JPS62185199A - Air- and water-tight partition device in carry-out-in facility of casks for exchanging fuel for marine 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 [Industrial Application Field 1] The present invention is a flexible vessel for IC that maintains air and water tightness when carrying casks for refueling into and out of a containment vessel housing a marine nuclear reactor. What is the key to a marine nuclear reactor that uses -? Air and watertight partitions in the transport equipment for skates! Regarding equipment.

[Prior Art] Conventionally, fuel exchange equipment for nuclear-powered ships has been proposed as shown in FIGS. 4 and 5. This refueling equipment consists of a shipboard work building d that is temporarily constructed on the deck C of a nuclear power vessel in a dry dock a, an electric door e that opens and closes the side wall opening of the shipboard work building d in an air-watertight manner, and a shipboard work building d. It mainly consists of an overhead crane 9 for transporting casks inside, a sliding hatch cover i for air-tightly opening and closing the top opening of the reactor room, and a land crane j installed on the dockside.

Note that the arm is the containment vessel, and 2 is the reactor vessel.

To explain the procedure for transporting casks f into the containment vessel, first listen to the door e of the shipboard work building d, then use the land crane j to transport the main 11 casks [f] into the shipboard work building d. Casks f are temporarily placed on deck C. Next, close the power line f71tfa O and move to the onboard work building d.
After air-water-tightly closing space 1-1 between the side walls of and lowered it above the reactor volume i!9β.

The procedure for carrying out the casks f is the reverse of the above-mentioned carrying-in procedure.

In this fuel exchange facility, either the electric Ijia or the sliding hatch cover 1 is closed during any process of loading and unloading the fuel tanks f, as described above, so that the irradiated fuel, etc. It is possible to continuously maintain an airtight partition between the

[Problems to be Solved by the Invention] However, the above fuel exchange equipment has the following problems.

(1) In this refueling facility, in addition to the land crane J, a large overhead crane A is required in the shipboard work building (1) as a means of transporting the casks F.

Furthermore, along with this, the scale of the shipboard work building d and the electric door e, which require airtightness, will increase. In addition, in a system that requires such large-scale onboard equipment, it takes time to temporarily install and remove the equipment, and it is also economically disadvantageous and impractical.

[2] When the hatch cover 1 at the top of the reactor room is opened, air containing radioactive materials flows from the reactor room into the shipboard work building (i), so a large amount of radioactive materials leak into the environment. As a result, the inside of the ship's work building becomes an unfavorable environment for the workers involved in the work.

[Objective of the Invention 1 The present invention was devised to effectively solve the problems of the prior art described above, and an object of the present invention is to significantly reduce and simplify the loading and unloading equipment for casks in marine nuclear reactors. 4 for transporting and unloading casks for refueling of marine nuclear reactors, which can reduce the outflow of air containing radioactive materials into the environment.
An object of the present invention is to provide an air-water-tight partition device.

[Summary of the Invention] In order to achieve the above object, the present invention provides a sliding type hatch cover having air and water tightness that opens and closes one opening at the top of the reactor chamber, and a large diameter around the opening of the sliding type hatch cover. The bellows is provided with a flexible bellows in the form of a coin head and a bellows, the end of which is attached in an air and watertight manner, and the small diameter end of which is attached to the cask in an air and watertight manner and is reversible.

The reactor room is air- and water-tightly partitioned by at least one of a sliding hatch cover and a flexible bellows during the entire period of loading and unloading of casks.

[Examples] Examples of the present invention will be described in detail below with reference to the accompanying drawings. In this embodiment, a fuel exchange kirsk will be described as a type of cask.

Fig. 1 shows the loading and unloading equipment for casks equipped with the air-water tight partitioning device of the present invention. Crane 3 is being pushed to KQ. Although not shown, a fuel handling building is built on land, and a loading/unloading trolley 5 is used to transport the fuel exchange cask 4 between the fuel handling building and the dry dock 1.

Inside the nuclear reactor '9.6 of nuclear ship 2, there are
As shown in the figure, a containment vessel 7 is provided, and a reactor vessel 8 is accommodated within the containment vessel 7.

Nuclear fuel 9 is installed in the core of the reactor vessel 8, and a rotating shielding stand 10 is installed at the top of the reactor vessel 8. Further, a sliding hatch cover 12 is attached to the hatch coaming 11 at the top of the reactor chamber 6 in an air-tight manner. The sliding hatch cover 12 has a sliding hatch M13 that opens and closes the hatch opening. ! 1
3 is connected to an IAI operating system (not shown). Air and water tightness of the sliding hatch cover 13 is maintained by an annular inflation seal 14 provided on the inner peripheral wall surrounding the opening of the sliding hatch cover 12.

Around the hatch opening on the sliding hatch cover 12, there is a flange 15 at the large diameter end 7 of a truncated conical flexible bellows 15.
a is installed in an air-tight manner.

Furthermore, the small diameter end flange 15 of the flexible bellows 15
b is adapted to be detachably attached to an annular disk 4a extending from the outer circumferential wall surface of the fuel exchange kit 4 in an air-watertight manner.

