Comprehensive measurement of diagnostic parameters of equipment at the power unit № 1 of Novovoronezh NPP ii in the process of pilot operation

Fedorov, A. I.; Slepov, Michael Timofeevich

doi:10.26583/npe.2017.3.07

Cited by 4 publications

(3 citation statements)

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“…The process of the coolant heat-up by ~ 300 °C leads to the coalescence of some reactor coolant pump (RCP) rotational frequency harmonic with the central frequency of some ASW (or its harmonic). Such calescence cannot be allowed in the nominal mode of operation with a 100% level of the reactor power but is inevitable in dynamic modes (Pavelko et al 2016, Fedorov andSlepov 2017). As estimated by the authors, the whole of the MCC undergoes, sequentially, eight resonant excitation modes during the unit heat-up (Fig.…”

Section: Resonant Excitation In Case Of Coincidence Of the Rcp Rotati...mentioning

confidence: 99%

“…The analyzer is controlled using the LMS Test.Xpress software that includes the accelerator programming, channel calibration, measurement parameter adjustment, measurement control and data analysis functions. More detailed information on measurements is provided in (Pavelko et al 2016, Fedorov andSlepov 2017).…”

Section: Experimental Determination Of the Asw Properties For Vver-12...mentioning

confidence: 99%

“…Let us note that the RCP (Pavelko et al 2016, Fedorov andSlepov 2017) is an asynchronous ac machine which, just like any pump set, has an efficiency equal to 0.7 in operating modes. Electricity needs to be therefore consumed to generate and maintain the ASW in the MCC with efficiency taken into account which leads to a new interval estimate of the power loss per one RCP of [0.048, 0.48] MW, this being ~ 0.2 to ~ 2.0 MW for the entire unit.…”

Section: Estimation Of the Rcp Power Losses For Asw Generationmentioning

confidence: 99%

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Phenomenology of acoustic standing waves as applied to the VVER-1200 reactor plant

Arkadov¹,

Pavelko²,

Povarov³

et al. 2022

NUCET

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The insufficiently studied issues of acoustic standing waves (ASW) in the main circulation circuits of the VVER reactor plants are considered. For a long time no proper attention has been given to this phenomenon both by the researchers and NPP experts. In general, generation of ASWs requires the acoustic inhomogeneities of the medium in the planes perpendicular to the direction of propagation of the longitudinal wave, in which a jump in acoustic resistance occurs, this is shown by the authors based on an example of the wave equation solution (D’Alembert equation) for a certain function of two variables. The ASW classification has been developed based on the obtained experimental material, 6 ASW types have been described, and their key parameters have been specified. The amplitude distributions have been plotted for all major ASW types proceeding from the phase relations of signals from the pressure pulsation detectors and accelerometers installed on the MCC pipelines. The nature of these distributions is general and they are valid for all VVER types. For the first time the globality of all lowest ASW types is identified. Four attribute properties of the ASWs have been formulated. The first attribute is the regular ASW temperature dependences, which is the source of the diagnostic information in the process of heating/cooling of the VVER unit. The linear experimental dependences of the ASW frequencies on coolant temperature have been obtained. The frequencies, at which the MCC resonant excitation due to coincidence of the ASW frequencies with the RCP rotational frequency harmonics, have been found experimentally. The ASW energy, which origin has resulted from the RCP operation, is estimated. The RCP operation can be presented as continuous generation of pressure pulsations, which fall onto the acoustic path inhomogeneities in the form of a traveling wave and generate a standing wave after reflection from them.

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Section: Resonant Excitation In Case Of Coincidence Of the Rcp Rotati...mentioning

confidence: 99%

Section: Experimental Determination Of the Asw Properties For Vver-12...mentioning

confidence: 99%

Section: Estimation Of the Rcp Power Losses For Asw Generationmentioning

confidence: 99%

See 1 more Smart Citation

Phenomenology of acoustic standing waves as applied to the VVER-1200 reactor plant

Arkadov¹,

Pavelko²,

Povarov³

et al. 2022

NUCET

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A New Conceptual Approach to the Organization of Technical Diagnostics Service at Nuclear Power Plants With Vver

Slepov¹

2022

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The article identifies and summarizes the main problems that arise in the process of production activities of NPP technical diagnostics services. The analysis is carried out and the main directions of efficiency improvement are formulated, based on the personal experience of the author. Some features of the operation of various technical diagnostics systems are disclosed. The concept of multichannel synchronized measurements developed by the author is presented.

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On Vibration Control of Turbo Generators K-1200-6.8/50+ Т3В-1200-2АУЗ Installed in the First and Second Units of Novovoronezh Nuclear Power Plant

Arkadov¹,

Gusev

Slepov

et al. 2022

PoHEI.MB

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The paper briefly describes the K-1200-6.8/50 turbine, a component of the innovative VVER-1200 pressurised water reactor unit. The main advantage of this turbine is that instead of implementing cooling by filling the generator interior with hydrogen it uses full water cooling, which prevents explosion or combustion. Direct cooling of the stator winding works as follows: distillate circulating in a closed circuit flows through hollow stainless steel water-cooling components laid within the stator grooves. The number of hollow water-cooling elements in the stator grooves is dictated by a desire to ensure sufficient cooling efficiency while minimising electromagnetic losses. The paper considers the features of vibration manifested and vibration control of the turbo generator in terms of the generator-exciter assembly, as, when seeking to minimise time spent on mounting and adjusting loads while performing vibration correction via balancing, the most readily available planes are those located on the rotors of the generator and exciter. We investigated the possibility to reduce axial components of oscillations occurring in supports No. 10 and 11 by balancing the shaft line rotors in their own bearings at the operating frequency.

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Comprehensive measurement of diagnostic parameters of equipment at the power unit № 1 of Novovoronezh NPP ii in the process of pilot operation

Abstract: И з в е с т и я в у з о в • Я д е р н а я э н е р г е т и к а • № 3 • 2 0 1 7 77

Cited by 4 publications

References 0 publications

Phenomenology of acoustic standing waves as applied to the VVER-1200 reactor plant

Phenomenology of acoustic standing waves as applied to the VVER-1200 reactor plant

A New Conceptual Approach to the Organization of Technical Diagnostics Service at Nuclear Power Plants With Vver

On Vibration Control of Turbo Generators K-1200-6.8/50+ Т3В-1200-2АУЗ Installed in the First and Second Units of Novovoronezh Nuclear Power Plant

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Comprehensive measurement of diagnostic parameters of equipment at the power unit № 1 of Novovoronezh NPP ii in the process of pilot operation

Abstract: И з в е с т и я в у з о в • Я д е р н а я э н е р г е т и к а • № 3 • 2 0 1 7 77

Cited by 4 publications

References 0 publications

﻿Phenomenology of acoustic standing waves as applied to the VVER-1200 reactor plant

﻿Phenomenology of acoustic standing waves as applied to the VVER-1200 reactor plant

A New Conceptual Approach to the Organization of Technical Diagnostics Service at Nuclear Power Plants With Vver

On Vibration Control of Turbo Generators K-1200-6.8/50+ Т3В-1200-2АУЗ Installed in the First and Second Units of Novovoronezh Nuclear Power Plant

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Phenomenology of acoustic standing waves as applied to the VVER-1200 reactor plant

Phenomenology of acoustic standing waves as applied to the VVER-1200 reactor plant