ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
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Division Spotlight
Accelerator Applications
The division was organized to promote the advancement of knowledge of the use of particle accelerator technologies for nuclear and other applications. It focuses on production of neutrons and other particles, utilization of these particles for scientific or industrial purposes, such as the production or destruction of radionuclides significant to energy, medicine, defense or other endeavors, as well as imaging and diagnostics.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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Nuclear Science and Engineering
March 2025
Nuclear Technology
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April 2025
Latest News
Penn State and Westinghouse make eVinci microreactor plan official
Penn State and Westinghouse Electric Company are working together to site a new research reactor on Penn State’s University Park, Pa., campus: Westinghouse’s eVinci, a HALEU TRISO-fueled sodium heat-pipe reactor. Penn State has announced that it submitted a letter of intent to host and operate an eVinci reactor to the Nuclear Regulatory Commission on February 28 and plans to engage with the NRC on specific siting decisions. Penn State already boasts the Breazeale reactor, which began operating in 1955 as the first licensed research reactor at a university in the United States. At 70, the Breazeale reactor is still in operation.
J. A. Fleck, Jr.
Nuclear Science and Engineering | Volume 2 | Number 5 | September 1957 | Pages 694-708
Technical Paper | doi.org/10.13182/NSE57-A25437
Articles are hosted by Taylor and Francis Online.
The linearized hydrodynamic equations governing the expansion of a frictionless compressible coolant from a cylindrical untapered reactor core admit an exact solution. The pressure so obtained depends only on the time required for an acoustic signal to travel from the core boundary to the core center and is quite independent of the amount of fluid external to the reactor. The pressure should behave similarly in the case of moderate tapering of the core. In the case of extreme tapering it is necessary to consider the external fluid as incompressible. In this case it is possible to obtain an approximate solution for the pressure, which does depend on the amount of external fluid.
