Safety assessment and verification for nuclear power plants

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  • IAEASAFETY

    STANDARDSSERIES

    Safety Assessment andVerification for Nuclear Power Plants

    SAFETY GUIDENo. NS-G-1.2

    INTERNATIONAL ATOMIC ENERGY AGENCYVIENNA

    This publication has been superseded by GSR Part 4 and SSG-2

  • SAFETY ASSESSMENT AND VERIFICATION FOR

    NUCLEAR POWER PLANTS

    This publication has been superseded by GSR Part 4 and SSG-2

  • The Agencys Statute was approved on 23 October 1956 by the Conference on the Statute of theIAEA held at United Nations Headquarters, New York; it entered into force on 29 July 1957. TheHeadquarters of the Agency are situated in Vienna. Its principal objective is to accelerate and enlarge thecontribution of atomic energy to peace, health and prosperity throughout the world.

    IAEA, 2001

    Permission to reproduce or translate the information contained in this publication may beobtained by writing to the International Atomic Energy Agency, Wagramer Strasse 5, P.O. Box 100,A-1400 Vienna, Austria.

    Printed by the IAEA in AustriaNovember 2001STI/PUB/1112

    The following States are Members of the International Atomic Energy Agency:

    AFGHANISTANALBANIAALGERIAANGOLAARGENTINAARMENIAAUSTRALIAAUSTRIAAZERBAIJAN, REPUBLIC OFBANGLADESHBELARUSBELGIUMBENINBOLIVIABOSNIA AND HERZEGOVINABRAZILBULGARIABURKINA FASOCAMBODIACAMEROONCANADACENTRAL AFRICAN

    REPUBLICCHILECHINACOLOMBIACOSTA RICACOTE DIVOIRECROATIACUBACYPRUSCZECH REPUBLICDEMOCRATIC REPUBLIC

    OF THE CONGODENMARKDOMINICAN REPUBLICECUADOREGYPTEL SALVADORESTONIAETHIOPIAFINLANDFRANCEGABONGEORGIAGERMANY

    GHANAGREECEGUATEMALAHAITIHOLY SEEHUNGARYICELANDINDIAINDONESIAIRAN, ISLAMIC REPUBLIC OF IRAQIRELANDISRAELITALYJAMAICAJAPANJORDANKAZAKHSTANKENYAKOREA, REPUBLIC OFKUWAITLATVIALEBANONLIBERIALIBYAN ARAB JAMAHIRIYALIECHTENSTEINLITHUANIALUXEMBOURGMADAGASCARMALAYSIAMALIMALTAMARSHALL ISLANDSMAURITIUSMEXICOMONACOMONGOLIAMOROCCOMYANMARNAMIBIANETHERLANDSNEW ZEALANDNICARAGUANIGERNIGERIANORWAY

    PAKISTANPANAMAPARAGUAYPERUPHILIPPINESPOLANDPORTUGALQATARREPUBLIC OF MOLDOVAROMANIARUSSIAN FEDERATIONSAUDI ARABIASENEGALSIERRA LEONESINGAPORESLOVAKIASLOVENIASOUTH AFRICASPAINSRI LANKASUDANSWEDENSWITZERLANDSYRIAN ARAB REPUBLICTHAILANDTHE FORMER YUGOSLAV

    REPUBLIC OF MACEDONIATUNISIATURKEYUGANDAUKRAINEUNITED ARAB EMIRATESUNITED KINGDOM OF

    GREAT BRITAIN AND NORTHERN IRELAND

    UNITED REPUBLICOF TANZANIA

    UNITED STATES OF AMERICAURUGUAYUZBEKISTANVENEZUELAVIET NAMYEMENYUGOSLAVIAZAMBIAZIMBABWE

    This publication has been superseded by GSR Part 4 and SSG-2

  • SAFETY ASSESSMENT AND VERIFICATION FOR

    NUCLEAR POWER PLANTS

    SAFETY GUIDE

    SAFETY STANDARDS SERIES No. NS-G-1.2

    INTERNATIONAL ATOMIC ENERGY AGENCYVIENNA, 2001

    This publication has been superseded by GSR Part 4 and SSG-2

  • VIC Library Cataloguing in Publication Data

    Safety assessment and verification for nuclear power plants : safety guide. Vienna : International Atomic Energy Agency, 2001.

    p. ; 24 cm. (Safety standards series, ISSN 1020525X ; no. NS-G-1.2)STI/PUB/1112ISBN 9201016018Includes bibliographical references.

    1. Nuclear power plants Risk assessment. 2. Nuclear power plants Safety measures. I. International Atomic Energy Agency. II. Series.

