The Consortium for Advanced Simulation of Light Water Reactors (CASL) is a U.S.
Department of Energy (DOE) Innovation Hub, established in July 2010 for the modeling and
simulation of nuclear reactors. In 2016, the VERA Core Simulator (VERA-CS) was used to
successfully simulate and provide high fidelity solutions to quantify the uncertainty in
predicting the onset of Chalk River Unidentified Deposits (CRUD) growth and therefore
allowed for more optimal operating conditions for current U.S. reactors. In 2017, CASL will
use VERA-CS coupled to Shift, a Monte Carlo neutronics solver, to verify and validate the
gamma heating distribution for a wide variety of operational states and accident
conditions. These calculations will allow for determining the errors in the lower-order
approximations used in VERA-CS and will enable predictive simulation of these operational
states and accident conditions. Along with this analysis, CASL will also perform highfidelity
vessel fluence calculations using excore modeling with Shift and VERA-CS.
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