JPS59211894A - Reactor building - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a reactor building for, for example, a tank-type fast breeder reactor.

Technical Background of the Invention A conventional example will be explained with reference to FIG. Reference numeral 1 in the figure indicates a reactor building consisting of an internal building 2 having a crane room and an external building 3 that is integrally constructed surrounding the internal building 2. The inner building 2 and the outer building 3 are built independently on a common base mat 4. The structures of the internal building 2, external building 3, and base mat 4 are mainly made of reinforced concrete, and the pace mat 4 is made of solid rock 18.
It is poured on top. A reactor vessel storage chamber 5 called a reactor vessel wall is provided in the lower part of the internal building 2, and above it is a lane room. A nuclear reactor vessel 6 is accommodated within this accommodation chamber 5 . Inside this reactor vessel 6 is a reactor core 7.
is arranged and filled with liquid sodium 8 as a coolant. The upper opening of the reactor vessel 6 is shielded by a roof slab 9 and kept airtight. This rule
An intermediate heat exchanger 10, a core upper mechanism 11, a primary cooling pump (not shown), etc. are disposed inside the reactor vessel 6, penetrating the front slab 9.

A liner 12 made of a steel plate is stretched over the inner surface of the storage chamber 5 to improve the airtightness of the storage chamber 5.

Further, a predetermined space is maintained outside the containment chamber 5 and a reactor containment vessel 13 is provided, but this containment vessel 13 is fixed on a common pace mat 4 like the containment room 5 and the external building 3 and is independent. .

Outside the reactor containment vessel 13, there is a secondary containment area 14 in which a negative pressure atmosphere is maintained in the inner building 2 in case of leakage of radioactive materials. The crane support wall 1 of the crane room forms the boundary.
5, and the support wall 15 has an integral structure with the external building 3 and is made of reinforced concrete.

A working crane 16 is installed in the crane room at the top of the reactor containment vessel 13, and the crane 16 can move over the intermediate heat exchanger 10 and other contents inside the reactor vessel 6 and the roof slab 9. It is constructed to be able to lift heavy objects.

In addition, a machine hatch 17 is provided at the top of the reactor containment vessel 13.
The hatch 17 is engaged with the containment vessel 13 by a flange, and can be removed or fixed by tightening or loosening bolts and nuts.

By the way, in the reactor building in which the inner building 2 and the outer building 3 including the reactor vessel 6, accommodation chamber 5, and crane support wall 15 are constructed independently and independently on the common pacemat 4, When an earthquake occurs, the crane support wall 15 in the crane room has a considerable height, so the vibration becomes intense, and this vibration causes the entire external reactor building 3 to vibrate, causing damage to the containment chamber of the reactor vessel wall through the base mat 4. 5's vibrations also tend to become more intense.

Problems with the Background Art The containment chamber 5 and reactor containment vessel 13 of the containment vessel wall are required to have high seismic strength in order to ensure safety in the event of an earthquake. However, as mentioned above, the reactor housing wall 5 is susceptible to the effects of the walls of the internal building 2 and the external building 3, and it is difficult to increase the seismic strength to meet the requirements of major equipment, including the reactor vessel 6. It is necessary to have an extremely thick structure to increase rigidity, or conversely, to have an extremely thin wall structure to make it flexible.

These are selected depending on the characteristics of the ground.

However, in the former case, there is a problem that not only does the cost increase due to the increase in material quantity, but also thermal stress is likely to occur when the atmospheric temperature inside the reactor vessel storage chamber 5 increases. There is a possibility of buckling due to vibrations, etc., and each has disadvantages that are technically undesirable.

OBJECT OF THE INVENTION An object of the present invention was to eliminate the above-mentioned drawbacks, and to provide a small reactor containment vessel and a nuclear reactor without impairing the functions required of a reactor vessel storage chamber that houses a reactor vessel. The goal is to provide a building.

Summary of the Invention The reactor building according to the present invention has a base mat for the reactor vessel housing chamber and the reactor containment vessel on the reactor vessel wall, which are particularly important parts in terms of seismic design, in a tank-type fast breeder reactor, and the base mat of the reactor vessel wall, which is an important part in terms of seismic design. On the other hand, the base mats of the external building, which have a relatively large margin, are made independent from each other, so that the vibrations of the external building are not transmitted to the wall of the furnace vessel. Furthermore, by using a vibration interference agent in combination, the earthquake resistance is further improved.

