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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
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.
Frederick G. Hammitt, Evan C. Kovacic, Frederick J. Leitz
Nuclear Science and Engineering | Volume 7 | Number 4 | April 1960 | Pages 327-335
Technical Paper | doi.org/10.13182/NSE60-A25726
Articles are hosted by Taylor and Francis Online.
The problems that might result from the release of fission gases in mobile fuel fast reactors are considered for two types of mobile fuel systems; namely, a molten alloy fuel system of the type to be used in the Los Alamos Molten Plutonium Reactor Experiment and a paste fuel system of the type being developed by the Atomic Power Development Associates, Inc. It is shown that the volume of fission gases generated in fast reactors operating at high-power density would supersaturate such fuel systems in minutes or less. An examination of the physical conditions in the reactor core and an evaluation of the phenomena responsible for bubble formation result in the conclusions that neither fuel system will sustain a significant degree of supersaturation and that bubble formation will most likely occur at a solid-liquid interface rather than in the bulk of the liquid. The effects of bubble formation in each system are considered, and these are seen to involve partial blanketing of the heat transfer surfaces, overheating of the fuel—particularly of the paste fuel, equilibrium dilution of the fuel with significant loss in reactivity, sudden displacement of the fuel with subsequent rapid changes in reactivity, and blocking of narrow fuel ligaments and orifices. Preliminary experiments, using supersaturated solutions of carbon dioxide in water and in water-glass bead beds are reported, which verify some of the analyses which are made regarding the location of bubble formation and the growth of bubbles. The flow characteristics of pastes in tubes and the behavior of gas bubbles in such flow systems are discussed in the light of experiments which were conducted using a simulant system of air/glass beads/water.