generating records annual report 2014

VVER Power Units Capacity Increase

One of the options to increase power generation at NPP power units with VVER reactors consists in increasing heat capacity of reactor plants using engineering reserves of equipment taking into account the actual characteristics obtained upon its manufacturing and recorded during operation.

The program on operation of VVER power units at an increased capacity forms part of a big program aimed at increasing power generation at operating NPP power units of Rosenergoatom Concern.

Pursuant to the Concern’s plan, power unit No. 1 of Balakovo NPP, No. 1 of Rostov NPP, and No. 4 of Kola NPP were switched to an industrial operation (IO) at an increased capacity in 2014. In 2014, the permit of Rostekhnadzor for pilot operation (PO) of power unit No. 3 of Kola NPP was issued. Capacity increase and start of the pilot operation is scheduled for 2015.

AFTER START OF THE PILOT OPERATION OF VVER POWER UNITS AT AN INCREASED CAPACITY, NO SIGNIFICANT ENVIRONMENTAL CHANGES WERE REVEALED AT ANY OF NPPS.

During operation of power units at an increased capacity we conducted and continue conducting an analysis of the main parameters of reactor unit to ensure compliance with permissible operating limits. According to this analysis, the values of neutronic and thermohydraulic characteristics of the active zone are compliant with design parameters and meet the requirements and design limitations set forth in the process rules for safe operation of power units.

Results of tests and operating experience confirmed the possibility of stable and safe operation of NPP power units with VVER-type reactors at an increased capacity level.

Program results
9

VVER-1000 reactors operate at an increased capacity of 104%

2

VVER-440 reactors operate at an increased capacity of 107%

14,26

bln KWh – additional energy generation in 2008-2014

40

reactor years is the additional operation time from the program start

Schedule of Switching VVER-1000 Units to Operation at an Increased Capacity of 104% Nnom

1st unit of Balakovo NPP

2nd unit of Balakovo NPP

3rd unit of Balakovo NPP

4th unit of Balakovo NPP

1st unit of Kalinin NPP

2nd unit of Kalinin NPP

3nd unit of Kalinin NPP

4nd unit of Kalinin NPP

1st unit of Rostov NPP

2nd unit of Rostov NPP

Increase of power capacity by 1 KW is approximately 10 times cheaper than the construction cost of 1 KW of new power capacity.

Performance results while operating at an increased capacity
Parameter name Capacity level
104% Nnom Operating limit
Thermohydraulics

Reactor thermal capacity (taking into account the temperature accuracy provided by
regulating system), MW

3 115-3 120

3 120

Heating heat transfer agent in reactor, °С

29,7-32,5

33,5

Maximum heating of heat transfer agent in reactor loop/maximum capacity of reactor loop, °С/MW

30,0-32,4 / 758-797

33,0 / 800

Maximum heating of heat transfer agent in FA per ICIS readings, °С

39,4-43,0

44,5

Temperature of heat transfer agent at the reactor inlet in any operating loop, °С

287-230,3

291

Reactor neutronics

FA maximum capacity as per ICIS readings, MW

23,8-26,0

27

FA energy release variance ratio as per ICIS readings

1,24-1,40

-

Minimum reserve on energy release variance by volume of active area as per ICIS readings

1,05

No less than 1