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ASTM A20/A20M-20

(Specification)

Standard Specification for General Requirements for Steel Plates for Pressure Vessels

Standard Specification for General Requirements for Steel Plates for Pressure Vessels

ABSTRACT
This specification covers a group of common requirements that apply to rolled steel plates for pressure vessels. The steel shall be made in an open-hearth, basic-oxygen, or electric-arc furnace process. Sampling and methods for chemical analysis are discussed. Yield strength tests, tension tests, and notch-toughness tests shall be made in accordance to the product specification to conform to the specified requirements.
SCOPE
1.1 This general requirements specification2 covers a group of common requirements that, unless otherwise specified in the applicable product specification, apply to rolled steel plates for pressure vessels covered by each of the following product specifications issued by ASTM:    
Title of Specification  
ASTM DesignationA    
Pressure Vessel Plates, Alloy Steel, Nickel  
A203/A203M  
Pressure Vessel Plates, Alloy Steel, Molybdenum  
A204/A204M  
Pressure Vessel Plates, Alloy Steel, Manganese-
Vanadium-Nickel  
A225/A225M  
Stainless Chromium Steel-Clad Plate  
A263  
Stainless Chromium-Nickel Steel-Clad Plate  
A264  
Nickel and Nickel-Base Alloy-Clad Steel Plate  
A265  
Pressure Vessel Plates, Carbon Steel, Low- and
Intermediate-Tensile Strength  
A285/A285M  
Pressure Vessel Plates, Carbon Steel, Manganese-Silicon  
A299/A299M  
Pressure Vessel Plates, Alloy Steel, Manganese-
Molybdenum and Manganese-Molybdenum-Nickel  
A302/A302M  
Pressure Vessel Plates, Alloy Steel, Double-
Normalized and Tempered 9 % Nickel  
A353/A353M  
Pressure Vessel Plates, Alloy Steel, Chromium-
Molybdenum  
A387/A387M  
Pressure Vessel Plates, Carbon Steel, High Strength
Manganese  
A455/A455M  
Pressure Vessel Plates, Carbon Steel, for Intermediate-
and Higher-Temperature Service  
A515/A515M  
Pressure Vessel Plates, Carbon Steel, Moderate- and
Lower-Temperature Service  
A516/A516M  
Pressure Vessel Plates, Alloy Steel, High-Strength,
Quenched and Tempered  
A517/A517M  
Pressure Vessel Plates, Alloy Steel, Quenched and
Tempered, Manganese-Molybdenum and Manganese-
Molybdenum-Nickel  
A533/A533M  
Title of Specification  
ASTM DesignationA    
Pressure Vessel Plates, Heat-Treated, Carbon-
Manganese-Silicon Steel  
A537/A537M  
Pressure Vessel Plates, Alloy Steel, Quenched-and-
Tempered, Chromium-Molybdenum, and Chromium-
Molybdenum-Vanadium  
A542/A542M  
Pressure Vessel Plates, Alloy Steel, Quenched and
Tempered Nickel-Chromium-Molybdenum  
A543/A543M  
Pressure Vessel Plates, Alloy Steel, Quenched and
Tempered 7, 8, and 9 % Nickel  
A553/A553M  
Pressure Vessel Plates, Carbon Steel, Manganese-
Titanium for Glass or Diffused Metallic Coatings  
A562/A562M  
Pressure Vessel Plates, Carbon Steel, High Strength, for
Moderate and Lower Temperature Service  
A612/A612M  
Pressure Vessel Plates, 5 % and 51/2 % Nickel Alloy
Steels, Specially Heat Treated  
A645/A645M  
Pressure Vessel Plates, Carbon-Manganese-Silicon
Steel, for Moderate and Lower Temperature Service  
A662/A662M  
Pressure Vessel Plates, Carbon-Manganese-Silicon
Steel, Quenched and Tempered, for Welded Pressure
Vessels  
A724/A724M  
Pressure Vessel Plates, Low-Carbon Age-Hardening
Nickel-Copper-Chromium-Molybdenum-Columbium
(Niobium) Alloy Steel  
A736/A736M  
Pressure Vessel Plates, High-Strength Low-Alloy Steel  
A737/A737M  
Pressure Vessel Plates, Heat-Treated, Carbon-
Manganese-Silicon Steel, for Moderate and Lower
Temperature Service  
A738/A738M  
Pressure Vessel Plates, Alloy Steel, Chromium-
Molybdenum-Vanadium  
A832/A832M  
Steel Plates for Pressure Vessels, Produced by
Thermo-Mechanical Control Process (TMCP)  
A841/A841M  
Steel Plates, 9 % Nickel Alloy, for Pressure Vessels,
Produced by the Direct-Quenching Process  
A844/A844M  
Pressure Vessel Plates, Alloy Steel, Chromium-
Molybdenum-Tungsten  
A1017/A1017M  
1.1.1...

