JPS6161097A - Receiving storage facility for spent 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]

The fuel used in nuclear power plants is reprocessed at a dedicated factory in order to separate and extract active components such as uranium and plutonium 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 assembly stored inside to the outside, and generally an air-cooled cooling mechanism or a water-cooled cooling mechanism is adopted as the cooling mechanism. There is.

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

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

This spent fuel receiving and storage facility is designed to be able to receive and process casks using either of the two types of cooling methods mentioned above. There is a wet fuel handling facility that handles handling equipment and water-cooled casks.

FIG. 3 shows a conventional spent fuel receiving and storing facility, which is equipped with a cask storage facility 1 and a spent fuel handling facility 2.

The cask storage facility 1 includes a used twisted Fl loading cask storage room 3 that stores casks containing a large number of fuel assemblies (fuel loaded casks), and stores empty casks from which fuel assemblies have been removed. It is equipped with an empty cask storage room 4 and a cask maintenance room 5, both storage rooms 3 and 4.
A cask transfer cart area 6 is provided in the cask maintenance room 5, and a cask transfer crane 9 for the cask maintenance room that moves along a cask maintenance/inspection area 7 and a crane rail 8 is provided in the cask maintenance room 5.

Further, the spent fuel handling equipment 2 includes wet fuel handling equipment and dry fuel handling equipment. The wet fuel handling equipment includes, from the cask transfer cart bit 10 side, a cask decontamination room 11, a fuel removal preparation room 12, a cask temporary storage area 13,
The dry fuel handling equipment consists of a cask decontamination room 17, a cask temporary storage area 18, and a dry fuel removal preparation room from the cask transfer trolley bit 10 side. It consists of a cask return preparation room 19, and a dry fuel removal cell 23 having a cask storage area 20, a temporary fuel storage area 21, and a fuel inspection boat 22. Cask transfer cranes 24, 25 moving along crane rails 24a, 25a are disposed above each of these fuel handling facilities.

The fuel assembly removed from the cask in the wet fuel removal boule 16 or the dry fuel removal cell 23 is
It is stored in a basket (not shown) and transferred to a fuel boule (not shown) via a basket transfer canal 26.

In the conventional spent fuel receiving and storage facility having the above configuration, a cask transfer crane for cask maintenance room 9,
3 of cask transfer crane 24 for wet fuel extraction equipment and cask transfer crane 25 for dry fuel extraction equipment
Equipped with a stand. For this reason, cask transfer is carried out using dedicated cask transfer cranes for cask storage, wet fuel handling, and dry fuel handling, and the downside is that the operating rate of cask transfer cranes is extremely low considering the amount of casks transferred. There is.

(Object of the invention) The present invention aims to improve the operating rate of a cask transfer crane,
The purpose of this project is to provide a spent fuel receiving and storage facility that can reduce construction costs, operating costs, etc. of the facility.

[Summary of the invention]

The present invention provides a common cask transfer crane that is integrally arranged between the cask storage facility and the spent fuel handling facility, so that cask lifting, suspension, and transfer operations at the cask storage facility and the spent fuel handling facility can be carried out. It is characterized by being able to carry out both cask transfer operations using the same cask transfer crane.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The spent fuel receiving and storage facility according to this embodiment is equipped with a cask storage facility 1 and a spent fuel handling facility 2, as shown in FIG. A common cask transfer crane 30 for performing cask transfer, lifting, and transfer is movably disposed along a crane rail 30a.

The cask storage facility 1 includes a spent fuel loaded cask storage v3, an empty cask storage room 4, and a cask maintenance room 5.
Both storage rooms 3.4 are provided with a cask transfer trolley area 6, and the cask maintenance room 5 is provided with a cask maintenance/inspection area 7.

The spent fuel @ cargo cask storage room 3 has a function of temporarily storing casks loaded with spent fuel sent from the outside by truck or cask transfer trolley and inspected in the cask maintenance room 5. Furthermore, the empty cask storage room 4 has a function of temporarily storing empty casks sent from the spent fuel handling equipment 2 by the cask transfer crane 30 and inspected in the cask maintenance room 5.

The cask maintenance room 5 has a function for maintaining and inspecting casks loaded with spent fuel sent from outside and empty casks sent by the cask transfer crane 30 from the spent fuel handling equipment 2. We are prepared.

