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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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Latest News
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.
Yigal Ronen, Melvin J. Leibson
Nuclear Technology | Volume 79 | Number 1 | October 1987 | Pages 20-34
Technical Paper | Fission Reactor | doi.org/10.13182/NT87-A16002
Articles are hosted by Taylor and Francis Online.
In the multispectrum high convertor pressurized water reactor, the core is divided into several regions with a different moderator-to-fuel (M/F) volume ratio specified in each region. This results in a variation of the neutron spectrum in the reactor. As the average M/F ratio is low (tight-lattice configuration), the resulting spectrum in the reactor is hard and a high conversion ratio can thus be achieved. In addition, the difference in the M/F ratio allows for a better negative reactivity void response as compared to a similar monospectrum reactor. Analysis and optimization of such a reactor concept are presented and discussed.
