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Validation of a time-dependent deterministic model for neutron noise on the first CROCUS experimental measurements

Authors: A. Brighenti; S. Santandrea; I. Zmijarevic; Z. Stankovski;

Validation of a time-dependent deterministic model for neutron noise on the first CROCUS experimental measurements

Abstract

In the framework of the European project CORTEX, included in the H2020 program, the experimental campaign carried out with the CROCUS reactor, at the École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland, aims at setting up methodologies and tools for the analysis and the interpretation of neutron noise in view of their industrial applications. An important part of the CORTEX project deals with code development and validation. In this paper, a new methodology for the simulation of neutron noise has been formulated and implemented in the APOLLO3 code. The method is based on an improved point-kinetics model employed in a fully heterogeneous 2D transport calculation. In this work, the theoretical derivation and the successive validation of the model are presented, comparing the Cross-Power Spectral Densities (CPSD) of measured and computed detector responses. Future work will consist in extending the application of the method to the analysis of 3D configurations, in particular for full reactor studies.

Keywords

NEUTRON NOISE, POINT KINETICS, TRANSPORT CODE, CROCUS, VALIDATION

17 references, page 1 of 2

[1] V. Lamirand, A. Rais, S. Hübner, C. Lange, J. Pohlus, U. Paquee, C. Pohl, O. Pakari, P. Frajtag, D. Godat, M. Hursin, A. Laureau, G. Perret, C. Fiorina and A. Pautz, "Neutron noise experiments in the AKR-2 and CROCUS reactors for the European project CORTEX," ANIMMA 2019, EPJ Web of Conferences 225, 04023 (2020), 2019, https://doi.org/10.1051/epjconf/202022504023.

[2] O. Pakari, V. Lamirand, G. Perret, L. Braun, P. Frajtag and A. Pautz, " Current Mode Neutron Noise Measurements in the Zero Power Reactor CROCUS," EPJ Web of Conferences, vol. 170, p. 2018. [OpenAIRE]

[3] A. G. Mylonakis, C. Demazière, P. Vinai, V. Lamirand, A. Rais, O. Pakari, P. Frajtag, D. Godat, M. Hursin, G. Perret, A. Laureau, C. Fiorina and A. Pautz, "CORE SIM+ simulations of COLIBRI fuel rods oscillation experiments and comparison with measurements," in PHYSOR 2020: Transition to a Scalable Nuclear Future, Cambridge, United Kingdom, March 29th-April 2nd, 2020. [OpenAIRE]

[4] V. Lamirand, P. Frajtag, D. Godat, M. Hursin, G. Perret, O. Pakari, A. Rais, C. Fiorina and A. Pautz, "The COLIBRI programme in CROCUS : characterisation of the fuel rods oscillator," ANIMMA 20199, EPJ Web of Conferences 225, 04020 (2020), 2019, https://doi.org/10.1051/epjconf/202022504020.

[5] S. Santandrea, D. Sciannandrone, R. Sanchez, L. Mao and L. Graziano, "A Neutron Transport Characteristics Method for 3D Axially Extruded Geometries Coupled with a Fine Group SelfShielding Environment," Nuc. Sci. Eng., vol. 186, no. 3, pp. 239-276, 2017.

[6] V. Lamirand, M. Hursin, A. Rais, S. Hubner, C. Lange, J. Pohlus, U. Paquee, C. Pohl, O. Pkari and A. Laureau, "Experimental Report of the 1st campaign at AKR-2 and CROCUS," CORTEX - D2.1, 03 Dec. 2018.

[7] V. Lamirand, Private communications, 31 Jan. 2020.

[8] V. Lamirand, A. Rais, O. Pakari, M. Hursin, A. Laureau, J. Pohlus, U. Paquee, C. Pohl, S. Hubner, C. Lange, P. Frajtag, D. Godat, G. Perret, C. Fiorina and A. Pautz, "Analysis of the first COLIBRI neutron noise campaign in the CROCUS reactor for the European project CORTEX," in PHYSOR2020: Transition to a Scalable Nuclear Future, Cambridge, United Kingdom, March 29thApril 2nd, 2020.

[9] S. Santandrea, L. Graziano and D. Sciannandrone, "Accelerated polynomial axial expansion for full 3D neutron transport MOC in APOLLO3® code system as applied to the ASTRID fast breeder reactor," Ann. Nuc. Energy, vol. 113, pp. 194-236, 2018, https://doi.org/10.1016/j.anucene.2017.11.010. [OpenAIRE]

[10] S. Santandrea, L. Graziano, I. Zmijarevic and B. Vezzoni, "A Leakage synthetic algorithm and a Krylov approach for thermal iterations in APOLLO3 code in support to industrial applications," submitted to ANS M&C 2021 Conference.

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