A periodic safety review is considered an effective way to obtain an overview of nuclear power plant safety. It is also used to determine reasonable and practicable modifications to maintain a high level of safety during continued operation, and to justify operation of a nuclear power plant beyond the original time frame. The review considers life limiting processes and features of structures, systems and components important to safety, and whether there are any foreseeable circumstances that could endanger the safe operation of the nuclear power plant. This publication addresses the scope of assessment, methods and applicable criteria within the periodic safety review and long term operation programmes framework, to support decision making for long term operation of nuclear power plants.

• 1. INTRODUCTION
  • 1.1. Background
  • 1.2. Objective
  • 1.3. Scope
  • 1.4. Structure
• 2. STRATEGY AND METHODOLOGY FOR PERIODIC SAFETY REVIEW IN SUPPORT OF LONG TERM OPERATION JUSTIFICATION
  • 2.1. Scope and content of periodic safety review for justification of long term operation
    • 2.1.1. Time frame of PSR for LTO
    • 2.1.2. Scope setting of SSCs
    • 2.1.3. Scope of the most relevant safety factors for justification of LTO
    • 2.1.4. Scope of other safety factors considered for justification of LTO
  • 2.2. Periodic safety review basis document
    • 2.2.1. Development of the PSR basis document
    • 2.2.2. Content and structure of the PSR basis document
    • 2.2.3. Regulations, codes and standards considered in the PSR
  • 2.3. Methodology and acceptance criteria
    • 2.3.1. Introduction
    • 2.3.2. Review of safety factors
• 3. COORDINATION OF PERIODIC SAFETY REVIEW AND LONG TERM OPERATION ACTIVITIES
  • 3.1. Areas in which the long term operation programme could provide inputs to periodic safety review
    • 3.1.1. Actual condition of SSCs important to safety (safety factor 2)
    • 3.1.2. Equipment qualification (safety factor 3)
    • 3.1.3. Ageing (safety factor 4)
    • 3.1.4. Organization, the management system and safety culture (safety factor 10)
    • 3.1.5. Summary of key inputs from LTO to PSR
  • 3.2. Key outputs from periodic safety review for justification of long term operation
    • 3.2.1. Obsolescence assessment
    • 3.2.2. Cumulative effects of physical ageing and non-physical ageing
    • 3.2.3. Identification of safety improvements
    • 3.2.4. Environmental impact of LTO
• 4. GLOBAL ASSESSMENT
  • 4.1. Purpose of global assessment
  • 4.2. Deviations and their safety significance
  • 4.3. Analysis of interfaces, gaps and overlaps
  • 4.4. Analysis of the combined effects of findings
  • 4.5. Assessment of defence in depth
  • 4.6. Determination of reasonably practicable safety improvements
    • 4.6.1. Determination of mandatory safety issues
    • 4.6.2. Development of safety improvements
    • 4.6.3. Decision making process
    • 4.6.4. Safety assessment
    • 4.6.5. Determination of residual risk
  • 4.7. Development of an integrated implementation plan
  • 4.8. Assessment of the overall level of plant safety
• 5. IMPLEMENTATION OF PROGRAMMES, COMMITMENTS AND IMPROVEMENTS
  • 5.1. Introduction
  • 5.2. Processes for implementation of long term operation and periodic safety review
  • 5.3. Mapping of similar long term operation areas to the safety factors in the periodic safety review
  • 5.4. Implementation of the programmes for long term operation and periodic safety review
  • 5.5. Recommended tools for implementation of the programmes for periodic safety review and long term operation
    • 5.5.1. Integrated implementation plan
    • 5.5.2. Programme and project scheduling
    • 5.5.3. Programme and project collaboration platform
• 6. ROLES AND RESPONSIBILITIES IN PREPARATION FOR SAFE LONG TERM OPERATION WHEN INTEGRATED WITH PERIODIC SAFETY REVIEW
  • 6.1. General
  • 6.2. Roles and responsibilities of involved parties
    • 6.2.1. Roles and responsibilities of the regulatory body
    • 6.2.2. Roles and responsibilities of the operating organization
    • 6.2.3. Desired inputs and outputs of each interested party
  • 6.3. Communication between the operating organization and the regulatory body
  • 6.4. Coordination of submissions for long term operation
  • 6.5. Government and public information
  • 6.6. Regulatory expectations for PSR and long term operation
• 7. DOCUMENTATION IN SUPPORT OF JUSTIFICATION OF LONG TERM OPERATION
• REFERENCES
• Annex I MEMBER STATES’ EXPERIENCES AND PRACTICES
• Annex II EXAMPLE OF A GLOBAL ASSESSMENT
• ABBREVIATIONS
• CONTRIBUTORS TO DRAFTING AND REVIEW