WO2018108073A1

WO2018108073A1 - Nuclear power plant spent fuel storage and transportation metal tank

Info

Publication number: WO2018108073A1
Application number: PCT/CN2017/115634
Authority: WO
Inventors: 袁呈煜; 杨锦春; 王鑫; 刘翠波; 莫怀森; 左永德; 杨寿海; 唐琼辉
Original assignee: 深圳中广核工程设计有限公司; 中广核工程有限公司; 中国广核集团有限公司
Priority date: 2016-12-12
Filing date: 2017-12-12
Publication date: 2018-06-21
Also published as: CN106448783A

Abstract

A nuclear power plant spent fuel storage and transportation metal tank comprises a metal tank (1) and a fuel basket (2) detachably accommodated in the metal tank. The metal tank (1) comprises: a housing (10); a base (12) hermetically sealed and fixed at a bottom portion of the housing (10); a top cover (14) hermetically sealed and fixed at a top portion of the housing (10); and a redundant top cover (16) hermetically sealed and fixed on the housing (10). In comparison to the prior art, the nuclear power plant spent fuel storage and transportation metal tank resolves issues of safe storage of spent fuel and post-transportation of the spent fuel, realizing long-term safe storage and transportation of the spent fuel. In addition, since that the fuel basket (2) is detachably accommodated in the metal tank, the fuel basket (2) can be used for loading fuel frames having different structures, providing universality.

Description

Nuclear power plant spent fuel storage and transportation dual function metal can

Technical field

The invention belongs to the field of dry storage and transportation of spent fuel in nuclear power plants, and more particularly to a dual-function metal can of spent fuel storage and transportation in a nuclear power plant.

Background technique

Since the commercial application of nuclear power plants, a large amount of spent fuel has been produced. The safe and effective management of spent fuel has become an important issue in the international nuclear industry. Due to the lack of international spent fuel reprocessing capacity and high cost, the world has not yet built a final repository of spent fuel, and the temporary storage of spent fuel is currently the main international response. At present, many nuclear power plants in the world have adopted intermediate storage methods to transfer spent fuel from spent fuel pools to enable nuclear power plants to continue to operate.

The spent fuel that has just been discharged from the reactor is highly radioactive and calorific, so it is often necessary to cool the spent fuel pool in a nuclear power plant for 5 to 10 years before it is transferred to an intermediate storage facility. The intermediate storage of spent fuel mainly includes wet and dry storage. Among them, dry storage has become the mainstream of the international intermediate fuel storage technology due to its high safety, economy and easy expansion.

At present, the international dry storage technology for spent fuel mainly uses concrete storage systems. The concrete storage system includes a concrete silo and a fuel storage tank, wherein the concrete silo provides shielding radiation and safety protection functions, and the heat inside the fuel storage tank is derived in a passive manner. The main functions of the fuel tank are: providing sealing, containing radioactive materials, providing structural support for spent fuel assemblies, maintaining subcritical conditions of spent fuel assemblies, and shielding radiation. The fuel storage tank is generally a cylindrical metal structure including a cylinder, an upper top cover, a bottom cover and a fuel basket, wherein the fuel basket is not removable. In order to ensure the sealing of the fuel storage tank, the connection between the top cover and the casing is a redundant welded sealing structure.

In existing concrete storage systems, concrete silos are not transportable, so in-plant transport of spent fuel And long-distance transportation requires a dedicated transport container; in addition, the fuel basket is welded in the fuel tank body, and the fuel tank can only be loaded with a fuel frame of a single structure, which is inferior in versatility.

In view of the current need for concrete storage systems to use fuel storage tanks as radioactive containment vessels, and in view of the fact that future spent fuel assemblies need to be transported to post-treatment plants after storage in concrete storage systems for a period of time, it is necessary to design a type that can be used for storage. It can also be used for transportation of nuclear power plants for spent fuel storage and transportation of dual-function metal cans.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and to provide a dual-function metal canister for spent fuel storage and transportation in a nuclear power plant that can be used for both storage and transportation.

In order to achieve the above object, the present invention provides a nuclear power plant spent fuel storage and transportation dual function metal can, comprising a metal can body and a fuel basket housed in the metal can, wherein the metal can body comprises a casing and a sealing solid A base attached to the bottom of the housing, a top cover sealed to the top of the housing, and a redundant top cover secured to the housing.

