Optimization of Control Algorithms of NPP with WWER-1200 to Minimize First Circuit Water Exchange in the Implementation of Daily Maneuvering (Load Following) Modes

Vygovskiy, Sergey Borisovich; Malkawi, Rashdan T. Al; Khachatryan, Artsrun Gagikovich; Abrahamyan, Sh.H.

doi:10.26583/gns-2018-03-07

Cited by 2 publications

(1 citation statement)

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“…The thing is that the required water exchange consumption to make up for the fuel burnup increases significantly towards the end of the core life. In accordance with (Rashdan 2018, Vygovsky et al 2018, 2019, there is a formula for the liquid waste calculation as follows:…”

Section: Operational Tasks In Suppression Of Local Power Xenon Oscill...mentioning

confidence: 99%

Investigation of algorithms for suppressing xenon oscillations in a VVER-1200 reactor

Soloviev¹,

Khachatryan²,

Chernov³

et al. 2022

NUCET

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This paper presents the results of numerical studies of various algorithms for suppression of xenon offset and power distribution oscillations in the core of a VVER-1200 reactor. The purpose of the research is to select an algorithm that minimizes the amount of liquid radioactive wastes during water exchange in the primary circuit of a nuclear power plant. For this, several algorithms for xenon oscillations suppression were considered. The first algorithm considered was an algorithm for suppression of xenon oscillations, which uses regulation due to AWP only, without utilization of any additional regulation. The second algorithm considered was an algorithm based on the use both AWP and boron regulation. In this algorithm suppression of xenon oscillations was carried out with the help of accelerated initiation of the work of the AWP by changing the boric acid concentration with constant second circuit pressure of the NPP and by utilization of the second control rods group. Last algorithm considered was algorithm based on the use of temperature control for accelerated initiation of the work of the AWP. In this algorithm, xenon oscillations suppression was carried out by changing coolant temperature at the reactor inlet caused by pressure change in the secondary circuit in the normal operation margins, and by involving the second group of control rods. It was shown that the best way to suppress xenon offset and power distribution oscillations in terms of minimization of radioactive liquid wastes amount is the algorithm with accelerated initiation of the AWP due to temperature regulation, with elimination of temperature regulation after minimizing of current axial offset value deviation from the nominal one.

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Section: Operational Tasks In Suppression Of Local Power Xenon Oscill...mentioning

confidence: 99%

Investigation of algorithms for suppressing xenon oscillations in a VVER-1200 reactor

Soloviev¹,

Khachatryan²,

Chernov³

et al. 2022

NUCET

View full text Add to dashboard Cite

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An analysis of the “Fast” noise measurements of the dynamic VVER processes

Arkadov,

Pavelko,

Slepov

2024

NUCET

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Studies of maneuverable modes of VVER to confirm the possibility of participation of nuclear power plants in the mode of daily carrying capacity have been conducted for quite a long time. Tests at various nuclear power plants with VVER-1000 (Zaporizhzhia NPP in 1998, Khmelnitsky NPP in 2005, Tianwan NPP in 2007) have shown the practical possibility of NPP participation in the daily schedule of carrying capacity, however, the commissioning of nuclear power plants with VVER-1200 requires similar work on all new units with VVER-1200: NVAES-2, LNPP-2 Belarusian NPP. The article presents some aspects of the use of noise control methods for analyzing the condition of equipment and the core. Since the emergence of the technology of noise analysis of signals from VVER reactor installations, researchers have formulated several criteria for obtaining results of appropriate quality. The fundamental requirement for conducting noise experiments was the registration of data in stationary modes of operation of power units, since any non-stationarity made significant changes in spectral estimates, which ultimately complicated the work and “distorted” the results obtained. This requirement was included in the operating instructions of various diagnostic systems using noise signal analysis methods (the SUS system, manufactured by Siemens). For a long period of time, the current situation suited both developers of various diagnostic systems and NPP personnel operating them at power units. On the one hand, this was due to the imperfection of the technical means used (low speed of analog-to-digital converters, limited storage capacity, bulky equipment, etc.), on the other hand, the use of domestic NPP power units only in the base load mode without tracking daily power fluctuations in the power system. The standard archives of the upper block level system, the in-reactor control system and additionally produced multi-channel “fast” measurements with a frequency of 1 kHz for the analysis of maneuverable mode 95-55-95% of the VVER-1200 reactor plant were analyzed. Global disturbances of the core have been detected after one step of the regulatory body of the control and protection system, which attenuates within one second if the next step of the control and protection system has not occurred during this time. Such fast neutron processes can be controlled only by neutron-noise measurements with an upper frequency of at least 20 Hz.

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Optimization of Control Algorithms of NPP with WWER-1200 to Minimize First Circuit Water Exchange in the Implementation of Daily Maneuvering (Load Following) Modes

Cited by 2 publications

References 0 publications

Investigation of algorithms for suppressing xenon oscillations in a VVER-1200 reactor

Investigation of algorithms for suppressing xenon oscillations in a VVER-1200 reactor

An analysis of the “Fast” noise measurements of the dynamic VVER processes

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Optimization of Control Algorithms of NPP with WWER-1200 to Minimize First Circuit Water Exchange in the Implementation of Daily Maneuvering (Load Following) Modes

Cited by 2 publications

References 0 publications

﻿Investigation of algorithms for suppressing xenon oscillations in a VVER-1200 reactor

﻿Investigation of algorithms for suppressing xenon oscillations in a VVER-1200 reactor

An analysis of the “Fast” noise measurements of the dynamic VVER processes

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Investigation of algorithms for suppressing xenon oscillations in a VVER-1200 reactor

Investigation of algorithms for suppressing xenon oscillations in a VVER-1200 reactor