Manuele Aufiero

Uncertainty Analysis of the TRU-Burning Thorium-Fueled RBWR Using Generalized Perturbation Theory

Author(s): Bogetic, S; Gorman, P; Aufiero, M; Fratoni, M; Greenspan, E; Vujic, J | Abstract: Copyright

Generalized Sensitivity Analysis With Continuous-Energy Monte Carlo Code RMC

Recently, capabilities to compute eigenvalue sensitivity coefficients to nuclear data have been developed by several continuous-energy Monte Carlo codes, e. g., the Reactor Monte Carlo code RMC [1] developed by Tsinghua University, China. These capabilities should be extended to analyze a generalized set of response, such as power distributions and multi-group cross-sections. Therefore, several methods have been put forward to achieve this objective. These methods can be divided into three kinds. The first kind are direct perturbation based methods [2], which are time-consuming since multiple direct perturbation calculations are required to perform. The second kind are methods based on generalized perturbation theory (GPT), including the GEAR-MC method [3] implemented in continuousenergy TSUNAMI-3D and the collision history-based approach implemented in SERPENT [4]. The third kind are specific approaches, such as the differential operator sampling method [5]. However, the differential operator sampling method may be not accurate enough [3] since it ignores the impact of perturbations and cross-section uncertainties on the fission source.