World Nuclear Energy Day is upon us

December 2, 2025, 12:05PMANS Nuclear Cafe

The sixth annual World Nuclear Energy Day is being celebrated today following its inception in 2020. In recognition, here is a throwback to an Atomic Energy Commission cartoon from the early days of nuclear power:


History: December 2 marks two significant turning points in the advancement of nuclear energy:

  • December 2, 1942: The world’s first self-sustaining, controlled nuclear chain reaction was achieved with Chicago Pile-1 at the University of Chicago.
  • December 2, 1957: The nation’s first commercial nuclear plant, Shippingport Atomic Power Station in Pennsylvania, reached criticality.

Today, nuclear advocates, associations, and companies around the world have adopted December 2 as a day to celebrate the positive impact of nuclear. See what nuclear groups are doing this year on LinkedIn.

The focus of this year’s WNED is “Energizing the Future,” highlighting the current global excitement around near-term development plans across the sector. Last year’s theme was “We Are a Critical Mass.” Previous themes included “Power to the People” in 2023, “A Chain Reaction” in 2022, and “Nuclear in the Neighborhood” in 2021. The theme of the inaugural event in 2020 honored the commitment of people in the nuclear sector during the COVID-19 pandemic.

From Rwanda to Spain to the U.S. and beyond, today marks a day to reflect on the progress we’ve made so far and the progress we’re striving for tomorrow. Read more on WNED’s website about how the international community is celebrating today.


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