Chief Of Nuclear Safety

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Nuclear Facilities at Major DOE Sites Managed by the Office of Environmental Management

The Chief of Nuclear Safety (CNS) is responsible for ensuring that DOE Nuclear Safety Regulations, Standards, Guides, and national/international technical standards are applied in a correct manner in the conduct of DOE’s nuclear mission under the purview of the Under Secretary for Management and Performance.

Read the entire Message from the Chief of Nuclear Safety

CNS Resources

CTA/CNS Functions
The Secretary established the mission of the Chief Technical Authority (CTA) and supporting Chief of Nuclear Safety (CNS) in 2005 to provide independe
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CNS Safety in Project Management and Standard Review Plans
The experience with major nuclear design and construction projects continues to highlight the importance of a focused, technically rigorous, and stand
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Nuclear Facility Risk Ranking
The CNS has purview of over ninety EM nuclear facilities across the DOE complex. To ensure that limited resources are applied in a risk-informed and
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Seismic & Natural Phenomena Hazards
As part of the CNS role supporting safe operation for DOE nuclear facilities, CNS sponsors efforts to improve nuclear facilities’ ability to withstand
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National/International Standards
CNS and staff are recognized experts within their areas of technical responsibilities. An important aspect of this recognition is the contribution ma
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Chief of Nuclear Safety (CNS) Staff Assignments & Expertise
CNS staff maintains adequate technical proficiency, including the timely completion of Senior Technical Safety Manager (STSM) qualification.
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System for Analysis of Soil-Structure Interaction (SASSI) Verification & Validation (V&V) Problem Set
System for Analysis of Soil-Structure Interaction (SASSI) Verification & Validation (V&V) Problem Set
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Nuclear Safety Requirements DOE O 410.1
Central Technical Authority Responsibilities Regarding Nuclear Safety Requirements - DOE O 410.1. Requirements are defined as Codes of Federal Regu...
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Seismic Lessons-Learned Panel Meetings
The Chief of Nuclear Security (CNS) maintains a panel of experts known as the Seismic Lessons-Learned Panel, which meets periodically to discuss seism
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Defense Nuclear Facilities Safety Board (DNFSB) Letters and Recommendations
Defense Nuclear Facilities Safety Board (DNFSB) Letters and Recommendations
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Tritium Focus Group
The Tritium Focus Group (TFG), is a long standing DOE Working Group, whose purpose is to promote cost-effective improvements in tritium safety.
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Upcoming Event:

Natural Phenomena Hazards (NPH) Meeting – October 23-24, 2018, Rockville, MD. 
Questions about the NPH meeting can be directed to Dr. Steve McDuffie of the CNS staff at 509-373-6766, or stephen.mcduffie@rl.doe.gov.

CNS Staff

CNS Staff

Gregory Sosson
Associate Deputy Assistant for Field Operations Oversight and Chief of Nuclear Safety for the Department of Energy Office of Environmental Management
Stephen M. McDuffie
Natural Phenomena Hazards
William Weaver
Operational Readiness Authorization Basis
Amanda Anderson
Health Physics and Radiation Protection

CONTACT US

For more information about the Chief of Nuclear Safety, contact us by email at: cns@hq.doe.gov