We study the effects of fuel temperature approximation made in the history part of group constant generation for a boiling water reactor (BWR) assembly. We compare produced nuclide densities and group constants when the burnup calculation in the history part uses either realistic fuel temperatures provided by a fuel performance code or an effective flat and constant fuel temperature. The results mirror our previous findings for PWR assemblies: The fuel temperature approximation has a noticeable effect on gadolinium burnout and production of fissile actinides. Differences in the actinide content of the assembly are further reflected into homogenized absorption and fission cross sections at high burnups.
|Title of host publication||Proceedings of the PHYSOR 2018, Cancun, Mexico|
|Publisher||American Nuclear Society ANS|
|Number of pages||12|
|Publication status||Accepted/In press - 2018|
|MoE publication type||Not Eligible|
|Event||PHYSOR 2018: Reactor Physics Paving The Way Towards More Efficient Systems - Cancun, Mexico|
Duration: 22 Apr 2018 → 26 Apr 2018
|Abbreviated title||PHYSOR 2018|
|Period||22/04/18 → 26/04/18|
Valtavirta, V., & Leppänen, J. (Accepted/In press). Effects of fuel temperature history approximations on neutronics properties of a BWR assembly. In Proceedings of the PHYSOR 2018, Cancun, Mexico (pp. 2215-2226). American Nuclear Society ANS.