment differs from the first embodiment in that one or more slits 121 are provided in the steel beam 107, and the other parts are the same as in the first embodiment. . According to the second embodiment, the thermal expansion of the steel beam 107 can be prevented. The other parts have the same functions and effects as those of the first embodiment.

Further, instead of the slit 121 shown in FIG. 3, a steel beam partially connected by bolts can be used. In this case, the slit 121 can be removed, and further, a stud is provided on the steel beam. It is also possible to use a supporting steel frame without installing.

In each of the above-described embodiments, the strength of the steel base 107 can be ensured by aligning the position of the vertical ribs of the reactor pressure vessel base 106 with the position of the steel base 107 for the arrangement of the steel base 107. In addition, the relief safety valve exhaust pipe through hole and manhole that are installed and penetrated on the diamond from floor,
The layout will avoid interference with steel beams.

Further, the steel beam 107 is also used as a platform in the wet well for accommodating the pool water and as a support for the relief pipe of the relief safety valve, so that the conventional temporary steel beam need not be removed.

[0030]

According to the present invention, it is possible to reduce the size of the steel frame and to remove the columns in the construction process of the diamond-from-floor, and to eliminate the work of removing the temporary steel beam, thereby reducing the construction process and materials. There is an effect that can be done.

[Brief description of the drawings]

FIG. 1 is an enlarged longitudinal sectional view showing a main part of a diagram from floor of a first embodiment of a reactor containment vessel according to the present invention.

FIG. 2 is an enlarged plan view showing a main part in FIG. 1;

FIG. 3 is an enlarged longitudinal sectional view of a main part of a second embodiment of the containment vessel according to the present invention.

FIG. 4 is a longitudinal sectional view showing a conventional reactor containment vessel with a partial side view.

FIG. 5 is an enlarged longitudinal sectional view showing a main part of a diagram floor in the containment vessel shown in FIG. 4;

[Explanation of symbols]

1,101 ... containment containment vessel, 4,102 ... dry well,
5,103 ... suppression pool, 13,104 ... liner plate, 6,105 ... diaphragm floor, 2,106 ... reactor pressure vessel base, 7,107 ... steel beam, 108 ... steel beam support member (liner), 109… Steel beam support member (foundation)
9,110 ... seal plate, 10, 111 ... stud bolt (seal plate), 112 ... stud bolt (liner), 113 ... suppression platform, 114 ... relief safety valve exhaust pipe support, 12, 115 ... concrete, 1
1,116… Reinforcing bar, 117… Vertical rib of base, 118… Steel beam, 119… Thru-hole of relief valve exhaust pipe, 120… Manhole, 3… Reactor pressure vessel, 8… Strut, 14… Shear plate inside liner, 15 ... Liner outer shear plate, 121 ... Slit.

Continuation of the front page (56) References JP-A-7-234296 (JP, A) JP-A-6-64195 (JP, U) JP-A-6-4696 (JP, U) JP-A-6-72095 (JP, U) , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G21C 13/02 G21C 13/00

Claims (1)

(57) [Claims] 1. A reactor pressure vessel, comprising: a reactor pressure vessel base for supporting the reactor pressure vessel; and a diagram from which the inside is vertically separated to form a drywell and a suppression pool. In the containment vessel, a first steel beam support member provided on a liner plate stretched on an inner wall surface of the containment vessel, and a second steel beam provided on the reactor pressure vessel base A support member, a steel beam erected between the first steel beam support member and the second steel beam support member and having a slit formed in a vertical direction, a seal plate laid on the steel beam, A containment vessel comprising: a reinforcing bar arranged on a seal plate; and concrete cast on the seal plate.