TY - GEN

T1 - A hybrid transport-point kinetic method for the analysis of source transients in subcritical systems

AU - Picca, Paolo

AU - Ganapol, Barry D.

AU - Furfaro, Roberto

PY - 2010/12/1

Y1 - 2010/12/1

N2 - The paper describes a novel technique for approximating the time-dependent neutron transport equation in the simulation of source-driven transients. The methodology, based on a physical intuition, adopts a multi-generational approach to improve the accuracy of lumped parameter approximations and better account for the propagation effects typical of a source switch-on. More precisely, the first few neutron generations are simulated collision by collision through the Boltzmann equation while a simplified lumped parameter model is adopted for the multiply collided neutrons. Numerical simulations prove that a significant gain in accuracy is obtained compared to classical point kinetics, especially for detector signal analysis. In terms of computational costs, the technique is more time consuming than point kinetics but, at low orders, remains sensibly faster than fulll time dependent transport solution or quasi-static approximations.

AB - The paper describes a novel technique for approximating the time-dependent neutron transport equation in the simulation of source-driven transients. The methodology, based on a physical intuition, adopts a multi-generational approach to improve the accuracy of lumped parameter approximations and better account for the propagation effects typical of a source switch-on. More precisely, the first few neutron generations are simulated collision by collision through the Boltzmann equation while a simplified lumped parameter model is adopted for the multiply collided neutrons. Numerical simulations prove that a significant gain in accuracy is obtained compared to classical point kinetics, especially for detector signal analysis. In terms of computational costs, the technique is more time consuming than point kinetics but, at low orders, remains sensibly faster than fulll time dependent transport solution or quasi-static approximations.

KW - Accelerator-driven systems

KW - Point kinetics

KW - Time-dependent transport theory

UR - http://www.scopus.com/inward/record.url?scp=79952365511&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79952365511&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:79952365511

SN - 9781617820014

T3 - International Conference on the Physics of Reactors 2010, PHYSOR 2010

SP - 387

EP - 396

BT - International Conference on the Physics of Reactors 2010, PHYSOR 2010

T2 - International Conference on the Physics of Reactors 2010, PHYSOR 2010

Y2 - 9 May 2010 through 14 May 2010

ER -