On the other hand, the spent fuel handling equipment 2 is shown in FIGS.
As shown in the figure, it consists of a wet fuel removal boule 16, a dry fuel removal cell 23, a dry fuel removal preparation room, a cask return preparation room 19, a cask decontamination room 31, a cask temporary storage area, a fuel inspection and maintenance room 33, etc. There is.

As shown in FIG. 2, the wet fuel unloading boule 16 includes a cask storage area 14 for temporarily placing and inspecting casks sent by the cask transfer crane 30, and contains fuel taken out by a fuel unloading machine. It has a temporary fuel storage area 15 for temporarily storing the basket, and has a function of taking out the fuel and transferring the basket containing the fuel to the basket transfer truck.

In addition, the dry fuel extraction cell 23, as shown in FIG.
Cask storage area 20, temporary fuel storage llA21 for temporarily storing fuel taken out from the cask by an automatic fuel removal machine
, and a fuel inspection boat 22, and when removing fuel, it is completely isolated from the outside and has a function that all operations are performed automatically.

In addition, the dry fuel removal preparation room and cask return preparation room 19 transports casks lowered from the opening by the cask transfer crane 30 to the dry fuel removal cell 19, as shown in FIG.
3 and the empty cask from the dry fuel extraction cell 23 to the opening, respectively.

The fuel removed by the wet fuel removal boule 16 and the dry fuel removal cell 23 is transferred to a basket transfer canal 26.
A fuel storage facility (not shown) is provided by a basket transfer trolley.
It is now being transported up to.

Furthermore, the cask decontamination room 31 has a function of decontaminating casks emptied by the wet fuel removal boule 16 and the dry fuel removal cell 23, and the cask temporary storage area 32
In addition, it can be used for both wet and dry methods.

Further, the fuel inspection and maintenance room 33 has a function of performing maintenance on damaged fuel and the like.

The cask transfer crane 30 moves the cask maintenance/inspection area 7 of the spent kneading y1@cargo casks sent from the outside, the transfer trolley of the used area Fl loading cask storage room 3, and the dry fuel removal preparation room. Cask return preparation room 19, wet fuel removal boule 16, and cask temporary storage area 32, dry fuel removal preparation room and cask return rate i! Transfer of empty casks from chamber 19 and wet fuel removal boule 16 to cask temporary storage area 32 and cask decontamination room 31, and transfer of decontaminated casks from cask decontamination room 31 to cask maintenance/inspection area 7
And the empty cask storage room 4 is being transferred to the transfer cart.

Next, the operation of this embodiment will be explained.

The used area Fl-loaded cask sent from outside is transferred to the cask maintenance/inspection area 7 by the cask transfer crane 30. The casks inspected in this cask maintenance/inspection area 7 are transported to the transfer trolley of the spent fuel loading cask storage room 3, the dry fuel removal preparation room and cask return preparation room 19, the wet fuel removal pool 16, or the cask temporary stirrup. 32 using the cask transfer crane 30.

In addition, casks that have been removed from the air are transferred from the dry fuel removal preparation room and cask return preparation room 19 and the wet fuel removal pool 16 to the cask temporary storage area 32 or the cask decontamination room 31 using the cask transfer crane 30. .

Furthermore, the empty cask that has been decontaminated in the cask decontamination room 31 is transferred to the cask maintenance/inspection area 7 by the cask transfer crane 30. The empty cask 7 inspected in the cask maintenance/inspection area 7 is then transferred by the cask transfer pin 30 to a transfer trolley in the empty cask storage room 4, where it is temporarily stored or transported to a trolley for loading and unloading from outside. It is transported to a truck and taken outside.

32...Cask temporary storage area, 33...Fuel inspection and maintenance room.

〔Effect of the invention〕

As explained above, the present invention uses a shared cask transfer crane to lift, suspend and transfer casks in the cask storage facility and spent fuel handling facility, thereby improving the operating rate of the crane. At the same time, it is possible to reduce the number of cranes and reduce the construction cost of the facility.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a spent fuel receiving and storage facility showing an embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a plan view showing a conventional example.

Claims (1)

[Claims] 1. Spent fuel having cask storage equipment for storing and maintaining casks loaded with spent fuel and empty casks after fuel removal, and wet fuel handling equipment and dry fuel handling equipment. A spent fuel receiving and storage facility equipped with a spent fuel handling facility, wherein an integrated and common cask transfer crane is provided between the cask storage facility and the spent fuel handling facility. Receiving storage facility. 2. The spent fuel receiving facility according to claim 1, wherein the cask transfer crane is shared by wet fuel handling equipment and dry fuel handling equipment.