JPS6095395A - Receiving storage facility for used fuel - 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 facility for receiving and storing spent fuel from a nuclear reactor used in a nuclear power plant.

[Technical background of the invention and its problems]

Fuel used in nuclear power plants is reprocessed at a dedicated factory in order to separate and extract active components such as uranium and nordonium contained in the spent fuel.

Usually, spent fuel assemblies are stored in specially constructed containers (hereinafter referred to as "casks") and transported from nuclear power plants to reprocessing plants. This cask is equipped with a cooling mechanism to release the heat generated by the fuel assemblies stored inside to the outside.As the cooling mechanism, an air-cooled cooling system or a water-cooled cooling system is generally adopted. ing.

An air-cooled cooling mechanism consists of a cask in which air or nitrogen gas is sealed inside and radiation fins are attached to the outside, while a water-cooled cooling mechanism usually has a structure in which circulating water is supplied inside the cask. It consists of

The fuel assemblies housed in casks and transported to a reprocessing plant are removed from the casks and temporarily stored in a fuel storage pool to undergo chemical treatment at the reprocessing plant. The work of removing this fuel assembly from the cask is as follows:
Because of the constant risk of radiation exposure, special spent fuel reception and storage facilities are attached to reprocessing plants.

The above-mentioned 2 facilities will be used as the receiving and storage facility for this spent fuel.
The system is designed to be able to accept and process casks using any type of cooling method, and there is a dry fuel handling facility that handles air-cooled casks and a wet fuel handling facility that handles water-cooled casks. has been done.

FIG. 1 is a plan view showing a spent fuel receiving and storage facility developed prior to the invention.

The receiving storage facility is cask storage room 10. It consists of fuel handling equipment and a fuel storage pool 40. The cask storage chamber 10 includes a fuel-loaded cask storage chamber 11 that stores casks (fuel-loaded casks) C containing a large number of fuel assemblies, and a fuel-loaded cask storage chamber 11 that stores casks C that store a large number of fuel assemblies, and an empty cask C' that is empty after the fuel assemblies have been taken out. It is separated into an empty cask storage room 12 for storage. There are two sets of rails 13 in one river between the fuel loaded cask storage room 11 and the empty cask storage room 12.
, 14 are respectively disposed toward the equipment 20 for handling Jouchijuku superior. Cask transfer carts 15 and 16 are movably mounted on these two sets of rails 13 and 14, respectively.

The fuel handling facility (Iiif 20 is equipped with 3 dry fuel handling facilities and wet fuel handling facility (+iff). It consists of an extraction preparation room and a dry fuel extraction cell, and the wet fuel handling equipment is also located in the Gotoyask decontamination room 32, gask temporary storage area 31゜δ゛, and wet fuel extraction noll, which are also arranged sequentially from the inlet O side. Cask transfer lanes b and 35 are provided above the dry fuel handling equipment and wet fuel handling equipment, respectively.The cask transfer lane 6 is connected to the population side by a cask transfer cart 16 The carried-in casks will be lifted up and transferred between the Yask temporary storage area 21, the Yask decontamination room 4, and the fuel removal preparation room. The casks transported to the population side by the transfer trolley 15 are lifted and moved to the cask temporary storage area 3.
1. Cask decontamination room 32. The transfer of casks between the fuel extraction semi-01U room 33 and the wet fuel extraction pool 34, where 1 field is transferred, is carried out between the 01 fuel extraction room 11β and the dry fuel extraction cell prisoner. will be carried out.

The fuel assembly taken out from the cask in the dry fuel removal cell or wet fuel removal] 0-ru 34 is
It is stored in a basket 36 and a nogsket transfer trolley 37
The fuel is then transferred to the fuel storage pool 40.

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The two piles of fuel assemblies are lifted up by a knoll crane 41, stored in storage gears 42 in a fuel storage pool 40, and stored until they are reprocessed.

In addition, the code|symbol 39 is a crane for work.

