Internal container of packing set for plutonium dioxide storage and transport

FIELD: safety facilities for handling radioactive materials.

SUBSTANCE: proposed internal container designed for long-time storage and transport of high-radioactivity materials such as plutonium dioxide has container body closed with sealed cover and specified-volume charging box placed in this body and provided with its respective cover. Container body has cylindrical passage for charging box that mounts additional internal cover provided with gas filtering device and hermetically installed relative to its surface for axial displacement. External cover of container body is provided with shut-off valve accommodating gas filtering device installed therein between inner space of container and valve seat. Such mechanical design of container enables reducing irreparable loss of plutonium during its long-time storage and transport.

EFFECT: enhanced safety and reliability , enlarged functional capabilities of container.

7 cl, 2 dwg

 

The invention relates to the field of protective equipment when working with radioactive substances, in particular to devices for long-term storage and transportation of high level radioactive materials, including plutonium dioxide. When handling plutonium dioxide importantly - ensuring nuclear safety, under the strict limitations of a compact mass (or, equivalently, the volume) of plutonium dioxide.

When storing plutonium dioxide occurs:

heat is generated by radioactive decay,

- the release of gases as a result of radioactive decay,

- allocation of radiolysis products (mainly decomposition products adsorbed on the surface of the powder of plutonium dioxide water).

This material is extremely toxic, reactive and prone to the formation of aerosols, so work with him are in sealed boxes filled with dry inert gas. The introduction and removal of plutonium dioxide in the boxes by using sealed containers through the appropriate gateways. Before taking it out of the case the container should be decontaminated.

In the technique used for this purpose shipping packages, securing the contents, nuclear and radiation safety, as well as protecting from the harmful effects of the radio is active substances on the environment and staff.

Known packaging for U.S. patent No. 3531644 that contains the external case with removable zavorajivajushaja cover, the inner container enclosed in the outer cover, lockable removable protective cover, a glass for a radioactive substance placed in the specified inner container and having a resealable open part.

This packaging is designed for storage and transport of radioactive pharmaceuticals and are not intended to increase the internal pressure and temperature during storage, which prevents its use for long-term storage and transportation of plutonium dioxide. In addition, the packaging is not enough reliable from the point of view of integrity. When opening the package of possible radioactive release powder particles of plutonium dioxide.

Most of the above requirements could satisfy modern packaging for storage and transport of plutonium dioxide, consisting of an outer container, the protective layer from the intermediate container and the inner container. The inner container must ensure that the first stage sealing of plutonium dioxide, preventing unauthorized penetration of radioactive substances into the environment, and to ensure the safe execution of RAB is t for the loading and unloading of plutonium dioxide in workplaces with unconditional assurance of nuclear safety.

A prototype of the proposed invention is selected inner container packaging BNFL 1680 plant THORP, UK, described in the book "the Treatment of selected plutonium, technical solutions", nuclear energy Agency. The organization for economic cooperation and development, Moscow, 1998, page 17. The inner container of the THORP plant consists of a boot glass of plutonium dioxide with a capacity of 3 liters, equipped with a screw lid, placed in closely adjacent the intermediate container, the end of which is sealed by a plug by welding. The intermediate container, in turn, placed in an outer container that has a lid sealed by welding.

The main disadvantage of the prototype is the inability of the preliminary discharge a potential of the internal pressure prior to opening the container to extract the plutonium dioxide in repairs or control of the processes occurring during long-term storage. Preliminary gradual pressure relief is required, as when a sudden pressure relief possible the capture and release of radioactive particles, which leads to contamination of the surrounding space and ventilation systems, and can also lead to irreversible losses of plutonium dioxide. This device is difficult to control the tightness of the container Assembly and the process of change at which ospery container.

Also the disadvantage of the prototype is tight glass container for radioactive substances to the intermediate container, which does not allow to reduce the internal pressure in the container due to the free internal volume. In addition, after opening of the inner container of the packaging for routine maintenance or inspections reuse of its body is problematic.

The problem to which this invention is directed, is the creation of the internal container packaging for long term storage and transportation of plutonium dioxide with enhanced safety and reliability considering expanding its functionality and reduce the deadweight losses of plutonium dioxide due to the exclusion of the release of radioactive particles.

To solve the problem of the inner container of the packaging for storage and transport of plutonium dioxide consists of a body of the container is sealed relative to the external lid of the container and placed inside it with boot lid Cup normalized volume, and in the body of the container is cylindrical hole, into which is sealed relative to its surface and with the possibility of axial movement set the Lena inner lid of the container, fitted with devices for gas filtration, and the outer cover of the container is provided with a shut-off valve installed inside between the inner cavity of the container and the valve seat device for filtering the gas.

