JPH09292488A - Storage for spent nuclear fuel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage for spent nuclear fuel which has high heat- removing performance and can make effective use of the waste heat from the spent nuclear fuel. SOLUTION: This storage for spent nuclear fuel consists of a chamber 3 with an air inlet 1 and an air outlet 2. In the chamber 3, housing pipes 5 for spent nuclear fuel, heat-releasing fins 4 installed on the housing pipes 5, louvers 6 and vaporizing sides 7 of heat pipes are provided. The heat-releasing fins 4 are horizontally placed, and baffle plates of the louvers 6 are directed downward from the horizontal position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry storage container for spent nuclear fuel, which is capable of standing and storing a plurality of containers, which have been taken out of a nuclear reactor and which contain spent nuclear fuel having heat generation. Regarding

[0002]

2. Description of the Related Art As a conventional spent nuclear fuel storage,
There is a structure as disclosed in Japanese Patent Laid-Open No. 7-333385, which is made of a radiation shielding material, as shown in FIG. 2, through which air circulates and is discharged from the air discharge port 8. It has a chamber 9 configured as described above, and a storage pipe 10 which is disposed inside the chamber while containing the spent nuclear fuel, and cooling air flows into the chamber from the air introduction port 11. , While taking heat from the storage pipe 10 in which the exothermic spent nuclear fuel is stored and raising the temperature,
The storage pipe 10 is cooled by flowing upward in the direction of arrow 12 mainly by the rising airflow due to the temperature rise and the flow from the air introduction port 11 to the air discharge port 8 and flowing out from the air discharge port 8. It was supposed to be.

[0003]

As described above, in the conventional spent nuclear fuel storage, the cooling air inside the chamber gradually rises in temperature, and is directed from the air inlet 11 to the air outlet 8. Flowing. However, there is a problem in that high-temperature cooling air stays above the inside of the chamber, the temperature distribution inside the chamber becomes non-uniform, and the heat removal performance of the storage pipe deteriorates. Further, as disclosed in Japanese Utility Model Laid-Open No. 61-119798, there is an example in which a cooling fin is provided in a spent nuclear fuel storage container, but the cooling fin is provided in the vertical direction on the outer peripheral portion of the storage pipe. , When used in the spent nuclear fuel storage, the pressure loss is increased to reduce the flow rate of the cooling air, which promotes the retention of the heated cooling air above the chamber, which lowers the heat removal performance. There was a problem.

Further, as is well known, there has been an attempt to arrange a louver inside the chamber near the inlet of the cooling air to rectify the cooling air and make its flow horizontal. However, as the temperature of the cooling air rises toward the upper part of the chamber as the temperature rises, it does not flow horizontally toward the outlet of the cooling air, and as a result, the temperature distribution inside the chamber becomes non-uniform and There was a problem that the thermal performance deteriorates. Further, even if the heat obtained by the cooling air from the storage tube for storing the spent nuclear fuel is simply released to the outside or recovered by the heat exchange means, the heat exchange means cools the heat exchange means in a known manner. Since it is arranged outside the chamber such as the air outlet for use, it did not contribute to the improvement of the heat removal performance itself.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to have a structure capable of effectively utilizing exhaust heat from a spent nuclear fuel as a heat source. , By eliminating the high temperature stagnant portion of the cooling air inside the chamber and making the temperature distribution of the cooling air inside the chamber more uniform, we will provide a spent nuclear fuel storage with a higher heat removal effect than before. It is what

[0006]

In order to achieve the above object, a spent nuclear fuel storage according to the present invention is made of a radiation shielding material, and air introduced from the outside flows through the inside and is discharged from an air outlet. In a spent nuclear fuel storage having a chamber configured to be discharged and a storage pipe that is disposed inside the chamber while containing the spent nuclear fuel, cooling air is provided on an outer peripheral portion of the storage pipe. It is characterized in that the heat radiation fins for rectifying the heat and for promoting the cooling of the storage pipe are attached in the horizontal direction.

Further, the spent nuclear fuel storage according to the present invention is further provided with a plurality of cooling air rectifying louvers inside the chamber.

In the spent nuclear fuel storage according to the present invention, a heat recovery heat pipe is further arranged inside the chamber.

