Tracking the future of nuclear energy.
Civil Nuclear

In December 1938, Otto Hahn and Fritz Strassmann found barium in a uranium sample and wrote a bewildered letter to Lise Meitner, who worked out the physics on a snowy walk in Sweden and gave the process a name borrowed from biology: fission

In December 1938, Otto Hahn and Fritz Strassmann found barium in a neutron-bombarded uranium sample and couldn't explain it. Lise Meitner and her nephew Otto Frisch worked out the physics on a snowy walk in Sweden — and borrowed a word from cell biology to name what they'd found.

Latest

All articles →
Civil Nuclear

In 1977, engineers at the Shippingport reactor in Pennsylvania started up a thorium-fuelled core that produced slightly more fissile uranium-233 than it consumed over five years of operation, quietly proving that a light-water reactor could breed its own fuel without a single sodium-cooled fast reactor in sight

In 1977, a modified core slid into the Shippingport Atomic Power Station on the Ohio River in Pennsylvania and quietly began doing something that most nuclear engineers of the era assumed only a sodium-cooled fast reactor could pull off.

Civil Nuclear

In 1961, a routine restart at the SL-1 reactor in Idaho ended when an operator withdrew the central control rod about 20 inches by hand, triggering a steam explosion that lifted the entire 26,000-pound vessel off the floor in about four milliseconds and killed all three men on duty

On January 3, 1961, three young servicemen restarting a small Army reactor in the Idaho desert died in about four milliseconds when a single control rod came up 20 inches instead of four. SL-1 remains the only fatal reactor accident in U.S. history — and no one has ever fully explained why the rod moved that far.

Civil Nuclear

A single uranium-235 nucleus splitting releases about 200 million electron volts, roughly 50 million times the energy of burning one carbon atom, which is why a fuel assembly the size of a car can power a city for eighteen months

A single uranium-235 fission releases about 200 million electron volts — roughly 50 million times what burning one carbon atom yields. That ratio is why a car-sized fuel assembly can power a city for 18 months.

What’s up in

Civil Nuclear

Civil nuclear energy, reactor technology, regulation, safety, fuel cycles, and the policies, projects, and research shaping the future of nuclear power.

About Nuclear Power Daily

Tracking the future of nuclear energy.

Nuclear Power Daily is an independent publication covering civil nuclear energy, reactor technology, regulation, safety, fuel cycles, and the policies and projects shaping nuclear power. The site pairs a deep archive with current reporting on the research, companies, policy shifts, safety debates, and technical breakthroughs shaping the future of nuclear energy. We employ modern AI technologies to support our editorial workflows; every published piece is editorially directed and reviewed.

More about us →