Private options:

- the volume of the internal cavity of the container selected in the 1.5 to 2.5 times the amount of startup Cup;

- in devices for gas filtration in the filtering material, the cermet or metalloplastic Bicycle;

- external container cover is made with an annular flange which rests on the inner cover of the container and thus provides an axial fixing of the relative position of the inner cover and boot glass of the lid relative to the body of the container;

- inner lid of the container is made with an annular tooth ring and bore on one side and a cylindrical recess equal to the outer diameter of the boot lid of the glass, on the other, and the bottom of the housing container has a cylindrical protrusion, the inner diameter of the undercut which is equal to the outside diameter of the boot glass;

in the case of sealing by welding the outer cover and the housing interior of the container, the flange of the body of the container is made of a thickness equal to the thickness of the edge of the lid of the container, and the diameter of the flange and the cover in place welding is ibrani less than the diameter of the container, moreover, the width of the flange 6-8 times larger than the total thickness of the flange and the edge of the lid of the container.

The use of the present invention will improve the safety and reliability of the containers due to:

- gas output from the boot of glass in the internal volume of the container that will reduce the potential increase in pressure;

controlled pressure relief before opening the container;

almost complete elimination of the deadweight losses of plutonium dioxide by reducing emissions of aerosols.

The proposed design of the inner container extends its technological capabilities for operations control the tightness, the change of the atmosphere and the pressure in the container, as well as the analysis of gas release during long-term storage.

The use of hermetically sealed relative to the housing container inner cover and its geometry attached to the inner container, a new quality, which consists in improving its reliability and security by creating additional step of sealing that reduces contamination of the outer surface of the body of the container when the operations of loading and unloading of the container.

Figure 1 shows the non-separable version of the internal container, in which the sealing body of the container with its lid carry out welding.

Figure 2 shows the folding is Ariant inner container.

The inner container of the packaging figure 1 consists of a body of the container 1, the closed outer cover 2, provided with a shut-off valve 3 with the installed device to filter gas filter 4. In the housing bore of the container placed inside cover 5, is equipped with two devices for gas filtration with filters 6, the annular tooth 7, intended for sealing interior cover with lid airlock hatch (figure 1 and 2 is not shown), which fit in the container. The inner lid has a circular bore 8, is necessary to capture the inner cover mechanism for its removal and installation. Boot glass 9 normalized volume with lid 10 is placed coaxially inside the container, centerwas regarding him with a cylindrical protrusion on the bottom of the container shell 11 and a cylindrical undercut 12 on the inner cover.

Figure 2 shows how the external container cover 13 is fixed to the body of the container by bolts 14. Sealing the cover to the body of the container is provided with a gasket 15.

The proposed inner container can be used in transport and packaging on the basis of protecting the container at-400, currently used in various types of packaging for storage and transport of metallic plutonium and uranium.

1. Internal is ontainer packaging for storage and transport of plutonium dioxide, consisting of a body of the container is sealed relative to the external lid of the container and placed inside it with boot lid Cup normalized volume, characterized in that the body of the container is cylindrical hole for the passage of the boot of the glass, which is sealed relative to the cylindrical surface of the hole and with the possibility of axial movement installed inside cover of the container, equipped with devices for gas filtration, and the outer cover of the container is equipped with a shut-off valve between the seat which the internal cavity of the container is placed a device for filtering gas.

2. The inner container of the packaging for storage and transport of plutonium dioxide according to claim 1, characterized in that the volume of the internal cavity of the container is 1.5-2.5 times more volume boot glass.

3. The inner container of the packaging for storage and transport of plutonium dioxide according to claim 1, characterized in that the device for filtering gas filtering material, the cermet or metalloplastic car.

4. The inner container of the packaging for storage and transport of plutonium dioxide according to claim 1, characterized in that the outer cover of the container is made with the ring you blunt, resting in the inner cover of the container and providing an axial fixing of the relative position of the inner cover and boot glass of the lid relative to the body of the container.

5. The inner container of the packaging for storage and transport of plutonium dioxide according to claim 1, characterized in that the inner container cover is made with an annular tooth ring and bore on one side and a cylindrical recess equal to the outer diameter of the boot lid of the glass, on the other, and the bottom of the housing container has a cylindrical protrusion, the inner diameter of the undercut which is equal to the outside diameter of the boot glass.

6. The inner container of the packaging for storage and transport of plutonium dioxide according to claim 1, characterized in that the body of the container is made with a flange, the thickness of the flange is equal to the thickness of the outer edge of the lid of the container, and the diameter flanging flange and cover selected less than the diameter of the container, and the width of the flanging 6-8 times its thickness.

7. The inner container of the packaging for storage and transport of plutonium dioxide according to claim 1, characterized in that the outer cover attached to the body of the container by bolts and between the lid and the body of the container is placed padding.



 

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FIELD: safety facilities for handling radioactive materials.

SUBSTANCE: proposed internal container designed for long-time storage and transport of high-radioactivity materials such as plutonium dioxide has container body closed with sealed cover and specified-volume charging box placed in this body and provided with its respective cover. Container body has cylindrical passage for charging box that mounts additional internal cover provided with gas filtering device and hermetically installed relative to its surface for axial displacement. External cover of container body is provided with shut-off valve accommodating gas filtering device installed therein between inner space of container and valve seat. Such mechanical design of container enables reducing irreparable loss of plutonium during its long-time storage and transport.

EFFECT: enhanced safety and reliability , enlarged functional capabilities of container.

7 cl, 2 dwg

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EFFECT: enhanced safety and reliability , enlarged functional capabilities of container.

7 cl, 2 dwg

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