JPS61191995A - Containment facility for nuclear reactor - 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 [Technical Field of the Invention] The present invention relates to a nuclear reactor containment facility, and particularly to a nuclear reactor containment facility that isolates a nuclear reactor from the outside in the event of an accident and limits the release of radioactivity to the outside environment.

[Technical background of the invention and its problems]

For example, in a boiling water reactor for power generation, the reactor containment facility usually consists of a reactor containment vessel that houses the reactor, and a reactor building that houses this reactor containment vessel.

Furthermore, it is equipped with emergency gas treatment equipment to treat the air inside this reactor building, so in the event of a reactor accident, the reactor can be doubly isolated from the outside by the reactor containment vessel and the reactor building. Furthermore, the structure is such that any minute amount of radioactivity leaking from the reactor containment vessel into the reactor building is treated by emergency gas processing equipment to limit the release of radioactivity to the outside environment. In order to effectively perform the functions described above, emergency gas processing equipment is designed to process relatively low-temperature gas, and is not configured to process high-temperature gas. do not have.

By the way, unexpected situations such as a situation in which a large amount of gas is injected into the reactor containment vessel, a situation in which the containment vessel spray system becomes inoperable in the event of a coolant leak accident, or a situation in which a large amount of gas is injected into the reactor containment vessel, Assuming that a situation occurs in which hydrogen gas is generated, the air inside the reactor containment vessel must be will be released to the outside.

On the other hand, if such an unexpected situation occurs, the yK reactor containment vessel is configured to be automatically isolated as the pressure increases, so the cooling system for cooling the gas inside the reactor containment vessel is will also cease to function. As a result, the gas inside the reactor containment vessel will be warmed by heat radiation from the reactor, and its temperature will rise, so such high-temperature gas must be treated by emergency gas processing equipment and released to the outside. I can't. Therefore, in such a case, one possible way to release the gas in the reactor containment vessel is to use a path leading to the purge fan, but this method does not allow the reactor to be removed from the outside in the event of an unexpected situation such as the one described above. Overall, it can be said that the release of radioactivity into the external environment can be suppressed to a minimum. Therefore, a sufficient effect of removing radioactivity cannot be expected compared to releasing it using emergency gas processing equipment.

[Purpose of the Invention J The present invention was made in view of the above circumstances, and its purpose is to prevent the gas from leaking to the external environment even if the above-mentioned unexpected situation occurs when the temperature of the gas in the reactor containment vessel is high. The objective is to provide a nuclear reactor containment facility that does not release radioactivity.

[Summary of the invention]

In order to achieve the above object, the present invention provides a reactor containment vessel that houses a nuclear reactor, a reactor building that houses this reactor containment vessel, and an emergency gas treatment system that processes gas in this reactor building. In a reactor containment facility equipped with equipment, a pool is installed in the reactor building, and a release piping system is installed to connect the pool and the reactor containment vessel, and The gas can be discharged into the pool water through the discharge piping system.

[Embodiments of the invention]

Embodiments of the present invention will be described with reference to the drawings.

The figure shows a schematic layout of an embodiment of the present invention. As shown in the figure, a reactor containment vessel 2 containing a nuclear reactor 1 is installed at a predetermined location within a reactor building 3. Emergency gas treatment equipment 4, which will be described later, is provided to treat the gas within this reactor building 3. This emergency gas processing equipment 4 includes an emergency gas processing equipment 7 installed outside the reactor building 3, a suction piping system 8 from the reactor building 3, a suction piping system 9 from the reactor containment vessel 2, and a suction piping system 9 from the reactor containment vessel 2. It is composed of a piping system 9 and a piping system lO connecting the suction piping 8.

Further, the gas in the reactor containment vessel 2 is configured to be discharged by a purge fan 6 via a suction piping system 9 and a piping system 11 branching from this piping system 9. Furthermore, a discharge piping system 12 is provided which branches from the suction piping system 9 and is connected to the pool 5 disposed within the reactor building 3, and a discharge port 13 is provided in the pool water of this piping system 12.

In the reactor containment facility of this embodiment configured as described above, for example, if the temperature of the gas in the reactor containment vessel 2 is high, and under this condition an unexpected situation as already described occurs. The high-temperature gas in the reactor containment vessel 2 is released into the pool water from the outlet 13 via the suction piping system 9 and the discharge piping system 12, so the released gas is cooled by the pool water and then becomes atomic. It is released into the furnace building 3.

After that, the emergency gas treatment device 7 is passed through the suction piping system 8.
After the radioactivity in the gas is removed, it is released into the external environment.

Therefore, soluble radioactive substances and the like are absorbed and removed into the pool water during gas-liquid contact in the pool water, which can contribute to further suppressing the release of radioactivity into the external environment. Moreover, if it is necessary to increase the solubility of the soluble radioactive substance, a methyl iodide solution or the like can be used as the pool water.

Incidentally, in the above embodiment, a case has been described in which the discharge piping system 12 leading to the pool 5 is branched from the conventionally installed suction piping system 9, but the arrangement relationship between the reactor containment vessel 2 and the pool 5 is Depending on the situation, it is of course possible to install a piping system that directly connects the two, but the point is that the structure may be such that the gas in the reactor containment vessel can be discharged into the pool water if necessary. Further, the pool may be a fuel storage pool or a temporary equipment storage pit installed in the reactor building, or may be newly installed.

Furthermore, if the amount of gas released is large, the pool needs to be cooled, and in this case, an existing fuel storage pool cooling device may be used, or a new cooling device may be installed.

〔Effect of the invention〕

As explained above, according to the reactor containment facility of the present invention, even if the temperature of the gas in the reactor containment vessel is high and an unexpected situation that causes the release of this high temperature gas occurs, the high temperature Since the gas is released into the pool water, cooled to a predetermined temperature, and then released through the emergency gas processing equipment, it is possible to significantly reduce and suppress the release of radioactivity into the external environment.

[Brief explanation of drawings]

The figure is a schematic layout diagram of an embodiment of the present invention. 1... Nuclear reactor 2...Reactor containment vessel 3...Reactor building 4...Emergency gas processing equipment 5...pool 8.9...Suction piping system 12...Discharge piping system

Claims (3)

[Claims] (1) Reactor containment facility equipped with a reactor containment vessel that houses a nuclear reactor, a reactor building that houses the reactor containment vessel, and emergency gas processing equipment that processes gas within the reactor building. A pool is installed in the reactor building, and a release piping system is provided to connect the pool and the reactor containment vessel, and the gas in the reactor containment vessel is transferred to the pool through the release piping system. A nuclear reactor containment facility characterized by being able to release water into the water. (2) The reactor containment facility according to claim 1, wherein the pool is a fuel storage pool or a temporary equipment storage pit. (3) The reactor containment facility according to claim 1, wherein cooling water or methyl iodide solution is used as the pool water.