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MC21/CTF and VERA multiphysics solutions to VERA core physics benchmark progression problems 6 and 7
Daniel J. Kelly III,Ann E. Kelly,Brian N. Aviles,Andrew T. Godfrey,Robert K. Salko,Benjamin S. Collins 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.6
The continuous energy Monte Carlo neutron transport code, MC21, was coupled to the CTF subchannelthermal-hydraulics code using a combination of Consortium for Advanced Simulation of Light WaterReactors (CASL) tools and in-house Python scripts. An MC21/CTF solution for VERA Core PhysicsBenchmark Progression Problem 6 demonstrated good agreement with MC21/COBRA-IE and VERA solutions. The MC21/CTF solution for VERA Core Physics Benchmark Progression Problem 7, Watts Bar Unit1 at beginning of cycle hot full power equilibrium xenon conditions, is the first published coupled MonteCarlo neutronics/subchannel T-H solution for this problem. MC21/CTF predicted a critical boron concentrationof 854.5 ppm, yielding a critical eigenvalue of 0.99994 ± 6.8E-6 (95% confidence interval). Excellent agreement with a VERA solution of Problem 7 was also demonstrated for integral and localpower and temperature parameters.