As an improvement of the spent fuel storage and transportation dual function metal can of the nuclear power plant of the present invention, the fuel basket is detachably housed in a metal can.

As an improvement of the dual-function metal can of spent fuel storage and transportation in the nuclear power plant of the present invention, the casing comprises a cylinder body, a side support fixedly connected to the inner wall of the cylinder body, a lifting lug fixedly connected to the top of the cylinder body, and a fixed connection Drainage pipe support on the inner wall of the cylinder.

As an improvement of the spent fuel storage and transportation bifunctional metal can of the nuclear power plant of the present invention, the side support is fixedly connected to the inner wall of the cylinder for supporting and protecting the fuel basket.

As an improvement of the spent fuel storage and transportation dual function metal can of the nuclear power plant of the present invention, the base comprises a bottom plate and a lower support fixedly connected to the bottom plate.

As an improvement of the dual-function metal can of spent fuel storage and transportation in the nuclear power plant of the present invention, the bottom plate is provided with a water collecting circular groove for discharging water in the metal can.

As an improvement of the dual-function metal can of the spent fuel storage and transportation of the nuclear power plant of the present invention, the top cover comprises a shielding cover, an upper support fixed to the shielding cover, an air inlet module fixed to the shielding cover, and fixed to the air inlet module Drain pipe module for the shield cover.

As an improvement of the dual-function metal can of the spent fuel storage and transportation of the nuclear power plant of the present invention, the shielding cover is provided with an air inlet hole and a drainage hole.

As an improvement of the dual-function metal can of spent fuel storage and transportation in the nuclear power plant of the present invention, the air inlet module comprises an inflatable drainage hole sealing cover, an inflatable drainage quick connector and an inflation hole shielding block, and the lower end of the inflatable drainage quick connector and the shielding cover The gas is passed through the intermediate passage of the pneumatic drain quick joint by means of circumferential welding, and the air inlet sealing cover is arranged at the top of the pneumatic drain quick joint and fixed at the air inlet hole of the shield cover.

As an improvement of the dual-function metal can of spent fuel storage and transportation in the nuclear power plant of the present invention, the drain pipe module comprises an inflatable drainage hole sealing cover, a pneumatic drainage quick joint, a drainage hole shielding block and a drainage pipe, and an inflatable drainage quick joint lower end and a top The cover is fixed by circumferential welding, and the drainage hole shielding block is disposed directly under the inflatable drainage quick connector and fixed at the lower end of the shielding cover. The inflatable drainage hole sealing cover is disposed at the top of the inflatable drainage quick connector and is fixed at the drainage hole on the shielding cover.

As an improvement of the dual-function metal can of spent fuel storage and transportation in the nuclear power plant of the present invention, the redundant top cover is a ring plate structure, and is formed by welding a plurality of curved plates.

As an improvement of the spent fuel storage and transportation dual function metal can of the nuclear power plant of the present invention, the base, the top cover and the redundant bottom cover are sealingly welded to the casing.

Compared with the prior art, the spent fuel storage and transportation dual-function metal can of the nuclear power plant of the present invention can be placed in a concrete or metal shielding container after loading the spent fuel assembly, thereby realizing long-term, safe and reliable storage of the spent fuel assembly; After storage for a period of time, the metal can can be taken out and transferred to the spent fuel transport container to achieve safe transportation of the spent fuel assembly.

In addition, since the fuel basket is detachably housed in the metal can, the fuel grid of different structural forms can be loaded, which has ideal versatility.

DRAWINGS

Hereinafter, the dual-function metal cans for spent fuel storage and transportation of the nuclear power plant of the present invention and the technical effects thereof will be described in detail in conjunction with the accompanying drawings and specific embodiments, wherein:

1 is a schematic structural view of a dual-function metal can of spent fuel storage and transportation in a nuclear power plant of the present invention.

2 is a cross-sectional view showing the dual-function metal can of spent fuel storage and transportation in a nuclear power plant of the present invention.

3 is a partial cross-sectional view of the metal can body of FIG. 2.

Figure 4 is a cross-sectional view of the housing of Figure 3.

Figure 5 is a cross-sectional view of the drain pipe support and the cylinder of Figure 3.

Figure 6 is a schematic view of the base of Figure 3.

