Modeling noise experiments performed at AKR-2 and CROCUS zero-power reactors

Hursin, M.; Zoia, A.; Rouchon, A.; Brighenti, A.; Zmijarevic, I.; Santandrea, S.; Vinai, P.; Mylonakis, A.; Yi, H.; Demazière, C.; Lamirand, V.; Ambrozic, K.; Yamamoto, T.; Hübner, S.; Knospe, A.; Lange, C.; Yum, S.; Macian, R.; Vidal, A.; Ginestar, D.; Verdú, G.

doi:10.1016/j.anucene.2023.110066

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…By employing RMC3.5, simulation models for the 3 He proportional counter and the KUCA facility [18] are established, as shown in Figure 3. The sequence data of neutron pulses generated from nuclear reactions between neutrons and 3 He gas 3 He(n, p)T within the detector are recorded and saved in ASCII format for subsequent processing [19][20][21].…”

Section: Numerical Simulation Of the Kuca Facility Based On Rmc35mentioning

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: Numerical Simulation Of the Kuca Facility Based On Rmc35mentioning

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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“…It required the development, qualification and licensing of a unique in-core device for fuel displacement [18]- [20]. It aims at the validation of the noise simulation codes, and was used in particular in three experimental campaigns [21]- [26] within the framework of the Horizon2020 project CORTEX [27]- [29].…”

Section: A Colibri: Fuel Rods Displacement and Oscillationmentioning

confidence: 99%

Ten springs of experiments in CROCUS

Lamirand

2023

EPJ Web Conf.

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Around a decade ago, a new team rebuilt experimental research at EPFL’s nuclear facilities, and in particular in the CROCUS nuclear reactor. After a broad investigation and open discussions with colleagues from the nuclear community, a number of experiments and research directions were selected. They range from reactor physics to nuclear data, with a focus on instrumentation. We present here the variety of experiments carried out and how instrumentation has been instrumental in these perspectives. Developments on branching or intrinsic reactor noise were made possible thanks to extensive theoretical investigation coupled with the developments of pulse and current modes neutron detection systems, as well as the LEAF gamma detection array. With regard to modulation or perturbation reactor noise, a study of fuel rods vibration was carried out thanks to the unique COLIBRI in-core fuel rods oscillation device; in the VOID experiments, a method was tested to measure the void coefficient with neutron modulation; in the APRHODITE project, the PISTIL rotating absorber, or absorber of variable strength, was used to determine the zero power reactor transfer function, in order to obtain feedback on kinetics nuclear data, particularly delayed neutrons. On the topic of nuclear data, the PETALE programme consisted on criticality and transmission experiments for the study of stainless steel, using instrumented metal reflectors. New dosimetry methodologies were developed for consistent and complete propagation of uncertainties, which also enabled experiments to be optimized. It will be continued in the HARVEST-X project, and its pile-oscillation program, BLOOM. Last but not least, developments in dosimetry as well as for a novel miniature neutron scintillation technology (MiMi detectors) allowed for interand intrapin (NECTAR) neutron measurements. 160 MiMi detectors have recently been distributed throughout the CROCUS core in a unique 3D detector array called SAFFRON, paving the way for novel high-resolution neutronics.

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