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Advanced Test Reactor
ATR vs Commercial Reactor
• Confinement Structure• Operating Conditions– 390 psi– 140 degrees F
• Reactor Core– 4 feet x 4 feet– 880 pounds– 21 pounds of uranium
• Containment Structure• Operating Conditions– 2600 psi– 550 degrees F
• Reactor Core– 12 feet x 15 feet– 154 tons– 12,000 pounds of uranium
Commercial Reactor
ATR
ATR Timeline
Start ofOperations
(6 loops 1967)
2nd Core InternalsChangeout (CIC)
1977
9th Loop Facility Installed, Improved Loop Capabilities 1980
Lead ExperimentFacility Installed
1984
Reactor ControlRoom Replaced
1989
3rd Core InternalChangeout (CIC)
1986
Process Control RoomReplaced & Core Reconfigured
1993
Loop Control SystemReplaced & 4th Core Internal
Changeout (CIC)Decreased Active Loops to 5
1994 External Secondary Piping& Cooling Tower Replacement
1998
Irradiation TestVehicle (ITV) Installed
1999
5th Core InternalChangeout (CIC)
20046th Core Internal
Changeout (CIC) 2010
1967 1987 1997 2007
1st Core Internals Changeout (CIC) 1972
1977
Increased number of loops
from 6 to 8 1973
Plant Protective System Upgrade
2006
ATR Specifications
• Reactor Type
– Pressurized, light-water moderated and cooled, beryllium reflector
• Reactor Vessel
– 3.65 m diameter cylinder, 10.67 m high
– Stainless steel
• Reactor Core
– 1.22 m (diameter & height)
– 40 fuel elements, high enriched U-235
ATR Specifications (continued)
• Coolant Inlet Temperature & Pressure
– 52°C, 2450 kPa
• Thermal Power & Flux
– Maximum Total Core Power – 250MW
– Approximate Peak Flux Values (Unperturbed)
• 1 x 1015 n/cm2–sec thermal
• 5 x 1014 n/cm2-sec fast
ATR Specifications (continued)
• Hafnium Reactivity Control Drums/Rods
– Maintains Axial Flux Shape During Operating Cycle
– Flux/Power Adjustments Among Core Lobes/Flux Traps
• Irradiation Facilities 77
– Reflector Positions 68
– Flux Traps 4
– In-pile Tubes 5
b
Outer Shim Control Cylinder
“B” Position
Fuel Element
Neck Shim Rod(1-6 Typical)
MICE
Inboard “A” Position(1-8)
Outboard “A” Position(9-16)
Standard Loop Irradiation Facility
“I” Position
Outer South Irradiation Tank
South and East Flux Trap
Irradiation Facilities
Safety Rod
“H” Position
Large Loop Irradiation Facility
ITV
Outer North Irradiation Tank
H9
H1
H5H13
H8
H7
H6
H11
H10
H12
H15
H14
H16 H2
H3
H4
31
2
45
17 23
6
M-1
M-3M-2
M-3
ATR Core Cross Section
ATR Vessel & Internals
Irradiation Test Vehicle
ATR Standard Loop Layout
Ion Exchange
Columns
Operating Console
Pumps
PressurizerLine Heaters
Reactor Core
Loop Closure Plugs
Loop Inlet and Outlet Piping
Heat Exchanger