Answer:
Deep geological disposal method
Step-by-step explanation:
A deep geological disposal method is the most efficient method in disposing of the waste materials produced from a nuclear plant. These materials are disposed at a depth of usually about 200 to 1000 m below the surface and also from 1500 m to 5500 m below the surface. And it has to be below the groundwater level so that it does not contaminate it. So necessary precautionary measures are needed to be taken.
This method is used for the disposal of high and intermediate levels of nuclear waste often represented by HLW and ILW respectively.