“ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”
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Transcript of “ Mechanical Properties of Nuclear Grade Graphite at High Temperatures and Pressures ”
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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. Akira Tokuhiro
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Overview Problem Overview
Testing Procedures
Vessel Requirements
Heating Components
Vessel Sizing
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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Project GoalsTwo 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
Shear Modulus
Coefficients of Friction
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Vessel Requirements
Vessel Requirements Temperature: 700 C Pressure: 7 MPa Testing Space: 12” Diameter, 12” Length Room for Heater Viewing Window
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HeaterFiber Insulated Resistance Wire Heater from
Zircar Ceramics: Custom Size: 16” Length, 16” OD Insulation included Time to heat Temperature Control
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Temperature ControlVariable transformer:
Varies power to heaterControls heater temperatureThermocouples used to take temperature readings
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Electrical Input Provide power to heater while still keeping seal Power feed-through must be rated to
withstand: Pressure Temperature of outside of insulation
Insulated standoff used
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Vessel SizingCylinder Requirements:
18” L, 16” IDThickness dependent on temperature and pressure
FlangesStandard Size to fit on Cylinder
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According to the ASMEstandards for pressurevessel design a 5/8” cylinder thickness was required
Fiber insulated heatertemperature graph fromZircar Ceramics
Cylinder Thickness
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Flanges
Slip-On Flanges Size based on standard flange size to fit
around pipeBlind Flanges
A thickness of 3.25” was chosen based on the temperature and pressure they will see
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Bolts/Gaskets 20 Bolts are used on each side of
the vessel Special high temperature gaskets
are used to seal the vessel
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FEA
In order to analyze the stresses seen by each component of the vessel, a computer simulation was performed using finite element analysis software.
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Viewing Window/Burst Disk
We need a viewing window for: Conducting Testing Observing Equipment
A burst disk will be added for safety purposes
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Future Plans
Fabricate burst disk and windowPerform Hydrostatic assessmentComplete temperature analysis to
determine requirements for insulation
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