ASTM C781 - 08

    Standard Practice for Testing Graphite and Boronated Graphite Materials for High-Temperature Gas-Cooled Nuclear Reactor Components

    Active Standard ASTM C781 | Developed by Subcommittee: D02.F0

    Book of Standards Volume: 05.05


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    ASTM C781

    Significance and Use

    Property data obtained with the recommended test methods identified herein may be used for research and development, design, manufacturing control, specifications, performance evaluation, and regulatory statutes pertaining to high temperature gas-cooled reactors.

    The test methods are applicable primarily to specimens in the non-irradiated and non-oxidized state. Many are also applicable to specimens in the irradiated or oxidized state, or both, provided the specimens meet all requirements of the test method. The user is cautioned to consider the instructions given in the test methods.

    Additional test methods are in preparation and will be incorporated. The user is cautioned to employ the latest revision.

    1. Scope

    1.1 This practice covers the test methods for measuring the properties of graphite and boronated graphite materials. These properties may be used for the design and evaluation of high-temperature gas-cooled reactor components.

    1.2 The test methods referenced herein are applicable to materials used for replaceable and permanent components as defined in Section 7 and Section 9, and includes fuel elements; removable reflector elements and blocks; permanent side reflector elements and blocks; core support pedestals and elements; control rod, reserve shutdown, and burnable poison compacts; and neutron shield material.

    1.3 This practice includes test methods that have been selected from existing ASTM standards, ASTM standards that have been modified, and new ASTM standards that are specific to the testing of materials listed in 1.2. Comments on individual test methods for graphite and boronated graphite components are given in Sections 8 and 10, respectively. The test methods are summarized in Tables 1 and 2.

    1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

    1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    TABLE 1 Summary of Test Methods for Graphite Components

    Note—Designations under preparation will be added when approved.

    Fuel, Removable Reflector,
    and Core Support Elements;
    Pebble Bed Reflector,
    Key and Sleeves;
    and Dowel Pins
    Permanent Side
    Reflector Elements
    and Dowel Pins
    Core Support Pedestals
    and Dowels
    Fabrication
    As Manufactured Bulk DensityC838C838C838
    Mechanical Properties
    Compressive StrengthC695C695C695
    Tensile PropertiesC749AC749AC749A
    Poissons RatioE132BE132BE132B
    Flexural StrengthC651AC651AC651A
    Fracture ToughnessBBB
    Modulus of ElasticityC747C747C747
    Physical Properties
    Bulk DensityMachined SpecimensC559C559C559
    Surface Area (BET)C1274C1274C1274
    PermeabilityC577A,BC577A,BC577A,B
    Apparent PorosityC1039C1039C1039
    Spectroscopic AnalysisBBB
    Electrical ResistivityC611C611C611
    Thermal Properties
    Linear Thermal ExpansionE228A
    Thermal ConductivityE1461AE1461AE1461A
    Chemical Properties
    Oxidative Mass LossC1179BC1179BC1179B
    Sulfur ConcentrationC816C816C816
    Ash ContentC561AC561AC561A
    Equivalent Boron ContentC1233AC1233AC

    A Modification of this test method is required. See Section 8 for details.

    B New test methods are required. See Section 8 for details.

    C There is no identified need for determining this property.

    TABLE 2 Summary of Test Methods for Boronated Graphite Components

    Note—Designations under preparation will be added when approved.

    CompactsNeutron
    Shield
    Material
    Control
    Rod
    Burnable
    Poison
    Reserve
    Shutdown
    Bulk DensityC838C838C838D4292
    Linear Thermal ExpansionAE228AE228AB
    Particle SizeCCCD2862
    Mechanical Strength:
    Compressive StrengthC695AC695AC695AB
    Impact PerformanceBBBC
    Chemical Properties:
    Sulfur ConcentrationCCCC
    Hafnium ConcentrationCCCC
    Relative Oxidation RateCCCC
    Boron Analysis:
    Total BoronCCCC
    Boron as OxideCCCC
    B4C Particle SizeD2862DD2862DD2862DD2862D

    A Modification of this test method is required. See Section 10 for details.

    B There is no identified need for determining this property.

    C New test methods are required. See Section 10 for details.

    D Additional test methods are required. See Section 10 for details.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C559 Test Method for Bulk Density by Physical Measurements of Manufactured Carbon and Graphite Articles

    C561 Test Method for Ash in a Graphite Sample

    C577 Test Method for Permeability of Refractories

    C611 Test Method for Electrical Resistivity of Manufactured Carbon and Graphite Articles at Room Temperature

    C625 Practice for Reporting Irradiation Results on Graphite

    C651 Test Method for Flexural Strength of Manufactured Carbon and Graphite Articles Using Four-Point Loading at Room Temperature

    C695 Test Method for Compressive Strength of Carbon and Graphite

    C709 Terminology Relating to Manufactured Carbon and Graphite

    C747 Test Method for Moduli of Elasticity and Fundamental Frequencies of Carbon and Graphite Materials by Sonic Resonance

    C749 Test Method for Tensile Stress-Strain of Carbon and Graphite

    C769 Test Method for Sonic Velocity in Manufactured Carbon and Graphite Materials for Use in Obtaining Youngs Modulus

    C816 Test Method for Sulfur in Graphite by Combustion-Iodometric Titration Method

    C838 Test Method for Bulk Density of As-Manufactured Carbon and Graphite Shapes

    C1039 Test Methods for Apparent Porosity, Apparent Specific Gravity, and Bulk Density of Graphite Electrodes

    C1179 Test Method for Oxidation Mass Loss of Manufactured Carbon and Graphite Materials in Air

    C1233 Practice for Determining Equivalent Boron Contents of Nuclear Materials

    C1274 Test Method for Advanced Ceramic Specific Surface Area by Physical Adsorption

    D346 Practice for Collection and Preparation of Coke Samples for Laboratory Analysis

    D1193 Specification for Reagent Water

    D2854 Test Method for Apparent Density of Activated Carbon

    D2862 Test Method for Particle Size Distribution of Granular Activated Carbon

    D3104 Test Method for Softening Point of Pitches (Mettler Softening Point Method)

    D4292 Test Method for Determination of Vibrated Bulk Density of Calcined Petroleum Coke

    D5600 Test Method for Trace Metals in Petroleum Coke by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)

    D7219 Specification for Isotropic and Near-isotropic Nuclear Graphites

    E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves

    E132 Test Method for Poissons Ratio at Room Temperature

    E228 Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer

    E261 Practice for Determining Neutron Fluence, Fluence Rate, and Spectra by Radioactivation Techniques

    E639 Test Method for Measuring Total-Radiance Temperature of Heated Surfaces Using a Radiation Pyrometer

    E1461 Test Method for Thermal Diffusivity by the Flash Method


    ICS Code

    ICS Number Code 27.120.10 (Reactor engineering)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/C0781-08

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