'FULLCORE' and 'MIDICORE' VVER-1000 Benchmark Evaluations with Studsvik's CMS5-VVER Codes

Tamer Bahadir, Emiliya Georgieva (Studsvik)

28th Symposium of AER on VVER Reactor Physics and Reactor Safety (2018, Olomouc, Czechia)
Reactor physics experiments and code validation (benchmarks)

Abstract

Studsvik’s in-core fuel management system CMS5-VVER contains lattice physics code CASMO5-VVER and 3D, steady-state nodal code for the hexagonal geometry, SIMULATE5-VVER. The nodal solver of SIMULATE5 along with preliminary benchmarking activities were presented in last year’s AER meeting.

The first part of this paper outlines the calculation of pin-powers in SIMULATE5-VVER: Heterogeneous pin powers are calculated by modulating multi-group homogenous pin powers obtained from the nodal solver of SIMULATE5-VVER with pin form factors, typically in two-groups, from single-assembly CASMO5-VVER lattice calculations.

The second part of the paper demonstrates the accuracy of the nodal and pin power solutions obtained with CMS5-VVER for two numerical benchmarks that are well known in the AER community: the FULLCORE and MIDICORE VVER-1000 benchmarks. These benchmarks, developed by the Skoda JS a.s. group, model the realistic initial cores of a VVER-1000 reactor at cold state point in 2D dimensional geometry for which the reference solutions obtained with Monte Carlo codes MCNP6 and SERPENT: The core reactivity, assembly and pin-by-pin power distributions computed with CMS5-VVER are compared to the reference solutions.

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