By the way, the number of fuel assemblies accepted and processed at such spent fuel receiving and storage facilities is generally one per day.
The number of cases is extremely small. Therefore, in the above-mentioned receiving and storage facilities, either the dry fuel handling equipment or the wet fuel handling equipment is always unused, and it is difficult to install each equipment completely separately and independently. This results in extremely low operating rates.

Furthermore, as the entire facility becomes larger, it also causes an increase in costs. In particular, it is extremely uneconomical to install two cask transfer lanes, which are costly and require maintenance.

[Purpose of the invention]

The present invention has been made in consideration of these points,
'i@' to reduce installation space and improve operating rate
A;'-)-'s purpose is to provide a t2 facility for small people with a 7% entry-level furnace and used supplies.

[Summary of the invention]

The present invention utilizes a dry fuel handling facility, which is equipped with a cask decontamination room, a fuel removal preparation room, and a dry 11λ fuel removal cell, by receiving casks stored in a cask storage room using a cask transfer cart and using a cask transfer lane. D1u
Alternatively, the spent fuel is transferred to the wet fuel handling facility IM, which is equipped with a cask decontamination room, a fuel removal preparation room, and a wet fuel removal boule, and the spent fuel is removed from the cask, and the removed spent fuel is transferred to the fuel gauge EJ2 pool. A spent fuel receiving and storage 11Ii facility for transporting and storing,
The cask decontamination room and the fuel removal sub-11iif room of the dry fuel handling equipment are shared with the cask decontamination room and the fuel removal room 01η of the wet fuel handling equipment.

In the present invention, by sharing the cask decontamination room and the fuel removal preparation room, the installation space for equipment is reduced, and the facility can be operated efficiently.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a plan view showing an example of a spent fuel receiving and storage facility according to the present invention, FIG. 3 is a cross-sectional view taken along the line O+N in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. .

The receiving and storage facility consists of a cask storage room 101, glaze case 31, handling equipment 50, and fuel storage boule 40. The cask storage room 10 is separated into a fuel-loaded cask storage room J and an empty cask storage room 12, as in the example described above. In this embodiment, a decontamination inspection bit 15 is provided near the entrance (or exit) of the empty gask storage chamber 12 (see also FIG. 4). This decontamination inspection bit 15 is used to perform a radioactivity test again and perform λ decontamination work when the empty cask C' after fuel removal is transported from the reception storage &2ii1i facility for the purpose of reuse. be. Incidentally, reference numeral 16 is a crane, which performs operations such as lifting and lowering casks brought in using a trailer or the like. Also, code 17 (Figure 3, Figure 4)
is a cask transfer cart 17 that transfers casks within the gear storage room 10.

The fuel handling equipment 50 arranged between the cask storage room 10 and the fuel storage boule 40 is surrounded by a concrete wall 51, and has dry fuel handling equipment and wet fuel handling equipment installed inside. . The fuel handling equipment 50 has a cask temporary storage area 52. Fuel extraction semi-flti chamber 53. A cask decontamination chamber 54, a cask transfer bit 55, and the like are provided. These arrangements are
The position is not limited to that shown in FIG. 2, and the position can be changed as appropriate. In addition, the cask temporary storage area 52 is provided to ensure that the entire processing process is carried out smoothly, and is used to temporarily store casks C for the next process, or to temporarily store casks C after fuel removal. This is used when the cask C' is temporarily placed there before being carried out. The fuel removal preparation chamber 53 is used to inspect the leakage of radioactive substances from the fuel assembly by sampling the air or water inside the cask.

In addition, the cask decontamination room is for decontaminating radioactive materials etc. attached to the outside of the cask.
It is installed below the floor as shown in the figure. In this embodiment, the above-mentioned cask temporary storage area 52. The fuel removal preparation room and cask decontamination room 54 can be shared by dry fuel handling equipment and wet fuel handling equipment so that casks containing either dry or wet fuel can be handled. The cask transfer bit 55 is provided under the floor surface and is connected to a dry fuel extraction cell 60 by a tunnel wing as shown in FIG. Using the stand 4159, it can be transported to a position directly below the manhole 61 of the dry fuel extraction cell ω.

