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X2 VVER-1000 benchmark revision: fresh HZP core state and the reference Monte Carlo solution

Bilodid, Y.; Fridman, E.; Lötsch, T.

The X2 VVER-1000 benchmark provides a unique set of VVER-1000 plant data: the detailed core definition, operational history of the first four fuel cycles and various measurement results. This paper presents the second revision of the benchmark specification with significant improvements such as detailed reflector definition, corrected material compositions, clear illustrations etc. The reference solution for the hot zero power experiments conducted during the fresh core start-up was obtained with the Serpent-2 Monte Carlo code. The calculated and measured values of a critical boron concentration, temperature reactivity effect, and control rod worth are in a very good agreement while the deviations lay within the measurement uncertainties. Further extension of the benchmark definition is foreseen for a future work.

Keywords: X2 benchmark; VVER-1000; Serpent

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Permalink: https://www.hzdr.de/publications/Publ-29992
Publ.-Id: 29992