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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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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.
Yuh Ming Ferng, Yung Shin Tseng, Bau Shei Pei, S. Long Wang, Chunkuan Shih, Tsun Fu Hung
Nuclear Technology | Volume 162 | Number 3 | June 2008 | Pages 308-322
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT08-A3958
Articles are hosted by Taylor and Francis Online.
In this paper, possible influences of power uprate on the distribution characteristics of erosion-corrosion (E/C) wear sites were analyzed through proper two-phase models. These models include three-dimensional two-phase computational fluid dynamics (CFD) simulations and appropriate E/C analysis. An analytical approach was applied to boiling water reactors. Based on the simulation results, the present CFD simulations successfully predicted two-phase phenomena that occurred in the piping system including centrifugal effects, gravitational effects, an imbalance of phase and mass separation in a T-junction, etc. When coupled with the calculated two-phase flow structures, the appropriate E/C models can be used to indicate the local distributions of severe E/C wear sites on the wall of the fittings. This shows a reasonable agreement with the plant-measured results. With these models, the impacts of power uprate on the distribution characteristics of E/C wear sites can be investigated. Comparisons between the calculated results for 100, 105, and 110% power levels clearly reveal that the power uprate has an insignificant effect on the distribution characteristics of wear sites for the selected piping system under investigation, especially in the wear ranges.
