High-fidelity multiphysics simulation of BWR assembly with coupled TORT-TD/CTF
2012
This paper describes the application of the coupled codes
TORT-TD and CTF to the pin-by-pin modeling of a BWR fuel assembly with
thermal-hydraulicfeedback.
TORT-TD, developed at GRS, is a time-dependent three dimensional discrete ordinates code. CTF is the PSU's improved version of the subchannel code COBRA-TF, which uses a two-fluid, three-field model to represent
two-phase flowwith entrained droplets, and is commonly applied to evaluate LWR safety margins. The coupled codes system
TORT-TD/CTF, already applied to several PWR cases involving MOX, was adapted from PWR to BWR applications. The purpose of the research described in this paper is to verify the coupling for modeling
two-phase flowat the pin cell level. Using an ATRIUM-10 assembly, the system's steady-state capabilities were tested on two cases: one without control blade insertion and another with partially inserted blades. The influence of the neutron absorber on local axial and radial parameters is presented. The description of an inlet flow reduction transient is an example for the time-dependent capability of the coupled system. (authors)
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