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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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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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The 2025 edition is a reinvigoration of the withdrawn ANS-54.8-1988 of the same title.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.
E. Hellstrand, P. Blomberg, S. Hörner
Nuclear Science and Engineering | Volume 8 | Number 6 | December 1960 | Pages 497-506
Technical Paper | doi.org/10.13182/NSE60-A25835
Articles are hosted by Taylor and Francis Online.
The temperature coefficient of the resonance integral for uranium metal and oxide has been measured over a wide temperature range for rods with different diameters. The activation method was used and the 106 kev γ ray following the N239 decay was measured with a pulse-height analyzer. The resonance integral has been expressed as a linear function of The following approximate relations have been found. , The results have been compared with calculated values published elsewhere. The experimental values lie lower than most theoretical ones, but in several cases there is agreement within the common limits of error.
