Design, manufacturing and commissioning of nuclear industry equipment
Article Name | The Influence of Coolant Oscillation Damping Decrement of the NPP Primary Circuit with WWER during Service Life of Welded Joints |
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Authors | K.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 |
Abstract | The 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. |
Keywords | maneuverable modes, high-cycle loads, acoustic model, equipment, vibrations, quality factor, resonance, damper |
Language | Russian |
References | [1] Zy`kov A.S. Texniko-e`konomicheskie aspekty` obosnovaniya primeneniya vy`sokovol`tnogo chastotno-reguliruemogo e`lektroprivoda na nasosax GCzNA, PE`N, KE`N i CzN v novy`x i perspektivny`x proektax AE`S s VVE`R s uchetom novy`x trebovanij po manevrenny`m rezhimam [Technical and Economic Aspects of Justification of Application of the High-Voltage Frequency-Controlled Electric Drive on Pumps of GTSNA, PEN, KEN and TSN in New and Perspective Projects of NPP with WWER Taking into Account New Requirements for Maneuvering Modes]. |
Papers | 47 - 54 |
URL Article | URL Article |
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