Feature Articles

Z, a machine that exceeds the power of all the generating power plants on Earth when it fires, is the guest of honor tomorrow when its former directors come together to celebrate 25 years of the machine's existence. Z produces data that protects the nuclear stockpile, investigates aspects of the stars, and has moved forward humanity's quest for controlled nuclear fusion, a distant dream.

Nuclear power is a significant source of steady carbon-neutral electricity, making the design and construction of new and next-generation nuclear reactors critical for achieving the U.S.’s green energy goals. A number of new nuclear reactor designs, such as small modular reactors and non-light water reactors, have been developed over the past 10 to 15 years. In order to help the Nuclear Regulatory Commission evaluate the safety of the next generation of reactors, fuel cycle facilities and fuel technologies, researchers at Sandia National Laboratories have been expanding their severe accident modeling computer code, called Melcor, to work with different reactor geometries, fuel types and coolant systems.