Technology and Operation - Kernkraftwerk Gösgen

Key technical data
Power
Gross electrical output 1035 MW
Net electrical output 985 MW
Thermal reactor output 3002 MW
Reactor building
Outside diameter 63.6 m
Height above base plate 56.8 m
Wall thickness in the cylindrical part 1.6 m
Wall thickness in the dome 1.2 m
Thickness of base plate 2.8 m
Steel containment structure
Inside diameter 52 m
Wall thickness 32 mm
Design overpressure/temperature 4.89 bar/135°C
Reactor pressure vessel
Inside diameter 4360 mm
Wall thickness of cylindrical shell (without cladding) 221 mm
Material 22NiMoCr3-7
Cladding thickness 6 mm
Total height including closure head 10,827 mm
Design pressure/temperature 175 bar/350°C
Weight without internal structures 360 t
Weight of core internal structures 135 t
Reactor
Coolant and moderator H2O
Fuel uranium (UO2) and Mox (UO2 and PuO2)
Number of fuel assemblies 177
Overall weight per assembly 666 kg
Fuel rods per fuel assembly 205 (Mox: 204)
Arrangement square lattice configuration
Overall length of fuel rods 3860 mm
Active fuel length of a rod 3550 mm
Outer diameter of fuel rods 10.75 mm
Cladding tube material Zry-4/DX ELS 0.8
Cladding tube wall thickness 0.725 mm
Total uranium weight in core 76 t
Enrichment reload fuel assemblies 4.6–4.95 % U-235 equivalent
Average burnup at discharge 55–65 MWd/kg HM
Average heat flux density 67.5 W/cm 2
Average linear power 228 W/cm
Number of control assemblies 48
Absorber rods per control assembly 20
Absorber material AgInCd
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