General Information

Status
Published
Publication Date
31-Oct-2020
ICS
23.020.30 - Pressure vessels, gas cylinders
77.140.50 - Flat steel products and semi-products
Technical Committee
A01 - Steel, Stainless Steel and Related Alloys
Drafting Committee
A01.11 - Steel Plates for Boilers and Pressure Vessels
Current Stage
Ref Project

Relations

Refers
ASTM A537/A537M-20 - Standard Specification for Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel
Effective Date
01-May-2020
Refers
ASTM A612/A612M-20 - Standard Specification for Pressure Vessel Plates, Carbon Steel, High Strength, for Moderate and Lower Temperature Service
Effective Date
01-May-2020

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Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A20/A20M −20
Standard Specification for
1
General Requirements for Steel Plates for Pressure Vessels
This standard is issued under the fixed designation A20/A20M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
A
1. Scope*
Title of Specification ASTM Designation
Pressure Vessel Plates, Heat-Treated, Carbon- A537/A537M
2
1.1 This general requirements specification covers a group
Manganese-Silicon Steel
of common requirements that, unless otherwise specified in the Pressure Vessel Plates, Alloy Steel, Quenched-and- A542/A542M
Tempered, Chromium-Molybdenum, and Chromium-
applicable product specification, apply to rolled steel plates for
Molybdenum-Vanadium
pressure vessels covered by each of the following product
Pressure Vessel Plates, Alloy Steel, Quenched and A543/A543M
specifications issued by ASTM: Tempered Nickel-Chromium-Molybdenum
Pressure Vessel Plates, Alloy Steel, Quenched and A553/A553M
A
Title of Specification ASTM Designation
Tempered 7, 8, and9%Nickel
Pressure Vessel Plates, Alloy Steel, Nickel A203/A203M
Pressure Vessel Plates, Carbon Steel, Manganese- A562/A562M
Pressure Vessel Plates, Alloy Steel, Molybdenum A204/A204M
Titanium for Glass or Diffused Metallic Coatings
Pressure Vessel Plates, Alloy Steel, Manganese- A225/A225M
Pressure Vessel Plates, Carbon Steel, High Strength, for A612/A612M
Vanadium-Nickel
Moderate and Lower Temperature Service
Stainless Chromium Steel-Clad Plate A263 1
Pressure Vessel Plates, 5 % and 5 ⁄2 % Nickel Alloy A645/A645M
Stainless Chromium-Nickel Steel-Clad Plate A264
Steels, Specially Heat Treated
Nickel and Nickel-Base Alloy-Clad Steel Plate A265
Pressure Vessel Plates, Carbon-Manganese-Silicon A662/A662M
Pressure Vessel Plates, Carbon Steel, Low- and A285/A285M
Steel, for Moderate and Lower Temperature Service
Intermediate-Tensile Strength
Pressure Vessel Plates, Carbon-Manganese-Silicon A724/A724M
Pressure Vessel Plates, Carbon Steel, Manganese-Silicon A299/A299M
Steel, Quenched and Tempered, for Welded Pressure
Pressure Vessel Plates, Alloy Steel, Manganese- A302/A302M
Vessels
Molybdenum and Manganese-Molybdenum-Nickel
Pressure Vessel Plates, Low-Carbon Age-Hardening A736/A736M
Pressure Vessel Plates, Alloy Steel, Double- A353/A353M
Nickel-Copper-Chromium-Molybdenum-Columbium
Normalized and Tempered9%Nickel
(Niobium) Alloy Steel
Pressure Vessel Plates, Alloy Steel, Chromium- A387/A387M
Pressure Vessel Plates, High-Strength Low-Alloy Steel A737/A737M
Molybdenum
Pressure Vessel Plates, Heat-Treated, Carbon- A738/A738M
Pressure Vessel Plates, Carbon Steel, High Strength A455/A455M
Manganese-Silicon Steel, for Moderate and Lower
Manganese
Temperature Service
Pressure Vessel Plates, Carbon Steel, for Intermediate- A515/A515M
Pressure Vessel Plates, Alloy Steel, Chromium- A832/A832M
and Higher-Temperature Service
Molybdenum-Vanadium
Pressure Vessel Plates, Carbon Steel, Moderate- and A516/A516M
Steel Plates for Pressure Vessels, Produced by A841/A841M
Lower-Temperature Service
Thermo-Mechanical Control Process (TMCP)
Pressure Vessel Plates, Alloy Steel, High-Strength, A517/A517M
Steel Plates, 9 % Nickel Alloy, for Pressure Vessels, A844/A844M
Quenched and Tempered
Produced by the Direct-Quenching Process
Pressure Vessel Plates, Alloy Steel, Quenched and A533/A533M
Pressure Vessel Plates, Alloy Steel, Chromium- A1017/A1017M
Tempered, Manganese-Molybdenum and Manganese-
Molybdenum-Tungsten
Molybdenum-Nickel
A
These designations refer to the latest issue of the respective specification which
appears in the Annual Book of ASTM Standards, Vol 01.04.
1.1.1 This general requirements specification also covers a
group of supplementary requirements that are applicable to
severaloftheaboveproductspecificationsasindicatedtherein.
