Design No: 4019/4061
Cavity: 3.1m3 (nominal) with 150mm iron shielding

Contents: Solids, ILW
Categories: , .

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Package Type

Designed as a self shielded storage, transport and disposal container for IP quantities of intermediate level waste (ILW).


Currently certified as a Type IP-2 Transport Package.

The container design has been awarded a Conceptual stage Letter of Compliance (cLoC) by Radioactive Waste Management Ltd (RWM).


The MINIBOX is designed as a robust shielded waste storage, transport and disposal package of Intermediate Level Waste (ILW).  Manufactured from ductile cast iron (DCI), the container structure provides both shielding and enhanced package performance with minimum reliance contribution from the wasteform.

The MINIBOX is designed to be compatible with the RWM Waste Package Specification WPS/381/01 for the 3 cubic metre robust shielded box waste package.  It is designed to accommodate ILW that is intended for disposal within a geological disposal facility (GDF) without the need for any further packaging or treatment.  It is also designed to meet RWM disposability requirements after an extended period of on-site storage. A process port is provided for any post-packaging conditioning of contents (optionally further ports can be provided if required).

The MINIBOX is supplied as standard with a shield thickness of 150 mm; internal volume and empty weights are given for this shielding thickness.  Other shield wall thicknesses can be supplied to allow shielding to be optimised against cavity volume and mass for different activity contents.

The MINIBOX can be supplied with either a round lid (MINIBOX-R 150) or rectangular lid (MINIBOX-S 150) as illustrated above.

Illustration of Package MINIBOX-S 150

Illustration of Package MINIBOX-S 150


  • Closure via a double lid system
  • Inner ductile cast iron shield lid with bolted closure provides the same shielding as the container body
  • Steel outer transport lid with verifiable seals and bolted closure
  • Filtered vent in both lids to allow gas release but prevent particulate escape
  • A process port is provided on the inner shield lid

Approved Contents

As a non-fissile IP-2 transport package the MINIBOX is designed to carry solid radioactive materials that qualify as either Low Specific Activity (LSA) or Surface Contaminated Objects (SCO).

Modes of Transport

By road or rail.

 Physical Data 


Design No 4019


Design No 4061

Shield Wall Thickness (mm) 150
External Dimensions (L x W x H) (mm) 2,000 x 1,600 x 1,700
Internal Dimensions (L x W x H) (mm) 1684 x 1284 x 1230
Internal Volume (m3) 3.1
Weight Empty (tonne) 19
Aperture Type Circular Rectangular
Aperture Size (mm) Ø1000 1460 x 1060

Other wall thicknesses are available

All dimensions and weights are nominal values