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.
Explore membership for yourself or for your organization.
Conference Spotlight
2025 ANS Winter Conference & Expo
November 9–12, 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!
Latest Magazine Issues
Sep 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
Fusion Science and Technology
October 2025
Latest News
Empowering the next generation: ANS’s newest book focuses on careers in nuclear energy
A new career guide for the nuclear energy industry is now available: The Nuclear Empowered Workforce by Earnestine Johnson. Drawing on more than 30 years of experience across 16 nuclear facilities, Johnson offers a practical, insightful look into some of the many career paths available in commercial nuclear power. To mark the release, Johnson sat down with Nuclear News for a wide-ranging conversation about her career, her motivation for writing the book, and her advice for the next generation of nuclear professionals.
When Johnson began her career at engineering services company Stone & Webster, she entered a field still reeling from the effects of the Three Mile Island incident in 1979, nearly 15 years earlier. Her hiring cohort was the first group of new engineering graduates the company had brought on since TMI, a reflection of the industry-wide pause in nuclear construction. Her first long-term assignment—at the Millstone site in Waterford, Conn., helping resolve design issues stemming from TMI—marked the beginning of a long and varied career that spanned positions across the country.
J. Phelps, H. Windsor, H. Takahashi, J. Conant, K. Chandramoleswar
Nuclear Science and Engineering | Volume 49 | Number 3 | November 1972 | Pages 274-300
Technical Paper | doi.org/10.13182/NSE72-A22542
Articles are hosted by Taylor and Francis Online.
Measurements using a fast critical assembly were performed in conjunction with the Brookhaven Fast Research Reactor Study. Cores made of highly enriched uranium, stainless steel, and aluminum, reflected mostly by stainless steel were used to obtain broad survey information, and, concurrently, to test the preliminary theoretical model. Quantities measured included critical mass, characteristics of movable reflector blocks, prompt neutron lifetime, worth of materials in potential control positions, neutron yield for a given power, and moderator block characteristics; the first three of these have been compared with calculations.
