“ mechanical properties of nuclear grade graphite at high temperatures and pressures ”
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By: Matt Luedeman, Peter Wells, Chris Dyke Advisor: Jay McCormack Clients: Dr. Karl Rink Dr. Gabriel Potirniche Dr. Akira Tokuhiro. “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”. Overview. Problem Overview - PowerPoint PPT PresentationTRANSCRIPT
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“Mechanical Properties of Nuclear Grade Graphite at High
Temperatures and Pressures”
By: Matt Luedeman, Peter Wells, Chris DykeAdvisor: Jay McCormackClients: Dr. Karl Rink Dr. Gabriel Potirniche Dr. Akira Tokuhiro
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Overview Problem Overview
Testing Procedures
Vessel Design
Budget
Future Plans
Questions
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Problem Overview
Purpose: The Next Generation Nuclear Power Plant (NGNP) uses a graphite pebble bed as a neutron moderator. Dust creation PEBBLES Code Unknown properties of nuclear grade graphite
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Problem Overview Cont.Two main parts:
Create testing procedures for finding Young’s/Shear Modulus, Poisson’s Ratio Static/Kinetic Coefficients of Friction.
Create a heated pressure vessel that can simulate the environment in a nuclear reactor.
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Testing Procedures
Young’s Modulus
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Testing Procedures
Shear Modulus
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Testing ProceduresCoefficients of Friction Kinetic Static
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Vessel Design
Vessel Requirements Dimensions Heating Source Viewing Window Electrical Input Safety Access
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Vessel Sizing
Vessel needs to be large enough to conduct experiments for: Our testing procedures Graduate student experimentation Future experiment or design
implementations
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Vessel Sizing Cont.Our proposed vessel will have:
ID = 12 inches L = 12 inches The thickness will depend on the
temperature of the steel
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Heating Sources
Internal Heating Heats Specimen Quickly More Energy Efficient Simplifies Overall Design
External Heating Takes Longer to Heat Less Energy Efficient Creates Challenges for Experimentation
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Internal Heating
There is little excess energy used. Requires a temperature control unit
Variable voltage controller Two possible methods:
Flanged Immersion Heaters Sending a current through a wire
NiCr wiring
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Immersion Heaters
ApplicationBenefitsDisadvantages
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NiCr HeatingFiber Insulated Heater from Zircar Ceramics:
Custom Size Insulation included Time to heat Temperature Control
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According to the ASMEstandards for pressurevessel design
Fiber insulated heatertemperature graph fromZircar Ceramics
Vessel Thickness
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Viewing Window
We need a viewing window for: Conducting Testing Observing Equipment
Design Factors: High Flexural Strength Known energy deflection characteristics
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Electrical Input Required to allow for internal input of wiring Power feed-through must be rated to
withstand: Pressure Temperature of outside of insulation
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Safety
Vessel will need: Pressure Relief Valves Design Safety Factor To Comply with ASME Regulations
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Access
Vessel needs to have access in order to: Vary experiment setup Perform Maintenance on Heating Unit
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Budget
Item Cost ($)Stainless Steel 800-3000Fiber Insulated Heater 1000Power Supply 700Feed-Throughs 500Labor 200-750Window 200Other 1000
Total (approximately) 4200 - 7000
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Future Plans
Finalize Vessel Design Viewing Window Vessel Thickness Insulation Shape
Order Materials Assemble Vessel Test Apparatus Perform Mechanical Testing in Vessel
(Time Permitting)
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CATIA Rendering of Vessel
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Vessel Thickness
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Power Input Calculation