The present invention provides a base mat laid out on bedrock, a reactor vessel housing chamber laid out on this pacemat, a reactor containment vessel built surrounding this reactor housing chamber, and a reactor containment vessel built around this reactor housing chamber. In a reactor building that includes an internal building that is erected to surround a reactor containment vessel, and an external building that is erected to surround the outside of this internal building, the inner building and the reactor containment vessel are This nuclear reactor building is characterized in that a vertical gap is provided in the base mat area between the nuclear reactors and the gap is filled with an airtight material.

Embodiment of the Invention An embodiment of a nuclear reactor building according to the present invention will be described below with reference to FIG. In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals and will be explained.

The difference between the present invention and the conventional example is a region 21 of the base mat 4a between the reactor containment vessel 13 and the wall 15 of the internal building 2.
A vertical gap 22 is provided in the air gap 22, and an airtight material 23 is filled in the gap 22. That is, in FIG. 2, the reactor building 20 according to the present invention has a base mat 4 in the area where the reactor accommodation chamber 5 and the reactor containment vessel 13 are supported and fixed.
A and the wall 15 of the internal building 2 and the base mat 4b in the area for supporting and fixing the external building 3 are separated to form a gap 22, and this gap is filled with an airtight material 23 such as silicone rubber. These base mats 4a, 4b are erected on solid rock 18.

On the base mat 4a, a reactor housing chamber 5 on the reactor vessel wall is free-standing as in the conventional example, and a reactor vessel 6 is supported and fixed at the upper end of the reactor housing chamber 5 on the vessel wall. . The opening at the upper end of the reactor vessel 6 is shielded by a roof slag 9 and kept airtight.
An intermediate heat exchanger 10, a core upper mechanism 11, a primary coolant pump (not shown), etc. are accommodated in the reactor vessel 6 through the reactor vessel 6. Note that a reactor core 7 is disposed inside the reactor vessel 6, and liquid sodium 8 as a primary coolant of the reactor core 7 is disposed inside the reactor vessel 6.
is fulfilled.

In order to maintain the airtightness of the reactor housing chamber 5, a liner 12 made of a steel plate is stretched over its inner surface.

Outside the reactor containment vessel 13, there is a secondary storage area 14 that maintains a negative pressure atmosphere in case of leakage of radioactive materials.
A crane support wall 15 forms the boundary between the area 14 and its outer atmosphere, and this support wall 15 is integrally constructed with the external building 3.

This external building 3 is made of reinforced concrete and stands on a base mat 4b.

The gap 22 between the pacemats 4a and 4b is kept airtight by a flexible airtight material 23. This airtight material 23 is attached to the secondary storage area 14 together with the crane support wall 15.
It forms part of the boundary that forms the area, and is provided for the purpose of preventing groundwater from entering the interior.

Additionally, a working crane 16 is installed above the reactor containment vessel 13.
is installed, and the intermediate heat exchanger 10, etc., the roof
It is configured to lift a heavy object on the slab 9.

For this purpose, the upper end of the reactor containment vessel 13 has a machine hatch 17 that can be attached or detached by operating bolts and mats.

The configuration as described above has the following effects.

First, when an earthquake occurs, the crane support wall 15, which is structurally flexible and has a high center of gravity, vibrates violently, as in the conventional case. External building 3 is integrated with 15.
Since the crane support wall 15 is erected on a pace mat 4a independent from the crane support wall 15, vibrations of the crane support wall 15 are not transmitted to the accommodation chamber 5 side. Furthermore, the center of gravity of the containment chamber 5 is extremely low, and the vibration caused by an earthquake is much gentler than that of the crane support wall 15. This makes it possible to achieve an extremely appropriate design.

In the conventional example, under the geological conditions of soft ground, the containment chamber 5 has an extremely thick structure, and as a result, the reactor containment vessel 13
The increase in the size of the storage chamber 5 and the increase in the size of the external building outside it have led to an increase in costs, and there have been problems in that the storage chamber 5 itself tends to be disadvantageous in terms of thermal stress.However, the present invention solves these problems. I can solve the points.

3 and 4 are sectional views showing only essential parts of other embodiments of the present invention, and parts overlapping with FIG. 2 are omitted.

