ASTM C1076-09

Standard Specification for Nuclear Grade Hafnium Oxide Pellets

ABSTRACT
This specification covers the properties and requirements for pellets of stabilized cubic hafnium oxide used in nuclear reactors. Hafnium oxide should consist of a stabilizing agent, the recommended of which is yttrium oxide, though others such as calcium oxide and magnesium oxide may also be used as agreed upon by the buyer and seller. The material shall meet specified values of the following requirements: physical dimensions; density; mechanical properties; phase stabilization; impurity concentration limits; moisture concentration limit; visual appearance; end and circumferential chips; cracks; and fissures and other defects.
SCOPE
1.1 This specification applies to pellets of stabilized cubic hafnium oxide used in nuclear reactors.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

General Information

• Status: Historical
• Publication Date: 30-Jun-2009
• Technical Committee: C26 - Nuclear Fuel Cycle
• Drafting Committee: C26.03 - Neutron Absorber Materials Specifications

Relations

• Replaces: ASTM C1076-97(2004) - Standard Specification for Nuclear Grade Hafnium Oxide Pellets
• Effective Date: 01-Jul-2009

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C1076 −09
StandardSpecification for
1
Nuclear Grade Hafnium Oxide Pellets
This standard is issued under the fixed designation C1076; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.3 pellet—fabricated geometric shape of stabilized cubic
hafnium oxide having a chemical composition as described in
1.1 This specification applies to pellets of stabilized cubic
Section 4.
hafnium oxide used in nuclear reactors.
3.1.4 pellet lot—the pellets produced from one hafnium
1.2 The values stated in SI units are to be regarded as the
oxidepowderlotusingonesetofprocessparameters.Pelletlot
standard. The values given in parentheses are for information
size shall be agreed upon between the seller and the buyer.
only.
3.1.5 phase transformation—rearrangement of the atomic
ordering of a crystalline lattice as a material is cycled through
2. Referenced Documents
a critical transformation or inversion temperature. The change
2
2.1 ASTM Standards:
from one crystalline phase to another may be accompanied by
C559 Test Method for Bulk Density by Physical Measure-
a volume change that could lead to cracks or defects in articles
ments of Manufactured Carbon and Graphite Articles
5,6
fabricated from such materials.
C859 Terminology Relating to Nuclear Materials
3.1.6 powder lot—a specified quantity of hafnium oxide
C1098 Specification for Nuclear-Grade Hafnium Oxide
powder with stabilizing additive, blended together such that
Powder
samples taken in accordance with Section 7 can be considered
E105 Practice for Probability Sampling of Materials
as representative of the entire quantity.
3
2.2 ANSI Standard:
3.1.7 seller—hafnium oxide pellet supplier.
ANSI/ASME NQA-1 Quality Assurance Requirements for
3.1.8 stabilizing additive—a material which, when present
Nuclear Facility Applications
4 insufficientconcentrationinthesubjectmaterialexhibitingthe
2.3 U.S. Government Document:
phase transformation, produces a stabilized crystalline phase
Code of Federal Regulations, Title 10, Part 50—Energy
that does not undergo a transformation or inversion at any
(10CFR 50) Domestic Licensing of Production and Utili-
temperature within the expected fabrication or usage regime of
zation Facilities
the manufactured pellet. The potentially deleterious volume
change is therefore avoided.
3. Terminology
3.1 Definitions:
4. Chemical Composition
3.1.1 Terms shall be defined in accordance with Terminol-
4.1 The starting hafnium oxide powder shall be in accor-
ogy C859 except for the following:
dance with Specification C1098.
3.1.2 buyer—organization issuing the purchase order.
4.2 Astabilizing additive shall be utilized with the hafnium
oxide. The recommended stabilizing additive is yttrium oxide
(Y O ). The typical concentration range is 7 to 10 weight %
1
2 3
This specification is under the jurisdiction of ASTM Committee C26 on
Y O in the finished product. References to other stabilizing
Nuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.03 on
2 3
Neutron Absorber Materials Specifications.
additives (such as calcium oxide (CaO) and magnesium oxide
Current edition approved July 1, 2009. Published August 2009. Originally
(MgO)) may be found in the literature and these additives may
approved in 1987. Last previous edition approved in 2004 as C1076 – 97 (2004).
be used if agreed upon by the buyer and seller. It is cautioned,
DOI: 10.1520/C1076-09.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Sevice at [e-mail]. For Annual Book of ASTM
