Prime Minister Narendra Modi on Monday (April 6, 2026) said India has taken a defining step in its civil nuclear journey as the indigenously built Prototype Fast Breeder Reactor at Kalpakkam attained criticality.

In a post on X, Mr. Modi said this is a proud moment for the country.

"Today, India takes a defining step in its civil nuclear journey, advancing the second stage of its nuclear programme," he said.

Today, India takes a defining step in its civil nuclear journey, advancing the second stage of its nuclear programme.

The indigenously designed and built Prototype Fast Breeder Reactor at Kalpakkam has attained criticality.