ASTM-C781:2008 Edition

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C781-08 Standard Practice for Testing Graphite and Boronated Graphite Materials for High-Temperature Gas-Cooled Nuclear Reactor Components

Published By	Publication Date	Number of Pages
ASTM	2008	10

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Categories: 27.120.10 - Reactor engineering, ASTM

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Description

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.

^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.

^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.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Significance and Use TABLE 1 TABLE 2
3	Sample Selection Test Reports Description and Function
4	Test Methods Description and Function
5	Test Methods for Boronated Graphite Keywords A1. QUALIFICATION CTE TEST FOR CALCINED COKE A1.1 Scope A1.2 Sampling A1.3 Procedure
6	A1.4 Measuring the Coefficient of Thermal Expansion A1.5 Report A1.6 Precision and Bias A2. BULK DENSITY OF NON-UNIFORM TEST SPECIMENS A2.1 A2.2 A3. ESTIMATION OF THE GRAPHITIZATION TEMPERATURE OF FULL-SIZE BILLETS FROM THE MEASURED SPECIFIC ELECTRICAL RESISTIVITY A3.1 A3.2 Procedure A3.3 Precision and Bias
7	A4.1 A4.2 Test Specimen A4.3 Specimen Connectors A4.4 Attachment of Test Specimens to Specimen Connectors A4.5 Test Procedures A4.6 Tensile Property Calculations A4.7 Precision and Bias A5.1 A5.2 Note 3 A5.3 A5.4
8	A5.5 A5.6 A6. DETERMINATION OF THERMAL CONDUCTIVITY FROM THERMAL DIFFUSIVITY A6.1 A6.2 TABLE A6.1
9	A7. PREPARATION OF SOLUTIONS FOR DETERMINATION OF BORON CONTENT BY CALCINATION AND ICP-OES A7.1 Scope A7.2 Significance and Use A7.3 Summary of Test Method A7.4 Apparatus A7.5 Reagents A7.6 Sample Preparation A7.7 Preparation of Apparatus
10	A7.8 Procedure A8.1

Additional information

Apparent Porosity	C1039
Poisson s Ratio	E132 B
Hafnium Concentration	C
Permeability	C577 A , B
Electrical Resistivity	C611
Compressive Strength	C695 A
Impact Performance	B
As Manufactured Bulk Density	C838
Relative Oxidation Rate	C
Boron Analysis:
Mechanical Strength:
Modulus of Elasticity	C747
Ash Content	C561 A
Physical Properties
Linear Thermal Expansion	A
Bulk Density Machined Specimens	C559
Boron as Oxide	C
Particle Size	C
Mechanical Properties
Chemical Properties:
Thermal Properties
B 4 C Particle Size	D2862 D
Bulk Density	C838
Tensile Properties	C749 A
Thermal Conductivity	E1461 A
Fabrication
Oxidative Mass Loss	C1179 B
Surface Area (BET)	C1274
Flexural Strength	C651 A
Spectroscopic Analysis	B
Sulfur Concentration	C
Equivalent Boron Content	C1233 A
Fracture Toughness	B
ICS Codes	27.120.10 - Reactor engineering
Total Boron	C

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ASTM-C781:2008 Edition

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