The water feedback system shown in Fig. 5.14 carries fresh water to the separator drums in either normal, transient or emergency operation of the reactor. From the condenser of the turbine the coolant arrives at the first stage condensate pump (1), then it is pre-heated in the ejector (2) and filtered (3). From the second stage condensate pump (4) it is heated in a series of five heaters (6) up to 190 oC, and then mixed with the condensate from the other turbogenerator and arrives at the deaerator (8) to be sent into the main feed water pump (5) and to the main feeder (13). Auxiliary feed water pumps (7) supply the coolant to the auxiliary feeder. The liquid stored in the deaerators can be used in emergency both through the main feeder and through the auxiliary feeder (12). The deaerator is heated by steam from the inter-turbine sink and from the fast-acting Steam Discharge Valve to the Deaerator (SDV-D) (9).
5.5.1 Operation
In normal or transient operation of the reactor, for pressure variations from 10% to nominal value, feedwater is supplied to the separator drums by the Main Feed Water Pumps (MFWP). The six parallel pumps ensure a reliable nominal-load operation of the separator drums with a 10 % reserve even when one of the pumps fails, and one, as is the case under normal operating conditions, is on standby.
Auxiliary Feed Water Pumps (AFWP) are activated:
Fig. 5.14 Water feedback system
1 - condensate pump of the first stage, 2 - main ejector and seal ejector cooler, 3 - condensate filter, 4 - condensate pump of the second stage, 5 - MFWPs, 6 - low pressure reheaters, 7 - AFWPs, 8 - deaerators, 9 - SDV-D, 10 - deminiralized water storage tank, 11 - auxiliary deaerator makeup pumps, 12 - auxiliary feeder, 13 - main feeder, 14 - mixer
In addition to this, the MFWPs and the AFWPs are utilized to cool the reactor during an emergency (for example, in case of a LOCA event). Note that the pumps are not tripped in the event of an accident, but continue to operate until they are able to do so. In accident scenarios which have been analyzed MFWPs can be stopped due to cavitation or loss of off-site-power.
The suction and pressure pipes of the MFWPs are connected to the suction and pressure headers. Each header consists of gate-valve separated chambers to ensure normal operation of at least three MFWPs with one maintained on standby for servicing. The pressure piping can feed the two MCC loops if one of the MFWPs fails. Control valves are installed in the piping of both main and auxiliary feed lines to ensure the safe operation even with very low pressures in the separator drums, e.g., during a transient involving loss of coolant from the MCC.
Feedwater arrives at the separator drums from the main feeder lines, one per the MCC loop, along four pipes (530 x 28) mm, one for each separator drum. The feeder system consists of three parallel lines, one standing by, interconnected at their two ends.
Two auxiliary feeder systems, one per each MCC loop, supply the coolant to the separator drums from AFWPs along two pipes (219 x 13) mm. They are connected to the separator drums downstream of the main feeders.
Feedwater is supplied to the pressure headers by both the main and the AFWPs along two pipes, one (426x24) mm, the other (219 x 13) mm to be fed to the emergency headers.
To avoid cavitation in the AFWPs when they are activated due to a pressure loss in the deaerators, four deaerator auxiliary makeup system pumps are connected to the suction headers of the AFWPs. They take water from the auxiliary deminiralized water storage tanks. The volume of the water, stored in this tank, should never be less than 1000 m3.
A recirculation piping system is included to eliminate overheating and pressure fluctuations of the feedwater in the low-power operation mode. These pipes connect main and emergency feed pumps pressure headers to the deaerator.
5.5.2 Operation Parameters of the Water Feedback System
When the two turbogenerators of a reactor function at their nominal power, the groups of deaerators pairs and the six MFWPs operate on their normal loads. Total flowrate of the feedwater is then 2444 kg/s. When a single turbogenerator is running, only one pair of deaerators is in operation, the others are disconnected. Total flow rate of the feedwater is then 1222 kg/s, all other parameters are at their nominal magnitude.
