There is a general agreement that auxiliary and supporting systems play an important role in the safe operation of a nuclear power plant. There is, however, no clear definition of such systems. The purpose of this publication is to propose a stepwise definition of auxiliary systems and supporting systems for nuclear power plants with water cooled reactors, to describe the general design concepts and design recommendations that are common to these systems, and to provide recommendations on specific design considerations for a selection of auxiliary and supporting systems.

• 1. INTRODUCTION
  • Background
  • Objective
  • Scope
  • Structure
• 2. GENERAL ASPECTS
  • Definitions and functions of auxiliary systems and supporting systems
  • Extent of the auxiliary systems and supporting systems
  • Safety functions
• 3. GENERAL CONSIDERATIONS IN DESIGN
  • Objectives of the design
  • Design basis
    • General
    • Safety functions
    • Postulated initiating events
    • Internal hazards
    • External hazards
    • Accident conditions
    • Reliability
    • Defence in depth
    • Safety classification
    • Environmental qualification
    • Codes and standards
    • Layout considerations
    • Interconnection considerations
    • Considerations for a multiple unit nuclear power plant
    • Use of probabilistic safety assessment in the design
• 4. SPECIFIC CONSIDERATIONS IN DESIGN
  • Communication systems
    • System or equipment function
    • Specific design basis
  • Heat transport systems
    • General considerations for heat transport systems
    • Chilled water system
    • Component cooling water system (other than for residual heat removal)
  • Process and post-accident sampling system
    • System or equipment function
    • Specific design basis
  • Process radiation monitoring system
    • System or equipment function
    • Specific design basis
  • Compressed air system
    • System or equipment function
    • Specific design basis
  • Heating, ventilation and air-conditioning systems
    • General considerations for heating, ventilation and air-conditioning systems
    • Specific considerations for heating, ventilation and air-conditioning systems maintaining ambient conditions
  • Lighting and emergency lighting systems
    • System or equipment function
    • Specific design basis
  • Overhead lifting equipment
    • System or equipment function
    • Specific design basis
  • Systems for treatment and control of radioactive waste and radioactive effluents
    • General considerations
    • System for treatment of gaseous effluents
    • System for treatment of liquid effluents
    • System for treatment of solid waste
  • Supporting systems for the emergency power supply and the alternate power source
    • Supporting systems for the emergency power supply
    • Supporting systems for the alternate power source
  • Other systems
    • Equipment and floor drainage system
    • Demineralized water reserve and associated system
• REFERENCES
• CONTRIBUTORS TO DRAFTING AND REVIEW