Ar ôl mabwysiadu polisi o blaid gwaredu gwastraff ymbelydrol yn ddaearegol, ymunodd Llywodraeth Cymru â rhaglen a ariennir gan Lywodraeth y DU i chwilio am un cyfleuster gwaredu daearegol (CGD) ar gyfer GUA Cymru, Lloegr a Gogledd Iwerddon. Cynhelir y rhaglen gan Radioactive Waste Management Ltd (RWM), is-gwmni sy'n perthyn i'r Awdurdod Datgomisiynu Niwclear.
Following the adoption of geological disposal the Welsh Government joined a programme, funded by the UK Government, to seek a single geological disposal facility (GDF) for the HAW from Wales, England and Northern Ireland.  The programme will be delivered by Radioactive Waste Management Ltd (RWM), a subsidiary of the Nuclear Decommissioning Authority.