Flashing-induced density wave oscillations in a natural circulation BWR—mechanism of instability and stability map

Furuya, Masahiro; Inada, Fumio; Hagen, T.H.J.J. van der

doi:10.1016/j.nucengdes.2005.01.006

Cited by 91 publications

(45 citation statements)

References 7 publications

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“…The flow conditions were, however, stable for all parameter ranges listed in Table 2. It can be concluded from this and the results of previous investigations 5,6) that the representative natural-circulation BWR can be started up with a sufficient stability margin.…”

Section: Stability Estimation Of Rated Operating Conditionssupporting

confidence: 62%

“…Finally, it can be concluded from the results of present and previous investigations [5][6][7] that the representative natural-circulation BWR can be started up with a sufficient stability margin.…”

Section: )mentioning

confidence: 50%

“…The representative natural-circulation BWR is started up at a low power density until the pressure reaches 6.8 MPa, to avoid flashing-induced density wave oscillations at relatively low pressures 5) and Type-I density wave oscillations at relatively high pressures. 6) Meanwhile the effect of void-reactivity feedback is negligible, since the void fraction in the core is small.…”

Section: Stability Estimation Of Rated Operating Conditionsmentioning

confidence: 99%

“…Previously, the authors examined thermal-hydraulic stability of the natural-circulation BWR with the SIRIUS-N facility, by neglecting the void-reactivity feedback. As a result of the experiment, we found two different types of oscillations: flashing-induced density wave oscillations at relatively low pressures 5) and Type-I density wave oscillations at relatively high pressures, 6) and investigated the conditions and mechanisms of occurrence of these instabilities. 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.…”

Section: Introductionmentioning

confidence: 98%

“…The thermal-hydraulic stability characteristics of natural circulation with a chimney are described in references. 5,6,8,9) II. Design Concept of BWR Stability Facility, SIR-IUS-N 1.…”

Section: Introductionmentioning

confidence: 99%

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Regional Stability Estimation of Natural Circulation BWRs using SIRIUS-N Facility

Furuya

Inada

Hagen

2005

J. Nucl. Sci. Technol.

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The SIRIUS-N facility was designed and constructed for highly accurate simulation of core-wide and regional instabilities of the BWR. A real-time simulation was performed in the digital controller for heat conduction in a fuel-rod and modal point kinetics of reactor neutronics using measured void fractions in reactor core sections of the thermalhydraulic loop. In order to estimate decay ratios, an auto-regressive method has been successfully applied for time series data of the core inlet flow rate. Experiments were conducted with the SIRIUS-N facility for the rated operating condition of 3.13 GWt natural circulation BWR. Channel and regional stability decay ratios were determined to be 0.38 and 0.54, respectively, which indicates sufficient margin for the instabilities. Experiments were extended to evaluate the stability sensitivity of design parameters such as the power profile, void reactivity coefficients, core inlet subcooling, and the fuel rod time constant.

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Section: Stability Estimation Of Rated Operating Conditionssupporting

confidence: 62%

Section: )mentioning

confidence: 50%

Section: Stability Estimation Of Rated Operating Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

“…The thermal-hydraulic stability characteristics of natural circulation with a chimney are described in references. 5,6,8,9) II. Design Concept of BWR Stability Facility, SIR-IUS-N 1.…”

Section: Introductionmentioning

confidence: 99%

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