Autors: Mitkov S., Spasov, I. G., Kolev, N. P.
Title: Simulation of a hypothetical MSLB core transient in VVER-1000 with several stuck rods
Keywords: MSLB, RIA, coupled neutronic/thermal hydraulic calculation,

Abstract: A hypothetical main steam line break transient in a VVER-1000 core with multiple equipment faults was simulated with the coupled COBAYA4/CTF and COBAYA3/FLICA4 nodal core models. The objective was to test recent versions of the models developed in the EU NURISP and NURESAFE projects and to analyze the thermal-hydraulic conditions in the hot assembly at the pin-cell level. The accident scenario was specified as an aggravated variant of the OECD/NEA VVER-1000 MSLB benchmark with eight peripheral control rod clusters stuck out of the core after scram, all of them in the overcooled sector. Coarse-mesh models and a realistic cross-section library were used to compute the full-core behavior with pre-calculated MSLB boundary conditions and to identify the hot assembly. Then a sub-channel thermal-hydraulic analysis of the hot assembly was performed with the CTF code, using time-dependent assembly boundary conditions from the coarse-mesh vessel and core simulation.



    Kerntechnik, vol. 83, issue 4, pp. 389-395, 2018, Germany, Carl Hanser Verlag GmbH, ISSN 0932-3902

    Copyright Carl Hanser Verlag GmbH

    Вид: статия в списание, публикация в издание с импакт фактор, публикация в реферирано издание, индексирана в Scopus и Web of Science