№ lp_1_21667
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Guidance for ONR inspectors on assessing criticality safety in nuclear facilities, detailing regulatory expectations, relevant licence conditions, and technical principles applied during safety case evaluations.
Professional Lead:
Professional Lead – Radiological Protection and Criticality
Author:
Inspector – Radiological Protection and Criticality
Approved by:
Professional Lead – Radiological Protection and Criticality
Issue No.:
8
Publication Date:
January 2024
Next Major Review Date:
January 2029
Doc. Ref.:
NS-TAST-GD-041
Record Ref. No.:
2023/58538
Revision Commentary:
Minor amendments from routine review, including update references and document format
Type of Document:
Technical Assessment Guide
Scope:
New and existing nuclear facilities, modifications, decommissioning activities
Related Legislation:
Nuclear site licence conditions LC 4, LC 14, LC 15, LC 19–28; Ionising Radiations Regulations 2017
Subject:
Criticality safety and assessment guidance for regulatory inspectors
References:
Safety Assessment Principles (SAPs), WENRA reference levels, IAEA Safety Standards and Guides
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The product description is provided for reference. Actual content and formatting may differ slightly.
Year:
2025
Region / City:
United Kingdom
Topic:
Radiological Protection, Criticality Safety
Document Type:
Technical Assessment Guide
Organization:
Office for Nuclear Regulation (ONR)
Author:
Principal Inspector - Radiological Protection & Criticality Specialism
Target Audience:
ONR inspectors
Period of Validity:
June 2025 - June 2030
Approval Date:
June 2025
Revision Date:
June 2025
Date of Next Review:
June 2030
Year:
2023
Region / city:
United Kingdom
Topic:
Nuclear Safety, Criticality Safety
Document Type:
Technical Guide
Organization / Institution:
Office for Nuclear Regulation (ONR)
Author:
Principal Inspector
Target Audience:
ONR inspectors, Nuclear safety professionals
Effective Period:
2023-2028
Approval Date:
Aug-23
Revision Date:
Aug-28
Document Reference No.:
NS-INSP-GD-053
Record Reference No.:
2020/209718
Year:
2025–2029
Institution:
PI Institution (unspecified)
Type:
Lab or University Proposal
Category:
NCSP Technical Program Element (Analytical Methods, Information Preservation & Dissemination, Integral Experiment, Nuclear Data, or Training and Education)
Mission and Vision Alignment:
NCSP Mission & Vision
PI Name:
Not specified
Collaborators:
Not specified
Budget:
Total budget for all years and collaborators (unspecified)
Milestones:
FY2025-FY2029 with yearly deliverables for each subtask
Period:
Fiscal Years 2025–2029
References:
Included if applicable
Context:
Template for planning and detailing research proposals within the NCSP framework, outlining objectives, budget, milestones, and deliverables across five fiscal years.
Year:
2023
Region / City:
United Kingdom
Topic:
Nuclear Safeguards
Document Type:
Technical Inspection Guide
Organization / Institution:
Office for Nuclear Regulation (ONR)
Author:
Safeguards Inspector
Target Audience:
Inspectors, Operators
Period of Validity:
Until June 2026
Approval Date:
January 2023
Review Date:
June 2026
Date of Updates:
January 2023, June 2026
Document Reference:
SG-INSP-GD-001
Record Reference No.:
ONRHH-822789359-20562
Year:
2024
Region / city:
Great Britain
Theme:
Nuclear Power, Safety and Security, Regulatory Process
Document Type:
Guideline
Organization:
Office for Nuclear Regulation (ONR)
Author:
M Connolly, T Parkes
Target Audience:
Requesting Parties (RP) including vendors and partner organizations
Period of Effect:
2007–2027
Approval Date:
August 2024
Next Major Review Date:
August 2027
Document Reference:
ONR-GDA-GD-006
Record Reference:
2024/34844
Revision Commentary:
Formatting updates and content review
Contextual Description:
A guideline document detailing the Generic Design Assessment (GDA) process for safety and security assessments of new Nuclear Power Plants (NPP) by the Office for Nuclear Regulation (ONR).
