“ mechanical properties of nuclear grade graphite at high temperatures and pressures ”

“Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures” By: Matt Luedeman, Peter Wells, Chris Dyke Advisor: Jay McCormack Clients: Dr. Karl Rink Dr. Gabriel Potirniche Dr. Akira Tokuhiro 1

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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 Presentation

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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

Overview Problem Overview

Testing Procedures

Vessel Design

Budget

Future Plans

Questions

Page 3: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

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

Page 4: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

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.

Page 5: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Testing Procedures

Young’s Modulus

Page 6: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Testing Procedures

Shear Modulus

Page 7: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Testing ProceduresCoefficients of Friction Kinetic Static

Page 8: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Vessel Design

Vessel Requirements Dimensions Heating Source Viewing Window Electrical Input Safety Access

Page 9: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Vessel Sizing

Vessel needs to be large enough to conduct experiments for: Our testing procedures Graduate student experimentation Future experiment or design

implementations

Page 10: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Vessel Sizing Cont.Our proposed vessel will have:

ID = 12 inches L = 12 inches The thickness will depend on the

temperature of the steel

Page 11: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

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

Page 12: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

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

Page 13: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Immersion Heaters

ApplicationBenefitsDisadvantages

Page 14: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

NiCr HeatingFiber Insulated Heater from Zircar Ceramics:

Custom Size Insulation included Time to heat Temperature Control

Page 15: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

According to the ASMEstandards for pressurevessel design

Fiber insulated heatertemperature graph fromZircar Ceramics

Vessel Thickness

Page 16: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Viewing Window

We need a viewing window for: Conducting Testing Observing Equipment

Design Factors: High Flexural Strength Known energy deflection characteristics

Page 17: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Electrical Input Required to allow for internal input of wiring Power feed-through must be rated to

withstand: Pressure Temperature of outside of insulation

Page 18: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Safety

Vessel will need: Pressure Relief Valves Design Safety Factor To Comply with ASME Regulations

Page 19: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Access

Vessel needs to have access in order to: Vary experiment setup Perform Maintenance on Heating Unit

Page 20: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Page 21: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Budget

Item Cost ($)Stainless Steel 800-3000Fiber Insulated Heater 1000Power Supply 700Feed-Throughs 500Labor 200-750Window 200Other 1000

Total (approximately) 4200 - 7000

Page 22: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Future Plans

Finalize Vessel Design Viewing Window Vessel Thickness Insulation Shape

Order Materials Assemble Vessel Test Apparatus Perform Mechanical Testing in Vessel

(Time Permitting)

Page 23: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Page 24: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Page 25: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

CATIA Rendering of Vessel

Page 26: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Vessel Thickness

Page 27: “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”

Power Input Calculation

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