Such requirements are provided for use if additional testing or
additional restrictions are required by the purchaser, and apply
only if specified individually in the purchase order.
1.2 Appendix X1 provides information on coil as a source
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel, of plates for pressure vessels.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
1.3 Appendix X2 provides information on the variability of
A01.11 on Steel Plates for Boilers and Pressure Vessels.
tensile properties in plates for pressure vessels.
Current e
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: A20/A20M − 19 A20/A20M − 20
Standard Specification for
1
General Requirements for Steel Plates for Pressure Vessels
This standard is issued under the fixed designation A20/A20M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
2
1.1 This general requirements specification covers a group of common requirements that, unless otherwise specified in the
applicable product specification, apply to rolled steel plates for pressure vessels covered by each of the following product
specifications issued by ASTM:
A
Title of Specification ASTM Designation
Pressure Vessel Plates, Alloy Steel, Nickel A203/A203M
Pressure Vessel Plates, Alloy Steel, Molybdenum A204/A204M
Pressure Vessel Plates, Alloy Steel, Manganese- A225/A225M
Vanadium-Nickel
Stainless Chromium Steel-Clad Plate A263
Stainless Chromium-Nickel Steel-Clad Plate A264
Nickel and Nickel-Base Alloy-Clad Steel Plate A265
Pressure Vessel Plates, Carbon Steel, Low- and A285/A285M
Intermediate-Tensile Strength
Pressure Vessel Plates, Carbon Steel, Manganese-Silicon A299/A299M
Pressure Vessel Plates, Alloy Steel, Manganese- A302/A302M
Molybdenum and Manganese-Molybdenum-Nickel
Pressure Vessel Plates, Alloy Steel, Double- A353/A353M
Normalized and Tempered 9 % Nickel
Pressure Vessel Plates, Alloy Steel, Chromium- A387/A387M
Molybdenum
Pressure Vessel Plates, Carbon Steel, High Strength A455/A455M
Manganese
Pressure Vessel Plates, Carbon Steel, for Intermediate- A515/A515M
and Higher-Temperature Service
Pressure Vessel Plates, Carbon Steel, Moderate- and A516/A516M
Lower-Temperature Service
Pressure Vessel Plates, Alloy Steel, High-Strength, A517/A517M
Quenched and Tempered
Pressure Vessel Plates, Alloy Steel, Quenched and A533/A533M
Tempered, Manganese-Molybdenum and Manganese-
Molybdenum-Nickel
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.11
on Steel Plates for Boilers and Pressure Vessels.
Current edition approved May 1, 2019Nov. 1, 2020. Published May 2019November 2020. Originally approved in 1950. Last previous edition approved in 20182019 as
A20/A20M – 18.A20/A20M – 19. DOI: 10.1520/A0020_A0020M-19.10.1520/A0020_A0020M-20.
2
For ASME Boiler and Pressure Vessel Code applications, see related Specification SA-20/SA-20M in Section II of that Code.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A20/A20M − 20
A
Title of Specification ASTM Designation
Pressure Vessel Plates, Heat-Treated, Carbon- A537/A537M
Manganese-Silicon Steel
Pressure Vessel Plates, Alloy Steel, Quenched-and- A542/A542M
Tempered, Chromium-Molybdenum, and Chromium-
Molybdenum-Vanadium
Pressure Vessel Plates, Alloy Steel, Quenched and A543/A543M
Tempered Nickel-Chromium-Molybdenum
Pressure Vessel Plates, Alloy Steel, Quenched and A553/A553M
Tempered 7, 8, and 9 % Nickel
Pressure Vessel Plates, Carbon Steel, Manganese- A562/A562M
Titanium for Glass or Diffused Metallic Coatings
Pressure Vessel Plates, Carbon Steel, High Strength, for A612/A612M
Moderate and Lower Temperature Service
1
Pressure Vessel Plates, 5 % and 5 ⁄2 % Nickel Alloy A645/A645M
Steels, Specially Heat Treated
Pressure Vessel Plates, Carbon-Manganese-Silicon A662/A662M
Steel, for Moderate and Lower Temperature Service
Pressure Vessel Plates, Carbon-Manganese-Silicon A724/A724M
Steel, Quenched and Tempered, for Welded Pressure
Vessels
Pressure Vessel Plates, Low-Carbon Age-Hardening A736/A736M
Nickel-Copper-Chromium-Molybdenum-Columbium
(Niobium) Alloy Steel
Pressure Vessel Plates, High-Strength Low-Alloy Steel A737/A737M
Pressure Vessel Plates, Heat-Treated, Carbon- A738/A738M
Manganese-Silicon Steel, for Moderate and Lower
Temperature Service
Pressure Vessel Plates, Alloy Steel, Chromium- A832/A832M
Molybdenum-Vanadium
Steel Plates for Pressure Vessels, Produced by A841/A841M
Thermo-Mechanical Control Process (TMCP)
Steel Plates, 9 % Nickel Alloy, for Pressure Vessels, A844/A844M
Produced by the Direct-Quenching Process
Pressure Vessel Plate
...

