Norm

ASTM C781 - 08 en

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

  • Deze norm is ingetrokken sinds 01-05-2014

50,60 61,23 Incl BTW

Over deze norm

Status Ingetrokken
Aantal pagina's 10
Gepubliceerd op 01-09-2008
Taal Engels

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.

Details

ICS-code 27.120.10
Engelse titel Standard Practice for Testing Graphite and Boronated Graphite Materials for High-Temperature Gas-Cooled Nuclear Reactor Components
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