Further, since the flexible bellows 15 has a truncated conical shape and is flexible, it can be reversed by moving its small diameter end in the axial direction. In addition, a flexible bellows 15 is provided on the sliding hatch cover 12.
A support tube 16 is provided upright to support the. A suspension-type holding arm 17 is provided on the support tube 16 .

The holding arm 17 supports the small-diameter end of the flexible bellows 15 and supports the disk 4a of the fuel exchange cask 4.
Even if the fuel exchange cask 4 moves up and down while attaching and detaching the small diameter end flange 15b, the entire load of the fuel exchange cask 4 is prevented from being transmitted to the sliding hatch cover 12.

Next, the work of carrying the fuel exchange cask 4 into the containment vessel 7 will be explained.

The loaded refueling cask 4 on the loading/unloading trolley 5 on the dock side is moved to the nuclear ship 2 side I\ by the land crane 3.
It is conveyed and carried above the hatch opening which is partitioned in an air-watertight manner by a sliding hatch lid 13. Next, as shown in FIG.
The small diameter end 7 flange 15b is connected to the disk 4a of the ask 4 in an air-water tight manner. After coupling, the sliding hatch lid 13 of the sliding hatch cover 12 is released, and the refueling kill space 4 is lowered onto the rotating shielding platform 10 installed at the top of the reactor vessel 8 by the land crane 3 (FIG. 3). Flexible bellows 15 has several conical heads and has luxibilities, so it is easy to replace fuel! In the middle of lowering the screen 4 onto the rotating shielding table 10, a reversal occurred. Since the flexible bellows 15 has freight stability, the fuel exchange cask 4 can be suspended at a position eccentric from the center of the rotating shielding table 10. Moreover, the refueling cask 4 is carried out in the reverse order to the above-mentioned carrying-in procedure.

In this way, during any process of loading and unloading the refueling cask 4, the JζζRitturo is touched by either the flexible bellows 15 or the sliding hatch cover 12, so that the air-watertight partition of the reactor room 6 can be maintained continuously. can. In addition, by adopting the flexible bellows 15, compared to the air-water tight partitions of conventional shipboard work buildings,
Significant downsizing and
It can be simplified. Furthermore, the outflow of air containing radioactive materials to the outside of the reactor room 6 can be significantly reduced.

In the above embodiment, the large diameter end 7 flange 15a of the flexible bellows 15 is attached to the sliding hatch cover 12, and the small diameter end 7 flange 15b is detachably attached to the fuel exchange cask 4. The end 7 flange 15b may be attached to the fuel exchange cask 4, and the large diameter end flanone 15a may be detachably attached to the sliding hatch cover 12. Also,
The kitosks are not limited to the fuel exchange kiosk 4, but may also be reactor internal structure casks such as core tank casks.

[Effects of the Invention 1 In summary, the present invention exhibits the following excellent effects.

(1) Flexible bellows are used as air-tight partitions, making it possible to replace conventional large-scale air-tight shipboard work buildings with
It can be a small-scale, simple-structured, weather-tight shipboard work building.

(2) Casks can be carried in and out using only the land-hiflane, eliminating the need for a large overhead crane in the shipboard work building.

(3) Since the shipboard work building can be made small and simple, and overhead cranes, etc., can be made unnecessary, the temporary installation and removal work of shipboard equipment can be easily carried out, and the period for temporary installation and removal can be greatly shortened. It can be shortened to

(4) No overhead crane is required, and casks can be transported using only a land crane, eliminating the need for rehanging casks with large shapes.

(5) Air containing radioactive materials can be prevented from flowing out of the reactor room as much as possible.

Old) Since the shipboard work building and the reactor room are always separated air-tightly, the shipboard work building provides an advantageous environment for workers.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing an example of a loading/unloading facility that leaks the air/water tight partition device according to the present invention, Figures 2 and 3 are diagrams for explaining loading/unloading operations using the same equipment, and Figure 4 5 is an overall configuration diagram showing a conventional loading/unloading facility, and FIG. 5 is a plan sectional view of the same facility. In the figure, 1 is a dry dock, 2 is a nuclear ship, 3 is a land crane, 4 is a fuel exchange kiosk, 6 is a reactor room, 7 is a containment vessel, 8 is a reactor vessel, 12 is a sliding hatch cover,
13 is a slide hatch lid, 14 is an inflated seal,
15 is a flexible bellows, 158 is a large diameter end flange, 15b is a small diameter end flange, 16 is a support cylinder, and 17 is a holding arm. Patent Applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Representative Patent Attorney: Nobuo Kinutani Figure 2 Figure 4

Claims (1)

[Claims] A sliding hatch cover with air and water tightness that opens and closes the opening at the top of the reactor chamber, and a large diameter end of the sliding hatch cover that is airtight and airtightly attached around the opening, and a small diameter end that is airtight and airtightly attached to the casks. 1. An air-watertight partitioning device for carrying in/out equipment for refueling casks of a marine nuclear reactor, characterized in that it is equipped with a truncated conical flexible bellows formed to be able to be rotated and reversed.