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Criticality Safety in the Handling of Fissile Material

Specific Safety Guide

IAEA Safety Standards Series No. SSG-27 (Rev. 1)
Specific Safety Guides

English STI/PUB/1995 ¦ 978-92-0-118722-2

86 pages ¦ € 46.00 ¦ Date published: 2022

Download PDF (1.42 MB)

EPUB format available (2.23 MB)


The objectives of nuclear criticality safety are to prevent a self-sustained nuclear chain reaction. This Safety Guide provides guidance and recommendations on how to meet the relevant requirements for ensuring subcriticality when dealing with fissile material and for planning the response to criticality accidents. The recommendations address how to ensure subcriticality in systems involving fissile materials during normal operation and during credible abnormal conditions, from initial design through commissioning, operation and decommissioning. This publication also provides recommendations on identification of credible abnormal conditions; performance of criticality safety assessments; verification, benchmarking and validation of calculation methods; safety measures to ensure subcriticality; and management of criticality safety. The guidance and recommendations are applicable to both regulatory bodies and operating organizations.

More Information on reusing IAEA copyright material.


IAEA Safety Standards, Criticality, Nuclear Engineering, Safety Measures, Radioactive Substances, Nuclear Facilities, Nuclear Criticality Safety, Fissile Material, Criticality Accidents, Subcriticality, Normal Operation, Credible Abnormal Conditions, Initial Design, Commissioning, Operation, Decommissioning, Recommendations, Criticality Safety Assessments, Verification, Benchmarking, Validation, Calculation Methods, Enrichment, Fuel Fabrication, Disposal, Radioactive Waste Management, Research, Development Laboratories, Criticality Detection, Alarm Systems, Training, Education, Operating Experience, Emergency Preparedness and Response

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