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This document outlines a regulatory observation on the chemical behavior assumptions in severe accident analysis for the Rolls-Royce Small Modular Reactor (SMR) design, emphasizing the need for further justification and documentation of the chemical effects in accident progression.
Year:
2025
Region / City:
United Kingdom
Theme:
Nuclear Safety
Document Type:
Regulatory Observation
Organization:
Office for Nuclear Regulation (ONR)
Author:
Rolls-Royce SMR Ltd
Target Audience:
Nuclear Safety Engineers, Regulatory Authorities
Period of Validity:
Ongoing
Approval Date:
06/08/25
Amendment Date:
N/A
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Project Name:
Generic Design Assessment of the Rolls-Royce SMR
Report Title:
Step 2 Human Factors
Authored by:
[Redacted]
Report Issue No:
1
Document ID:
ONRW-2126615823-3678
Publication Date:
Jun-24
Note:
© Office for Nuclear Regulation, 2024
Executive Summary:
This report presents the outcomes of my Human Factors assessment of the Rolls-Royce Small Modular Reactor (SMR) as part of Step 2 of the Office for Nuclear Regulation (ONR) Generic Design Assessment (GDA).
Year:
2023
Region / City:
United Kingdom
Topic:
Nuclear Energy, Safety Assessment, Regulatory Framework
Document Type:
Project Assessment Report
Organization / Institution:
Office for Nuclear Regulation (ONR)
Author:
[REDACTED], Principal Inspector, ONR
Target Audience:
Regulatory bodies, nuclear industry professionals
Period of validity:
Not specified
Approval Date:
Not specified
Amendment Date:
Not specified
Year:
2025
Organization:
Rolls-Royce SMR Limited
Document type:
Resolution Plan
Related Regulatory Observation:
RO-RRSMR-005
Technical topics:
Internal Hazards, Civil Engineering, Life Fire Safety, Conventional Health and Safety, Mechanical Engineering, Electrical Engineering, Fault Studies
GDA step:
Step 3
Scope:
Internal Hazards Safety Case, design maturity, regulatory compliance
Intended audience:
Office of Nuclear Regulation (ONR)
Reference documents:
Interim Hazards Schedule and Requirements for Design Reference Point 2, Internal Hazards Design Maturity Justification Document, Generic E3S Case Scope and Deliverable Document – Internal Hazards
Rolls-Royce SMR RO Resolution Plan - Decommissioning E3S Case for the generic Rolls-Royce SMR design
Year:
2025
Note:
Region / city
Topic:
Nuclear Liabilities Regulation, Decommissioning Strategy
Document type:
Regulatory Observation
Organization:
Rolls-Royce SMR Ltd
Target audience:
Regulatory bodies, engineering teams, nuclear industry stakeholders
Context:
Detailed analysis of the decommissioning strategy for Rolls-Royce SMR nuclear design, addressing regulatory expectations and safety concerns.
Year:
2024
Region / City:
United Kingdom
Topic:
Structural integrity, nuclear safety assessment
Document Type:
Assessment Report
Author:
[Redacted]
Target Audience:
Nuclear regulators, safety engineers, structural integrity professionals
Period of Validity:
Ongoing
Approval Date:
Jun-24
Date of Modifications:
Not specified
Year:
2024
Region / City:
UK
Theme:
Security Assessment, Nuclear Energy, Small Modular Reactors
Document Type:
Assessment Report
Organization / Institution:
Office for Nuclear Regulation (ONR)
Author:
[Redacted]
Target Audience:
Regulatory bodies, Nuclear energy stakeholders
Period of Validity:
Ongoing assessment, Step 2
Approval Date:
Jun-24
Date of Modifications:
N/A
Year:
2024
Region / City:
United Kingdom
Topic:
Nuclear Safety, Small Modular Reactors
Document Type:
Assessment Report
Organization:
Office for Nuclear Regulation (ONR)
Author:
[Redacted]
Target Audience:
Regulatory bodies, Nuclear Industry Stakeholders
Period of Validity:
Ongoing, Step 2 of the Generic Design Assessment (GDA)
Approval Date:
Jul-24
Date of Changes:
Not specified
Year:
2024
Region / City:
United Kingdom
Topic:
Safety and Quality Assurance in Nuclear Reactor Design
Document Type:
Assessment Report
Organization / Institution:
Office for Nuclear Regulation
Author:
[Redacted]
Target Audience:
Regulatory bodies, nuclear safety professionals
Assessment Period:
Step 2 of GDA process
Approval Date:
June 2024
Amendment Date:
N/A
Year:
2024
Region / city:
United Kingdom
Topic:
Mechanical Engineering Assessment
Document type:
Assessment Report
Organization / institution:
Office for Nuclear Regulation
Author:
[Redacted]
Target audience:
Nuclear industry professionals, regulatory authorities
Validity period:
Step 2 of Generic Design Assessment
Approval date:
Jun-24
Revision date:
None
Assessment type:
Step 2
Safety case:
Mechanical engineering adequacy
Shortfalls identified:
Personnel access, mechanical handling, maintenance strategies
Conclusion:
No fundamental safety shortfalls identified at Step 2
Year:
2024
Region / City:
Great Britain
Subject:
Nuclear Safety
Document Type:
Assessment Report
Organization:
Office for Nuclear Regulation (ONR)
Author:
[Redacted]
Target Audience:
Regulatory Authorities, Nuclear Industry Stakeholders
Period of Validity:
2024-2026
Approval Date:
July-24
Date of Changes:
None
Context:
This document is an official assessment report on the Generic Design Assessment (GDA) of the Rolls-Royce Small Modular Reactor (SMR), summarizing the outcomes of Step 2, including the adequacy of the design, safety, security, and safeguard cases for regulatory review.
