TY - GEN
T1 - Impact of implicit effects on uncertainties and sensitivities of the Doppler coefficient of a LWR pin cell
AU - Hursin, Mathieu
AU - Leray, Olivier
AU - Perret, Gregory
AU - Pautz, Andreas
AU - Bostelmann, Friederike
AU - Aures, Alexander
AU - Zwermann, Winfried
N1 - Publisher Copyright:
© The Authors, published by EDP Sciences, 2017.
PY - 2017/9/13
Y1 - 2017/9/13
N2 - In the present work, PSI and GRS sensitivity analysis (SA) and uncertainty quantification (UQ) methods, SHARK-X and XSUSA respectively, are compared for reactivity coefficient calculation; for reference the results of the TSUNAMI and SAMPLER modules of the SCALE code package are also provided. The main objective of paper is to assess the impact of the implicit effect, e.g., considering the effect of cross section perturbation on the self-shielding calculation, on the Doppler coefficient SA and UQ. Analyses are done for a Light Water Reactor (LWR) pin cell based on Phase I of the UAM LWR benchmark. The negligence of implicit effects in XSUSA and TSUNAMI leads to deviations of a few percent between the sensitivity profiles compared to SAMPLER and TSUNAMI (incl. implicit effects) except for 238U elastic scattering. The implicit effect is much larger for the SHARK-X calculations because of its coarser energy group structure between 10 eV and 10 keV compared to the applied SCALE libraries. It is concluded that the influence of the implicit effect strongly depends on the energy mesh of the nuclear data library of the neutron transport solver involved in the UQ calculations and may be magnified by the response considered.
AB - In the present work, PSI and GRS sensitivity analysis (SA) and uncertainty quantification (UQ) methods, SHARK-X and XSUSA respectively, are compared for reactivity coefficient calculation; for reference the results of the TSUNAMI and SAMPLER modules of the SCALE code package are also provided. The main objective of paper is to assess the impact of the implicit effect, e.g., considering the effect of cross section perturbation on the self-shielding calculation, on the Doppler coefficient SA and UQ. Analyses are done for a Light Water Reactor (LWR) pin cell based on Phase I of the UAM LWR benchmark. The negligence of implicit effects in XSUSA and TSUNAMI leads to deviations of a few percent between the sensitivity profiles compared to SAMPLER and TSUNAMI (incl. implicit effects) except for 238U elastic scattering. The implicit effect is much larger for the SHARK-X calculations because of its coarser energy group structure between 10 eV and 10 keV compared to the applied SCALE libraries. It is concluded that the influence of the implicit effect strongly depends on the energy mesh of the nuclear data library of the neutron transport solver involved in the UQ calculations and may be magnified by the response considered.
UR - http://www.scopus.com/inward/record.url?scp=85030485309&partnerID=8YFLogxK
U2 - 10.1051/epjconf/201714609034
DO - 10.1051/epjconf/201714609034
M3 - Conference contribution
AN - SCOPUS:85030485309
T3 - EPJ Web of Conferences
BT - ND 2016
A2 - Siegler, Peter
A2 - Mondelaers, Wim
A2 - Plompen, Arjan
A2 - Hambsch, Franz-Josef
A2 - Schillebeeckx, Peter
A2 - Kopecky, Stefan
A2 - Heyse, Jan
A2 - Oberstedt, Stephan
PB - EDP Sciences
T2 - 2016 International Conference on Nuclear Data for Science and Technology, ND 2016
Y2 - 11 September 2016 through 16 September 2016
ER -