ASTM E1827-22 PDF

Full title and description

Standard Practice for Evaluation of Uranium and Uranium Alloys for Nuclear Criticality Safety (ASTM E1827-22). This practice provides recommended procedures and guidance for evaluating the criticality safety characteristics of uranium and its alloys, including isotopic composition, physical form, moderation, reflection, and configuration control. It is intended to support safe handling, processing, transportation, and storage of uranium-bearing materials by providing methods to identify and control conditions that could lead to a criticality accident.

Abstract

ASTM E1827-22 establishes recommended practices to evaluate factors that influence nuclear criticality of uranium and uranium alloy systems. The standard addresses assessment of isotopic enrichment, geometry and mass limits, moderation and reflection effects, chemical and physical forms, and administrative/engineering controls. It guides analysts and safety professionals in applying conservative assumptions, bounding analyses, and test data to determine safe limits and required controls for operations involving uranium-bearing materials.

General information

• Status: Current (as of 2022 revision)
• Publication date: 2022
• Publisher: ASTM International
• ICS / categories: 27.120 (Nuclear engineering and nuclear fuels); nuclear criticality safety, uranium metallurgy
• Edition / version: E1827-22 (2022 edition)
• Number of pages: Approximately 10–20 pages (typical for ASTM practice documents; exact page count may vary by format)

Scope

This practice covers evaluation methods for uranium and uranium alloy systems to determine criticality safety margins. It applies to metallic uranium, uranium oxides, uranium compounds, and uranium alloys in a range of forms (powders, solids, solutions, and dispersions). The scope includes guidance on identifying controlling parameters such as isotopic composition (notably U-235 enrichment), mass and geometry limits, moderation by hydrogenous materials, reflection by surrounding materials, heterogeneity, and chemical effects that alter neutron moderation or absorption. It is not a design specification but a guidance document to inform safety analyses and administrative controls.

Key topics and requirements

• Identification of material form and isotopic composition, with emphasis on enrichment determination and its impact on criticality.
• Evaluation of geometry and mass limits; use of conservative bounding configurations to establish safe mass/volume limits.
• Assessment of moderation (water and other hydrogenous moderators) and reflection effects from nearby materials and structures.
• Consideration of chemical and physical states (powder, compact, solution) and their influence on neutron moderation and density.
• Guidance on heterogeneity and segregation effects in mixtures and assemblies.
• Recommendations for administrative and engineered controls, including monitoring, spacing, container design, and procedural limits.
• Use of computational methods and experimental data; emphasis on conservative assumptions and validation of calculational models.

Typical use and users

ASTM E1827-22 is used by nuclear criticality safety engineers, health physicists, operations managers, regulatory compliance staff, and design engineers in nuclear fuel fabrication, enrichment facilities, research reactors, decommissioning projects, and radiological laboratories. It supports development of safety analyses, safe handling procedures, storage and transportation criteria, training programs, and regulatory submissions related to uranium-containing materials.

Related standards

Related standards and guidance often used alongside ASTM E1827-22 include other ASTM nuclear material practices, ANSI/ANS criticality safety standards, IAEA safety guides on criticality prevention, and national regulations for transport and storage of radioactive materials. Documents addressing analytical methods, neutron cross-section libraries, and experimental criticality benchmark data are commonly referenced for detailed calculations and validation.

Keywords

uranium, uranium alloys, criticality safety, nuclear criticality, enrichment, U-235, moderation, reflection, mass limits, geometry, safety analysis, containment, neutron absorption

FAQ

Q: What is this standard?

A: ASTM E1827-22 is a practice that provides guidance for evaluating the criticality safety of uranium and uranium alloys, addressing factors such as enrichment, form, moderation, geometry, and controls to prevent inadvertent nuclear criticality.

Q: What does it cover?

A: It covers recommended evaluation methods for metallic and compound forms of uranium and uranium alloys, guidance on bounding assumptions, assessment of moderation and reflection effects, considerations for heterogeneity, and recommendations for administrative and engineered controls. It is intended to inform safety analyses rather than serve as a prescriptive design code.

Q: Who typically uses it?

A: Nuclear criticality safety engineers, radiological safety staff, facility operators, designers, and regulators involved with handling, processing, storing, or transporting uranium-bearing materials commonly use this practice.

Q: Is it current or superseded?

A: The designation E1827-22 indicates the 2022 revision. Users should verify with ASTM for the latest status and any subsequent revisions or corrigenda to ensure they are using the most current version.

Q: Is it part of a series?

A: It is part of ASTM's body of standards and practices related to nuclear materials and criticality safety. It is often used alongside other ASTM standards and national/international criticality safety guides and benchmark documents.

Q: What are the key keywords?

A: Key keywords include uranium, uranium alloys, criticality safety, enrichment, U-235, moderation, reflection, mass limits, geometry, and safety analysis.