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Plant Specific Data

Vermont Yankee Unit # (504 MWe)

• Fuel and Cladding
• Fuel Assemblies
• Core Configuration
• Control System
• Primary Coolant
• Coolant Systems
• Turbines
• Vessel and Containment
• Reactor Operations
• Spent Fuel Management

Last Update: 01/97

Fuel and Cladding

Fuel	UO2 pellet
Cladding	Zr-2
Enrichment	Initial: 2.19 % Reload: 3.35 %
Clad Thickness	0.812 mm
Maximum Clad Temperature	302 deg C
Maximum Centerline Temperature	2450 deg C

Fuel Assemblies

Assembly Model	Initial Core: GE 7x7 Reloads: GE 98 P8DWB
Number of Rods per Assembly	61
Fuel Rod Pitch	1.63 cm
Total Number of Assemblies	368
Fuel Assembly Pitch	15.7 cm
Geometry	8x8

Core Configuration

Active Core Height	3.81 m
Active Core Diameter	3.3 m
Fuel Inventory	65.4 tHM
Average Core Power Density	50.96 kWt/liter
Average Assembly Discharge Burnup	33760 MWd/tU
Peak Assemby Discharge Burnup	37900 MWd/tU
Number of Cycles to Full Burnup	3
Axial Blankets	no
Axially Zoned Fuel	yes
Axially Zoned Burnable Poisons	yes
Average Linear Fuel Rating	42.50 kW/m
Peak Linear Fuel Rating	47.20 kW/m

Control System

Control Rod Material	B4C/Hafnium/stainless steel
Control Rod Drive Type	hydraulic
Number of Fine Control Rods	89
Number of Rods Containing Burnable Poison	10
Burnable Poison Material	Gd2O3
Other Control Systems	burnable poison

Primary Coolant

Coolant Material	H2O
Pressure	71.3 kg/sq cm
Core Inlet Temperature	189 deg C
Core Outlet Temperature	288 deg C
Number of Primary Pumps	2
Total Mass Flow	1116 t/h

Coolant Systems

Number of Loops	2
Water Chemistry

Turbines

Number of Turbines	1
Turbine Speed	1800 rev/min
Turbine Rating	540 MWe
Stop Valve Pressure	66.8 kg/sq cm
Stop Valve Temperature	282 deg C

Vessel and Containment

Vessel Materialcarbon steel stainless steel clad Vessel Shapecylinder Height19.2 m Inner Diameter5.2 m Wall Thickness133 mm Clad Thickness4.76 mm Containment TypeMk 1 Containment Design Pressure3.9 kg/sq cm

Reactor Operations

Cycle Length	16 months
Normal Planned Outage Length	30 days
Fuel Loading	14.5 tHM/y
Fraction of Core Reloaded Each Cycle	33 %
Operational Strategy	End of Cycle Coastdown Power

Spent Fuel Management

Number of Operating Cycles Completed	18
Amount of Spent Fuel in Fuel Pool	387 tHM
Original Capacity of Pool	110 tHM
Pool Capacity Increase Strategy	478.0
Total Increase in Pool Capacity	Reracking %