Year:
2025
Region / city:
Devonshire Dock Complex
Subject:
Nuclear Safety Inspection
Document Type:
Regulatory Report
Organization:
Office for Nuclear Regulation (ONR)
Author:
Nominated Site Inspector
Target Audience:
Public, Local Liaison Committee Members
Period of Effect:
January 1, 2025 – June 30, 2025
Approval Date:
August 2025
Date of Changes:
May 2025
Contextual Description:
Regulatory report on nuclear site inspections conducted at BAE Systems Marine Limited, detailing both routine and non-routine activities, including fire safety and incident investigations.
Year:
2025
Region / City:
Not specified
Topic:
Nuclear Safety, Property Transactions
Document Type:
Technical Inspection Guide
Organization / Institution:
Office for Nuclear Regulation (ONR)
Author:
Nuclear Safety Inspector
Target Audience:
Inspectors, Nuclear Facility Licensees
Period of Validity:
Not specified
Approval Date:
Not specified
Amendment Date:
Not specified
Year:
2025
Region / city:
Dungeness
Topic:
Nuclear site inspections
Document type:
Site report
Organization / institution:
Office for Nuclear Regulation (ONR)
Author:
Nominated Site Inspector Dungeness B
Target audience:
Stakeholders, public
Period of validity:
1 April – 30 June 2025
Approval date:
August 2025
Date of changes:
None
Year:
2024
Region / city:
United Kingdom
Topic:
Nuclear power plant siting, land use planning
Document type:
Guidance document
Organization / institution:
Office for Nuclear Regulation (ONR)
Author:
Inspector
Target audience:
ONR inspectors, technical audience
Period of validity:
November 2024 - March 2026
Approval date:
November 2024
Note:
Revision history
Issue 1.3:
Review date extended to June 2025
Issue 1.4:
Review date extended to March 2026
Date of last update:
November 2024
Year:
2025
Region / City:
United Kingdom
Theme:
Nuclear Security, Personnel Screening
Document Type:
Technical Assessment Guide
Author:
Principal Inspector
Target Audience:
ONR Inspectors, Dutyholders in the nuclear industry
Period of Validity:
Until August 2029
Approval Date:
August 2025
Date of Changes:
August 2025
Reference:
CNS-TAST-GD-8.2
Record Reference:
ONRHH-822789359-20080
Year:
2025
Region / city:
United Kingdom
Topic:
Nuclear Safety, Regulatory Compliance
Document Type:
Technical Guide
Institution:
Office for Nuclear Regulation (ONR)
Author:
Nuclear Safety Inspector
Target Audience:
Regulatory Inspectors, Nuclear Industry Operators
Approval Date:
July 2025
Review Date:
August 2030
Year:
2025
Region / city:
Great Britain
Subject:
Radiation Emergency Preparedness in Transport
Document Type:
Technical Inspection Guide
Authority:
ONR
Author:
Nuclear Safety Inspector, Radiological Protection
Target Audience:
ONR Inspectors
Period of Validity:
Until June 2030
Approval Date:
June 2025
Scheduled Review Date:
June 2030
Document Reference:
NS-INSP-GD-066
Record Reference:
ONRHH-822789359-20707
Revision Commentary:
Major update: Change in structure – Document now divided into four inspection "thematic areas". Clarified expectations around the method of testing of emergency plans and the frequency of testing. Removal of references to notifiable events as notification to ONR is dealt with in other ONR guidance.
Note:
Context
Year:
2025
Region / City:
United Kingdom
Topic:
Radiological Protection, Criticality Safety
Document Type:
Technical Assessment Guide
Organization:
Office for Nuclear Regulation (ONR)
Author:
Principal Inspector - Radiological Protection & Criticality Specialism
Target Audience:
ONR inspectors
Period of Validity:
June 2025 - June 2030
Approval Date:
June 2025
Revision Date:
June 2025
Date of Next Review:
June 2030
Year:
2025
Region / City:
UK
Subject:
Nuclear Safety, Human Machine Interface
Document Type:
Technical Guide
Organization / Institution:
ONR (Office for Nuclear Regulation)
Author:
Nuclear Inspector
Target Audience:
Inspectors
Approval Date:
May 2025
Next Scheduled Review:
May 2028
Document Reference:
NS-TAST-GD-059
Record Reference:
ONRHH-822789359-20450
Revision:
6
Date of Revision:
May 2025
Update Description:
Major update to add clarification and new references; inclusion of new sections and appendices.
