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
Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
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.
A. Lauer, W. Fröhling
Nuclear Science and Engineering | Volume 57 | Number 1 | May 1975 | Pages 28-38
Technical Paper | doi.org/10.13182/NSE75-A40340
Articles are hosted by Taylor and Francis Online.
Extending the previously presented steady-state characteristics of the pebble-bed high-temperature reactor with the new “once through then out” (OTTO) fuel concept, we have investigated its load-following properties, i.e., the slow core transients in connection with adjustments of the reactor output to meet the power demand. We consider neutronic and thermodynamic characteristics of this strongly asymmetric core design during the related xenon transients where further novel features of this reactor type emerge. Our two-dimensional analysis considers the extremely space-dependent core conditions of a medium sized OTTO pebble-bed reactor during the transient, where the inhomogeneous xenon redistribution and a rod control acting only in the top reflector compete with each other to influence the axial power-density profile. The resulting variations in the maximum fuel temperatures are remarkably small, which reemphasizes the favorable thermodynamic properties of this new reactor concept.