2018-4(29)

Design, manufacturing and commissioning of nuclear industry equipment

Article NameThe Influence of Coolant Oscillation Damping Decrement of the NPP Primary Circuit with WWER during Service Life of Welded Joints
AuthorsK.N. Proskuryakov
Address

National Research University «MPEI», Krasnokazarmennaya St., 14, Moscow, Russia, 111250

ORCID iD: 0000-0002-1884-5576

WoS Researcher ID: I-3583-2017

e-mail: ProskuriakovKN@mpei.ru

AbstractThe operation of the NPP power unit in maneuverable modes in comparison with the operation in the basic mode creates additional low-cycle and high-cycle loads on the equipment. The number of cycles depends on the energy dissipation in the process of attenuation of pressure oscillations and vibrations in the acoustic elements (sections) forming the first WWER circuit. It is shown that the results of approximate theoretical estimates of the damping decrements differ significantly from the values of the signal power spectra of pulsation pressure and vibration sensors determined by the results of measurements of the auto-spectral power densities. It is concluded From the comparison of the results that careful experimental studies of energy dissipation are necessary when the main circulation pumps are turned off / on. It was established that the connections of the main circulation pipe sections: with the respiratory pipe of the pressure compensator; at the inlet and outlet of the reactor; with hot and cold collector steam generators have small logarithmic decrements of attenuation of pressure fluctuations. The number of high-cycle loads in these compounds when the plant operates not only in maneuverable, but also in basic modes exceeds design estimates and it is one of the causes of welded joint damage. NRU MEI develops acoustic frequency filters to suppress high-cycle vibration-acoustic loads.
Keywordsmaneuverable modes, high-cycle loads, acoustic model, equipment, vibrations, quality factor, resonance, damper
LanguageRussian
References

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