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
Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
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.
G. Rudstam
Nuclear Science and Engineering | Volume 80 | Number 2 | February 1982 | Pages 238-255
Technical Paper | doi.org/10.13182/NSE82-A21428
Articles are hosted by Taylor and Francis Online.
Group parameters (abundances and half-lives) and group spectra have been derived from the nuclear data and fission yields of the individual precursors for six delayed-neutron groups and for the fissionable nuclides 232Th, 233U, 235U, 236U, 238U, 237Np, 239Pu, 240Pu, 241Pu, 242Pu, and 252Cf. The results can be combined into a calculation of the resulting delayed-neutron energy spectrum at any cooling time and for any mixture of the above-mentioned nuclides. The validity of the method is checked in various ways such as comparing total neutron yields and group yields with the corresponding experimental quantities and comparing neutron spectra for half-life groups 2, 3, and 4 with integral experimental measurements. The outcome of these tests puts confidence in using the spectra obtained for applications within nuclear technology.