The dry fuel extraction cell 60 is surrounded by a concrete wall 62 and is completely cut off from the outside.

Inside the dry fuel extraction cell ω, there is an automatic fuel extraction machine 63 with a running lane. Temporary fuel storage area 64 where the removed fuel assemblies are placed. A fuel transverse distortion boat 65 and the like are provided to inspect the removed fuel assembly for damage, etc.

Reference numeral 70 is a wet fuel removal sol that is a component of the wet fuel handling equipment. In the wet fuel extraction sol 70, water is stored in a sol provided under the floor surface, and fuel extraction work is performed in this water. The wet fuel removal grouper 0 has a running lane 71. A temporary fuel storage area 72 and the like are provided.

A canal (water channel) 75 communicating with the fuel storage sol 40 is provided on the lower surface of the dry fuel extraction cell 60 and the wet fuel extraction grouper 0, and the extracted fuel assembly is stored in this canal 75. A Nono Sket e transport truck 37 for transporting the Sket 36 is arranged to be able to travel underwater.0 A fuel loaded cask storage room 11 is used to transport the casks from the cask storage room 10 to the vicinity of the population between the fuel handling facilities.
A set of rails 17 is provided between the empty cask storage chamber 12 and the empty cask storage chamber 12, and a cask transfer trolley 57 is placed thereon so as to be able to reciprocate.

The cask C carried in horizontally by the cask transfer trolley 57 is lifted by the cask transfer lane with the cask lid side up, and is transferred to a predetermined location in the fuel handling facility.

This cask transfer lane 56 is connected to the cask temporary storage area 52.
, fuel removal preparation room 53. Cask decontamination room 54. Although it must be possible to move between the cask transfer bit 55 and the predetermined positions of the wet fuel removal pool 70, in this embodiment, the cask temporary storage area 52. Fuel removal preparation room 53. Since the cask decontamination room 54 and the like are shared and the above-mentioned components are arranged within a substantially rectangular area, only one cask transfer lane 56 is sufficient.

As in the example shown in FIG. 1, the fuel storage sol 40 is connected to a mail crane 41. Cranes 41, 71, and automatic fuel take-out machine 63 are equipped with fuel storage devices such as Tux 42.
The crane only needs to be capable of lifting fuel assemblies or baskets containing fuel assemblies, and needs to be smaller than cask transfer lane cranes.

Next, the operation of this embodiment having such a configuration will be explained.

First, the fuel-loaded cask C transported by a trailer or the like is unloaded from the trailer using a crane 16 or the like, and stored horizontally in the fuel-loaded cask storage room 11 by the cask transfer cart 17. The casks C stored in the fuel loading cask storage room 11 are sequentially transferred to fuel handling equipment (materials) by the cask transfer cart 57.
will be transported to. The casks delivered to the fuel handling facility are lifted up by the cask transfer lane 56.
The cask is temporarily stored in a temporary cask storage area 52 as needed. Next is the fuel removal preparation room 53. The cask will be transferred to decontamination room M and will be refurbished. This cask transport work is
This is done by a cask transfer lane 56. Cask C
If the cask is of an air-cooled type, the cask is then carried into the transfer pit 55 and passed through the tunnel 58 to the transfer cart 5.
9, it is transported to a position directly below the manhole 61 of the dry fuel extraction cell ω. Cask C is a dry fuel extraction cell ω
By removing the cask lid and manhole 61, the inside of the cask is opened into the dry fuel extraction cell 60. In this state, the fuel assembly inside the cask is taken out by an automatic fuel take-out machine 63 and placed in a temporary fuel storage area 64. In this manner, by allowing only the upper opening of the cask to face the inside of the dry fuel extraction cell 60, radioactive substances within the cask are prevented from leaking and contaminating the outer circumference of the cask.

