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Current and future nuclear power reactors and plants 147

Table 4.9 Continued
No. Parameter BN-600 BN-800 BN-1200
8 Temperature of power- 240/505 210/490 275/510
cycle working fluid: water/
steam—T in /T out (°C)
9 Pressure at steam-generator 13.7 14.0 17.0
outlet (MPa)
10 Scheme of steam Sodium Steam Steam
reheat with
11 Basic unchangeable 30 40 60
components service term
(years)
12 Number of fuel assemblies 371 565 432
13 Fuel enrichment (%) 17; 21; 26 20; 22; 25 –
(for MOX)
14 Average fuel burnup 70 70–100 up to 138
1
(MWday (kg) )
15 Continues reactor operation 120–170 155 330
between refueling intervals
(eff. days)
16 NPP thermal efficiency 42.5 41.9 43.6
(gross) (%)
17 NPP thermal efficiency 40.0 38.8 40.5
(net) (%)
18 Plant capacity factor 0.77–0.8 0.85 0.9
19 Service life (years) 45 45 60

a
BN-600 and BN-800 are currently in operation at the Beloyarsk NPP; BN-600 commercial start—1981
and BN-800—2015.
b
BN-1200—Generation IV concept of future Russian SFR.
1
and (c) maximum single-channel mass-flow rate 28.5kgs ; (8) online refueling; and
(9) power cycle—subcritical-pressure regenerative Rankine steam-turbine cycle with
steam reheat (working fluid light water; turbine: one High-Pressure (HP) and two
double-flow Low-Pressure (LP) cylinders; net thermal output 2080MW th ; gross/net
electrical output (nominal) 740/690MW el ; turbine steam-inlet parameters: saturation
pressure 4.69MPa and temperature 260°C; feedwater: 5.8MPa (T sat ¼273.4°C) and
187°C; also, condenser backpressure ranges from 3.74 to 4.9kPa depending on con-
denser cooling temperature. The T-s diagram for an older CANDU reactor at the Pick-
ering NPP (i.e., lower steam parameters compared with those of the EC6 reactor) is
shown in Fig. 4.17.
A simplified layout of the PHWR NPP (Siemens design, Atucha, Argentina) is
shown in Fig. 4.18. This is the PHWR design that uses a reactor vessel as the
reactor-coolant pressure boundary with fuel channels inside, while the CANDU-type
of PHWR uses the pressure tube in a fuel channel as the pressure boundary. (For
PHWRs operated in India, see reference [1].)