• English
  • العربية
  • 中文
  • Français
  • Русский
  • Español

You are here

Ensuring Robust National Nuclear Safety Systems — Institutional Strength in Depth

A Report by the International Nuclear Safety Group

INSAG Series No. 27
English STI/PUB/1779 978-92-0-102317-9
24 4 24.00 2017

Download PDF (733 KB)


Defence in depth has become a fundamental aspect of the analysis of the adequacy of technical systems to assure nuclear power plant safety. It is a comprehensive approach to providing a systematic means to analyse and assure layers of systems to prevent or mitigate accidents. This publication is intended to provide a philosophy to guide the thinking about the institutional structures necessary to assure nuclear safety. It refers to the three important institutional subsystems – the industry, regulator and stakeholders – and describes the interfaces that should be nurtured among these as well as within each subsystem. The publication is intended to serve as a fundamental tool in the continuing efforts to strengthen nuclear safety.

More Information on reusing IAEA copyright material.


INSAG, Nuclear and Radiological Safety, Nuclear Power Plants, Accidents, Prevention, Nuclear Reactors, Safety Measures, System Safety, Defence in Depth, Industry, Regulator, Stakeholders, Subsystems, Nuclear Safety Systems, Strength in Depth, Framework, Layer, Design, Analyse, Safety Measures, International Nuclear Safety Group, Institutional Structures, Human Factors, Fukushima Daiichi

How to order

Ordering Locally

Please use the following links for an up-to-date list of IAEA distributors:

Distributors of IAEA Publications

How to Access IAEA e-books

Orders and requests for information may also be addressed to:

Marketing and Sales Unit
International Atomic Energy Agency
Vienna International Centre
PO Box 100, A-1400 Vienna,

Tel.: +43 1 2600 22529, +43 1 2600 22530
Fax: +43 1 2600 29302
Email: sales.publications@iaea.org

Download order form


  1. Employment
  2. Women
  3. Press

Stay in touch