Monte carlo analysis of SNEAK-12A core disruption in liquid-metal fast breeder reactors - The path for innovative severe accident studies in ZPR

M. Margulis, E. Gilad, P. Blaise

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

Abstract

The field of recriticality possibilities in both light water reactors and fast reactors remains an important area of R&D, and in particular from the neutronics point of view. Future experimental programs to be implemented in forthcoming zero power experimental facilities should be able to deal with enhanced capabilities for simulating sequences of severe accidents, leading to significant structural damages, and their impact on power excursion and possible reciticality. However, existing programs have been realized, but not fully intepreted at the time. A new computational benchmark is here introduced based on the SNEAK-12A critical assembly experiments. These experiments studied the reactivity effects of different core disruptions in LMFBRs due to severe accident which results in core degradation, i.e. fuel meltdown and materials relocation in the core. The different stages of the core damage progression during a severe accident were modeled by a series of representative core configurations. These configurations are calculated using advanced Monte Carlo codes such as TRIPOLI and Serpent, and include effective multiplication factor, flux and reaction rates distribution and energy spectrum. The calculated results are compared to the experimental values and show good to very good agreement for reactivity effects. Additional quantities have been modeled, such as fissile detectors positioned in various core areas. The study demonstrates that they behave differently during the accidental sequence, hence opening new possibilities for core monitoring. The ultimate goal of the present study is to prepare a more comprehensive benchmark to be shared within an international context, as to enlarge a future experimental database for both light water and fast reactors, taking profit from innovative modeling and experimental capabilities.

Original languageEnglish
Title of host publicationPhysics of Reactors 2016, PHYSOR 2016
Subtitle of host publicationUnifying Theory and Experiments in the 21st Century
PublisherAmerican Nuclear Society
Pages1893-1905
Number of pages13
ISBN (Electronic)9781510825734
StatePublished - 1 Jan 2016
Externally publishedYes
EventPhysics of Reactors 2016: Unifying Theory and Experiments in the 21st Century, PHYSOR 2016 - Sun Valley, United States
Duration: 1 May 20165 May 2016

Publication series

NamePhysics of Reactors 2016, PHYSOR 2016: Unifying Theory and Experiments in the 21st Century
Volume3

Conference

ConferencePhysics of Reactors 2016: Unifying Theory and Experiments in the 21st Century, PHYSOR 2016
Country/TerritoryUnited States
CitySun Valley
Period1/05/165/05/16

Keywords

  • Benchmarking
  • FBR
  • Monte Carlo
  • Recriticality
  • SNEAK-12
  • Severe accidents

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