    VICL 0100267

    This publication has been superseded by GSR Part 4 and SSG-2

  • FOREWORD

    by Mohamed ElBaradeiDirector General

    One of the statutory functions of the IAEA is to establish or adopt standards ofsafety for the protection of health, life and property in the development and applicationof nuclear energy for peaceful purposes, and to provide for the application of thesestandards to its own operations as well as to assisted operations and, at the request ofthe parties, to operations under any bilateral or multilateral arrangement, or, at therequest of a State, to any of that States activities in the field of nuclear energy.

    The following bodies oversee the development of safety standards: theCommission for Safety Standards (CSS); the Nuclear Safety Standards Committee(NUSSC); the Radiation Safety Standards Committee (RASSC); the Transport SafetyStandards Committee (TRANSSC); and the Waste Safety Standards Committee(WASSC). Member States are widely represented on these committees.

    In order to ensure the broadest international consensus, safety standards arealso submitted to all Member States for comment before approval by the IAEA Boardof Governors (for Safety Fundamentals and Safety Requirements) or, on behalf of theDirector General, by the Publications Committee (for Safety Guides).

    The IAEAs safety standards are not legally binding on Member States but maybe adopted by them, at their own discretion, for use in national regulations in respectof their own activities. The standards are binding on the IAEA in relation to its ownoperations and on States in relation to operations assisted by the IAEA. Any Statewishing to enter into an agreement with the IAEA for its assistance in connectionwith the siting, design, construction, commissioning, operation or decommissioningof a nuclear facility or any other activities will be required to follow those parts of thesafety standards that pertain to the activities to be covered by the agreement.However, it should be recalled that the final decisions and legal responsibilities in anylicensing procedures rest with the States.

    Although the safety standards establish an essential basis for safety, theincorporation of more detailed requirements, in accordance with national practice,may also be necessary. Moreover, there will generally be special aspects that need tobe assessed on a case by case basis.

    The physical protection of fissile and radioactive materials and of nuclearpower plants as a whole is mentioned where appropriate but is not treated in detail;obligations of States in this respect should be addressed on the basis of the relevantinstruments and publications developed under the auspices of the IAEA. Non-radiological aspects of industrial safety and environmental protection are also notexplicitly considered; it is recognized that States should fulfil their internationalundertakings and obligations in relation to these.

    This publication has been superseded by GSR Part 4 and SSG-2

  • The requirements and recommendations set forth in the IAEA safety standardsmight not be fully satisfied by some facilities built to earlier standards. Decisions onthe way in which the safety standards are applied to such facilities will be taken byindividual States.

    The attention of States is drawn to the fact that the safety standards of theIAEA, while not legally binding, are developed with the aim of ensuring that thepeaceful uses of nuclear energy and of radioactive materials are undertaken in amanner that enables States to meet their obligations under generally acceptedprinciples of international law and rules such as those relating to environmentalprotection. According to one such general principle, the territory of a State must notbe used in such a way as to cause damage in another State. States thus have anobligation of diligence and standard of care.

    Civil nuclear activities conducted within the jurisdiction of States are, as anyother activities, subject to obligations to which States may subscribe underinternational conventions, in addition to generally accepted principles of internationallaw. States are expected to adopt within their national legal systems such legislation(including regulations) and other standards and measures as may be necessary to fulfilall of their international obligations effectively.

    EDITORIAL NOTE

    An appendix, when included, is considered to form an integral part of the standard andto have the same status as the main text. Annexes, footnotes and bibliographies, if included, areused to provide additional information or practical examples that might be helpful to the user.

    The safety standards use the form shall in making statements about requirements,responsibilities and obligations. Use of the form should denotes recommendations of adesired option.

    The English version of the text is the authoritative version.

    This publication has been superseded by GSR Part 4 and SSG-2

  • CONTENTS

    1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

    1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Objective (1.31.5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Scope (1.61.8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Structure (1.9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

    2. SAFETY ASSESSMENT, SAFETY ANALYSIS AND INDEPENDENT VERIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

    Safety assessment and safety analysis (2.12.7) . . . . . . . . . . . . . . . . . . . 3Independent verification (2.82.12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Relationship between the design, safety assessment and independent verification (2.132.19) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