In transient operation modes, such as start-up, cool-down or low-power operation, feedwater arrives from the AFWPs, provided the flow rate needed is below 10 % of the nominal value. The level of liquid in the separator drums is then maintained within ± 50 mm of the nominal level. For feedwater parameters in nominal and in transient operation, see Table 5.14.
5.5.3 Components of the System
Components of the feedwater piping system are described at the beginning of this Section. Here some details of their construction are presented.
5.5.3.1 Condensate Pumps
Two-stage lines supply the condensate to the deaerators. The lower-stage pipes carry the condensate from the condenser of the turbine via the purification system into the suction side of the upper line where it is carried via the low-pressure reheaters into the deaerators.
The upright four-stage pumps of the lower pumping line, specified in Table 5.15 are vertical. The vertical construction of the pumps allows to maintain the pumps without disconnecting the piping. Their shafts are mechanically sealed to prevent leakage. The pumps are installed in a closed container, are connected by shafts extending across the concrete wall and are fixed by joints to the pumps at one end and to the electric motors at the other.
The pumps of the second stage are horizontal. The centrifugal, one - stage, with double - sided rotor, it possesses sufficient pressure not only to withstand the high resistance of the four reheaters, but also to lift the condensate into the deaerators, see Table 5.16 [41].
5.5.3.2 Filtration of the Condensate
The combined desalination filters with integral regenerators filter-out all electrolytes and all silica acids coming from the suction side of the coolant in the condensers. The condensate is compressed to 3.2 MPa and filtered in a downward flow across a bed of H-kationite and OH-anionite. Kations in the coolant are exchanged to H ions on the kationides, and any ions to OH on the anionite. Filtration cycle takes 95 days, then the ionite bed is transferred to the regenerator to restore its activity. The filter is an upright single-shell cylinder with the upper, medium and lower distributors. The parameters of filters are present in the Table 5.17.
Water quality behind condensate filters must meet the following criteria [36]:
5.5.3.3 Pre-Heating the Condensate
The condensate is pre-heated in five regenerating reheaters. Reheater 1 is a double-shell unit, pre-heaters 2, 3, 4, 5, are single - shell vertical units with tube bundles. The higher - pressure liquid - fraction internal flow occurs in the stainless steel tubes in a shell - side flow of steam of a lower pressure. This arrangement reduces the shell - side pressure and prevents liquid from boiling. The steam goes to the top, but the steam-water mixture is discharged at the bottom. The reheaters are specified in Tables 5.18 - 5.22 [44].
Table 5.14 Operation parameter of feedwater
|
Parameters * |
Nominal operation** |
Starting transient |
Cooling transient |
Low load |
|
Pressure in separator drums, MPa |
6.47-6.96 |
0.2-6.96 |
6.96-0.2 |
6.96 |
|
Pressure in deaerators, MPa |
1.28 |
0.2-1.28 |
1.28-0.2 |
1.28 |
|
Feedwater flow - rate, kg/s |
2055-2125 |
0-278 |
278-0 |
278 |
|
Pressure in the pressure header of MFWP, MPa |