As a method for extracting fuel from inside the cask, water is stored in this pond in a dry fuel extraction cell 60, and when the manhole 61 is removed, water is injected only into the cask, and the water is injected. Another option is to extract the fuel. After the fuel assembly taken out from the cask is inspected by a fuel inspection boat 65, it is stored in a basket 36 and conveyed to the fuel storage pool 40 by a transfer truck 37 through a canal 752.

On the other hand, if the cask C is water-cooled, it is transferred from the cask decontamination chamber 54 to the wet fuel removal guru 0. In the wet fuel removal gourer 0, fuel is removed from the cask by underwater work and is stored in a basket 36. The basket 36 is then transported by the transfer cart 37 through the canal 75 to the fuel storage pool 40, and the fuel is extracted from the basket 36 using the pool crane 41 and stored in a predetermined storage box 42. In addition, since the basket transfer cart 37 moves underwater, it is preferable to index the loaf using external power. Cask C
' is transferred to the cask decontamination room 54 by the cask transfer lane island, and after being decontaminated, the cask transfer cart 57
The cask is transported to the empty cask storage room 12 and stored there. When the empty casks are carried out of the facility from the storage room 12, they are once decontaminated and inspected in the decontamination inspection pit 15, as described above.

〔Effect of the invention〕

As explained above, according to the present invention, the fuel removal preparation room and the cask decontamination room in the fuel handling equipment are shared by the dry fuel handling equipment and the wet fuel handling equipment, so the equipment installation space is It is possible to reduce the size of the facility and improve the facility operating rate. Further, according to the present invention,
One cask transfer lane is installed in the fuel handling equipment, and it is used for both cask transfer to the dry fuel handling equipment and wet fuel handling equipment, so the cask transfer lane equipment In addition to simplifying the process, it is also effective in reducing installation space and labor-saving maintenance.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a conventional spent fuel receiving and storage facility, Fig. 2 is a plan view showing a spent fuel receiving and storage facility according to the present invention, and Fig. 3 is a sectional view taken along the line III-III in Fig. , FIG. 4 is a cross-sectional view of the rVIV gland in FIG. 2. 10... Cask storage room, 40... Fuel storage pool. 50...Fuel handling equipment, 53...Fuel removal preparation room. 8... Cask decontamination room, 56... Cask transfer lane. 57... Cask transfer trolley, 60... Dry fuel extraction cell. 70... Wet fuel removal pool, 75... Canal. C...Kyo Fl loading cask, C'...empty cask. Applicant's agent Inomata Sei Proceedings No. 111 (Method) February 10, 1980 Commissioner of the Patent Office Kazuo Wakasugi 1 Indication of the case 1981 Patent Application No. 204314 2 Name of the invention Spent fuel Acceptance storage facility 3 Relationship with the person making the amendment Case Patent applicant (307) Tokyo Shibaura Electric Co., Ltd. 4 Agent population Hwa January 11, 1959 (Shipping date 1 January 31, 1959) 6 Amendment Target statement of

Claims (1)

[Scope of Claims] 1. A cask transfer vehicle receives casks stored in a cask storage room, and a cask transfer lane is used to provide a cask decontamination room, a fuel removal preparation room, and a dry fuel handling cell. Dry fuel handling equipment or cask decontamination room. Spent fuel is transferred to a wet fuel handling facility equipped with a fuel removal preparation room and a wet fuel removal pool, the spent fuel is removed from the cask, and the removed spent fuel is transferred to a fuel storage pool for storage. 2. A spent fuel receiving and storage facility, characterized in that the cask decontamination room and the fuel removal preparation room are shared by dry fuel handling equipment and wet fuel handling equipment. The spent fuel receiving and storage facility according to claim 1, characterized in that it is shared by a wet fuel handling facility and a wet fuel handling facility.