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
2026 Nuclear Energy Conference & Expo (NECX)
August 24–27, 2026
Dallas, TX|Hilton Anatole
Latest Magazine Issues
Jun 2026
Jan 2026
2026
Latest Journal Issues
Nuclear Science and Engineering
July 2026
Nuclear Technology
June 2026
Fusion Science and Technology
May 2026
Latest News
Spent fuel recycling and conditioning topic of U.S.-Japan meeting
Officials with the Department of Energy’s Office of Environmental Management discussed spent nuclear fuel recycling and conditioning with counterparts from Japan during the 13th U.S.-Japan Technical Meeting of the Civil Nuclear Energy Research and Development Working Group, held recently in Santa Fe, N.M.
B. L. Koponen
Nuclear Technology | Volume 34 | Number 2 | July 1977 | Pages 242-248
Technical Paper | Chemical Processing | doi.org/10.13182/NT77-A39700
Articles are hosted by Taylor and Francis Online.
Some storage and transportation arrays become more reactive when the fissile material density is reduced. We have calculated this effect for arrays of shipping containers and for arrays of 235U spheres. The reactivity enhancement is due mainly to increased utilization of thermal neutrons and reduction in neutron leakage resulting from the increased size of low-density units.