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Nuclear Criticality Safety
NCSD provides communication among nuclear criticality safety professionals through the development of standards, the evolution of training methods and materials, the presentation of technical data and procedures, and the creation of specialty publications. In these ways, the division furthers the exchange of technical information on nuclear criticality safety with the ultimate goal of promoting the safe handling of fissionable materials outside reactors.
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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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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.
H. Märten, A. Ruben, D. Seeliger
Nuclear Science and Engineering | Volume 109 | Number 2 | October 1991 | Pages 120-127
Technical Paper | doi.org/10.13182/NSE91-A28511
Articles are hosted by Taylor and Francis Online.
A phenomenological scission point model including temperature-dependent shell effects is used to solve the energy partition problem as a function of mass asymmetry (A1/A2) for plutonium fission. Relevant fragment data such as average excitation energy and total kinetic energy are used as the basis for applying a temperature distribution model based on the Madland-Nix theory that includes the full mass number dependence of spectra, a realistic temperature distribution of fragments, a modified center-of-mass (CMS) spectrum ansatz, CMS anisotropy of neutron emission, and competition of neutron and gamma-ray emission. This new model describes neutron multiplicity, energy, and angular distribution of prompt fission neutrons. Calculated data for 238Pu, 240Pu, and 242Pu spontaneous fission are presented and discussed in comparison with experimental data.
