So on the basis of the above figures the amount of ILW contained in the big canister that Rowan mentioned is actually only 0.1 per cent by volume of the ILW intended for Napandee. (In other words the documented volume of ILW intended for Napandee is about 1000 times more than what he stated).
Andrew Williams, Fight to stop sa nuclear waste dump in South Australia, 1 Dec 21, Rowan Ramsey stated that the TN-81 canister in the Interim Waste Store at Lucas Heights is the only Intermediate Level Waste intended for Napandee. This is not correct.
The large canister that he mentioned contains reprocessed used nuclear fuel from the old decommissioned HIFAR reactor, which ARPANSA notes as having radioactivity at the higher end of the ILW range.
That means it must remain safe from people and the environment for 10,000 years according to International guidelines followed by the Australian regulator. Another load of reprocessed used nuclear fuel from the old HIFAR reactor is due back next year and is intended to end up at Napandee, in the same type of TN-81 container.
Of the waste intended for Napandee, this highly hazardous reprocessed nuclear fuel is the most radioactive. However there is a lot more intermediate level waste (ILW) than what is in these two big containers intended for Napandee. All of the reprocessed highly hazardous used nuclear fuel produced by the existing OPAL reactor over its operating life is intended for Napandee in years to come.
However during the production of radioactive isotopes (some of which are used in nuclear medicine) ILW is produced. The Australian Radioactive Waste Management Framework (2018) reports total ILW at 1770 cubic metres, with 95% by volume as federal gov. wastes. It is intended to produce a further 1,960 cubic metres over the next 40 years (all intended for Napandee), most of which will be produced at Lucas Heights. (This is documented and can be checked).
All of this ILW is intended to go to Napandee for up to 100 years of above ground storage. A TN-81 container can hold up to 28 canisters, each containing 150 litres of vitrified reprocessed fuel waste. 28×150 litres = 4,200 litres = 4.2 cubic metres. So on the basis of the above figures the amount of ILW contained in the big canister that Rowan mentioned is actually only 0.1 per cent by volume of the ILW intended for Napandee. (In other words the documented volume of ILW intended for Napandee is about 1000 times more than what he stated).