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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.
David C. Wade, Edward K. Fujita
Nuclear Science and Engineering | Volume 103 | Number 2 | October 1989 | Pages 182-195
Technical Paper | doi.org/10.13182/NSE89-6
Articles are hosted by Taylor and Francis Online.
Favorable passive reactivity shutdown performance in response to unprotected accident initiators has been shown to be achievable when several measurable, integral reactivity parameters related to the power, flow, and inlet temperature coefficients of reactivity satisfy certain simple constraints among their dimensionless ratios. The trends in these dimensionless ratios with reactor size for both oxide- and metal-fueled cores have been developed, based on a data base of ∼24 reactor designs in the range from 400 to 3600 MW(thermal). Based on the trends, it is possible to conclude that the favorable passive reactivity shutdown features that accrue to the metallic-fueled reactors in the mod-ular-size range can be achieved as well in the larger commercial sizes.