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1.3 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM A480/A480M-23a(Specification)
Standard Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip

ABSTRACT
This specification covers general requirements for flat-rolled stainless and heat-resisting steel plate, sheet, and strip. The steel shall be made by one of the following processes: electric-arc, electric-induction, or other suitable processes. Heat and product analyses shall conform to the chemical requirements for each of the specific elements. The material shall undergo mechanical tests such as tension test, hardness test, and bend test. Special tests like intergranular corrosion test, permeability test, Charpy impact testing and tests for detrimental intermetallic phases in wrought duplex stainless steels shall be also be performed when required.
SCOPE
1.1 This specification2 covers a group of general requirements that, unless otherwise specified in the purchase order or in an individual specification, shall apply to rolled steel plate, sheet, and strip, under each of the following specifications issued by ASTM: Specifications A240/A240M, A263, A264, A265, A666, A693, A793, and A895.  
1.2 In the case of conflict between a requirement of a product specification and a requirement of this specification, the product specification shall prevail. In the case of conflict between a requirement of the product specification or a requirement of this specification and a more stringent requirement of the purchase order, the purchase order shall prevail. The purchase order requirements shall not take precedence if they, in any way, violate the requirements of the product specification or this specification; for example, by waiving a test requirement or by making a test requirement less stringent.  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The SI units are shown in brackets, except that when A480M is specified, Annex A3 shall apply for the dimensional tolerances and not the bracketed SI values in Annex A2. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.4 This specification and the applicable material specifications are expressed in both inch-pound and SI units. However, unless the order specifies the applicable “M” specification designation [SI units], the material shall be furnished in inch-pound units.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM E2552-23(Guide)
Standard Guide for Assessing the Environmental and Human Health Impacts of New Compounds for Military Use

