New Zealand has had an anti-nuclear stance for the past 25 years and is passionately anti-nuclear.
In 2001 Mr Key bought about 1 million shares worth $NZ200,000 in a small Australian gold exploration business called Jackson Minerals.
Last year it merged with a uranium mining company called Scimitar Resources to form Cauldron Energy, which has a number of uranium exploration projects.
Mr Key admits he should have got rid of the shares.
“It’s a small technical issue. I’ve been busy running the country,” he said.
“I’m the first to admit it was a bit sloppy.”
Mr Key says the shares are now worth very little and when he offered them to his 12-year-old son, even his son did not want them.
Mr Key now plans to sell them.