Standardsvolume information, refer to the standard’s Document Summary page on
5
the ASTM website. Curtis, C. E., Doney, L. M., and Johnson, J. R., “Some Properties of
3
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St., Hafnium-Oxide, Hafnium-Silicate, Calcium-Hafnate, and Hafnium-Carbide,” Jour-
4th Floor, New York, NY 10036, http://www.ansi.org. nal of American Ceramics Society , Vol 37, 1954, pp. 458–465.
4 6
AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments, Brown, L. M., and Madiyasni, K. S., “Characterization of Alkoxy-Derived
732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http:// Yttria-Stabilized Hafnia,” Journal of American Ceramics Society, Vol 53, 1970, pp.
www.access.gpo.gov. 590–594.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1076−09
however, that the buyer should be aware of potential destabi- the seller. The method of density mea
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:C1076–97 (Reapproved 2004) Designation: C 1076 – 09
Standard Specification for
1
Nuclear Grade Hafnium Oxide Pellets
This standard is issued under the fixed designation C 1076; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification applies to pellets of stabilized cubic hafnium oxide used in nuclear reactors.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
2. Referenced Documents
2
2.1 ASTM Standards:
C 559 Test Method for Bulk Density by Physical Measurements of Manufactured Carbon and Graphite Articles
C 859 Terminology Relating to Nuclear Materials
C 1098 Specification for Nuclear-Grade Hafnium Oxide Powder
E 105 Practice for Probability Sampling ofOf Materials
3
2.2 ANSI Standard:
ANSI/ASME NQA-1 Quality Assurance Program Requirements for Nuclear Facility Applications
4
2.3 U.S. Government Document:
Code of Federal Regulations, Title 10, Part 50—Energy (10CFR 50) Domestic Licensing of Production and Utilization
Facilities
3. Terminology
3.1 Definitions—Terms shall be defined in accordance with Terminology C 859 except for the following:
3.1.1 buyer—organization issuing the purchase order.
3.1.2 pellet—fabricated geometric shape of stabilized cubic hafnium oxide having a chemical composition as described in
Section 4.
3.1.3 pellet lot—the pellets produced from one hafnium oxide powder lot using one set of process parameters. Pellet lot size
shall be agreed upon between the seller and the buyer.
3.1.4 phase transformation—rearrangement of the atomic ordering of a crystalline lattice as a material is cycled through a
critical transformation or inversion temperature. The change from one crystalline phase to another may be accompanied by a
5 ,6
volume change that could lead to cracks or defects in articles fabricated from such materials.
3.1.5 powder lot—a specified quantity of hafnium oxide powder with stabilizing additive, blended together such that samples
taken in accordance with Section 7 can be considered as representative of the entire quantity.
3.1.6 seller—hafnium oxide pellet supplier.
3.1.7 stabilizing additive—amaterialwhich,whenpresentinsufficientconcentrationinthesubjectmaterialexhibitingthephase
transformation, produces a stabilized crystalline phase that does not undergo a transformation or inversion at any temperature
within the expected fabrication or usage regime of the manufactured pellet.The potentially deleterious volume change is therefore
avoided.
1
This specification is under the jurisdiction of ASTM Committee C-26 C26 on Nuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.03 on Neutron
Absorber Materials Specifications.
Current edition approved May 10, 1997. Published May 1998. Originally published as C1076–87. Last previous edition C1076–87.
Current edition approved July 1, 2009. Published August 2009. Originally approved in 1987. Last previous edition approved in 2004 as C 1076 – 97 (2004).
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Sevice at [e-mail]. For Annual Book of ASTM
Standardsvolume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American National Standards Institute, 11 W. 42nd St., 13th Floor, New York, NY 10036.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Available from Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402.
4
Available from U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
www.access.gpo.gov.
5
Curtis, C. E., Doney, L. M., and Johnson, J. R., “Some Properties of Hafnium-Oxide, Hafnium-Silicate, Calcium-Hafnate, and Hafnium-Carbide,” Journal of American
Ceramics Society , Vol 37, 1954, pp. 458–465.
6
Brown,L.M.,andMadiyasni,K.S.,“CharacterizationofAlkoxy-DerivedYttria-StabilizedHafnia,” Journal ofAmerican Ceramics Society,Vol53,1970,pp.590–594.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C1076–09
4. Chemical Comp
...