Analysis of a Neutron Flux Oscillation Event at LaSalle-2

Araya, Fumimasa; Yoshida, Kazuo; Hirano, Masashi; Yabushita, Yukihisa

doi:10.13182/nt91-a34520

Cited by 17 publications

(2 citation statements)

References 6 publications

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“…Space-Dependent Theory of Nonlinear BWR Dynamics Numerical simulations in 3-D space, especially, the computer codes such as RETRAN (Araya et al, 1991), STANDY (Yokomizo et al, 1987;Muto et al, 1990), EPA (Wullf, 1992), TOSDYN (Tsunoyama et al, 1984;Takigawa et al, 1987;Takeuchi et al, 1991Takeuchi et al, , 1992aTakeuchi et al, , 1992bTakeuchi et al, , 1994aTakeuchi et al, , 1994b, RAMONA (Moberg et al, 1979) and LAPUR (Blakemann et al, 1989), have been performed to manifest the essential mechanism of core-wide (uniform or in-phase) and regional (out of phase) oscillations which have been observed in BWRs shown in Table III.…”

Section: Space-dependent Stochastic Dynamicsmentioning

confidence: 99%

Advances in Nuclear Science and Technology

2002

Advances in Nuclear Science and Technology

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PREFACEAs we close on the Millennium we also approach a half-century of nuclear power. The major peaceful application centres on the large-scale production of electricity but international politics in the last year has shown that we have not left the origins in nuclear weapons behind. Can we assess the future of nuclear technology in the coming century?Electricity remains the dominant role for nuclear technology, though we may recognise the valuable contributions of radio-isotope work to biology, agriculture, disease control, medical diagnostics and therapy in particular, with ramifications in most industries and civilised life. The supply of electricity from nuclear power remains of the order of 10% in the USA but rises to one-third in the UK and on to some 80% in France. Far Eastern countries still have a major construction program that might lead to them rivalling such figures. Indeed if we are to accept the majority judgement of scientists that global warming through, principally, carbon dioxide is a realistic threat, it is to be hoped that nuclear power will indeed be maintained and increased to balance the almost inevitable expansion of the use of coal by China in particular. Claims that countries such as Sweden will reduce CO2 emission and simultaneously reduce nuclear power seem but a chimera, lacking all technical credibility.The down-side remains, however. Not only is the world still threatened with nuclear weapons, by repute or even testing, but no country has had the political will to manage the disposal of radio-active wastes, not just the Achilles heel but the foot, shin and leg of nuclear power. Many scientists and engineers will suppose that this is solely a political problem, claiming that the technical solutions are available. Unfortunately, it makes it no less a problem and renders the prospect of continued, let alone expanded nuclear power, no less vulnerable for being political. And who amongst the technicians is wise to say that the atavistic public perception of the threat of nuclear power is irrational when sabre rattling by emerging weapons powers echoes throughout the world?We see an interesting parallel in the modern development of genetically engineered plants and animals, to be compared with the last halfcentury of nuclear power. In the bright dawn of the post-war nuclear age, the public by-and-large accepted the claims made for the promise of the cheap production of electricity but have largely turned, or been turned by the media, against nuclear power. Do we see the same hubris mounting for those microbiologists who dismiss risks of genetic contamination of agriculture or dismiss the change in insurance attitudes when the threads of DNA predict our future like the threads of the Fates, those Spinners of the Years? Take note of the history of Nuclear Power and prepare for the backlash.If trust is to be restored in the civil use of nuclear power, rational and careful study must be made of its problems, and the results made available publicly, as instanced by the first article in this ...

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Section: Space-dependent Stochastic Dynamicsmentioning

confidence: 99%

Advances in Nuclear Science and Technology

2002

Advances in Nuclear Science and Technology

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“…( 8) The reactivities considered here are the external reactivity added by control rods, and the Doppler and void reactivity feedbacks. The total reactivity p r is evaluated on the basis of a certain critical condition as follows :…”

Section: Analysis Of Hopf Bifurcationmentioning

confidence: 99%

Stability Analysis of BWRs Using Bifurcation Theory

Tsuji

NISHIO

Narita

et al. 1993

Journal of Nuclear Science and Technology

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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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Nonlinear Stochastic Dynamics and Instability Theory

Konno

Advances in Nuclear Science and Technology

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Analysis of a Neutron Flux Oscillation Event at LaSalle-2

Cited by 17 publications

References 6 publications

Advances in Nuclear Science and Technology

Advances in Nuclear Science and Technology

Stability Analysis of BWRs Using Bifurcation Theory

Nonlinear Stochastic Dynamics and Instability Theory

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