The COLIBRI experimental program in the CROCUS reactor: characterization of the fuel rods oscillator

Author:

Lamirand Vincent,Frajtag Pavel,Godat Daniel,Pakari Oskari,Laureau Axel,Rais Adolfo,Hursin Mathieu,Hursin Grégory,Fiorina Carlo,Pautz Andreas

Abstract

The present article presents the mechanical characterization of the fuel rods oscillator developed for the purposes of the COLIBRI experimental program in CROCUS. COLIBRI aims at investigating the radiation noise related to fuel vibrations. The main motivation is the increased amplitudes in the neutron noise distributions recorded in ex- and in-core detectors that have been observed in recent years in Siemens pre-Konvoi type of pressurized water reactors. Several potential explanations have been put forward, but no definitive conclusions could yet be drawn. Among others, changes in fuel assembly or pin vibration patterns, due to recent modifications of assembly structural designs, were pointed out as a possible cause. Computational dynamic tools are currently developed within the Horizon 2020 European project CORTEX, to help with understanding the additional noise amplitude. The COLIBRI program is used for their validation. An in-core device was designed, tested, and licensed between 2015 and 2019 for fuel rods oscillation in CROCUS, in successive steps from out-of-pile tests with dummy fuel rods to critical in-core tests. The characterization of its mechanical behavior is presented, in air and in water, and as a function of the load, for safety and experimental purposes. The device allows simultaneously oscillating up to 18 fuel rods. The maximum oscillation amplitude is 5 mm, while the maximum allowed frequency is 2 Hz, i.e. in the frequency range in which the induced neutron flux fluctuations are most pronounced in nuclear power plants.

Publisher

EDP Sciences

Reference27 articles.

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3. Lamirand V., Rais A., Hübner S., Lange C., Pohlus J., Paquee U., Pohl C., Pakari O., Frajtag P., Godat D., Hursin M., Laureau A., Perret G., Fiorina C., and Pautz A., “Neutron noise experiments in the AKR–2 and CROCUS reactors for the European project CORTEX,” in ANIMMA 2019, 2019.

4. Rais A., Pakari O., Laureau A., Pohlus J., Pohl C., Lamirand V., Hursin M., and Pautz A., “Towards the validation of neutron noise simulators: qualification of data acquisition systems.”

5. Lamirand V., Frajtag P., Godat D., Hursin M., Perret G., Pakari O. V., Laureau A., Rais A., Fiorina C., Chadwick M., and Pautz A., “The COLIBRI programme in CROCUS: development and licensing of a fuel rods oscillator,” in RRFM/IGORR 2019, 2019.

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