8.9 |
- |
- |
- |
|
Pressure in the pressure header of AFWP, MPa |
- |
0.2-9.1 |
9.1-0.2 |
9.1 |
|
Pressure in the main feeder, MPa |
8.55 |
- |
- |
- |
|
Pressure in the emergency feeder, MPa |
- |
0.2-8.4 |
8.4-0.2 |
8.4 |
|
Feedwater temperature, oC |
177-190 |
30-190 |
190-50 |
190 |
* Absolute pressures
** At 4200 MW (th) power
Table 5.15 Specification of the condensate pump of first stage [41] (type - 1500-120, manufacturer - Scientific and Industry Union "Nasosenergomash" Sumy, Ukraine)
|
Number per reactor |
6 |
|
|
Capacity, m3/s |
0.417 |
|
|
Head, MPa |
1.117 |
|
|
Pumping power, kW |
559 |
|
|
Efficiency, % |
80 |
|
|
Cavitation margin, m |
2.3 |
|
|
Absolute suction pressure, MPa |
0.296 |
|
|
Temperature of pumping water, oC |
70 |
|
|
Overall dimensions, m: |
||
|
- height |
3.440 |
|
|
- length |
1.900 |
|
|
- width |
1.860 |
|
|
Mass of pump equipment (with electric motor), kg |
24170 |
|
|
Electric motor (type - VAN (AV) 15-36-8AMU4, manufacturer - "Uralelektrotyazmash", Russia) |
||
|
Rotational speed, rpm |
740 |
|
|
Electric motor power, kW |
1000 |
|
|
Voltage, V |
6000 |
|
|
Mass of the electric motor, kg |
10710 |
|
Table 5.16 Specifications of the condensate pump of second stage [41] (type - 1500-180-2, manufacturer - Scientific and Industry Union "Nasosenergomash" Sumy, Ukraine)
|
Number per reactor |
6 |
|
|
Capacity, m3/s |
0.417 |
|
|
Head, MPa |
1.766 |
|
|
Pump power, kW |
1141 |
|
|
Efficiency, % |
84 |
|
|
Cavitation margin, m |
22 |
|
|
Temperature of pumping water, oC |
70 |
|
|
Overall dimensions, m: |
||
|
- height |
1.740 |
|
|
- length |
2.020 |
|
|
- width |
1.513 |
|
|
Mass of pump equipment (with electric motor), kg |
8715 |
|
|
Electric motor (type - 2AZM-1600/6000UCh14) |
||
|
Rotational speed, rpm |
2975 |
|
|
Electric motor power, kW |
1600 |
|
|
Voltage, V |
6000 |
|
|
Mass of the electric motor, kg |
5280 |
|
Table 5.17 Specifications of condensate filters [19] (type - AFISDNr-3.0-1.6)
|
Nominal diameter, m |
3.0 |
|
Nominal pressure, MPa |
1.6 |
|
Capacity, kg/s |
150 |
|
Overall height, m |
4.1 |
|
Entire mass, kg |
6600 |
|
Height of the filter bed, m |
1.0 |
|
Composition of the filter bed |
ions KU-2 and AV-17 |
Table 5.18 Low pressure reheater PND-1 [44] (type - PN-1200-42-4-IA, manufacturer - Industrial Union "Krasnij Kotelshik", Taganrog, Russia)
|
Number per reactor |
4 (2/turbine) |
|
|
Condensate mass flow rate, kg/s |
422.5* |
|
|
Pressure, MPa: |
||
|
- of steam |
< 1.0* |
|
|
- of heating condensate |
< 4.2* |
|
|
Maximum temperature of steam, oC |
150* |
|
|
Hydraulic drag resistance of condensate, MPa |
0.0216* |
|
|
Heat transfer surface area, m2 |
1200 |
|
|
Heat transfer rate (power), MW |
37.9* |
|
|
Heater dimensions, m: |
||
|
- height |
10.450 |
|
|
- diameter |
2.632 |
|
|
Dry mass, kg |
46500 |
|
|
Mass with water, kg |
70000 |
|
Table 5.19 Low pressure reheater PND-2 [44] (type - PN-1900-42-4-IA, Manufacturer - Industrial Union "Krasnij Kotelshik", Taganrog, Russia)
|
Number per reactor |
2 (1/turbine) |
|
|
Nominal condensate flow rate, kg/s |
733.9* |
|
|
Pressure, MPa: |
||
|
- of steam |
< 1.0* |
|
|
- of heating condensate |
< 4.2* |
|
|
Maximum temperature of steam, oC |
145* |
|
|
Hydraulic drag resistance of condensate, MPa |
