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Impact on the Sustainable Development Goals (SDGs)

Analysis of institutional authors

Montalvo, CCorresponding AuthorGarcia-Berrocal, AAuthorTorres, LaAuthor

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December 18, 2020
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Resolving mode mixing in boiling water reactors instability analysis using variational mode decomposition

Publicated to: INTERNATIONAL JOURNAL OF ENERGY RESEARCH. 45 (4): 6067-6085 - 2021-03-25 45(4), DOI: 10.1002/er.6228

Authors:

Montalvo, C; Gavilán, CJ; Garcia-Berrocal, A; Torres, LA
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Affiliations

Iberdrola SA, Cofrentes NPP, Valencia, Spain - Author
Univ Politecn Madrid UPM, Energy & Fuels Dept, Rios Rosas 21, Madrid 28003, Spain - Author

Abstract

In dynamic, complex and nonlinear systems, the analysis of transients, instabilities or unusual events is fundamental, as well as the knowledge of the system's behavior in the frequency space. What is usual in this type of study is to have discrete and digitally acquired data, due to a sampling process with a determined period or frequency. Extracting information from this data set is done by numerical methods, such as the Fourier Transform (FFT), the Hilbert-Huang Transform (HHT) or techniques from chaos mathematics (Attractors). In this way we have scarce data, with some loss of information, analyzed with numerical techniques that introduce, also, some dilution of the information. In particular, the techniques of analysis in the frequency space, by their very nature, blur, frequencies and bandwidths. This leads in some cases to the identification of unsuitable or very wide frequencies or intervals, which make the extracted information unusable. To this effect, we have studied the VMD technique that provides more real and representative frequencies of the system as well as narrower bandwidths that make possible better identification of phenomena and influences. This technique has been applied to the analysis of thermohydraulic instabilities in nuclear boiling water reactors (BWR). The cases had already been analyzed with STFT and HHT techniques. The results of the application of the VMD shows that the mode mixing is solved, so modes obtained are monofrequency and these frequency bands are narrower than in previous methodologies. This improved performance allows using backbone plots for identifying which modes are excited in instabilities events.
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Keywords

BandwidthBoiling water reactorsClean water and sanitationDecay ratio estimationEventExponentExtracting informationHhtHilbert huang transformsInstabilityInstability analysisMathematical transformationsMixingMode decompositionNumerical methodsNumerical techniquesOf-phase oscillationsSampling processStabilityTechniques of analysisThermo-hydraulicTransientVmdWavelet

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal INTERNATIONAL JOURNAL OF ENERGY RESEARCH due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2021, it was in position 1/34, thus managing to position itself as a Q1 (Primer Cuartil), in the category Nuclear Science & Technology. Notably, the journal is positioned above the 90th percentile.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2026-04-25:

  • WoS: 4
  • Scopus: 4
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Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2026-04-25:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 2 (PlumX).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: https://oa.upm.es/93217/

As a result of the publication of the work in the institutional repository, statistical usage data has been obtained that reflects its impact. In terms of dissemination, we can state that, as of

  • Views: 33
  • Downloads: 7
Continuing with the social impact of the work, it is important to emphasize that, due to its content, it can be assigned to the area of interest of ODS 6 - Clean water and sanitation, with a probability of 86% according to the mBERT algorithm developed by Aurora University.
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Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (MONTALVO MARTIN, CRISTINA) and Last Author (TORRES DELGADO, LUIS ALEJANDRO).

the author responsible for correspondence tasks has been MONTALVO MARTIN, CRISTINA.

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Project objectives

Los objetivos perseguidos en esta aportación se centran en mejorar el análisis de inestabilidades en reactores nucleares de agua en ebullición mediante técnicas avanzadas de descomposición modal. Se pretende analizar la capacidad de la técnica de Variational Mode Decomposition (VMD) para resolver el problema de mezcla de modos en datos discretos y digitalizados. Se busca evaluar la precisión de VMD en la identificación de frecuencias reales y representativas del sistema, con bandas de frecuencia más estrechas que las obtenidas por técnicas previas como STFT y HHT. Además, se aspira a determinar la aplicabilidad de VMD en el estudio de inestabilidades termohidráulicas en BWR y caracterizar la mejora en la identificación de modos excitados durante eventos inestables mediante gráficos de backbone.
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Most relevant results

El estudio aborda la mejora en el análisis de inestabilidades termohidráulicas en reactores nucleares de agua en ebullición mediante la técnica de descomposición modal variacional (VMD). Los resultados más relevantes son: la técnica VMD resuelve el problema de mezcla de modos, obteniendo modos monofrecuencia; las bandas de frecuencia identificadas son más estrechas que las obtenidas con STFT y HHT; se logra una representación más real y representativa de las frecuencias del sistema; la reducción en el ancho de banda facilita una mejor identificación de fenómenos e influencias; y se posibilita el uso de gráficos backbone para determinar los modos excitados durante eventos de inestabilidad.
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