[1][2] The reactor used highly enriched uranium metal fuel clad in aluminium.
The fuel elements were situated within six open-topped aluminium tanks containing water that were separated and surrounded by graphite.
Due to the small size of the core and low burn up of the fuel, the disposal of fission product heating was not an issue.
A study was undertaken (around 1980) to investigate increasing the power to 1 MW thermal; however, this was deemed to be too difficult and the plans were abandoned.
The nuclear waste produced during the dismantling operations was moved to Sellafield for permanent storage.