The clock is 'officially' ticking on a plan to bury nuclear waste near the shore of Lake Huron.

A federal review panel has closed the comment period on discussions into Ontario Power Generation's plan to bury the waste 680 metres underground at the Bruce Power site.

The proposed location has drawn criticism because it's within 1.2 kilometres of Lake Huron, the source of drinking water for 40 million people.

The three-member review panel will make a recommendation to the federal environment minister on whether to proceed with the project no later than May 6, 2015.

The panel initially had 90 days to make a decision, but asked for an extension because of the complexity and importance of the project.