0.0210* |
|
|
Heat transfer surface area, m2 |
1900 |
|
|
Heat transfer rate (power), MW |
118.3* |
|
|
Heater dimensions, m: |
||
|
- height |
10.280 |
|
|
- diameter |
3.364 |
|
|
Length of shell, m |
8.345 |
|
|
Internal shell diameter, m |
2.200 |
|
|
Outside tube diameter, mm |
16 |
|
|
Thickness of tube wall, mm |
1 |
|
|
Dry mass, kg |
68900 |
|
|
Mass with water, kg |
95000 |
|
Table 5.20 Low pressure reheater PND-3 [44] (type - PN-1900-42-4-IIA, manufacturer - Industrial Union "Krasnij Kotelshik", Taganrog, Russia)
|
Number per reactor |
2 (1/turbine) |
|
Nominal condensate mass flow rate, kg/s |
818.6* |
|
Pressure, MPa: |
|
|
- of steam |
< 1.0* |
|
- of heating condensate |
< 4.2* |
|
Maximum steam temperature, oC |
145* |
|
Hydraulic drag resistance of condensate , MPa |
0.0260* |
|
Heat transfer surface area, m2 |
1900 |
|
Heat transfer rate (power), MW |
79.2* |
|
Dimensions, m: |
|
|
- height |
10.280 |
|
Continue Table 5.20 |
|
|
- diameter |
3.264 |
|
Length of shell, m |
8.345 |
|
Internal shell diameter, m |
2.200 |
|
Outside tube diameter, mm |
15 |
|
Thickness of tube walls, mm |
1 |
|
Dry mass, kg |
68200 |
|
Full mass with water, kg |
95000 |
Table 5.21 Low pressure reheater PND-4 [44] (type - PN-1900-42-4-IIIA, manufacturer - Industrial Union "Krasnij Kotelshik", Taganrog, Russia)
|
Number per reactor |
2 (1/turbine) |
|
|
Nominal condensate mass flow rate, kg/s |
818.6* |
|
|
Pressure, MPa: |
||
|
- steam |
< 1.0* |
|
|
- condensate |
< 4.2* |
|
|
Maximum steam temperature, oC |
190* |
|
|
Hydraulic drag resistance of condensate, MPa |
0.0250* |
|
|
Heat transfer surface area, m2 |
1900 |
|
|
Heat transfer rate (power), MW |
89.8* |
|
|
Dimensions, m: |
||
|
- height |
10.280 |
|
|
- diameter |
3.280 |
|
|
Length of shell, m |
8.345 |
|
|
Internal shell diameter, m |
2.200 |
|
|
Outside tube diameter, mm |
16 |
|
|
Thickness of tube walls, mm |
1 |
|
|
Dry mass, kg |
69400 |
|
|
Full mass with water, kg |
95000 |
|
Table 5.22 Low pressure reheater PND-5 [44] (type - PN-1900-42-4-IVA, manufacturer - Industrial Union "Krasnij Kotelshik", Taganrog, Russia)
|
Number per reactor |
2 (1/turbine) |
|
|
Nominal condensate mass flow rate, kg/s |
1051.4* |
|
|
Pressure, MPa: |
||
|
- steam |
< 1.0* |
|
|
- condensate |
< 4.2* |
|
|
Maximum temperature of steam, oC |
190* |
|
|
Hydraulic drag resistance of condensate, MPa |
0.0390* |
|
|
Heat transfer surface area, m2 |
1900 |
|
|
Heat transfer rate (power), MW |
70.8* |
|
|
Dimensions, m: |
||
|
- height |
10.280 |
|
|
- diameter |
3.280 |
|
|
Length of shell, m |
8.345 |
|
|
Internal shell diameter, m |
2.200 |
|
|
Outside tube diameter, mm |
16 |
|
|
Thickness of tube wall, mm |
1 |
|
|
Dry mass, kg |
70000 |
|
|
Full mass with water, kg |
95000 |
|
* Design values
5.5.3.4 Deaerators
The condensate from each turbogenerator is subject to deaeration in two parallel thermal-jet deaerators. Oxidant gases, particularly oxygen, are thus eliminated, the condensate is pre-heated and its supply in the main and auxiliary feed water system is renewed. Aside from this primary purpose, the deaerators also heat up the feedwater and store water for the separator-drums and the ECCS. Primary deaeration occurs even earlier, in the condenser storage of each turbogenerator.
