ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Education, Training & Workforce Development
The Education, Training & Workforce Development Division provides communication among the academic, industrial, and governmental communities through the exchange of views and information on matters related to education, training and workforce development in nuclear and radiological science, engineering, and technology. Industry leaders, education and training professionals, and interested students work together through Society-sponsored meetings and publications, to enrich their professional development, to educate the general public, and to advance nuclear and radiological science and engineering.
Meeting Spotlight
2025 ANS Annual Conference
June 15–18, 2025
Chicago, IL|Chicago Marriott Downtown
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!
Latest Magazine Issues
Jun 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
July 2025
Nuclear Technology
Fusion Science and Technology
Latest News
Smarter waste strategies: Helping deliver on the promise of advanced nuclear
At COP28, held in Dubai in 2023, a clear consensus emerged: Nuclear energy must be a cornerstone of the global clean energy transition. With electricity demand projected to soar as we decarbonize not just power but also industry, transport, and heat, the case for new nuclear is compelling. More than 20 countries committed to tripling global nuclear capacity by 2050. In the United States alone, the Department of Energy forecasts that the country’s current nuclear capacity could more than triple, adding 200 GW of new nuclear to the existing 95 GW by mid-century.
Yoshiaki Oka, Sei-Ichi Koshizuka
Nuclear Technology | Volume 103 | Number 3 | September 1993 | Pages 295-302
Technical Paper | Fission Reactor | doi.org/10.13182/NT93-A34852
Articles are hosted by Taylor and Francis Online.
The concept of a super critical-pressure, direct-cycle light water reactor is presented. Its feasibility is assessed by a study of its neutronic and thermal-hydraulic design. The system pressure is 250 bars. The coolant density decreases continuously in the core, and the coolant is fed directly to the turbines. This eliminates the recirculation system, steam separators, and dryers. The diameter of the reactor pressure vessel is smaller than that of a pressurized water reactor (PWR), and the vessel wall is not very thick despite the high pressure. The required core flow rate is about one-eighth that of a PWR. There are only two coolant loops in a 1145-MW(electric) reactor, and the turbines are smaller than those of a light water reactor. These features greatly simplify the reactor plant. The thermal efficiency is improved 19% over that of a PWR.
