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Conference Spotlight
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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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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Latest News
IAEA again raises global nuclear power projections
Noting recent momentum behind nuclear power, the International Atomic Energy Agency has revised up its projections for the expansion of nuclear power, estimating that global nuclear operational capacity will more than double by 2050—reaching 2.6 times the 2024 level—with small modular reactors expected to play a pivotal role in this high-case scenario.
IAEA director general Rafael Mariano Grossi announced the new projections, contained in the annual report Energy, Electricity, and Nuclear Power Estimates for the Period up to 2050 at the 69th IAEA General Conference in Vienna.
In the report’s high-case scenario, nuclear electrical generating capacity is projected to increase to from 377 GW at the end of 2024 to 992 GW by 2050. In a low-case scenario, capacity rises 50 percent, compared with 2024, to 561 GW. SMRs are projected to account for 24 percent of the new capacity added in the high case and for 5 percent in the low case.
Dimitri Gidaspow, Firooz Rasouli, Yong W. Shin
Nuclear Science and Engineering | Volume 84 | Number 3 | July 1983 | Pages 179-195
Technical Paper | doi.org/10.13182/NSE83-A17788
Articles are hosted by Taylor and Francis Online.
A six-equation model for a one-dimensional, transient, two-phase flow is briefly discussed, and the characteristic and compatibility equations are obtained by the method of characteristics. The equations consist of five conservation equations and a constitutive relative-velocity equation. The model equations constitute a well-posed initial value problem and have real characteristics in all flow regimes. The ordinary differential equations obtained are suitable for numerical applications, such as for blowdown analyses. The special case of an isothermal unequal velocity model is applied to the case of inflow of a liquid sodium-argon mixture into a horizontal pipe and to the case of pressure pulse propagation rate in an air-water system. The expected S-shaped curves are obtained for the volume fraction of liquid sodium. The numerical results for the pressure pulse propagation agree with experimental data at low-volume fractions.
