ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
Meeting Spotlight
2024 ANS Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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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Latest News
New laws offer nuclear industry incentives for existing power plant uprates
This year, the U.S. nuclear industry received a much-needed economic boost that could help preserve operating nuclear power plants and incentivize upgrades that extend their lifespan and power output.
Signed into law in 2022, the Inflation Reduction Act offers production tax credits (PTCs) for existing nuclear power plants and either PTCs or investment tax credits (ITCs) for new carbon-free generation. These credits could make power uprates—increasing the maximum power level at which a commercial plant may operate—a much more appealing option for utilities.
G. Kessler
Nuclear Science and Engineering | Volume 155 | Number 1 | January 2007 | Pages 53-73
Technical Paper | doi.org/10.13182/NSE07-A2644
Articles are hosted by Taylor and Francis Online.
This paper analyzes whether reactor plutonium after denaturing by increasing its isotopic content of 238Pu to 6 to 8% can be regarded as proliferation resistant. In this case the utilization of such denatured reactor plutonium would become unsuitable for a nuclear explosive device (NED) because the high-explosive lenses surrounding the plutonium would melt or their elevated temperature would lead to self-ignition. Eight different plutonium isotopic mixtures with increasing 238Pu content are analyzed, and their critical masses if surrounded by a 5-cm-thick reflector of natural uranium are determined. This allows calculation of the alpha-particle heat power generated in the plutonium sphere by 238Pu and other plutonium isotopes. Then, three levels of technology with regard to the size of such hypothetical NEDs (HNEDs) and the technological level of high explosives are defined. On the basis of material data available in the open scientific literature, the radial temperature profiles in such HNEDs of an assumed configuration are calculated, and it is found that for low-technology HNEDs the limiting temperatures are exceeded for a 238Pu content of 1.6%. For high-technology HNEDs these limiting temperatures are exceeded for a 238Pu content above ~6% or somewhat more. Such denatured plutonium can be considered as proliferation resistant, similarly as uranium with <20% 235U or <12% 233U.