Serpent/SUBCHANFLOW Coupled Calculations for a VVER Core at Hot Full Power

Diego Ferraro (Corresponding author), Manuel Garcia, Uwe Imke, Ville Valtavirta, Riku Tuominen, Yuri Bilodid, Jaakko Leppänen, Sanchez-Espinoza Victor

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)


An increasing interest on the development of highly accurate methodologies in reactor physics is nowadays observed, mainly stimulated by the availability of vast computational resources. As a result, an on-going development of a wide range of coupled calculation tools is observed within diverse projects worldwide. Under this framework, the McSAFE European Union project is a coordinated effort aimed to develop multiphysics tools based on Monte Carlo neutron transport and subchannel thermal-hydraulics codes. These tools are aimed to be suitable for high-fidelity calculations both for PWR and VVER reactors, with the final goal of performing pin-by-pin coupled calculations at full core scope including burnup. Several intermediate steps are to be analyzed in-depth before jumping into this final goal in order to provide insights and to identify resources requirements. As part of this process, this work presents the results for a pin-by-pin coupling calculation using the Serpent 2 code (developed by VTT, Finland) and the subchannel code SUBCHANFLOW (SCF, developed by KIT, Germany) for a full-core VVER model. For such purpose, a recently refurbished master-slave coupling scheme is used within a High Performance Computing architecture. A full-core benchmark for a VVER-1000 that provides experimental data is considered, where the first burnup step (i.e. fresh core at hot-full rated power state) is calculated. For such purpose a detailed (i.e. pin-by-pin) coupled Serpent-SCF model is developed, including a simplified equilibrium xenon distribution (i.e. by fuel assembly). Comparisons with main global reported results are presented and briefly discussed, together with a raw estimation of resources requirements and a brief demonstration of the inherent capabilities of the proposed approach. The results presented here provide valuable insights and pave the way to tackle the final goals of the on-going high-fidelity project.
Original languageEnglish
Title of host publicationPHYSOR 2020 - International Conference on Physics of Reactors
Subtitle of host publicationTransition to a Scalable Nuclear Future
EditorsMarat Margulis, Partrick Blaise
PublisherEDP Sciences
ISBN (Print)978-1-5272-6447-2
Publication statusPublished - 2020
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Physics of Reactors, PHYSOR 2020: Transition to a Scalable Nuclear Future - Cambridge, United Kingdom
Duration: 28 Mar 20202 Apr 2020

Publication series

SeriesEPJ Web of Conferences


ConferenceInternational Conference on Physics of Reactors, PHYSOR 2020
Country/TerritoryUnited Kingdom


This work was done within the McSAFE project, which is receiving funding from the Euratom research and training programme 2014-2018 under grant agreement No 755097.


  • Code coupling
  • Full-core VVER
  • HIgh-fidelity
  • SCF
  • Serpent


Dive into the research topics of 'Serpent/SUBCHANFLOW Coupled Calculations for a VVER Core at Hot Full Power'. Together they form a unique fingerprint.

Cite this