The deaerators are equipped with reducers and safety valves. They are heated by steam from the primary discharge of the turbines and from the SDV-D during the turbine start-up, as long as the primary discharge pressure is lower than in the deaerator. To prevent overflow of the deaerators in the starting operation modes of the reactor, excess water from the deaerator can be returned to the deminiralized water storage tank. The feedback unit of two expansion vessels and two overflow coolers is capable of returning water at the rate of 27.8 kg/s.
An individual deaerator consists of a DP-2600 deaeration column and a BDP-120-1-11 deaeration vessel, the functions of which are:
Other specifications of the deaerator are presented in Table 5.23 [44].
5.5.3.5 Main Feed Water Pumps
The main feed water pumps are horizontal centrifugal four-stage pumps with internal casings and a balancing drum, two radial bearings, one sliding high-pressure bearing and high-pressure end seals. These operate on compressed condensate from the suction headers of the top pumping line. Before starting up the reactor the pumps are pre-heated. A pressure-lubricated gear-sleeve connects the pump to the electric motor. The pumps are equipped with pressure lubrication units. The lubricant seals and other heat exchangers are cooled by lake water.
Inlets of the pumps are flange-sealed, their upward outlets are welded together. The pumps are driven by asynchronous three-phase closed-loop cooled electric motors. Specifications of the MFWP are presented in Table 5.24 [41].
Table 5.23 Specifications of the deaerator [44] (type - DP-2600, manufacturer - Industry Union "Sibirenergomash", Barnaul)
|
Number per turbine |
2 |
||
|
Maximum capacity, kg/s |
722.2 |
||
|
Minimum capacity, kg/s |
216.7 |
||
|
Working absolute pressure, MPa |
0.93-1.28 |
||
|
Permissible absolute pressure with relief valves in operation, MPa |
1.475 |
||
|
Hydraulic test pressure, MPa |
1.6 |
||
|
Working temperature, oC |
187 |
||
|
Admissible wall temperature, oC |
200 |
||
|
Diameter of column, m |
3.451 |
||
|
Height of column, m |
7.536 |
||
|
Mass of column, kg |
26000 |
||
|
Mass of column with water, kg |
88000 |
||
|
Internal volume, m3 |
193 |
||
|
Volume of column, m3 |
62 |
||
|
Effective volume of storage (accumulator) tank, m3 |
120 |
||
|
Reliability: |
|||
|
- average lifetime , years |
30 |
||
|
- average lifetime between major servicing, h |
50000 |
Table 5.24 Specifications of the main feed water pump [41] (type - PEA-1650-80, manufacturer - Frunze Scientific and Industrial Union, Sumy, Ukraine)
|
Number per reactor |
6 operational + 1 in reserve |
|||||
|
Operation parameters: |
||||||
|
- capacity, m3/s (t/h) |
0.458 (1650) |
|||||
|
- head, MPa (m of water column) |
8.9 (910) |
|||||
|
- permissible cavitation margin, MPa (m) |
0.147 (15) |
|||||
|
- inlet temperature, oC |
190 |
|||||
|
- maximum inlet absolute pressure, MPa |
1.57 |
|||||
|
- maximum outlet absolute pressure, MPa |
11.87 |
|||||
|
- leakage in the end seals, kg/s |
0.0055 |
|||||
|
- power, kW |
4451 |
|||||
|
- mass, kg |
12700 |
|||||
|
Electric motor: |
||||||
|
- type |
2AZM1-800/6000 U4 |
|||||
|
- rotational speed, rpm |
2982 |
|||||
|
- voltage, V |
6000 |
|||||
|
- power, kW |
5000 |
|||||
|
Overall mass, kg |
24700 |
|||||
|
Electric motor mass, kg |
12700 |
|||||
|
