Core stability in operating BWR: operational experience

Gialdi, E.; Grifoni, S.; Parmeggiani, C.; Tricoli, C.

doi:10.1016/0149-1970(85)90070-8

Cited by 53 publications

(14 citation statements)

References 3 publications

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“…This mode oscillation in BWRs is a spatially dependent phenomenon (Takeuchi 1994). Such phenomenon has been reported in several studies, such as: Caorso (Gialdi et al, 1985), Cofrentes (Mata et al, 1992), and Ringhals 1 (Hotta et al 2000).…”

Section: Introductionmentioning

confidence: 93%

BWR Parametric Sensitivity Effect of Regional Mode Instability on Stability Boundary

Hsieh

Lin

Wang

et al. 2008

JPES

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Both in-phase (core wide mode) instability and out-of-phase (regional mode) instability are of great concerns in BWR stability issues. Normally, decay ratios for regional mode oscillations are much less than those under core wide conditions. However, under certain observation mode, the regional mode instability has the phenomenon of power increasing in one half of the core and at the same time, it decrease in the other half, so it looks like that the average power remains essentially constant. This research presents a study of fractional change of decay ratio to evaluate parametric effects of regional mode instability on reload core design power/flow stability boundary for the Chinshan Nuclear Power Plant Unit 2 Cycle 21 (BWR4). Making use of LAPUR5.2 and SIMULATE-3 codes, we have established a methodology to conduct such out-of-phase stability analysis. Many important parameters, such as system pressure, core flow rates, moderator void fraction, fuel physical and geometrical properties, have strong influences on regional mode stability. Current investigations have shown that at some operation points along the stability boundary, certain parameters present more sensitive characteristics.

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Section: Introductionmentioning

confidence: 93%

BWR Parametric Sensitivity Effect of Regional Mode Instability on Stability Boundary

Hsieh

Lin

Wang

et al. 2008

JPES

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“…( 5) ( 6) where a;q is the value of the parameter a at the Hopf bifurcation point and w 0 is w(a;q). and BIFOR2°> for the stability analysis using the bifurcation theory.…”

Section: Analysis Of Hopf Bifurcationmentioning

confidence: 99%

Stability Analysis of BWRs Using Bifurcation Theory.

Tsuji

NISHIO

Narita

et al. 1993

J. Nucl. Sci. Technol.

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This paper presents a new approach using the bifurcation theory for the stability analysis of BWRs. In this approach, the dependencies of the equilibrium states on the parameters that have a large influence on the stability are investigated topologically over a wide range of plrase space. The stability information can be derived from the analysis of the bifurcation phenomena on the equilibrium states. This investigation enabled us to obtain qualitative and global information on the stability of a nonlinear system. The new approach was applied to the analysis of the stability associated with in-phase power oscillation (core reactivity stability). The loss of linear stability took place at a lower reactor power as the coolant flow rate decreased, and this instability occurs at the Hopf bifurcation point. The sensitivity analysis of the stability boundary for the various parameters revealed that the channel hydrodynamics heavily play a significant role in the stability. The Hopf bifurcation analysis proved that the periodic state bifurcating at the Hopf bifurcation point was orbitally unstable and a limit cycle attractor did not exist in the vicinity of the bifurcation point. This fact led to the conclusion that a limit cycle in-phase power oscillation observed in BWR instability was not excited directly by the bifurcation of the orbitally unstable periodic state.

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“…First; BWRs can experience in-phase (core wide) or out-of-phase (regional) NCTH oscillations (March-Leuba and Blakeman, 1991). Second; some NCTH instabilities in operating reactor cores and in controlled experiments in BWRs have resulted in stable, finite amplitude oscillations (Farawila et al, 1996;Bergdahl et al, 1989;Gialdi et al, 1985), while others led to oscillations with growing amplitude, until stopped by automatic or manual scram (Kruners, 1998;Cheng et al, 1988). While in-phase and out-of-phase oscillations can be predicted by linear analysis using a detailed model of the core physics, analysis of the second phenomenon -which has received less attention in the past -necessarily requires the set of nonlinear equations either integrated numerically or studied using analytical bifurcation techniques.…”

Section: Introductionmentioning

confidence: 97%

Turning points and sub- and supercritical bifurcations in a simple BWR model

Rizwan-uddin

2006

Nuclear Engineering and Design

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Core stability in operating BWR: operational experience

Cited by 53 publications

References 3 publications

BWR Parametric Sensitivity Effect of Regional Mode Instability on Stability Boundary

BWR Parametric Sensitivity Effect of Regional Mode Instability on Stability Boundary

Stability Analysis of BWRs Using Bifurcation Theory.

Turning points and sub- and supercritical bifurcations in a simple BWR model

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