TAGs provide guidance to ONR inspectors on how to interpret and apply the Safety Assessment Principles (SAPs) and Security Assessment Principles (SyAPs). Some TAGs also support the enforcement of Licence Conditions, complementing the Technical Inspection Guides.
Because they cover a wide range of regulatory topics, TAGs are relevant to all ONR Inspectors, regardless of their specific role. They also help licensees and dutyholders understand ONR’s expectations for the technical content of safety cases and security plans.
Each TAG focuses on a specific technical area and is used at the Inspector’s discretion.
Most recently updated guidance
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NS-INSP-GD-011 - LC11 - On-site emergency arrangements
Issue 7.2; Review date: April 2026
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NS-INSP-GD-075 - Transport Inspection - Type A Packaging - Design Compliance
Issue 2; Review date: July 2030
Full list of guidance in this series
- NS-TAST-GD-002 - Radiation Shielding
- NS-TAST-GD-003 - Safety Systems
- NS-TAST-GD-004 - Fundamental Principles of safety assessment
- NS-TAST-GD-005 - Guidance on the Demonstration of ALARP (As Low As Reasonably Practicable)
- NS-TAST-GD-006 - Design Basis Analysis
- NS-TAST-GD-007 - Severe Accident Analysis
- NS-TAST-GD-009 - Examination, Inspection, Maintenance and Testing of Items Important to Safety
- NS-TAST-GD-010 - Early Initiation of Safety Systems
- NS-TAST-GD-013 - External hazards
- NS-TAST-GD-014 - Internal Hazards
- NS-TAST-GD-015 - Electromagnetic Interference
- NS-TAST-GD-016 - Integrity of Metal Structures, Systems and Components
- NS-TAST-GD-017 - Civil Engineering
- NS-TAST-GD-018 - Criticality Warning Systems
- NS-TAST-GD-019 - Essential Services
- NS-TAST-GD-020 - Civil Engineering Containments for Reactor Plants
- NS-TAST-GD-021 - Containment: Chemical Plants
- NS-TAST-GD-022 - Ventilation
- NS-TAST-GD-023 - Control of Processes Involving Nuclear Matter (SAP - ENM. 1 to 8)
- NS-TAST-GD-024 - Management of Radioactive Material and Radioactive Waste on Nuclear Licensed Sites
- NS-TAST-GD-026 - Decommissioning
- NS-TAST-GD-027 - Training and assuring personnel competence
- NS-TAST-GD-028 - Control and Instrumentation Aspects of Nuclear Plant Commissioning
- NS-TAST-GD-029 - Graphite reactor cores
- NS-TAST-GD-030 - Probabilistic Safety Analysis
- NS-TAST-GD-031 - Safety related Systems and Instrumentation
- NS-TAST-GD-033 - Duty Holder Management of Records
- NS-TAST-GD-035 - The Limits and Conditions for Nuclear Safety (Operating Rules)
- NS-TAST-GD-036 - Redundancy, Diversity, Segregation and Layout of Structures, Systems and Components
- NS-TAST-GD-038 - Radiological Protection
- NS-TAST-GD-041 - Criticality Safety
- NS-TAST-GD-042 - Validation of Computer Codes and Calculation Methods
- NS-TAST-GD-043 - Radiological Analysis - Normal Operation
- NS-TAST-GD-045 - Radiological analysis - Fault conditions
- NS-TAST-GD-046 - Computer Based Safety Systems
- NS-TAST-GD-048 - Organisational Change
- NS-TAST-GD-049 - Licensee Core Safety and Intelligent Customer Capabilities
- NS-TAST-GD-050 - Periodic Safety Reviews (PSRs) [NS-TAST-GD-050]
- NS-TAST-GD-051 - The purpose, scope and content of safety cases
- NS-TAST-GD-056 - Nuclear Lifting Operations
- NS-TAST-GD-057 - Design Safety Assurance
- NS-TAST-GD-058 - Human Factors Integration (HFI)
- NS-TAST-GD-059 - Human Machine Interface (HMI)
- NS-TAST-GD-060 - Procedure Design and Administrative Controls
- NS-TAST-GD-061 - Staffing Levels and Task Organisation
- NS-TAST-GD-062 - Workplaces and Work Environment
- NS-TAST-GD-063 - Human Reliability Analysis
- NS-TAST-GD-064 - Allocation of Function between Human and Engineered Systems
- NS-TAST-GD-065 - Function and Content of the Nuclear Baseline
- NS-TAST-GD-067 - Pressure Systems Safety
- NS-TAST-GD-072 - Function and Content of a Safety Management Prospectus
- NS-TAST-GD-075 - Safety of Nuclear Fuel in Power Reactors
- NS-TAST-GD-077 - Supply Chain Management Arrangements for the Procurement of Nuclear Safety Related Items or Services
- NS-TAST-GD-079 - Licensee Design Authority Capability
- NS-TAST-GD-080 - Nuclear Safety Advice and Independent Challenge
- NS-TAST-GD-081 - Safety Aspects Specific to Storage of Spent Nuclear Fuel
- NS-TAST-GD-083 - Land Quality Management
- NS-TAST-GD-087 - Control of Property Transactions on Licensed Sites
- NS-TAST-GD-088 - Chemistry of Operating Civil Nuclear Reactors
- NS-TAST-GD-089 - Chemistry Assessment
- NS-TAST-GD-094 - Categorisation of safety functions and classification of structures, systems and components (SSCs)
- NS-TAST-GD-096 - Guidance on Mechanics of Assessment
- NS-TAST-GD-097 - Criticality Safety Assessment of Transport Packages
- NS-TAST-GD-098 - Asset Management
- NS-TAST-GD-099 - Transport Engineering Assessment
- NS-TAST-GD-100 - Shielding and Dose Rate Safety Assessment of Transport Packages
- NS-TAST-GD-101 - Geological Disposal
- NS-TAST-GD-102 - General Guidance for Mechanical Engineering Specialism Group
- NS-TAST-GD-103 - Emergency Power Generation
- NS-TAST-GD-104 - Corporate Governance for Safety
- NS-TAST-GD-105 - The Assessment of the Nuclear Reactors (Environmental Impact Assessment for Decommissioning) Regulations Submissions
- NS-TAST-GD-107 - Safety Leadership
- NS-TAST-GD-109 - Ageing and Degradation Management