Papers by Pierre-Etienne Labeau
Proceeding of the 33rd European Safety and Reliability Conference
In a power system featuring a large share of distributed generations (DGs), the variability of po... more In a power system featuring a large share of distributed generations (DGs), the variability of power supply results in various issues in the implementation of more DG units incorporation to the existing distribution networks, particularly, congestion risk. Active Network Management (ANM) could provide (almost) real-time control, by possibly curtailing their production in case of grid congestion so as to allow more DG units integration, while deferring costly and time-consuming network upgrades. This paper provides a methodology for the fast assessment of the connection capability of DG units to a grid in ANM scheme, based on efficient Monte Carlo sampling. Besides, resorting to correlated sampling, it is possible to simultaneously estimate the congestion risk with and without connecting a new DG unit of variable capacity. This significantly reduces the computation burden in assessing the connection capability of a grid. The effectiveness of the proposed method is demonstrated on a test power grid.
Reliability of a multi-state system subject to shocks using phase-type distributions
Applied Mathematical Modelling, Apr 1, 2013
ABSTRACT The reliability of a multi-state system is considered. The system is subject to both int... more ABSTRACT The reliability of a multi-state system is considered. The system is subject to both internal wear-out and external shocks causing damage that cumulates as shocks follow one another. As a consequence of this cumulating damage, the system wear-out process can be affected.The study of the system is achieved by means of phase-type distributions, which are used to model: the inter-arrival times between shocks, the magnitude of the damage due to the shocks, and the lifetime distribution of the system between shocks. In the latter case, the phases of the phase-type distribution refer to the different degradation levels (‘states’) of the system.The lifetime distribution of the system is affected by the shocks in different ways: if the cumulated damage after a shock exceeds q predefined thresholds, the system can no longer evolve in the first q least degraded levels; the corresponding phase-type distribution is then defined on the remaining phases. But after each shock causing no threshold to be exceeded, only the initial probability vector of the phase-type distribution is modified in order to account for a decrease in the expected residual lifetime of the system.Two particular cases are studied. First, several thresholds on the cumulated damage can be exceeded following the occurrence of one shock; secondly, only one threshold at a time can be exceeded.
Applied Stochastic Models in Business and Industry, 2004
Most maintenance policies assume that failed or used components are replaced with identical units... more Most maintenance policies assume that failed or used components are replaced with identical units. Actually, such a hypothesis neglects the possible obsolescence of the components. When a new, more reliable and less consuming technology becomes available, a decision has to be made as for the replacement strategy to be used: old-type components can all be immediately replaced, or new-type units can be introduced progressively, each time a corrective action is undertaken. Partly corrective, partly preventive policies can also be envisioned. This work tackles this issue in the case of a series system made of n identical and independent components with a constant failure rate. It provides, under given modelling assumptions, the fully analytical expression of the mean total cost induced by each possible strategy, as well as the optimal replacement policy, as a function of the problem parameters. This is performed by accounting for different costs for preventive or corrective replacements, with some economical dependence between replacements, different energy consumption rates for old-type and new-type components as well as a discount rate.
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, Mar 1, 2020
In this paper we present the results of a detector response function modeling using a new version... more In this paper we present the results of a detector response function modeling using a new version of PHITS Particle and Heavy Ion Transport Code with an advanced feature for asymmetrical peak broadening. Tests are performed on a room temperature medium resolution 500 mm 3 CdZnTe detector of a quasi-hemispherical design with validation on a set of point source gamma-ray spectra with a range of energies from 59 keV up to 1332 keV. Performance assessment is conducted with respect to built-in spectra broadening capabilities using as default Gaussian as well as an asymmetrical peak shape models. Results of our study indicate that up to 200 keV energy range where peak asymmetry is not severe a default Gaussian peak shape broadening can be used. Beyond 200 keV the degree of CZT photopeak asymmetry becomes significant and requires an asymmetrical peak shape broadening. This asymmetry affects the low-energy side of the photopeaks and has a non-linear behavior with energy. We find that with a built-in feature of a tailed peak shape model introduced in the new version of PHITS code (ver. 3.10) asymmetrical peak shapes of CZT detectors can be approximated. The analysis routines and mathematical formalism are described in detail and results are presented.