Year:
2023
Organisation:
Rolls-Royce SMR Ltd
Document type:
Regulatory Observation Resolution Plan
RO unique number:
RO-RRSMR-001
RO title:
Development of the generic E3S case
Lead technical topic:
Project
Related technical topics:
Chemistry; Civil Engineering; Control & Instrumentation; Conventional Fire Safety; Conventional Health and Safety; Electrical Engineering; Environment External Hazards; Fault Studies; Fuel and Core; Human Factors; Internal Hazards; Management for Safety and Quality Assurance; Mechanical Engineering; Nuclear Liabilities Regulation; Probabilistic Safety Analysis; Radiological Consequences; Radiological Protection; Safeguards; Security; Severe Accident Analysis; Structural Integrity
Regulatory action reference:
RO-RRSMR-001.A1
Regulatory context:
Generic Design Assessment (GDA) Step 2 and Step 3
Scope:
Development, management and assurance of the generic E3S Case
Confidentiality:
Proprietary and confidential information for authorised recipients only
Year:
2026
Note:
Region / City
Theme:
Equipment Qualification, Nuclear Safety
Document Type:
Technical Report
Organization / Institution:
Rolls-Royce SMR Ltd
Target Audience:
Technical stakeholders in nuclear facility design and safety
Year:
2025
Date sent:
02/09/2025
Acknowledgement required by:
23/09/2025
Resolution Plan Agreement Required by:
21/10/2025
RO unique number:
RO-RRSMR-014
Revision:
0
Record reference:
ONRW-216615823-8554
Observation title:
Cyber Security assessment submissions
Lead technical topic:
Cyber Security
Related technical topics:
Control & Instrumentation; Security
Organisation:
Office for Nuclear Regulation (ONR)
Requesting Party:
Rolls-Royce SMR Limited
Programme:
Generic Design Assessment (GDA)
Assessment stage:
Step 3
Industry sector:
Nuclear power generation
Regulatory framework:
UK nuclear safety and security regulation
Related guidance:
ONR Security Assessment Principles; ONR Technical Assessment Guides; IAEA Nuclear Security Series
Subject:
Adequacy of cyber security risk assessment methodology, system risk assessments, and supporting evidence within the GDA security case
Geographical scope:
Great Britain
Year:
2026
Region / City:
N/A
Topic:
Radiation Protection
Document Type:
Regulatory Observation
Organization:
Rolls-Royce SMR Ltd
Author:
N/A
Target Audience:
ONR (Office for Nuclear Regulation)
Period of Effect:
N/A
Approval Date:
N/A
Amendment Date:
N/A
Project Name:
Generic Design Assessment of the Rolls-Royce SMR
Report Title:
Step 2 Human Factors
Authored by:
[Redacted]
Report Issue No:
1
Document ID:
ONRW-2126615823-3678
Publication Date:
Jun-24
Note:
© Office for Nuclear Regulation, 2024
Executive Summary:
This report presents the outcomes of my Human Factors assessment of the Rolls-Royce Small Modular Reactor (SMR) as part of Step 2 of the Office for Nuclear Regulation (ONR) Generic Design Assessment (GDA).
Year:
2023
Region / City:
United Kingdom
Topic:
Nuclear Energy, Safety Assessment, Regulatory Framework
Document Type:
Project Assessment Report
Organization / Institution:
Office for Nuclear Regulation (ONR)
Author:
[REDACTED], Principal Inspector, ONR
Target Audience:
Regulatory bodies, nuclear industry professionals
Period of validity:
Not specified
Approval Date:
Not specified
Amendment Date:
Not specified
Year:
2025
Region / City:
Goodwood, West Sussex
Topic:
Construction, Automotive Industry
Document Type:
Press Release
Organization / Institution:
Rolls-Royce Motor Cars
Author:
Rolls-Royce Media Team
Target Audience:
General Public, Automotive Industry Professionals
Period of Validity:
Not specified
Approval Date:
Not specified
Modification Date:
Not specified
Year:
2025
Organization:
Rolls-Royce SMR Limited
Document type:
Resolution Plan
Related Regulatory Observation:
RO-RRSMR-005
Technical topics:
Internal Hazards, Civil Engineering, Life Fire Safety, Conventional Health and Safety, Mechanical Engineering, Electrical Engineering, Fault Studies
GDA step:
Step 3
Scope:
Internal Hazards Safety Case, design maturity, regulatory compliance
Intended audience:
Office of Nuclear Regulation (ONR)
Reference documents:
Interim Hazards Schedule and Requirements for Design Reference Point 2, Internal Hazards Design Maturity Justification Document, Generic E3S Case Scope and Deliverable Document – Internal Hazards
Rolls-Royce SMR RO Resolution Plan - Decommissioning E3S Case for the generic Rolls-Royce SMR design
Year:
2025
Note:
Region / city
Topic:
Nuclear Liabilities Regulation, Decommissioning Strategy
Document type:
Regulatory Observation
Organization:
Rolls-Royce SMR Ltd
Target audience:
Regulatory bodies, engineering teams, nuclear industry stakeholders
Context:
Detailed analysis of the decommissioning strategy for Rolls-Royce SMR nuclear design, addressing regulatory expectations and safety concerns.