Overall dimensions: |
||||||
|
- height, m |
1.980 |
|||||
|
- length, m |
2.995 |
|||||
|
- width, m |
1.830 |
|||||
|
Operation parameters: |
||||||
|
- efficiency , % |
83 |
|||||
|
- overall efficiency , % |
81 |
|||||
|
- average lifetime between major servicing, h |
8000 |
|||||
|
- average lifetime, years |
30 |
|||||
Table 5.25 Specifications of the emergency feed water pump [41] (type - PEA 250-80, manufacturer - Frunze Scientific and Industrial Union, Sumy, Ukraine)
|
Number per reactor |
5 operational + 1 in reserve |
||
|
Operation parameters: |
|||
|
- capacity, m3/s (m3/h) |
0.069 (250) |
||
|
- head, MPa (m) |
8.6 (880) |
||
|
- permissible cavitation margin, MPa (m) |
0.088 (9) |
||
|
- inlet temperature, oC |
190 |
||
|
- inlet pressure, MPa |
1.25 |
||
|
- maximum inlet absolute pressure, MPa |
1.57 |
||
|
- maximum outlet absolute pressure, MPa |
11.87 |
||
|
- leakage in end-seals, kg/s |
0.0055 |
||
|
- admissible concentration of solid particles, g/kg |
5 x 10-3 |
||
|
- power, kW |
725 |
||
|
Mass of assembly, kg |
8330 |
||
|
Overall dimensions: |
|||
|
- height, m |
1.340 |
||
|
- length, m |
2.320 |
||
|
- width, m |
1.290 |
||
|
Electric motor: |
|||
|
- type |
2AZM1-800/6000 U4 |
||
|
- rotational speed |
2970 |
||
|
- voltage , V |
6000 |
||
|
- power, kW |
800 |
||
|
- mass of electric motor, kg |
3680 |
||
|
Operation parameters: |
|||
|
- efficiency, % |
75 |
||
|
- cavitation margin, m |
9 |
||
|
- average time between major servicing, h |
8000 |
||
|
- average lifetime, years |
30 |
||
5.5.3.6 Auxiliary Feed Pumps
The auxiliary feed water pumps are horizontal six-stage split pumps with divided internal sections and an axial discharge. They carry axial forced-lubricated bearings and high-pressure end-seals fed by the condensate from the suction headers of the second pumping line. All heat exchangers are cooled by lake water. The outlets are welded in the upward direction, the inlets are flange-sealed. Each pump is connected to an electric motor by a gear sleeve of a thick lubricant to a three-phase synchronous closed-loop cooled electric motor, see Table 5.25 [41].
5.5.3.7 Main Feeder
The main feeder consists of three parallel lines (one in reserve), their inlets and outlets interconnected. Each of the lines contains:
Solid particles are filtered out by an upright hermetic-vessel filter with a spherical cover, which can be removed to replace the bed. Water flows in 500 mm diameter pipes welded to the main pipelines. Three more end-pieces of 10 mm diameter expel the air and maintain a proper pressure drop in the filtering bed. The upper part of filter is equipped with a removable grid and exchangeable filter bed, and one more removable pipe which feeds the water to the upper part to be filtered in downward flow. All these units must be replaced whenever the pressure drop across the filter reaches to 0.3 MPa, as seen in Table 5.26.
The control valves maintain proper levels of water in the separator drums. The option for manual operation of these valves is available from the MCR. Some details of the control valve are given in Table 5.27.
Check valves exclude inverse flow from the separator drums in a failure of the feed-water piping somewhere between the suction pump and the valve. The gate valves disconnect any pipe on the failure of:
The gate valves are operated from the MCR.
