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.
Bernard Rottner
Nuclear Science and Engineering | Volume 155 | Number 3 | March 2007 | Pages 463-474
Technical Paper | Mathematics and Computation, Supercomputing, Reactor Physics and Nuclear and Biological Applications | doi.org/10.13182/NSE07-A2677
Articles are hosted by Taylor and Francis Online.
The activity of a radioactive waste package is usually evaluated from gamma measurements associated with transfer functions. These functions are calculated assuming that both activity and mass distributions are homogeneous. But, generally, activity and mass distributions are not homogeneous. This paper evaluates the effect of heterogeneities on the activity measurements on families of similar waste packages. An error arises, with a systematic part, leading to an overestimation or underestimation of the overall activity in a family of similar waste packages, and a stochastic part, whose mean effect on the overall activity of the family is null.In order to evaluate the effect of heterogeneities, numerical simulation of the filling of each package has been performed. Some filling parameters are randomly varied, according to the known characteristics of the real packages, so that the mass and activity distributions are different from one package to another but are always coherent with the characteristics of the real packages.These numerical simulations produce virtual families of packages. A way to fit and demonstrate the representativeness of the virtual family is described, so that the general results computed on this virtual family are applicable for the real family.