The Supreme Court has asked the Centre as to what would be the guarantee that no radioactive substance will be present in the spent fuel to be stored at the Kudankulam nuclear power plant in Tamil Nadu.

Posing a host of queries to the centre on the functional safety of the power plant, a bench of justices K S Radhakrishanan and Deepak Misra yesterday also asked if any environmental impact assessment was done on the project.

The bench posted the matter for further hearing on next Thursday, saying that it would pass appropriate orders after examining the issue at length.