JP3601046B2 - Water shielded reactor containment vessel - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a containment vessel for storing a reactor pressure vessel.
[0002]
[Prior art]
In order to improve the performance of a conventional boiling water reactor (BWR), the development of an improved BWR (ABWR) is underway. The design of the ABWR follows the pressure suppression method used in the conventional BWR, but the cylindrical shape has been simplified and the structure has been made reinforced concrete to function as the main structural element of the reactor building. This is a different feature from the past.
[0003]
FIG. 4 is a configuration diagram of the reactor containment vessel and the reactor building of the ABWR. The cylindrical containment vessel is made of reinforced concrete (about 2 m thick) that acts as a pressure barrier against an increase in internal pressure and a lined steel sheet that maintains airtightness. The entire reactor containment vessel is composed of three regions: an upper drywell, a lower drywell, and a suppression chamber.
The upper drywell houses an upper half of a reactor pressure vessel (RPV), main piping such as a main steam pipe and a water supply pipe, and an air conditioner for adjusting an ambient temperature. The lower drywell houses the lower part of the reactor, the motor part and the control drive unit of the internal pump directly attached to the lower part, and the service platform for maintenance and inspection thereof. The pressure suppression chamber includes a suppression pool that stores a large amount of water serving as a heat sink and a space above the suppression pool.
[0004]
The upper and lower drywells are spaces that communicate with each other and initially receive the energy released from the pressure vessel. This energy is released and absorbed into the suppression pool through a plurality of vent pipes.
[0005]
[Problems to be solved by the invention]
Since the above-mentioned conventional containment vessel is made of reinforced concrete, it is necessary to secure time for the concrete to solidify, and there has been a problem that the construction period is long. In addition, there is a problem that construction costs increase because a large amount of concrete is used. Furthermore, since there is no cooling means when the containment vessel is affected by excessive heat, the containment vessel must be constructed robustly, and the construction period becomes redundant and construction costs increase. there were.
[0006]
The present invention has been made to solve such a problem. That is, an object of the present invention is to provide a nuclear reactor containment vessel having a radiation shielding effect equivalent to that of a conventional reactor vessel made of reinforced concrete, shortening the construction period, and reducing construction costs.
[0007]
[Means for Solving the Problems]
According to the present invention, the reactor pressure vessel is housed therein, withstands the internal pressure when the internal pressure rises, and has a double steel plate wall that maintains airtightness, from a water inlet provided on the double steel plate wall. A siphon is continuously connected to the water inlet, which is filled with shielding water , and the tip of the siphon is immersed in a temporary storage pool provided at the upper part of the reactor containment vessel. A water shielding reactor containment vessel is provided, wherein a pipe for supplying water for shielding is connected to the heavy steel plate wall or the siphon .
[0008]
According to the configuration of the present invention described above, since the containment vessel is constituted by the double steel plate walls, the two relatively thin steel plates spaced apart withstand a sufficiently large internal pressure and maintain airtightness. By filling the inside of the double steel plate wall with water for shielding, a radiation shielding effect equivalent to that of a conventional reinforced concrete reactor containment vessel can be exerted. Therefore, it is not necessary to use concrete for the construction of the containment vessel, so that the construction period is shortened and the construction cost can be reduced. Further, the effect as a cooling means of the containment vessel can be exhibited. Also, even if the reactor containment vessel is excessively affected by heat such that the shielding water evaporates, the shielding water does not run out inside the double steel plate wall, and the cooling effect is reduced. Can be enhanced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. The description of the same parts as those in the related art is omitted.
[0012]
FIG. 1 is a sectional view of a water-shielded reactor containment vessel according to the present invention. As shown in the figure, the water-shielded reactor containment vessel of the present invention has a double steel plate wall 2 composed of an inner shell 2b and an outer shell 2a. A stiffener (not shown) for increasing the bending rigidity of the double steel plate wall 2 is attached to the outer shell 2a and the inner shell 2b, and the reactor pressure vessel 1 is stored inside the stiffener when the internal pressure rises. It is designed to withstand internal pressure and maintain airtightness. Further, a water inlet 3 is provided in the outer shell 2a of the double steel plate wall 2, so that the inside of the double steel plate wall 2 is filled with shielding water. Usually, it is sealed by a water inlet lock 9 provided in the water inlet 3.