SIGNIFICANCE AND USE
5.1 The purpose of this guide is to provide a logical, tiered approach in the development of environmental health criteria coincident with level and effort in the research, development, testing, and evaluation of new materials for military use. Various levels of uncertainty are associated with data collected from previous stages. Following the recommendation in the guide should reduce the relative uncertainty of the data collected at each developmental stage. At each stage, a general weight of evidence qualifier shall accompany each exposure/effect relationship. They may be simple (for example, low, medium, or high confidence) or sophisticated using a numerical value for each predictor as a multiplier to ascertain relative confidence in each step of risk characterization. The specific method used will depend on the stage of development, quantity and availability of data, variation in the measurement, and general knowledge of the dataset. Since specific formulations, conditions, and use scenarios may not be known until the later stages, exposure estimates can be determined when practical (for example, Engineering and Manufacturing Development; see 6.6). Exposure data can then be used with other toxicological data collected from previous stages in a quantitative risk assessment to determine the relative degree of hazard.  
5.2 Data developed from the use of this guide are designed to be consistent with criteria required in weapons and weapons system development (for example, programmatic environment, safety and occupational health evaluations, environmental assessments/environmental impact statements, toxicity clearances, and technical data sheets).  
5.3 Information shall be evaluated in a flexible manner consistent with the needs of the authorizing program. This requires proper characterization of the current problem. For example, compounds may be ranked relative to the environmental criteria of the prospective alternatives, the replacement compound, and within bo...
SCOPE
1.1 This guide is intended to determine the relative environmental influence of new substances, consistent with the research and development (R&D) level of effort and is intended to be applied in a logical, tiered manner that parallels both the available funding and the stage of research, development, testing, and evaluation. Specifically, conservative assumptions, relationships, and models are recommended early in the research stage, and as the technology is matured, empirical data will be developed and used. Munition constituents are included and may include propellants, oxidizers, explosives, binders, stabilizers, metals, dyes, and other compounds used in the formulation to produce a desired effect. Munition systems range from projectiles, grenades, rockets/missiles, training simulators, to smokes and obscurants. Given the complexity of issues involved in the assessment of environmental fate and effects and the diversity of the systems used, this guide is broad in scope and not intended to address every factor that may be important in an environmental context. Rather, it is intended to reduce uncertainty at minimal cost by considering the most important factors related to human health and environmental impacts of energetic materials. This guide provides an outline for collecting data useful in a relative ranking procedure to provide the systems scientist with a sound basis for prospectively determining a selection of candidates based on environmental and human health criteria. The general principles in this guide are applicable to substances other than energetics if intended to be used in a similar manner with similar exposure profiles.  
1.2 The scope of this guide includes:  
1.2.1 Energetic and other new/novel materials and compositions in all stages of research, development, test and evaluation.  
1.2.2 Environmental assessment, including:
1.2.2.1 Human and ecological effects of the unexploded energetics and ...

