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Analysis methods for the determination of possible unseated fuel assemblies in BWRs

Christophe Demazière (Institutionen för teknisk fysik, Nukleär teknik)
International Journal of Nuclear Energy Science and Technology, (1741-6361). Vol. 2 (2006), 3, p. 167-188.
[Artikel, refereegranskad vetenskaplig]

This paper describes noise-based methods, the purpose of which is to determine whether the core of a Boiling Water Reactor (BWR) contains unseated fuel assembly(ies) or not. The characteristic feature of an unseated fuel assembly is to render the corresponding fuel channel thermal-hydraulically unstable since some of the coolant bypasses the fuel channel. The induced neutron noise has a strong space-dependence due to the localized character of the perturbation. Several techniques relying on the analysis of the spatial structure of the in-core neutron noise can thus be used to determine whether the induced neutron noise might correspond to unseated fuel assembly(ies). These techniques rely on time-domain and frequency-domain analysis. This paper presents in all cases expected spatial signatures determined from calculations, and compares these theoretical findings to two practical examples, where noise measurements were carried out: a local instability event, and a global oscillation coexisting with a regional oscillation.

Nyckelord: neutron noise analysis, Boiling Water Reactor (BWR), stability, Decay Ratio (DR), space-dependence, core calculations, noise measurement



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Denna post skapades 2007-01-15. Senast ändrad 2015-09-01.
CPL Pubid: 25514

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)

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Energi
Annan fysik

Chalmers infrastruktur