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  • ASTM
    C781-08 Standard Practice for Testing Graphite and Boronated Graphite Materials for High-Temperature Gas-Cooled Nuclear Reactor Components
    Edition: 2008
    $93.60
    Unlimited Users per year

Description of ASTM-C781 2008

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




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 Density C838 C838 C838
Mechanical Properties
Compressive Strength C695 C695 C695
Tensile Properties C749 A C749 A C749 A
Poisson s Ratio E132 B E132 B E132 B
Flexural Strength C651 A C651 A C651 A
Fracture Toughness B B B
Modulus of Elasticity C747 C747 C747
Physical Properties
Bulk Density Machined Specimens C559 C559 C559
Surface Area (BET) C1274 C1274 C1274
Permeability C577 A , B C577 A , B C577 A , B
Apparent Porosity C1039 C1039 C1039
Spectroscopic Analysis B B B
Electrical Resistivity C611 C611 C611
Thermal Properties
Linear Thermal Expansion E228 A
Thermal Conductivity E1461 A E1461 A E1461 A
Chemical Properties
Oxidative Mass Loss C1179 B C1179 B C1179 B
Sulfur Concentration C816 C816 C816
Ash Content C561 A C561 A C561 A
Equivalent Boron Content C1233 A C1233 A C

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.

Compacts Neutron
Shield
Material
Control
Rod
Burnable
Poison
Reserve
Shutdown
Bulk Density C838 C838 C838 D4292
Linear Thermal Expansion A E228 A E228 A B
Particle Size C C C D2862
Mechanical Strength:
Compressive Strength C695 A C695 A C695 A B
Impact Performance B B B C
Chemical Properties:
Sulfur Concentration C C C C
Hafnium Concentration C C C C
Relative Oxidation Rate C C C C
Boron Analysis:
Total Boron C C C C
Boron as Oxide C C C C
B 4 C Particle Size D2862 D D2862 D D2862 D D2862 D

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


Keywords

boronated graphite; chemical properties; graphite; high temperature gas-cooled nuclear reactor; mechanical properties; neutronic properties; physical properties; thermal properties; Boronated graphite; Carbon; Chemical analysis--nuclear materials; Core support blocks/posts/seats; Design--nuclear materials/applications; Graphite; High-temperature gas-cooled nuclear reactor; Neutronic properties; Nuclear graphite; Property data; Research and development applications; Thermal conductance/conductivity;


ICS Code

ICS Number Code 27.120.10 (Reactor engineering)


DOI: 10.1520/C0781-08

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ASTM C781

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ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.

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