Development of SIRIUS-N facility with simulated void-reactivity feedback to investigate regional and core-wide stability of natural circulation BWRs

Masahiro Furuya, F. Inada, T. H.J.J. Van Der Hagen

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The SIRIUS-N facility was designed and constructed for highly accurate simulation of core-wide and regional instabilities of a natural circulation BWR. A real-time simulation was performed in the digital controller for modal point kinetics of reactor neutronics and fuel-rod conduction on the basis of measured void fractions in reactor core sections of the thermal-hydraulic loop. Stability experiments were conducted for a wide range of thermal-hydraulic conditions, power distributions, and fuel rod time constants, including the nominal operating conditions of a typical natural circulation BWR. The results show that there is a sufficiently wide stability margin under nominal operating conditions, even when void-reactivity feedback is taken into account. The stability experiments were extended to include a hypothetical parameter range (double-void reactivity coefficient and inlet core subcooling increased by a factor of 3.6) in order to identify instability phenomena. The regional instability was clearly demonstrated with the SIRIUS-N facility, when the fuel rod time constant matches the oscillation period of density wave oscillations.

Original languageEnglish
Pages (from-to)1635-1649
Number of pages15
JournalNuclear Engineering and Design
Volume235
Issue number15
DOIs
Publication statusPublished - 2005 Jul 1
Externally publishedYes

Fingerprint

void
voids
reactivity
Feedback
oscillation
hydraulics
rods
time constant
simulation
experiment
Hydraulics
reactor cores
kinetics
oscillations
Reactor cores
Void fraction
margins
controllers
Experiments
reactors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Mechanical Engineering

Cite this

Development of SIRIUS-N facility with simulated void-reactivity feedback to investigate regional and core-wide stability of natural circulation BWRs. / Furuya, Masahiro; Inada, F.; Van Der Hagen, T. H.J.J.

In: Nuclear Engineering and Design, Vol. 235, No. 15, 01.07.2005, p. 1635-1649.

Research output: Contribution to journalArticle

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