[0009]

1 is a vertical sectional view of a spent nuclear fuel storage according to an embodiment of the present invention. The storage is made of a radiation shielding material and contains a chamber 3 in which cooling air flows in from an air inlet 1 and is discharged from an air outlet 2, and a spent nuclear fuel is accommodated.
A storage tube 5 arranged vertically inside the chamber 3 and having radiation fins 4 mounted horizontally, and the chamber 3
Louvers 6 arranged inside the room at appropriate intervals
And a heat pipe evaporation side 7 which is arranged inside the chamber 3 with an appropriate interval.

Since the embodiment of the present invention is configured as described above, the cooling air flows into the chamber 3 through the air inlet 1 and the storage pipe 5 in which the heat-generating spent nuclear fuel is stored.
The heat is taken from the air to raise the temperature, and the air is discharged to the air outlet 2. At this time, the heat of the spent nuclear fuel housed in the housing pipe 5 is efficiently transferred to the cooling air by the radiation fins 4, and good heat removal performance is obtained.

Further, since the heat radiation fins 4 are horizontally attached to the outer peripheral portion of the storage tube 5, the upward flow caused by the temperature rise of the cooling air is suppressed, and the heat radiation fins 4 are provided by the lower surface of the heat radiation fins 4. Guide horizontally to direct the cooling air flow generally horizontally. Therefore, a high temperature retention part of the cooling air does not occur in the upper part of the chamber, the temperature distribution of the cooling air inside the chamber becomes more uniform, and the heat removal performance is improved.

Further, as shown in FIG. 1, since the rectifier plate of the louver 6 is oriented downward from the horizontal position toward the air discharge port 2, the cooling air caused by the temperature rise is generated. The upward flow is effectively deflected in the horizontal direction, the temperature distribution of the cooling air inside the chamber 3 becomes more uniform, and the heat removal performance is further improved.

Further, as shown in FIG. 1, by disposing the evaporation side 7 of the heat pipe inside the chamber 3 and the condensation side of the heat pipe outside the chamber 3 (not shown), the spent nuclear fuel is contained. The thermal energy can be recovered from the storage pipe 10 for use in a facility (not shown).
Further, due to this heat exchange action, the degree of temperature rise of the cooling air is smaller than that in the case where the heat pipe is not arranged, and the heat removal performance is not deteriorated. Therefore, the amount of exothermic spent nuclear fuel inside the chamber, that is, the allowable amount of heat generation per unit area can be increased.

As described above, in the embodiment, the radiation fin 4 is fixedly arranged in the housing pipe 10, but it may be attached so that the angle can be adjusted so that the flow direction of the cooling air can be adjusted by remote control. Further, the heat pipe may be horizontally arranged inside the chamber, the straightening plate of the louver 6 itself may be provided on the evaporation side 7 of the heat pipe, or the heat receiving fins and the storage pipe on the evaporation side 7 of the heat pipe. The heat radiation fin 4 of 5 may be integrally configured.

[0015]

As described above, according to the present invention,
It is possible to provide a spent nuclear fuel storage that has high heat removal performance and can effectively utilize the heat generated from the spent nuclear fuel.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a spent nuclear fuel storage according to a preferred embodiment of the present invention.

FIG. 2 is a vertical sectional view of a spent nuclear fuel storage according to the related art.

[Explanation of symbols]

 1 Air Inlet 2 Air Outlet 3 Chamber 4 Radiating Fin 5 Storage Pipe 6 Louver 7 Evaporating Side of Heat Pipe 8 Air Outlet 9 Chamber 10 Storage Pipe 11 Air Inlet 12 Flow of Cooling Air

Continued Front Page (72) Inventor Tsutomu Sekikawa 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Metal Mining Co., Ltd. Energy & Environment Division Nuclear & Energy Department

Claims (3)

[Claims] 1. A chamber made of a radiation shielding material, configured to allow air introduced from the outside to flow through the inside and be discharged from an air outlet, and a spent nuclear fuel is accommodated in the chamber. In a spent nuclear fuel storage having a storage pipe disposed inside, a radiation fin for rectifying cooling air and for promoting cooling of the storage pipe is horizontally attached to an outer peripheral portion of the storage pipe. Characteristic spent nuclear fuel storage. 2. The spent nuclear fuel storage according to claim 1, wherein a plurality of cooling air rectifying louvers are provided inside the chamber. 3. The spent nuclear fuel storage according to claim 1, wherein a heat recovery heat pipe is arranged inside the chamber.