A Transport Framework for Zero-Variance Monte Carlo Estimation of Markovian Unreliability
Markovian modelling is a widespread framework to solve PRA problems [1, 2]. Though this assumptio... more Markovian modelling is a widespread framework to solve PRA problems [1, 2]. Though this assumption implies that the system is memoryless and thus that a large number of circumstances cannot be modelled in this fashion, addition of supplementary variables [3] or of physical variables [4] allows to handle a much wider range of applications than those satisfying stricto senso the Markovian hypothesis. The drawback of this simple modelling is the large number of states that have to be considered in a realistic application, and thereby the size of the system to solve. Monte Carlo simulation [5, 6] appears to be a practicable way to circumvent this problem.
A semi-analytical approach to the solution of event sequence diagrams
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Dynamic Reliability: Future Directions, Proceedings of the fourth workshop on dynamic reliability
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A model of imperfect preventive maintenance efficiency based on the concepts of elasticity and effective age
CRC Press eBooks, Aug 20, 2009
Probabilistic Risk Analysis of the Geological Disposal of Highly Radioactive Waste
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Nuclear Science and Engineering, Jun 1, 2005
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Assessment of the grid-related loss of offsite power to the nuclear power plants in the presence of wind farms
Progress in Nuclear Energy
Accident sequence simulation methods based on dynamic reliability concepts
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Nuclear data uncertainty propagation and uncertainty quantification in nuclear codes
Modeling of the maintenance policy of an offshore wind farm
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Ce travail s’inscrit dans le cadre d’etude de la surete de fonctionnement.La surete de fonctionne... more Ce travail s’inscrit dans le cadre d’etude de la surete de fonctionnement.La surete de fonctionnement est progressivement devenue partie integrante de l’evaluation des performances des systemes industriels. En effet, les pannes d’equipements, les pertes de production consecutives, et la maintenance des installations ont un impact economique majeur dans les entreprises. Il est donc essentiel pour un manager de pouvoir estimer de maniere coherente et realiste les couts de fonctionnement de l’entreprise, en tenant notamment compte des caracteristiques fiabilistes des equipements utilises, ainsi que des couts induits entre autres par le non-fonctionnement du systeme et la restauration des performances de ses composants apres defaillance.Le travail que nous avons realise dans le cadre de ce doctorat se concentre sur un aspect particulier de la surete de fonctionnement, a savoir les politiques de remplacement d’equipements basees sur la fiabilite des systemes qu’ils constituent. La recher...
Annals of Nuclear Energy, 2017
It aims to provide evidence-based scientific support to the European policy-making process. The s... more It aims to provide evidence-based scientific support to the European policy-making process. The scientific output expressed does not imply a policy position of the European Commission. Neither the European Commission nor any person acting on behalf of the Commission is responsible for the use which might be made of this publication. All images © European Union 20xx, except: xxx (photo credits list) JRC97798 EUR27507 EN
Risk perception and cultural theory: Criticism and methodological orientation
Safety, Reliability and Risk Analysis, 2008
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Modélisation des stratégies de remplacement de composant et de systèmes soumis à l'obsolescence t... more Modélisation des stratégies de remplacement de composant et de systèmes soumis à l'obsolescence technologique (Unpublished doctoral dissertation). Université libre de Bruxelles, Faculté des sciences appliquées-Physique, Bruxelles.
Théorie culturaliste et perception des risques: une analyse critique
... A partir des années quatre-vingt-dix, de nombreux psychologues et sociologues ont procédé à d... more ... A partir des années quatre-vingt-dix, de nombreux psychologues et sociologues ont procédé à des tentatives de validation empirique de la théorie culturaliste : il s'agit essentiellement de Karl Dake et d'Aaron Wildavsky [13, 14, 15], suivis, entre autres par Marris [16 ... [3] Vlek C. et ...
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Papers by Pierre-Etienne Labeau