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Division Spotlight
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
Meeting Spotlight
Conference on Nuclear Training and Education: A Biennial International Forum (CONTE 2025)
February 3–6, 2025
Amelia Island, FL|Omni Amelia Island Resort
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Reboot: Nuclear needs a success . . . anywhere
The media have gleefully resurrected the language of a past nuclear renaissance. Beyond the hype and PR, many people in the nuclear community are taking a more measured view of conditions that could lead to new construction: data center demand, the proliferation of new reactor designs and start-ups, and the sudden ascendance of nuclear energy as the power source everyone wants—or wants to talk about.
Once built, large nuclear reactors can provide clean power for at least 80 years—outlasting 10 to 20 presidential administrations. Smaller reactors can provide heat and power outputs tailored to an end user’s needs. With all the new attention, are we any closer to getting past persistent supply chain and workforce issues and building these new plants? And what will the election of Donald Trump to a second term as president mean for nuclear?
As usual, there are more questions than answers, and most come down to money. Several developers are engaging with the Nuclear Regulatory Commission or have already applied for a license, certification, or permit. But designs without paying customers won’t get built. So where are the customers, and what will it take for them to commit?
G. Giacchetti, C. Sari
Nuclear Technology | Volume 31 | Number 1 | October 1976 | Pages 62-69
Technical Paper | Fuel | doi.org/10.13182/NT76-A31699
Articles are hosted by Taylor and Francis Online.
Metallic molybdenum, Mo-Ru-Rh-Pd alloys, barium, zirconium, and tungsten have been added to uranium and uranium-plutonium oxides by coprecipitation and mechanical mixture techniques. This material has been treated in a thermal gradient similar to that existing in fuel during irradiation to study the behavior of molybdenum in an oxide matrix as a function of the O/(U+Pu) ratio and some added elements. The result of ceramographic and microprobe analysis shows that when the overall O/(U+Pu) ratio is <2, molybdenum and Mo-Ru-Rh-Pd alloy inclusions are present in the uranium-plutonium oxide matrix. If the O/(U+Pu) ratio is >2, molybdenum oxidizes to MoO2, which is gaseous at a temperature ∼1000°C. Molybdenum oxide vapor reacts with barium oxide and forms a compound that exists as a liquid phase in the columnar grain region. Molybdenum oxide also reacts with tungsten oxide (tungsten is often present as an impurity in the fuel) and forms a compound that contains ∼40 wt% of actinide metals. The apparent solubility of molybdenum in uranium and uranium-plutonium oxides, determined by electron microprobe, was found to be <250 ppm both for hypo- and hyperstoichiometric fuels.