Figure 7 is a partial cross-sectional view showing the bottom of the metal can of Figure 3.

Figure 8 is a schematic view of the top cover of Figure 3.

Figure 9 is a partial cross-sectional view showing the region of the intake hole at the top of the metal can of Figure 8.

Figure 10 is a partial cross-sectional view showing the area of the drain pipe at the top of the metal can of Figure 8.

11 is a schematic structural view of the redundant top cover of FIG. 3.

detailed description

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. The specific embodiments described in the specification are to be construed as illustrative only and not limiting.

Referring to FIG. 1 to FIG. 3, the dual-function metal canister for spent fuel storage and transportation of the nuclear power plant of the present invention comprises: a metal can body 1 and a fuel basket 2 housed in the metal can. The metal can body 1 includes a housing 10, a base 12 sealed to the bottom of the housing 10, a top cover 14 sealed to the top of the housing 10, and a redundant top cover 16 sealed to the housing 10. The fuel basket 2 is relatively independent from the metal can body 1 and is detachably mounted in the metal can body 1. Therefore, the fuel grid of different structural forms can be loaded, which has ideal versatility.

Referring to FIGS. 3, 4, and 5, the housing 10 includes a barrel 100, side supports 102, lugs 104, and a drain support 106. The side supports 102 are welded to the barrel 100 for supporting and adjusting the fuel basket 2. The lifting lug 104 is welded to the top of the cylinder 100 for hoisting an empty metal can while supporting the top cover 14. The drain pipe support 106 is welded to the inner wall of the cylinder 100 for supporting the drain pipe 156 on the top cover 14, so that the drain pipe 156 is installed and guided to prevent the drain pipe 156 from swinging.

Referring to FIGS. 3, 6, and 7, the base 12 includes a bottom plate 120 and a lower support 122. The lower support 122 is fixed to the bottom plate 120 by welding (or bolts). Immediately below the drain pipe 156, the bottom plate 120 is provided with a water collecting circular groove 124 for discharging the water in the metal can.

Referring to FIGS. 3 and 8, the top cover 14 includes a shield cover 140, an upper support 142, an air intake module 144, and a drain module 146. The upper support 142 is fixed to the shield cover 140 by welding (or bolts). In order to facilitate the operation of inflating and draining the metal can, the shielding cover 140 is provided with an inflation hole and a drainage hole. The air inlet module 144 is welded and fixed to the inflation hole of the shielding cover 140, and the drain module 146 is welded and fixed to the drainage hole of the shielding cover 140.

Referring to FIGS. 3, 8, and 9, the air intake aperture module 144 includes an inflatable drain seal cover 148, an inflatable drain quick connector 150, and an inflation aperture shield block 152. The lower end of the inflatable drain quick connector 150 and the shield cover 140 are circumferentially welded to ensure that gas can only flow through the intermediate passage of the pneumatic drain quick connector 150. Directly below the inflatable drain quick connector 150, an inflation hole shielding block 152 is fixedly welded to the lower end of the shielding cover 140. On the top of the inflatable drainage quick connector 150, an air inlet sealing cover 148 is disposed and welded to the shielding cover 140. A weld seal is formed with the shield cover 140 and the weld of the barrel 100.

Referring to FIGS. 3, 8, and 10, the drain module 146 includes an inflatable drain seal cover 148, an inflatable drain quick coupler 150, a drain hole shield block 154, and a drain 156. The lower end of the inflatable drain quick connector 150 and the shield cover 140 are circumferentially welded to ensure that the discharged water can only flow through the intermediate passage of the pneumatic drain quick connector 150. A drain hole shielding block 154 is welded and fixed to the lower end of the shielding cover 140 directly under the inflatable drain quick connector 150. An air inlet sealing cover 148 is disposed on the top of the pneumatic drainage quick connector 150, and the air inlet sealing cover 148 is welded to the shielding cover. Plate 140, with shield cover 140 and cylinder 100 The weld seam forms the first seal boundary.

Referring to FIG. 3 and FIG. 11, the redundant top cover 16 is a ring plate structure. For the convenience of processing and manufacturing, the redundant top cover 16 can be welded by using a plurality of curved plates. The redundant top cover 16 and the cylinder 100 are welded and fixed to form a second sealing barrier on the top of the metal can.