5.5.3.8 Auxiliary Feeder
The AFWPs feeds water into the separator drum via two pipes (219 x 13) mm and are connected into the feedwater
Table 5.26 Specifications of the filter (type-2200.T6.76TU)
|
Number per reactor |
6 |
|
Capacity at 4200 MW (th) power, kg/s |
514-531 |
|
Nominal volume, m3 |
2 |
|
Filtration surface area, m2 |
9.11 |
|
Actual filtration surface area, m2 |
0.723 |
|
Pressure drop in a clear filter, MPa |
0.057 |
|
Admissible pressure drop, MPa |
0.3 |
|
Minimum size of removed particles, mm |
0.1 |
|
Operation absolute pressure, MPa |
11.8 |
|
Operation temperature, oC |
190 |
|
Mass of the filter bed, kg |
15 |
|
Heating and cooling rate, oC/h |
120 |
|
Admissible wall temperature, oC |
200 |
|
Nominal pipe diameter, mm |
500 |
|
Overall dimensions, mm: |
|
|
- length |
2190 |
|
- width |
1610 |
|
- height |
3550 |
|
Mass, kg |
12800 |
|
Reliability: |
|
|
- average time between major servicing, h |
80000 |
|
- lifetime, years |
30 |
|
- admissible overload cycles in lifetime |
< 600 |
piping downstream of the main feeder. The auxiliary pumps supplies the water to the emergency feeder which contains:
The equipment operates in the same manner, as the respective equipment in the main feeder, but for their operation parameters. The characteristic of filter and control valve are present in Tables 5.28, 5.29.
5.5.3.9 Mixers
Feedwater piping includes mixers for the feedwater and the return by-pass water from PCS to prevent thermal shocks when purified cooled water is supplied into the hot feedwater piping. Some details of the mixer are given in Table 5.30.
5.5.3.10 Valves in the Feedwater Piping
All valves are manufactured in the Tchechovskoj plant of energy engineering and some valves come from the former Czechoslovakia. Most important among them are control valves in the pressure piping of both the main and the emergency pumps. They ensure reliable operation of the pumps in their parameter ranges even with underpressure in the suction header. Details are given in Table 5.31. Similar type 1046-250E control valves are installed i n the pressure piping of the auxiliary feed water pumps, they are specified in Table 5.29.
Table 5.27 Specifications of the control valve (type - 1046-500-E1, manufacturer - Tchechovskoj Plant of Energy Engineering, Russia) for main feeder
|
Number per reactor |
6 |
|
Nominal flow diameter, mm |
500 |
|
Operation pressure, MPa |
11.8 |
|
Operation temperature, oC |
190 |
|
Pressure drop, MPa |
1.0 |
|
Maximum shaft torque, N.m |
900 |
|
Control unit: |
|
|
- type |
876-E-0-05 |
|
- power, kW |
4.3 |
|
Complete closing and opening time, s |
80 |
|
Mass, kg |
2550 |
Table 5.28 Specification of the filter (type - 550.T6.77TU)
|
Number per reactor |
2 |
|
Capacity, kg/s |
153 |
|
Nominal diameter of end pieces, mm |
250 |
Table 5.29 Specification of the control valve (type - 1046-250-E, manufacturer - Tchechovskoj Plant of Energy Engineering, Russia) for auxiliary feeder
|
Nominal flow diameter, mm |
250 |
|
Operational absolute pressure, MPa |
11.8 |
|
Operational temperature, oC |
250 |
|
Pressure drop, MPa |
0.98 |
|
Maximum shaft rotational moment, N× m |
470 |
|
Control unit: |
|
|
- type |
793-ER-02-02 |
|
- power, kW |
1.7 |
|
Complete closing and opening time, s |
53 |
|
Mass of equipment, kg |
737 |
Table 5.30 Specification of the mixer
|
Number per reactor |
4 |
|
Outlet (feedwater) flow rate, kg/s |
514-531 |
|
Temperature of feedwater, oC |
177-190 |
|
Flow rate of purified water, kg/s |
£ 27.8* |
|
Temperature of purified water, oC |
30-245 |
|
Nominal pressure, MPa |
7.4 |
* At 4200 MW (th) power