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|Title:||Support to the identification of anomalies in an external neutron source using Hurst Exponents.|
|Title of periodic:||Progress in Nuclear Energy|
|Authors:||Henrice JR, Edson|
Palma, Daniel, A. P
Gonçalves, Alessandro C
Mesquita, Amir Zacarias
|Affiliation:||Universidade Federal do Rio de Janeiro, RJ, Brasil.|
Comissão Nacional de Energia Nuclear, Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro, RJ, Brasil.
Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil.
|Keywords:||Neutron flux;fractional diffusion;fractional derivative;Spurious beam|
|Abstract:||A new methodology is proposed here to identify anomalies in the neutron flux as a result neutron production trips in an Accelerator Driven System - ADS type reactor. This methodology is based on the calculation of Hurst exponents, where the neutron flux as monitored in the reactor core is treated as a temporal series. In several recent articles, related to fractional diffusion, the Hurst exponent is used as an estimate for the order of the fractional derivative. Our object of study considered a reactor based on the Myrrha simulated with the Serpent Monte Carlo code for two kinds of trips occurred in the production of neutrons, as follows: a Peak of Production (PP), the Unprotected* Accelerator Beam Overpower (UABO), and the spurious Beam Trip (BT). In order to estimate the Hurst exponent it was used two different methods, namely the Rescaled Range Analysis (R/S) and the Detrended Fluctuation Analysis Method (DFA). The results obtained showed that the R/S methodology had some advantages in a comparison with the DFA in indicating the occurrence of those anomalies. Also being able to provide a scale for the assessment of the intensity of the trip occurred, showing to be an useful tool to support anomaly identification in the neutron flux of ADS reactors.|
|Appears in Collections:||Artigo de periódico|
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