In combination with the above detailed description of various embodiments of the present invention, it can be seen that, compared with the prior art, the spent fuel storage and transportation dual-function metal can of the nuclear power plant of the present invention can be placed in a concrete or metal shielding container after loading the spent fuel assembly, thereby realizing Long-term, safe and reliable storage of spent fuel assemblies; after storage in a shielded container for a period of time, the metal cans can be removed and transferred to a spent fuel transport container for transport to a designated location (eg, a reprocessing plant) to achieve a spent fuel assembly Safe transportation.

It can be understood that, in other embodiments of the present invention, the structure of the metal can may also undergo one or more of the following changes: 1) canceling the upper support; 2) canceling the lower support; 3) dividing the shielding cover into several Layer cover; 4) The structural form and number of side supports are provided as needed.

The above embodiments may be modified and modified as appropriate by those skilled in the art in light of the above disclosure. Therefore, the invention is not limited to the specific embodiments disclosed and described herein, and the modifications and variations of the invention are intended to fall within the scope of the appended claims. In addition, although specific terms are used in the specification, these terms are merely for convenience of description and do not limit the invention.

Claims

A dual-function metal canister for spent fuel storage and transportation in a nuclear power plant, comprising a metal can body and a fuel basket housed in the metal can, wherein the metal can body comprises a casing and is sealed and fixed at the bottom of the casing. The base, the top cover sealed to the top of the housing, and the redundant top cover sealed to the housing.
The dual-function metal canister for spent fuel storage and transportation in a nuclear power plant according to claim 1, wherein the fuel basket is detachably housed in a metal can.
The dual-function metal canister for nuclear power plant storage and transportation according to claim 1 or 2, wherein the casing comprises a cylinder body, a side support fixedly connected to the inner wall of the cylinder body, and a crane fixedly connected to the top of the cylinder body. The ear, and the drain pipe fixedly connected to the inner wall of the cylinder.
The dual-function metal canister for nuclear power plant storage and transportation according to claim 3, wherein the side support is fixedly connected to the inner wall of the cylinder for supporting and protecting the fuel basket.
The dual-function metal canister for spent fuel storage and transportation in a nuclear power plant according to claim 1 or 2, wherein the base comprises a bottom plate and a lower support fixedly connected to the bottom plate.
The dual-function metal canister for spent fuel storage and transportation in a nuclear power plant according to claim 5, wherein the bottom plate is provided with a water collecting circular groove for discharging water in the metal can.
The dual-function metal canister for nuclear power plant storage and transportation according to claim 1 or 2, wherein the top cover comprises a shielding cover, an upper support fixed to the shielding cover, and an air inlet fixed to the shielding cover. Hole module, and drain module fixed to the shield cover.
The dual-function metal canister for spent fuel storage and transportation in a nuclear power plant according to claim 7, wherein the shielding cover plate is provided with an air inlet hole and a drainage hole.
The dual-function metal canister for nuclear power plant storage and transportation according to claim 7, wherein the air intake hole module comprises an inflatable drainage hole sealing cover, an inflatable drainage quick connector and an inflation hole shielding block, and a lower end of the inflatable drainage quick connector. The shield cover is circumferentially welded to allow gas to flow from the intermediate passage of the pneumatic drain quick joint. The intake seal cover is disposed on the top of the inflatable drain quick joint and fixed to the shield cover. Above the air intake.
The dual-function metal canister for spent fuel storage and transportation in a nuclear power plant according to claim 7, wherein the drain pipe module comprises an inflatable drainage hole sealing cover, an inflatable drainage quick joint, a drainage hole shielding block and a drainage pipe, and the inflation drainage is fast. The lower end of the joint and the top cover are fixed by circumferential welding, and the drain hole shielding block is disposed directly under the inflatable drain quick joint and fixed at the lower end of the shielding cover, and the inflatable drain hole sealing cover is arranged on the top of the inflatable drain quick joint and fixed on the shielding cover. At the drain hole.
The dual-function metal canister for spent fuel storage and transportation in a nuclear power plant according to claim 1 or 2, wherein the redundant top cover is a ring plate structure, and is formed by welding a plurality of curved plates.
The dual-function metal canister for spent fuel storage and transportation in a nuclear power plant according to claim 1 or 2, wherein the base, the top cover and the redundant bottom cover are hermetically welded to the casing.