A DETERMINISTIC METHOD FOR TRANSIENT, THREE-DIMENSIONAL NUETRON TRANSPORT [report]

S. Goluoglu, C. Bentley, R. Demeglio, M. Dunn, K. Norton, R. Pevey, I. Suslov, H. L. Dodds
1998 unpublished
TfM --r7os A deterministic method for solving the time-dependent, three-dimensional Boltzmann transport equation with explicit representation of delayed neutrons has been developed and evaluated. The methodology used in this study for the time variable of the neutron flux is known as the improved quasi-static (IQS) method. The position, energy, and angle-dependent neutron flux is computed deterministical1y by using the three-dimensional discrete ordinates code TORT. This paper briefly describes
more » ... r briefly describes the methodology and selected results. The code developed at the University of Tennessee based on this methodology is called TDTORT. TDTORT can be used to model transients involving voided and/or strongly absorbing regions that require transport theory for accuracy. This code can als:, be used to mode1 either small high-leakase systems, such as space reactors, or asymmetric control rod movements. TDTORT can model step, ramp, step followed by another step, and step followed by ramp type perturbations. It can also model columnwise rod movement can also be modeled. A special , case of columnwise rod movement in a three-dimensional model of a boiling water reactor (BWR) with simple adiabatic feedback is also included. TIITORT is verified through several transient one-dimensional, twodimensional, and three-dimensional beiichmark problems. The results show that the transport methodology and corresponding code developed in this work have sufficient accuracy and speed for computing the dynamic behavior of complex multi-dimensional neutronic systems.
doi:10.2172/776452 fatcat:taedgqcmxjfzdkw3uuhabxgceq