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Conference Spotlight
2025 ANS Winter Conference & Expo
November 8–12, 2025
Washington, DC|Washington Hilton
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
Japan gets new U for enrichment as global power and fuel plans grow
President Trump is in Japan today, with a visit with new Prime Minister Sanae Takaichi on the agenda. Takaichi, who took office just last week as Japan’s first female prime minister, has already spoken in favor of nuclear energy and of accelerating the restart of Japan’s long-shuttered power reactors, as Reuters and others have reported. Much of the uranium to power those reactors will be enriched at Japan’s lone enrichment facility—part of Japan Nuclear Fuel Ltd.’s Rokkasho fuel complex—which accepted its first delivery of fresh uranium hexafluoride (UF₆) in 11 years earlier this month.
G. Hetsroni
Nuclear Science and Engineering | Volume 28 | Number 1 | April 1967 | Pages 1-11
Technical Paper | doi.org/10.13182/NSE67-A18661
Articles are hosted by Taylor and Francis Online.
Experimental studies have been conducted on scaled hydraulic models of large pressurized water reactors. Measurements were made of the effect of various internal geometries on the flow distribution at the core inlet and on the Euler numbers. Attention was focused on the relationship between the flow distribution and the length of the flow skirt, the length of the lower plenum and the layout of instrumentation tubes. The design of these components was optimized. Flow distributions in the annuli formed by the thermal shield and in the lower plenum were determined analytically and confirmed experimentally.