[0013]
In general, it is known that the radiation shielding capacity of water is almost equivalent to that of concrete, and even if water is used as a substitute for concrete, it is necessary to change the thickness of the reactor containment wall. Absent. Further, there is no need to secure time until solidification like concrete, and it is easily available and inexpensive. Therefore, the construction period of the containment vessel can be shortened, and the construction cost can be reduced.
[0014]
In FIG. 1, 10 is a lower drywell access tunnel, 11 is a hatch for carrying in an upper drywell device, 12 is an airlock for upper drywell personnel, 13 is a suppression chamber doorway, 14 is an airlock for lower drywell personnel, Reference numeral 15 denotes a hatch for carrying a lower drywell device, 16 denotes a vacuum break valve, 17 denotes a reactor shield wall, and 18 denotes a bottom portion of the reactor containment vessel.
[0015]
FIG. 2 and FIG. 3 show a case where a water supply line for shielding is provided in the above-mentioned water shielded reactor containment vessel, and the reactor containment vessel exerts an excessive heat influence so that the shielding water 4 evaporates. This can be dealt with when it is received.
[0016]
FIG. 2 shows a first embodiment of the present invention, in which a siphon 5 is connected to a water inlet 3 and the tip of the siphon 5 is immersed in a temporary storage pool 6 provided in the upper part of the containment vessel. Further, the equipment temporary storage pool 6 and the double steel plate wall 2 are connected by the pipe 7 via the valve 19. With this configuration, even when the reactor containment vessel is excessively affected by heat such that the shielding water 4 evaporates, the steam is cooled from the siphon 5 to the equipment temporary storage pool 6 and recovered. Then, by opening the valve 19, the water in the equipment temporary storage pool 6 can be supplied into the double steel plate wall 2 as the shielding water 4. Further, normal-temperature water can be supplied as the shielding water 4, so that a cooling effect can also be exerted. In order to enhance the cooling effect and the like, a makeup water pool may be separately provided as the makeup water for the shielding water 4 instead of the water in the temporary storage pool 6, or a pump may be provided in the piping line. May be provided to positively supply the makeup water.
[0017]
FIG. 3 shows a second embodiment of the present invention, in which a siphon 5 is connected to the water inlet 3 and the tip of the siphon 5 is immersed in a temporary storage pool 6 provided at the upper part of the containment vessel. Further, a pipe 8 for supplying water to the middle of the siphon 5 is connected via a valve 20. With such a configuration, even if the reactor containment vessel is excessively affected by heat so that the shielding water 4 evaporates, the valve 20 is opened to cool the steam while cooling the double steel plate. Water can be supplied into the wall 2 and the containment vessel can be cooled.
[0018]
It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention, such as providing a water drain line for shielding on the outer shell of the double steel plate wall.
[0019]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the water shielding reactor containment vessel of this invention mentioned above, while having a radiation shielding effect equivalent to the conventional reinforced concrete reactor containment vessel, it is not necessary to use concrete for construction of a reactor containment vessel, The construction period is shortened, and construction costs can be reduced. Further, the present invention has an excellent effect that it can exhibit the effect as a cooling means of the containment vessel.
[Brief description of the drawings]
FIG. 1 is a sectional view of a water-shielded reactor containment vessel according to the present invention.
FIG. 2 is a view showing a first embodiment of a water shielding reactor containment vessel provided with a shielding water supply line.
FIG. 3 is a view showing a second embodiment of the water-shielded reactor containment vessel provided with a shielding water supply line.
FIG. 4 is a configuration diagram of a reactor containment vessel and a reactor building of a conventional ABWR.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reactor pressure vessel 2 Double steel plate wall 2a Outer shell 2b Inner shell 3 Water inlet 4 Shielding water 5 Siphon 6 Equipment temporary pool 7, 8 Piping 9 Water inlet lock 10 Lower drywell access tunnel 11 Upper drywell equipment Loading hatch 12 Upper drywell staff airlock 13 Suppression chamber entrance 14 Lower drywell staff airlock 15 Lower drywell equipment loading hatch 16 Vacuum break valve 17 Reactor shield wall 18 Reactor containment bottom 19, 20 Valve

Claims (1)

The reactor pressure vessel is housed inside and has a double steel plate wall that withstands internal pressure when the internal pressure rises and maintains airtightness. A siphon is connected to the water inlet, and the tip of the siphon is immersed in a temporary storage pool provided at the top of the reactor containment vessel. A water supply reactor containment vessel, wherein a pipe for supplying water for shielding is connected to the containment vessel.

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