New generation first of the kind unit – VVER 1200 design features

Asmolov, V. G.; Gusev, I. N.; Yurin, V.E.; Povarov, V. P.; Statsura, Dmitry Borisovich

doi:10.26583/npe.2017.3.01

Cited by 2 publications

(1 citation statement)

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“…At an elevated cooling water temperature, in order to ensure the required temperature regime of the turbine plant technological systems, it is necessary to put into parallel operation the standby heat exchangers of the lubrication system and the backup pump of the nonessential cooling water system (PCC01AP001 (002)), which increases the risk of an unplanned decrease in the electrical load when they are turned off in the event of a malfunction. Due to the lack of the backup equipment for the service water supply system of the turbine hall consumers (Asmolov et al 2017), in the event of shutdown of one of the operating pumps, it becomes necessary to reduce the load of the power unit due to insufficient cooling capacity of the Figure 1. Dependence of the electric power of the unit onthe temperature of the cooling water: 1 -power of the unit, MW; 2 -cooling water temperature.…”

Section: Service Water Supply System Operating Modesmentioning

confidence: 99%

Operating experience and ways to improve the performance of the service water supply system at the Novovoronezh NPP II (Units 1 and 2)

Povarov¹,

Statsura²,

Usachev³

2020

NUCET

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The operating experience of Novovoronezh NPP II-1 shows that, in the summer period, the temperature of the cooling water exceeds the design value: this indicates the insufficient performance of the service water supply system. The main factor that has a negative impact on the performance of this system is the formation of carbonate deposits on the cooling tower filler. At Novovoronezh NPP II-1, the cooling tower water distribution system was cleaned from carbonate deposits by the method of combined vibration and aerohydraulic impact. The tested method of cleaning the filler cannot be considered optimal, since the main stage that determines the entire cleaning duration is the assembly/disassembly of the cooling tower filler. It is necessary to continue research on the choice of a strategy for controlling the carbonate deposition rate, taking into account the revealed influence of the design features of the main cooling water pipelines and pipelines of the cooling tower water distribution system on the mechanism of deposit formation in the peripheral spraying area. As compensating measures to ensure the required temperature regime of the turbine plant equipment at Novovoronezh NPP II-1, it is practiced during the summer period to put the standby heat exchangers of the lubrication system and the standby pump of the nonessential services cooling water system into parallel operation. This solution is fraught with the risk of an unplanned decrease in the electrical load if this equipment is turned off in the event of a malfunction. To increase the operating stability of Novovoronezh NPP II-1 and -2 in the summer period, it is proposed to carry out a number of measures aimed at mitigating the negative consequences caused by the elevated service water temperature. Equipment upgrade options are evaluated, e.g., by installing an additional pump for the turbine building services cooling system and (or) laying an additional pipeline to supply part of the makeup water from the Don River directly to the suction pipelines of the pumps of the turbine building services cooling system.

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Section: Service Water Supply System Operating Modesmentioning

confidence: 99%

Operating experience and ways to improve the performance of the service water supply system at the Novovoronezh NPP II (Units 1 and 2)

Povarov¹,

Statsura²,

Usachev³

2020

NUCET

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Simulating operation of power units 1 and 2 at Novovoronezh NPP II with two electrical feed pumps disabled and the backup pump not enabled

Gusev¹,

Vorobyev²,

Kozlovsky³

et al. 2021

NUCET

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Introduction. The article analyzes the operation of Unit 1 and 2 of Novovoronezh Nuclear Power Plant II (equipped with VVER-1200 reactors) with two electrical feed pumps disabled and the backup pump not enabled. These operating conditions are subsequently simulated using the power unit model software-hardware package (PUM SHC) developed by LLC IF SNIIP ATOM. Research objectives. The objective of this work was to check the reliability of the forecasts of changes in the power unit parameters obtained using the PUM SHC, based on operational data. Methods. The simulated power unit parameter changes in transient conditions were in good agreement with the data collected in real tests. During the simulation, the power unit dynamic stability was preserved, i.e., the operational parameters were within the design limits and did not exceed the protection operation set points. Results. The results of the work suggest the possibility of using current NPP power unit simulations: for developing proposals for adjusting the operation control algorithms in case of malfunctions and emergency modes with the main equipment shutdown and power unit protection actuation; and for verifying design solutions for updating the power unit systems, which are associated with the use of new equipment or changes in flow diagrams. Conclusion. Current power unit models can be applied both for existing power units and for new ones that are being commissioned.

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New generation first of the kind unit – VVER 1200 design features

Cited by 2 publications

References 0 publications

Operating experience and ways to improve the performance of the service water supply system at the Novovoronezh NPP II (Units 1 and 2)

Operating experience and ways to improve the performance of the service water supply system at the Novovoronezh NPP II (Units 1 and 2)

Simulating operation of power units 1 and 2 at Novovoronezh NPP II with two electrical feed pumps disabled and the backup pump not enabled

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