Thermal Analysis of Reusable Shielded Transport Containers for ILW

UK Nirex Ltd is developing a deep repository for the disposal of intermediate level and some low level radioactive wastes (IL W and LL W). Nirex is also responsible for producing standard designs of containers for the transport of waste to the repository. One concept under consideration is the Concept L reusable shielded transport container (RSTC) which is being designed to IAEA Type B requirements (IAEA 1990). The contents of an RSTC will normally be cemented IL W in either four 500-litre drums, or a 3m3 box or drum of similar outside dimensions to the four 500-litre drums in their transport frame. The RSTCs will be produced in a range of shielding thicknesses from 70mm to 285mm, to suit the requirements ofthe different waste streams. Figure I shows the 70mm version (RSTC-70) and Figure 2 shows the 285mm version (RSTC-285).