Analysis of Thermal-hydraulic Fluctuations in Trillo NPP with CTF/PARCS v. 2.7 Coupled Code

[EN] The low-frequency noises are fluctuations in the neutron flux density, in the low-frequency range up to 4 Hz, which generate noise in the neutron instrumentation and could affect the limitation and protection system of the reactor core. Some European pressurized water reactors (PWRs) experienced the effect of low-frequency noise, opening a new research line for the verification of the neutron-kinetics/thermal-hydraulic coupled codes. A CTF/PARCS v. 2.7 simulation study to verify whether periodical fluctuations in the core inlet temperature could activate the core protection system has been done, obtaining the frequency spectrum of the power oscillation amplitudes.This work has been supported by the Ministerio de Economia y Competitividad under the project NUC-MULTPHYS ENE-2012-34585 and sponsored by the FEDER funds of the European Union.Abarca Giménez, A.; Miró Herrero, R.; Verdú Martín, GJ.; Bermejo, JA. (2016). Analysis of Thermal-hydraulic Fluctuations in Trillo NPP with CTF/PARCS v. 2.7 Coupled Code. Journal of Nuclear Engineering and Radiation Science. 2(2):1-5. https://doi.org/10.1115/1.4031660152