Cross Section Generation Strategy for Advanced LWRs
Name
Herman-ICAPP-11393.pdf
Description
Accepted version
Size
2.01 MB
Format
Adobe PDF
Checksum (MD5)
330ba948efef7df81958d12ec9f595f2
Author(s)
Herman, Bryan R
Shwageraus, Eugene
Forget, Benoit Robert Yves
Leppaenen, Jaakko
Date Issued
May 2011
Journal
Proceedings of ICAPP 2011
Publisher
International Atomic Energy Agency (IAEA)
Citation
Herman, Bryan et al. "Cross Section Generation Strategy for Advanced LWRs." Proceedings of ICAPP 2011, 2-5 May, 2011, Nice, France, IAEA, 2011.
Version
Author's final manuscript
Abstract
A method for generating few-group homogenized cross sections using three-dimensional Monte Carlo assembly calculations is described and compared to a traditional two-dimensional assembly homogenization method. It is demonstrated that the traditional two-dimensional method of few-group homogenized cross section generation for full core analyses may not be sufficient for high conversion LWR designs. In these types of reactors, such as the Hitachi RBWR, separate fissile and blanket zones are required for breeding and for managing void reactivity feedback, resulting in highly axially-heterogeneous assemblies. In the two-dimensional calculation, each zone was decoupled from other zones by assuming zero net current boundary conditions. In the three-dimensional calculation, the presence of other axial zones that influence the generation of homogenized cross sections is explicitly captured. Differences in flux energy spectra were seen, leading to differences in 2-group homogenized cross sections of up to 50%. The differences in the homogenized parameters were highest in interface zones and near the top of the assembly due to the presence of an axial reflector and a high coolant void fraction. It was determined that these errors may be significant and propagate to the full core analysis of these types of advanced LWRs.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://inis.iaea.org/search/search.aspx?orig_q=RN:44092964
