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
Jul 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
August 2025
Fusion Science and Technology
Latest News
Remembering ANS member Gil Brown
Brown
The nuclear community is mourning the loss of Gilbert Brown, who passed away on July 11 at the age of 77 following a battle with cancer.
Brown, an American Nuclear Society Fellow and an ANS member for nearly 50 years, joined the faculty at Lowell Technological Institute—now the University of Massachusetts–Lowell—in 1973 and remained there for the rest of his career. He eventually became director of the UMass Lowell nuclear engineering program. After his retirement, he remained an emeritus professor at the university.
Sukesh Aghara, chair of the Nuclear Engineering Department Heads Organization, noted in an email to NEDHO members and others that “Gil was a relentless advocate for nuclear energy and a deeply respected member of our professional community. He was also a kind and generous friend—and one of the reasons I ended up at UMass Lowell. He served the university with great dedication. . . . Within NEDHO, Gil was a steady presence and served for many years as our treasurer. His contributions to nuclear engineering education and to this community will be dearly missed.”
Mohammad Abdul Motalab, Woosong Kim, Yonghee Kim
Nuclear Technology | Volume 205 | Number 9 | September 2019 | Pages 1185-1204
Technical Paper | doi.org/10.1080/00295450.2019.1582942
Articles are hosted by Taylor and Francis Online.
This paper is concerned with an improved two-step methodology based on the nodal equivalence theory for more accurate and consistent CANDU reactor analysis. In addition, the albedo-corrected parameterized equivalence constants (APEC) method is introduced to achieve further improvement of the nodal solution by correcting the burnup-dependent cross sections (XSs) and discontinuity factors (DFs). The APEC algorithm is incorporated into an in-house nodal expansion method (NEM) code. Colorset calculations are performed to obtain physically meaningful leakage information of the fuel lattice, and the results are used for generating burnup-dependent APEC functions to correct groupwise XSs and DFs. The NEM-equivalent reference DF on each surface of the colorset are calculated for a coarse mesh (1 × 1 mesh per fuel assembly) using the net-current boundary conditions. These reference DFs are used to determine the DF APEC functions. A separate set of burnup-dependent APEC functions is generated for the fuel lattice loaded with a reactivity device. Both position- and burnup-dependent APEC functions are applied for accurate CANDU core analysis. A two-dimensional CANDU whole-core nodal analysis is performed to show the effectiveness of the APEC corrections. Moreover, several variants of the original benchmark are also analyzed with the same APEC functions to confirm the general applicability of the predetermined APEC functions. In addition, NEM calculations are performed for a CANDU core with a reactivity device and its variants with different burnup profiles. Numerical results show that the APEC-based two-step nodal methodology can provide an accurate and consistent solution for burned CANDU cores with reactivity device.