Year:
2024
Region / City:
Sellafield
Subject:
Nuclear Safety Inspection Report
Document Type:
Regulatory Inspection Report
Organization / Institution:
Office for Nuclear Regulation (ONR)
Author:
Nominated Site Inspector
Target Audience:
Public, Regulatory Bodies, Stakeholders
Period of Validity:
1 October 2024 – 31 March 2025
Approval Date:
11 April 2025
Amendment Date:
Not specified
Contextual description:
Regulatory inspection report providing details on compliance checks, safety assessments, and improvements for Sellafield Ltd operations in nuclear safety, waste management, and fire safety.
Organisation:
Office for Nuclear Regulation
Document type:
Procedure
Document reference:
ONR-OL-PROC-003
Issue:
6
Published:
April 2025
Next scheduled review:
March 2030
Process owner:
Technical Director
Prepared by:
L Cairns, Incident Management Lead
Reviewed and approved by:
G York, Head of Organisational Learning
Scope:
Incident notifications in nuclear safety, radiological safety, security, safeguards, transport safety and RIDDOR
Geographical applicability:
Great Britain
Regulatory context:
Energy Act 2013; Health and Safety at Work etc. Act 1974; RIDDOR 2013
Related systems:
WIReD
External reporting body:
Department for Energy Security & Net Zero
Source type:
Regulatory procedure issued by a national regulator
Year:
2023
Region / city:
UK
Subject:
Nuclear Transport Security
Document Type:
Technical Assessment Guide
Organization:
Office for Nuclear Regulation (ONR)
Author:
Principal Inspector
Target Audience:
ONR Inspectors
Effective Period:
From publication until next review
Approval Date:
March 25, 2023
Next Scheduled Review:
March 28, 2023
Document Reference:
CNS-TAST-GD-6.7
Record Reference:
ONRHH-822789359-19855
Year:
2025
Region / city:
UK
Topic:
Nuclear material accountancy, Safeguards
Document type:
Technical assessment guide
Organ / institution:
Office for Nuclear Regulation (ONR)
Author:
Safeguards Subject Matter Expert
Target audience:
ONR inspectors
Period of validity:
Until next scheduled review in February 2030
Approval date:
February 2025
Revision date:
February 2025
Document reference:
SG-TAST-GD-002
Record reference:
2022/15641
Scope:
Regulatory guidance on nuclear material accounting for inspectors
Purpose:
To guide ONR inspectors in assessing nuclear material accounting reports
Relationship to other regulations:
NSR19, IAEA Safeguards
Related documents:
ONMACS
Description:
A technical assessment guide for ONR inspectors on nuclear material accounting and safeguards regulations in the UK, aligning with international standards.
Document ID:
MSP_TPL_0001
Document Name:
MSP Application Form
Issue:
7.0
Reason for Issue:
Issue Released for Baseline 49.0
Effective Date:
March 1, 2023
Document Change History:
1.0 – For publication – 02/18/2000; 2.0 – For Metering Service Provider Final Registration – 01/11/2002; 3.0 – Issue Released for Baseline 13.1 – June 1, 2005; 4.0 – Issue Released for Baseline 31.0 – March 5, 2014; 5.0 – Issue Released for Baseline 35.1 – June 1, 2016; 6.0 – Issue Released for Baseline 44.1 – December 2, 2020; 7.0 – Issue Released for Baseline 49.0 – March 1, 2023
Related Documents:
MDP_PRO_0007 – Market Manual 3: Part 3.1: Metering Service Provider (MSP) Registration, Revocation and De-registration; IMO_AGR_0012 – Metering Service Provider Agreement; MDP_RUL_0002 – Market Rules for the Ontario Electricity Market
Organization:
Independent Electricity System Operator (IESO)
Type:
Application Form
Scope:
Wholesale Electricity Market, Ontario
Confidentiality:
Confidential
Year:
2023
Region / city:
Migori
Topic:
Appeal proceedings, judicial review
Document type:
Court ruling
Institution:
Environment and Land Court, Migori
Author:
Not specified
Target audience:
Legal professionals, litigants
Period of validity:
2023
Approval date:
2025
Date of amendments:
None
Note:
Contextual description