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Neutron Flux Measurements of the University of California, Irvine TRIGA Mark I Reactor
and Installation of a Flow
Loop Terminus Irradiation Port
Amber Hennessy October 9, 2015 TRTR
Reactor Characteristics
• First critical: November 1969
• Max power: 250 kW
• 4 control rods • 2 transient
• 2 mechanically driven
• 82 fuel elements • ~ 20% enriched
Facility Personnel
Reactor Supervisor
George Miller
Reactor Director
A.J.
Shaka
Senior Reactor Operator
Mikael Nilsson
Reactor Operator
Tro Babikian
Reactor Operator
Michael Gray
Assistant Reactor Supervisor
Jonathan Wallick
Reactor Operator
Alex Braatz
Senior Reactor Operator
Amber Hennessy
Reactor Operator
Raul Ocampo
Reactor Operator
Leila Safavi
Reactor Operator
Randy Ngelale
Irradiation Ports
• Central Thimble (CT)
• Rotatory Specimen Rack (LS)
• Pneumatic Transfer System (PT)
• Delayed Neutron System (DNS)
• Flow Loop Terminus (FLT)
FLT
Neutron Flux Using the Cd Ratio
• Gold Irradiated with and without Cadmium • Captures most neutrons
below about 0.3 eV
• ASTM standard
𝑅𝑅 =𝐴𝐴𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐴𝐴𝐶𝐶𝐶𝐶
ϕ𝑡𝑡𝑡 =𝐴𝐴𝑠𝑠𝑁𝑁σ𝑡𝑡𝑡
∗𝑅𝑅 − 1𝑅𝑅
• A = corrected
• R = Cd ratio
• N = # molecules of target
• 𝜎𝜎 𝑡𝑡𝑡= thermal cross section
Neutron Flux Height Profiling
• ~18 cm Au/Al wires
• 0.11% Gold
• Bare and Cd Covered
• 0.35 mm thick Cd
• Irradiated at 250 kW
• 30 min.
• CT and LS
Counting Setup
• Cut into ~ 0.7 cm pieces • 27 pieces total per each
wire
• 4 wires total
• Counted standing upright • Point source to detector
Wire
Reactor Components Surrounding the core
Center of the core
Flow Loop Terminus
• Located in the G ring
• Purpose: to look at recoil effects of irradiated target matrix
Flow Loop Terminus
• Series 1 high performance meter pump
• Clear urethane tubing
• Solvent flasks
• PEEK cup and tubing
Work completed by Leila Safavi-Tehrani
41Ar Production
• Open to air hollow aluminum tube with 25° bend
• 41Ar concerns due to its presence in air
• 6 hour irradiation at 250 kW
• Measurements throughout irradiation • Opening of the sample loop
• Mixing of the air in the sample loop
Work completed by Leila Safavi-Tehrani
FLT Dose Rates
Work completed by Leila Safavi-Tehrani
Special Thanks
Jonathan Wallick
Leila Savfavi-Tehrani
George Miller
Funding Agency
Nuclear Science and Security Consortium
Thank You!
Questions?