Measurement of multiple  α -modes at the Delphi subcritical assembly by neutron noise techniques

Szieberth, M.; Klujber, G.; Kloosterman, Jan Leen; Haas, D.

doi:10.1016/j.anucene.2014.07.018

Cited by 20 publications

(3 citation statements)

References 18 publications

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“…The Rossi-alpha method [10,11] is a quintessential technique in the analysis of micronoise in nuclear reactors, particularly suited for measuring in delayed critical and subcritical states. Originating from Rossi's foundational work on the statistical laws of chain reactions in point reactor models, this method explores the signal output from neutron detectors within the reactor.…”

Section: Theory Of the Lhs-dmd-rossi-alpha Methods 21 The Rossi-alpha...mentioning

confidence: 99%

Research on the Measurement Method of the Prompt Neutron Decay Constant Based on LHS-DMD-Rossi-Alpha

Li,

Xie,

Deng

et al. 2024

Energies

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In response to the significant dependency on empirical judgment in measuring the prompt neutron decay constant with the traditional Rossi-alpha method and the issue of requiring an excessive number of detectors with the DMD-Rossi-alpha method, this paper introduces a calculation method for the prompt neutron decay constant based on a combination of Latin Hypercube Sampling (LHS), Dynamic Mode Decomposition (DMD), and the Rossi-alpha method. Initially, the method uses LHS to expand the sample dataset of neutron noise data to reduce the number of detectors required. It then employs the Rossi-alpha method to construct a Rossi-alpha distribution model from neutron noise data. Finally, it utilizes DMD for feature extraction from the Rossi-alpha distribution model, thereby determining the prompt neutron decay constant. Research findings demonstrate that, by simulating the KUCA facility using RMC3.5 in a near-critical state, the relative error of the α value calculated by the LHS-DMD-Rossi-alpha method model is 9% less than that calculated by the Rossi-alpha method. This approach, capable of enhancing the precision of measuring the prompt neutron decay constant with just a single detector, holds significant theoretical value and engineering significance for the advancement of reactor physics and experimental techniques.

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Section: Theory Of the Lhs-dmd-rossi-alpha Methods 21 The Rossi-alpha...mentioning

confidence: 99%

Research on the Measurement Method of the Prompt Neutron Decay Constant Based on LHS-DMD-Rossi-Alpha

Li,

Xie,

Deng

et al. 2024

Energies

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“…Noise experiments using isotopic neutron source which is Poisson in character have been carried out in different experimental facilities [4,5,6]. Various theoretical developments have also been carried out for pulsed and continuous neutron source under consideration of Poisson source characteristics [7,8,9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Noise experiments in BRAHMMA subcritical system using isotopic Poisson source and accelerator based neutron source

Ray

Kumar

Patel

et al. 2022

J. Phys.: Conf. Ser.

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Reactivity measurement using noise methods have been carried out in zero power subcritical system BRAHMMA, installed in BARC, India. During noise experiments, an Am-Be neutron source (1Ci) has been placed at the centre of the subcritical system. However, the proposed external neutron source in ADS, based on particle accelerator, is different from isotopic neutron source and the inherent fluctuations in beam current and accelerating voltage makes the source non-Poisson. In this context, Degweker and Rana had postulated a noise theory based on exponentially correlated Gaussian source characteristics for ADS. In noise experiments based on this postulate, a D-T neutron generator has been used in pulsed mode and source characterisation has been carried out to determine the distribution function, source correlation factor and D+ beam pulse shape. It has been observed that the source is Gaussian in nature, the source correlation factor is very large compared to the prompt neutron decay constant and the pulsed D+ beam is rectangular in shape. In noise experiments, the time stamped data have been analysed using various noise methods. The measured prompt neutron decay constant using Poisson source and correlated Gaussian source are in good agreement with theoretical value and amongst them.

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“…Over the years, universities around the world have introduced subcritical reactors as a capable teaching instrument for nuclear engineering [1][2][3][4][5][6][7]. Recently, the Jordan University of Science and Technology (JUST) introduced a subcritical reactor that is fueled with low-enriched uranium (LEU) oxide [4].…”

Section: Introductionmentioning

confidence: 99%

Neutrons and Gamma-Ray Dose Calculations in Subcritical Reactor Facility Using MCNP

Xoubi

2016

Atoms

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In nuclear experimental, training and teaching laboratories such as a subcritical reactor facility, huge measures of external radiation doses could be caused by neutron and gamma radiation. It becomes imperative to place the health and safety of staff and students in the reactor facility under proper scrutiny. The protection of these individuals against ionization radiation is facilitated by expected dose mapping and shielding calculations. A three-dimensional (3D) Monte Carlo model was developed to calculate the dose rate from neutrons and gamma, using the ANSI/ANS-6.1.1 and the ICRP-74 flux-to-dose conversion factors. Estimation for the dose was conducted across 39 areas located throughout the reactor hall of the facility and its training platform. It was found that the range of the dose rate magnitude is between 7.50 E´01 µSv/h and 1.96 E´04 µSv/h in normal operation mode. During reactor start-up/shut-down mode, it was observed that a large area of the facility can experience exposure to a significant radiation field. This field ranges from 2.99 E+03 µSv/h to 3.12 E+01 µSv/h. There exists no noticeable disparity between results using the ICRP-74 or ANSI/ANS-6.1.1 flux-to-dose rate conversion factors. It was found that the dose rate due to gamma rays is higher than that of neutrons.

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Measurement of multiple α -modes at the Delphi subcritical assembly by neutron noise techniques

Cited by 20 publications

References 18 publications

Research on the Measurement Method of the Prompt Neutron Decay Constant Based on LHS-DMD-Rossi-Alpha

Research on the Measurement Method of the Prompt Neutron Decay Constant Based on LHS-DMD-Rossi-Alpha

Noise experiments in BRAHMMA subcritical system using isotopic Poisson source and accelerator based neutron source

Neutrons and Gamma-Ray Dose Calculations in Subcritical Reactor Facility Using MCNP

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