FIG. 3 shows a nuclear reactor building characterized in that a horizontal recess 24 is provided between the base mat 4a and the rock 18, and a vibration damping material 25 such as spring elasticity or liquid is provided in the recess 24. It is. Figure 4 shows base mat 4
This nuclear reactor building is characterized in that a horizontal recess 26 is provided within the recess 26, and a vibration damper 25 is provided within the recess 26.

The recesses 24,26 formed in FIGS. 3 and 1 communicate the vertical gap 22.

These are selected depending on the ground conditions and the specificity of the plant, but in the case of Figure 3, the vibrations of the rock 13 itself are not directly transmitted to the reactor containment vessel 13, containment chamber 5, etc., and the vibrations are transmitted to them. It is effective for further easing the problem, and the case of FIG. 4 is effective in cases where there is no need to create a structure like the embodiment shown in FIG. 2 or 3.

Effects of the Invention As explained above, according to the present invention, the pacemat in the area where the containment chamber for accommodating the reactor vessel and the reactor containment vessel are erected and supported and fixed, and the interior space surrounding the reactor containment vessel. This is a nuclear reactor building in which the pace mat in the area where the crane support wall of the building and the external building are erected and supported and fixed is separated, each independent, and an airtight material is loaded between the mats. Therefore, since the crane support walls of the internal building vibrate independently during an earthquake, the accommodation system that supports the reactor is not affected by the crane support walls. Furthermore, even if the crane support wall is subject to severe vibrations, countermeasures that meet the requirements of the reactor structure can be easily taken by changing the structure of the crane support wall.

In addition, without increasing the size of the reactor containment vessel and reactor building, it is possible to easily design earthquake resistance, reduce construction costs, and improve the reliability of the reactor containment room and reactor, which has a large effect. It is.

Furthermore, by combining structures as shown in the examples shown in Figures 3 and 4, it is possible to select a structure that matches the ground characteristics of the construction site of the plant, providing flexibility in seismic design and improving construction efficiency. This is extremely effective in reducing costs and improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a conventional reactor building, FIG. 2 is a vertical cross-sectional view showing an embodiment of a nuclear reactor building according to the present invention, and FIG.
4 and 4 are longitudinal cross-sectional views showing only essential parts of another embodiment of the present invention. 1...Reactor building 2...Inner building 3...
External building 4...Base mat 5...Reactor vessel accommodation chamber 6...Reactor vessel 7...Reactor core
8... Liquid sodium 9... Roof slab 10... Intermediate heat exchanger 11... Core upper mechanism 12... Liner 13... Reactor containment vessel 14
...Secondary storage area 15...Crane support wall 16.
...Working crane 17...Machine hatch 20...Reactor building 21 of the present invention...Void area 22...Void area 23...
・Airtight material 25...Vibration buffer material 24, 26・
・・Horizontal recess Application agent Patent attorney Goro Kikuchi No. 3 Illustration 4 Illustration special WUI; Director Kazuo Wakasugi 1
, Indication of Matter A'I 1981 Special Application No. 85) No. 766 2, Name of Invention Reactor Building 3, Relationship with the Amendment Author Case! lh revision application applicant Kawasu fl 72 Horikawa, Kawayoyamasai-ku (307) Tokyo Shibaura Electric Co., Ltd. Representative name: Tadashi Buddha - (1 other person) 4, Agent 5, Supplementary! , E, Q Order Day A.1 7. Contents of amendment

Claims (5)

[Claims] (1) A base mat placed on the bedrock, a reactor vessel containment chamber erected on this base mat, a reactor containment vessel built surrounding this reactor containment room, and a reactor containment vessel built around this reactor containment room, In a reactor building comprising an internal building erected surrounding a reactor containment vessel and an external building erected surrounding the outside of this internal building, the space between the internal building and the reactor containment vessel is A vertical void is provided in the base mat area of
A nuclear reactor building characterized by filling this void with an airtight material. (2) The reactor building according to claim 1, wherein the airtight material is made of silicone rubber. (3) A patent characterized in that a horizontal recess communicating with the void is provided between the base mat and the rock in the area where the internal building is separated, and a vibration damping material is loaded into the recess. A nuclear reactor building according to claim 1. (4) The reactor building according to claim 3, wherein the vibration damping material is made of a spring elastic body or a liquid. (5) The atom according to claim 1, characterized in that a horizontal recess is formed in the base mat that stands up in the internal building, and a vibration damping material is loaded in the recess. Furnace building.