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
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
Meeting Spotlight
2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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
May 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
July 2024
Nuclear Technology
June 2024
Fusion Science and Technology
Latest News
Bowman & Smith on NRC security programs
Greg Bowman and George Smith work for the Nuclear Regulatory Commission in implementing programs that deal with risk, whether to nuclear power plants or from nuclear materials, such as radiological sabotage and theft or diversion of materials. Bowman is the director of the NRC’s Division of Physical and Cybersecurity Policy in the Office of Nuclear Security and Incident Response. Smith is the senior project manager for security in the Source Management & Protection Branch of the Division of Materials Safety, Security, State, and Tribal Programs in the Office of Nuclear Material Safety and Safeguards.
The three initiatives Bowman and Smith discussed with Nuclear News editor-in-chief Rick Michal are the Insider Threat Program, the Cybersecurity Program, and the Domestic Safeguards Program.
Adimir dos Santos, Jamil Alves do Nascimento
Nuclear Technology | Volume 140 | Number 3 | December 2002 | Pages 233-254
Technical Paper | Fission Reactors | doi.org/10.13182/NT02-A3336
Articles are hosted by Taylor and Francis Online.
An Integral Lead Reactor (ILR) concept is proposed to be used in developing countries. The ILR is an association of the best characteristics of the American Integral Fast Reactor and of the Russian Lead-Cooled Reactor. The reactor is started with U-Zr and shifts cycle-by-cycle to the U-TRU-Zr fuel. Besides electricity generation an association of the ILR and a chemical heat pump for high-temperature industrial processes is idealized.Homogeneous reactor cores based on the American and Russian experiences on fast reactor technology have been designed for conception evaluation. The main core parameters are evaluated in the first and in the equilibrium cycles as a function of the pin diameter in the 6.35- to 10.4-mm range, pin pitch-to-diameter (p/d) ratio in the 1.308 to 1.495 range, and reactor power in the 300- to 1500-MW(electric) range. To mitigate the transient-overpower accident, a requisite is to have a burnup reactivity (kBu) < eff in the equilibrium cycle. The use of enriched uranium results in a poor core conversion ratio, and this fuel must be replaced as quickly as possible by the generated plutonium. In the equilibrium cycle the burnup reactivity goal is achieved for core power of 300 MW(electric) using a pin diameter of 10.4 mm and p/d of 1.308. The lead void reactivity is negative for reactor power lower than 750 MW(electric). The Doppler effect is small, as expected in a fast reactor loaded with metallic fuel. The fast fluence limit of 4.0 × 1023 n/cm2 is a restrictive parameter of the ILR, and to obtain the burnup of 100 GWd/t HM, a core optimization is needed. All the base accident evaluation and the optimization of the ILR are still to be performed.