ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
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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August 2024
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.
S. P. Monahan, W. L. Filippone
Nuclear Science and Engineering | Volume 107 | Number 3 | March 1991 | Pages 201-216
Technical Paper | doi.org/10.13182/NSE91-A23785
Articles are hosted by Taylor and Francis Online.
An integral discrete ordinates method designed for use on modern, large-memory, vector and/or parallel processing supercomputers has been developed. The method is similar to conventional Sn techniques in that the medium is divided into spatial mesh cells and discrete directions are used. However, in place of an approximate differencing scheme, a nearly exact matrix representation of the streaming operator is determined. Although extremely large, this matrix can be stored on today’s large-memory computers for repeated use in the source iteration. Since the source iteration is cast in matrix form, it benefits enormously from vector and/or parallel processing, if available. Several electron transport test results are presented demonstrating a reduction in numerical diffusion and elimination of observable ray effects.