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ASTM
ASTM D8042-18(2023)(Test Method)
Test Method for Shrinkage Temperature of Wet Blue and Wet White

SIGNIFICANCE AND USE
5.1 This test method is designed to determine the temperature at which the Wet Blue or Wet White specimen experiences shrinkage. In this test method, shrinkage occurs as a result of hydrothermal denaturation of the collagen protein molecules which make up the fiber structure of the Wet Blue or Wet White. The shrinkage temperature of Wet Blue or Wet White is influenced by many different factors, most of which appear to affect the number and nature of crosslinking interactions between adjacent polypeptide chains of the collagen protein molecules. The value of the shrinkage temperature of Wet Blue or Wet White is commonly used as an indicator of the type of tannage or the degree of tannage, or both, of that particular Wet Blue or Wet White (especially for the more hydrothermally stable tannages such as chrome tannage).
SCOPE
1.1 This test method covers the determination of the shrinkage temperature of all types of Wet Blue and Wet White. The heating medium is water when the shrinkage temperature is at or below 98 °C. The heating medium is a glycerine-water solution when the shrinkage temperature is above 98 °C.  
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D8530/D8530M-23(Guide)
Standard Guide for the Selection and Use of Waterstops

SIGNIFICANCE AND USE
4.1 This guide is intended to be used in the selection and installation of waterstops in cast-in-place concrete construction. This guide is intended to assist the building owner, owner’s representative, architect, engineer, contractor, and/or authorized inspector during the specification and installation of waterstops.  
4.2 This guide is applicable to cast-in-place concrete construction. The use of this guide may not be appropriate for installation of waterstops in other types of concrete construction, including but not limited to, pneumatically applied (that is, shotcrete) and precast concrete construction.
SCOPE
1.1 This guide covers the use of waterstops within cast-in-place concrete construction. Waterstops are generally placed within static, non-moving construction joints in concrete to close off the joint to water, which may be under significant hydrostatic pressure. They are used as part of the overall waterproofing strategy for a building or other structure. Expansion and other types of moving joints may require the use of waterstops, which can accommodate the anticipated movement of the structure and are beyond the scope of this guide.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents: therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM E2956-23(Guide)
Standard Guide for Monitoring the Neutron Exposure of LWR Reactor Pressure Vessels

SIGNIFICANCE AND USE
4.1 Regulatory Requirements—The USA Code of Federal Regulations (10CFR Part 50, Appendix H) requires the implementation of a reactor vessel materials surveillance program for all operating LWRs. Other countries have similar regulations. The purpose of the program is to (1) monitor changes in the fracture toughness properties of ferritic materials in the reactor vessel beltline6 resulting from exposure to neutron irradiation and the thermal environment, and (2) make use of the data obtained from surveillance programs to determine the conditions under which the vessel can be operated with adequate margins of safety throughout its service life. Practice E185, derived mechanical property data, and (r, θ, z) physics-dosimetry data (derived from the calculations and reactor cavity and surveillance capsule measurements (1) using physics-dosimetry standards) can be used together with information in Guide E900 and Refs. 4, 11-18 to provide a relation between property degradation and neutron exposure, commonly called a “trend curve.” To obtain this trend curve at all points in the pressure vessel wall requires that the selected trend curve be used together with the appropriate (r, θ, z) neutron field information derived by use of this guide to accomplish the necessary interpolations and extrapolations in space and time.  
4.2 Neutron Field Characterization—The tasks required to satisfy the second part of the objective of 4.1 are complex and are summarized in Practice E853. In doing this, it is necessary to describe the neutron field at selected (r, θ, z) points within the pressure vessel wall. The description can be either time dependent or time averaged over the reactor service period of interest. This description can best be obtained by combining neutron transport calculations with plant measurements such as reactor cavity (ex-vessel) and surveillance capsule or RPV cladding (in-vessel) measurements, benchmark irradiations of dosimeter sensor materials, and knowledge of th...
SCOPE
1.1 This guide establishes the means and frequency of monitoring the neutron exposure of the LWR reactor pressure vessel throughout its operating life.  
1.2 The physics-dosimetry relationships determined from this guide may be used to estimate reactor pressure vessel damage through the application of Practice E693 and Guide E900, using fast neutron fluence (E > 1.0 MeV and E > 0.1 MeV), displacements per atom (dpa), or damage-function-correlated exposure parameters as independent exposure variables. Supporting the application of these standards are the E853, E944, E1005, and E1018 standards, identified in 2.1.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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