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
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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
Aug 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
August 2025
Fusion Science and Technology
Latest News
Chris Wagner: The role of Eden Radioisotopes in the future of nuclear medicine
Chris Wagner has more than 40 years of experience in nuclear medicine, beginning as a clinical practitioner before moving into leadership roles at companies like Mallinckrodt (now Curium) and Nordion. His knowledge of both the clinical and the manufacturing sides of nuclear medicine laid the groundwork for helping to found Eden Radioisotopes, a start-up venture that intends to make diagnostic and therapeutic raw material medical isotopes like molybdenum-99 and lutetium-177.
Man Gyun Na, Belle R. Upadhyaya, Jung In Choi
Nuclear Science and Engineering | Volume 129 | Number 3 | July 1998 | Pages 283-293
Technical Paper | doi.org/10.13182/NSE98-A1982
Articles are hosted by Taylor and Francis Online.
A multivariable adaptive control algorithm is applied to the axial flux shape control in a pressurized water reactor. This is one of the most challenging control problems in the nuclear field. The reactor model used for computer simulations is a two-point xenon oscillation model based on the nonlinear xenon and iodine balance equations and a one-group, one-dimensional, neutron diffusion equation having nonlinear power reactivity feedback that adequately describes axial oscillations and treats the nonlinearities explicitly. The reactor core is axially divided into two regions, and it is considered that each region has one input and one output and is coupled with the other region. The control parameters are updated on-line with the generalized least-squares method to adjust the varying operating conditions. Therefore, this algorithm is able to treat the varying operating conditions well. Also, this control algorithm exhibits very fast responses due to the step and ramp changes of target axial shape without any residual flux oscillations between the upper and lower halves of the reactor core.