    3. ENGINEERING ASPECTS IMPORTANT TO SAFETY . . . . . . . . . . . 7

    General (3.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Proven engineering practices and operational experience (3.23.6) . . . . . 7Innovative design features (3.73.9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Implementation of defence in depth (3.103.16) . . . . . . . . . . . . . . . . . . . 8Radiation protection (3.173.25) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Safety classification of structures, systems and components (3.263.31) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Protection against external events (3.323.49) . . . . . . . . . . . . . . . . . . . . 13Protection against internal hazards (3.503.56) . . . . . . . . . . . . . . . . . . . . 16Conformity with applicable codes, standards and guides (3.573.58) . . . 18Load and load combination (3.593.62) . . . . . . . . . . . . . . . . . . . . . . . . . 18Selection of materials (3.633.72) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Single failure assessment and redundancy/independence (3.733.80) . . . 20Diversity (3.813.85) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23In-service testing, maintenance, repair, inspections and monitoring of items important to safety (3.863.90) . . . . . . . . . . . . . . . . . . . . . . . . . 23Equipment qualification (3.913.96) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Ageing and wear-out mechanisms (3.973.101) . . . . . . . . . . . . . . . . . . . 25Humanmachine interface and the application of human factor engineering (3.1023.116) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27System interactions (3.1173.121) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

    This publication has been superseded by GSR Part 4 and SSG-2

  • Use of computational aids in the design process (3.1223.123) . . . . . . . 30

    4. SAFETY ANALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

    General guidance (4.14.32) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Postulated initiating events (4.334.49) . . . . . . . . . . . . . . . . . . . . . . . . . 36Deterministic safety analysis (4.504.122) . . . . . . . . . . . . . . . . . . . . . . . 39Probabilistic safety analysis (4.1234.231) . . . . . . . . . . . . . . . . . . . . . . . 54Sensitivity studies and uncertainty analysis (4.2324.235) . . . . . . . . . . . 74Assessment of the computer codes used (4.2364.244) . . . . . . . . . . . . . . 75

    5. INDEPENDENT VERIFICATION (5.15.10) . . . . . . . . . . . . . . . . . . . . 77

    REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80CONTRIBUTORS TO DRAFTING AND REVIEW . . . . . . . . . . . . . . . . . . . 81BODIES FOR THE ENDORSEMENT OF SAFETY STANDARDS . . . . . . . 83

    This publication has been superseded by GSR Part 4 and SSG-2

  • 1

    1. INTRODUCTION

    BACKGROUND

    1.1. This publication supports the Safety Requirements on the Safety of NuclearPower Plants: Design [1].

    1.2. This Safety Guide was prepared on the basis of a systematic review of all therelevant publications including the Safety Fundamentals [2], Safety of Nuclear PowerPlants: Design [1], current and ongoing revisions of other Safety Guides, INSAGreports [3, 4] and other publications that have addressed the safety of nuclear powerplants. This Safety Guide also provides guidance for Contracting Parties to theConvention on Nuclear Safety in meeting their obligations under Article 14 onAssessment and Verification of Safety.

    OBJECTIVE

    1.3. The Safety Requirements publication entitled Safety of Nuclear Power Plants:Design [1] states that a comprehensive safety assessment and an independent verifi-cation of the safety assessment shall be carried out before the design is submitted tothe regulatory body (see paras 3.103.13). This publication provides guidance on howthis requirement should be met.

    1.4. This Safety Guide provides recommendations to designers for carrying out asafety assessment during the initial design process and design modifications, as wellas to the operating organization in carrying out independent verification of the safetyassessment of new nuclear power plants with a new or already existing design. Therecommendations for performing a safety assessment are suitable also as guidance forthe safety review of an existing plant. The objective of reviewing existing plantsagainst current standards and practices is to determine whether there are any devia-tions which would have an impact on plant safety. The methods and the recommen-dations of this Safety Guide can also be used by regulatory bodies for the conduct ofthe regulatory review and assessment. Although most recommendations of this SafetyGuide are general and applicable to all types of nuclear reactors, some specificrecommendations and examples apply mostly to water cooled reactors.

    1.5. Terms such as safety assessment, safety analysis and independent verifica-tion are used differently in different countries. The way that these terms have been

    This publication has been superseded by GSR Part 4 and SSG-2

  • used in this Safety Guide is explained in Section 2. The term design as used hereincludes the specifications for the safe operation and management of the plant.

    SCOPE

    1.6. This Safety Guide identifies the key recommendations for carrying out thesafety assessment and the independent verification. It provides detailed guidance insupport of Ref. [1], particularly in the area of safety analysis. However, this does notinclude all the technical details which are available and reference is made to otherIAEA publications on specific design issues and safety analysis methods.

    1.7. Specific deterministic or probabilistic safety targets or radiological limits canvary in different countries and are the responsibility of the regulatory body. ThisSafety Gu...

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