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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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Inkjet droplets of radioactive material enable quick, precise testing at NIST
Researchers at the National Institute of Standards and Technology have developed a technique called cryogenic decay energy spectrometry capable of detecting single radioactive decay events from tiny material samples and simultaneously identifying the atoms involved. In time, the technology could replace characterization tasks that have taken months and could support rapid, accurate radiopharmaceutical development and used nuclear fuel recycling, according to an article published on July 8 by NIST.
Dong Zheng, Julie M. Jarvis, Serena Allison-Ptak, Gregory Brauer, Michael Hopman (Bechtel NS&E)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 355-364
This paper determines the hydrogen generated during the course of a severe accident in one reactor unit with crossflow through the hardened containment vent piping to the adjacent reactor unit. The hardened pipe vent systems of both units are joined at the mixing chamber at the base of the stack. Per RELAP5 code simulation results, hydrogen will retain significant concentrations in the mixing chamber regions and at the entrances of the connected pipes during the high pressure venting stage of the proposed venting scenario. The concentration of hydrogen will drop after the transition to the low pressure venting. The time required to reduce hydrogen concentration to less than 4% from the connected pipes vary depending on the sizes and location of the pipes. The results and conclusions can be used to support the HCVS design changes to provide severe accident venting capability and compliance with Phases 1 and 2 of the NRC Order EA-13-109.