This Safety Guide provides recommendations on the design of nuclear installations for protection against the effects of external events (excluding earthquakes), meeting the applicable safety requirements established in relation to the design aspects of nuclear installations subjected to external events. It provides methods and procedures for defining an appropriate design for a nuclear installation, based on the site hazard evaluation and the layout of the installation. The aim is to provide design guidance, in particular for the protection of structures, systems and components important to safety against design basis external events. The guide also provides recommendations on the selection of beyond design basis external events, in order to check and verify safety margins.

• 1. INTRODUCTION
  • Background
  • Objective
  • Scope
  • Structure
• 2. GENERAL CONCEPTS AND APPLICATION OF SAFETY CRITERIA TO THE DESIGN OF NUCLEAR INSTALLATIONS AGAINST EXTERNAL EVENTS
  • Requirements for site evaluation
  • Design requirements for nuclear installations
    • External hazards
    • Engineering design rules
    • Design extension conditions
    • Heat transfer to an ultimate heat sink
    • Control room
  • Other aspects of design against external events
  • Structures, systems and components to be protected against external events
  • Design and evaluation for design basis external events and beyond design basis external events
  • Design safety features for design basis external events and beyond design basis external events
  • Administrative measures
• 3. DESIGN BASIS FOR EXTERNAL EVENTS
  • Derivation of the design basis from the site hazard evaluation
  • Overall design approach
  • Derivation of design basis external event loading conditions: General considerations
  • Derivation of design basis external event and beyond design basis external event loading conditions for specific external events
  • Evaluation of beyond design basis external events:Cliff edge effects
• 4. INSTALLATION LAYOUT AND DESIGN APPROACH
  • Installation layout
    • Physical separation
    • Protective structures
    • Dry site concept
    • Special consideration for layout in the design of a nuclear installation against external events
  • Approach to structural design
    • General
    • Loading derivation
    • Load combinations and acceptance criteria
    • Procedures for structural design
    • Material properties
    • Equipment qualification
    • Interaction effects
  • Approach to structural assessment for beyond design basis external events
    • General
    • Loading derivation
    • Load combinations and acceptance criteria
    • Procedures for structural assessment
    • Material properties
• 5. DESIGN PROVISIONS AGAINST EXTERNAL EVENTS
  • External floods, including tsunamis
    • Parameters characterizing the hazard
    • Design parameters for external floods
    • Means of protection against external floods
    • Coastal sites
    • River sites
    • Estuary sites
    • Assessment for beyond design basis external floods
  • Extreme winds
    • Interface with the hazard evaluation
    • Loading derivation
    • Design and qualification methods
    • Impact by wind-borne missiles
    • Atmospheric pressure changes
    • Dust storms and sandstorms
    • Miscellaneous effects from extreme winds
    • Means of protection against extreme winds
    • Assessment for beyond design basis extreme winds
  • Other extreme meteorological conditions
    • Loading derivation
    • Design methods and means of protection
    • Assessment for beyond design basis conditions
  • Volcanism
    • Design methods and means of protection
    • Design basis conditions and beyond design basis conditions
  • External fire
    • Loading derivation
    • Design methods
    • Means of protection
    • Assessment for beyond design basis external fire
  • External explosions
    • Interface with the hazard evaluation
    • Loading derivation
    • Design and qualification methods
    • Means of protection
    • Assessment for beyond design basis explosions
  • Toxic, flammable, corrosive and asphyxiant chemicals and their mixtures in air and liquids
    • Interface with the hazard evaluation
    • Atmospheric dispersion of hazardous chemicals
    • Design and qualification methods
    • Means of protection
    • Assessment for beyond design basis conditions
  • Radiological hazards from other on-site and collocated installations
    • Interface with the hazard evaluation
    • Design and qualification methods
    • Means of protection
    • Assessment for beyond design basis conditions
  • Aircraft crash
    • Loading derivation
    • Load–time function
    • Missile–target interaction
    • Vibration effects
    • Fire effects
    • Miscellaneous aspects
    • Means of protection
    • Assessment for beyond design basis aircraft crash
  • Electromagnetic interference
  • Biological phenomena
    • Design methods and means of protection
  • Hazards associated with floating bodies and hazardous liquids
    • Interface with the hazard evaluation
    • Loading derivation
    • Design and qualification methods
    • Means of protection
    • Assessment for beyond design basis conditions
  • Other external hazards
  • Combination of hazards
• 6. SAFETY DESIGN PROVISIONS FORNUCLEAR INSTALLATIONS OTHER THANNUCLEAR POWER PLANTS
• 7. APPLICATION OF THE MANAGEMENT SYSTEM TO THE DESIGN OF A NUCLEAR INSTALLATION AGAINST EXTERNAL EVENTS
• REFERENCES
• CONTRIBUTORS TO DRAFTING AND REVIEW