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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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
BWXT will scout potential TRISO fuel production sites in Wyoming
BWX Technologies Inc. announced today that its Advanced Technologies subsidiary has signed a cooperation agreement with the state of Wyoming to evaluate locations and requirements for siting a potential new TRISO nuclear fuel fabrication facility in the state.
Ray C. Daniel
Nuclear Technology | Volume 14 | Number 2 | May 1972 | Pages 171-186
Technical Paper | Material | doi.org/10.13182/NT72-A31133
Articles are hosted by Taylor and Francis Online.
Diameter and length changes have been measured for 0.25- to 0.30-in.-o.d. fuel rods having Zircaloy-4 cladding thicknesses from 17 to 22 mil. The external coolant pressure (2000 psi) yielded hoop stresses in the range of 11 000 to 15 000 psi. Short rods (6 to 11 in.) were irradiated in an experimental test reactor (ETR) loop [peak fast flux ≅ 1.5 x 1014 n/(cm2 sec) while long rods (∼10 ft) were irradiated in a NRX loop [2.5 x 1013 n/(cm2 sec)]. A method has been developed for separating components of the diameter and length changes caused by Zircaloy growth, external pressure, and fuel-clad interactions. It is concluded that the diameter shrinkages of the former rods (up to about 1 mil, 0.4%) were caused entirely by the external pressure. However, those of the latter rods (up to ∼2 mil, 0.8%) were strongly dependent on fuel-clad interactions, with large diameter shrinkages accompanied by large length increases (up to about 0.7%). A calculational method based on the CYGRO computer program simulates such behavior for long rods.