Aimed primarily at regulatory bodies and the operating organizations of nuclear power plants, this Safety Guide provides recommendations on controlling activities relating to modifications to nuclear power plants. It covers modifications relating to plant configuration and to the operating organization, as well as temporary modifications. The responsibilities of the operating organization for the design, safety assessment and review, control, implementation and testing of these modifications are also within the scope of this Safety Guide as are the repair and replacement of equipment and components as part of the maintenance of the plant leading to new components.

• 1. INTRODUCTION
  • Background
  • Objective
  • Scope
  • Structure
• 2. MODIFICATION MANAGEMENT PROGRAMME
• 3. ROLES IN AND RESPONSIBILITIES FOR PLANT MODIFICATIONS
  • Operating organization
  • Use of contractors and other external organizations
• 4. MODIFICATIONS RELATING TO PLANT CONFIGURATION
  • Categorization of modifications by safety significance
  • Safety assessment
  • Review of proposed modifications
  • Design considerations
  • Modifications to operational limits and conditions
  • Modifications to procedures and documentation
  • Modifications to computer based systems
  • Configuration control
• 5. MODIFICATIONS TO THE OPERATING ORGANIZATION
  • Organizational changes
  • Modifications to programmes for the management of operations
  • Modifications to safety assessment tools and processes
• 6. TEMPORARY MODIFICATIONS
• 7. IMPLEMENTATION OF MODIFICATIONS RELATING TO PLANT CONFIGURATION
  • Administrative control of modifications to plant configuration
  • Specific safety considerations of modifications to plant configuration
  • Testing and commissioning of modifications to plant configuration
  • Putting modifications to plant configuration into operation
• 8. IMPLEMENTATION OF ORGANIZATIONAL CHANGES
• 9. TRAINING OF PERSONNEL
• 10. MANAGEMENT OF DOCUMENTATION
• Appendix I CRITERIA FOR THE CATEGORIZATION OF MODIFICATIONS BASED ON SAFETY SIGNIFICANCE
• Appendix II RECOMMENDED ELEMENTS OF A MODIFICATION PROCESS FOR SAFETY RELATED MODIFICATIONS
• REFERENCES
• CONTRIBUTORS TO DRAFTING AND REVIEW