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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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Deep Space: The new frontier of radiation controls
In commercial nuclear power, there has always been a deliberate tension between the regulator and the utility owner. The regulator fundamentally exists to protect the worker, and the utility, to make a profit. It is a win-win balance.
From the U.S. nuclear industry has emerged a brilliantly successful occupational nuclear safety record—largely the result of an ALARA (as low as reasonably achievable) process that has driven exposure rates down to what only a decade ago would have been considered unthinkable. In the U.S. nuclear industry, the system has accomplished an excellent, nearly seamless process that succeeds to the benefit of both employee and utility owner.
Melvin M. Levine
Nuclear Science and Engineering | Volume 7 | Number 6 | June 1960 | Pages 545-551
Technical Paper | doi.org/10.13182/NSE60-A25764
Articles are hosted by Taylor and Francis Online.
Breeding ratios for clean near-thermal systems containing only U233 and moderator have been presented by Chernick and Moore (1). The present work treats Pu239 systems also and extends the results in both systems to take account of the effects of the higher isotopes and fission products. The extra absorption by these higher isotopes tends to depress the breeding ratio, but fission in U235 or Pu241 compensate for this, and the net effect, as will be seen, is an increase in breeding ratio for plutonium-fuelled systems.
