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Mathematics & Computation
Division members promote the advancement of mathematical and computational methods for solving problems arising in all disciplines encompassed by the Society. They place particular emphasis on numerical techniques for efficient computer applications to aid in the dissemination, integration, and proper use of computer codes, including preparation of computational benchmark and development of standards for computing practices, and to encourage the development on new computer codes and broaden their use.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
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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Industry Update—May 2025
Here is a recap of industry happenings from the recent past:
TerraPower’s Natrium reactor advances on several fronts
TerraPower has continued making aggressive progress in several areas for its under-construction Natrium Reactor Demonstration Project since the beginning of the year. Natrium is an advanced 345-MWe reactor that has liquid sodium as a coolant, improved fuel utilization, enhanced safety features, and an integrated energy storage system, allowing for a brief power output boost to 500-MWe if needed for grid resiliency. The company broke ground for its first Natrium plant in 2024 near a retiring coal plant in Kemmerer, Wyo.
Tsutomu Sakurai, Akira Takahashi, Niro Ishikawa, Yoshihide Komaki
Nuclear Technology | Volume 83 | Number 1 | October 1988 | Pages 24-30
Technical Paper | Fuel Cycle | doi.org/10.13182/NT88-A34172
Articles are hosted by Taylor and Francis Online.
The composition of NOx generated in the dissolution of UO2 has been described in different ways by earlier authors. Finding a way to determine the NOx composition in the dissolution included experiments concerning the reactions of NO and NO2 with 3 to 6 M HNO3. The following conclusions have been obtained for the dissolution: (a) of the NOx, NO is the direct product of the dissolution [3UO2 + 8HNO3 → 3UO2(NO3)2 + 2NO + 4H2O]; (b) part of the NO is converted quickly to NO2 by the second reaction, i.e., NO + 2HNO3→ 3NO2 + H2O (the equilibrium constant of this reaction determines the NOx composition); (c) the dissolution is therefore expressible as 3UO2 + 4(2 + x)HNO3→3UO2(NO3)2 + 2(1 — x)NO + 6xNO2 + 2(2 + x)H2O, (0 < × < 1) (some values of the × were obtained); (d) the amount of NO2 in the NOx is considerably smaller than that reported by earlier authors, e.g., 25% for 6.7 MHNO3 at 101°C; (e) UO2(NO3)2 coexisting in the solution tends to increase the NO component in the NOx.
