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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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A new ANSI/ANS standard for liquid metal fire protection published
ANSI/ANS-54.8-2025, Liquid Metal Fire Protection in LMR Plants, received approval from the American National Standards Institute on September 2 and is now available for purchase.
The 2025 edition is a reinvigoration of the withdrawn ANS-54.8-1988 of the same title. The Advanced Reactor Codes and Standards Collaborative (ARCSC) identified the need for a current version of the standard via an industry survey.
Typical liquid metal reactor designs use liquid sodium as the coolant for both the primary and intermediate heat-transport systems. In addition, liquid sodium and NaK (a mixture of sodium and potassium that is liquid at room temperature) are often used in auxiliary heat-removal systems. Since these liquid metals can react readily with oxygen, water, and other compounds, special precautions must be taken in the design, construction, testing, and maintenance of the sodium/NaK systems to ensure that the potential for leakage is very small.
W. R. Conkie
Nuclear Science and Engineering | Volume 18 | Number 3 | March 1964 | Pages 370-375
Technical Paper | doi.org/10.13182/NSE64-A20057
Articles are hosted by Taylor and Francis Online.
An iterative method has been developed for the solution of neutron-transport problems. The method is formulated within the framework of a spherical-harmonics method. The method is developed first for one-group problems, then for more general velocity-dependent problems. The method is illustrated by application to the Milne problem for the one-group case and also to a velocity-dependent variation of the Milne problem. Good accuracy is obtained for both cases.
