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Research Papers

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

[+] Author and Article Information
A. Abarca

Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM),
Universitat Politècnica de València,
Camí de Vera s/n, 46021 València, Spain
e-mail: aabarca@isirym.upv.es

R. Miró

Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM),
Universitat Politècnica de València,
Camí de Vera s/n, 46021 València, Spain
e-mail: rmiro@iqn.upv.es

G. Verdú

Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM),
Universitat Politècnica de València,
Camí de Vera s/n, 46021 València, Spain
e-mail: gverdu@iqn.upv.es

J. A. Bermejo

Iberdrola Ingeniería y Construcción S.A.U,
Av. Manoteras, 20. Edificio C, 28050 Madrid, Spain
e-mail: jbpi.iberinco@cnat.es

Manuscript received March 16, 2015; final manuscript received September 17, 2015; published online February 29, 2016. Assoc. Editor: Leon Cizelj.

ASME J of Nuclear Rad Sci 2(2), 021023 (Feb 29, 2016) (5 pages) Paper No: NERS-15-1030; doi: 10.1115/1.4031660 History: Received March 16, 2015; Accepted September 17, 2015

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.

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References

Figures

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Fig. 1

Radial scheme of the thermal-hydraulic channels

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Fig. 2

Radial scheme of the neutronic model

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Fig. 3

Coupling scheme and data flow

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Fig. 4

S3 and CTF/PARCS axial power profiles for BOC simulation

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Fig. 5

CTF/PARCS relative errors in the radial power profile for BOC simulation

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Fig. 6

S3 and CTF/PARCS axial power profiles for EOC simulation

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Fig. 7

CTF/PARCS relative errors in the radial power profile for EOC simulation

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Fig. 8

Frequency distribution of the total power oscillation amplitude (% nominal power)

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Fig. 9

Frequency distribution of the mean coolant temperature oscillation amplitude (K)

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