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Design Extension Conditions and the Concept of Practical Elimination in the Design of Nuclear Power Plants
By IAEA
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About this ebook
The objective of this Safety Guide is to provide recommendations for the design of new nuclear power plants related to defense in depth and the practical elimination of plant event sequences that could lead to an early radioactive release or a large radioactive release. It also provides recommendations in relation to design aspects of defense in depth, in particular on those aspects associated with design extension conditions. Since the introduction of the term "practical elimination" in the early 90's and the recognition that accident conditions could include design extension conditions without significant fuel degradation and design extension conditions with core melting, those topics have been the subject of extensive discussions and several publications. The purpose of this publication is to facilitate international consensus on the understanding of those topics among regulators and designers and to provide recommendations for their consistent implementation in relevant nuclear power plant designs. In particular, this Specific Safety Guide gives recommendations related to the demonstration of the implementation of the practical elimination concept for those plant event sequences that could lead to an early radioactive release or a large radioactive release, which relies on the physical impossibility or on the high-level confidence that they are extremely unlikely to arise.
LanguageEnglish
PublisherInternational Atomic Energy Agency
Release dateFeb 6, 2024
ISBN9789201305237
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Design Extension Conditions and the Concept of Practical Elimination in the Design of Nuclear Power Plants - IAEA
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DESIGN EXTENSION CONDITIONS
AND THE CONCEPT OF
PRACTICAL ELIMINATION
IN THE DESIGN OF
NUCLEAR POWER PLANTS
IAEA SAFETY STANDARDS SERIES No. SSG-88
DESIGN EXTENSION CONDITIONS
AND THE CONCEPT OF
PRACTICAL ELIMINATION
IN THE DESIGN OF
NUCLEAR POWER PLANTS
Specific Safety Guide
INTERNATIONAL ATOMIC ENERGY AGENCY
VIENNA, 2024
COPYRIGHT NOTICE
All IAEA scientific and technical publications are protected by the terms of the Universal Copyright Convention as adopted in 1952 (Berne) and as revised in 1972 (Paris). The copyright has since been extended by the World Intellectual Property Organization (Geneva) to include electronic and virtual intellectual property. Permission to use whole or parts of texts contained in IAEA publications in printed or electronic form must be obtained and is usually subject to royalty agreements. Proposals for non-commercial reproductions and translations are welcomed and considered on a case-by-case basis. Enquiries should be addressed to the IAEA Publishing Section at:
Marketing and Sales Unit, Publishing Section
International Atomic Energy Agency
Vienna International Centre
PO Box 100
1400 Vienna, Austria
fax: +43 1 26007 22529
tel.: +43 1 2600 22417
email: [email protected]
www.iaea.org/publications
© IAEA, 2024
Printed by the IAEA in Austria
January 2024
STI/PUB/2055
https://doi.org/10.61092/iaea.la1m-dy8m
IAEA Library Cataloguing in Publication Data
Names: International Atomic Energy Agency.
Title: Design extension conditions and the concept of practical elimination in the design of nuclear power plants / International Atomic Energy Agency.
Description: Vienna : International Atomic Energy Agency, 2024. | Series: IAEA safety standards series, ISSN 1020-525X ; no. SSG-88 | Includes bibliographical references.
Identifiers: IAEAL 23-01641 | ISBN 978-92-0-130323-3 (paperback : alk. paper) | ISBN 978-92-0-130423-0 (pdf) | ISBN 978-92-0-130523-7 (epub)
Subjects: LCSH: Nuclear power plants — Design and construction. | Nuclear power plants — Safety measures. | Nuclear facilities.
Classification: UDC 621.039.58 | STI/PUB/2055
FOREWORD
by Rafael Mariano Grossi
Director General
The IAEA’s Statute authorizes it to establish…standards of safety for protection of health and minimization of danger to life and property
. These are standards that the IAEA must apply to its own operations, and that States can apply through their national regulations.
The IAEA started its safety standards programme in 1958 and there have been many developments since. As Director General, I am committed to ensuring that the IAEA maintains and improves upon this integrated, comprehensive and consistent set of up to date, user friendly and fit for purpose safety standards of high quality. Their proper application in the use of nuclear science and technology should offer a high level of protection for people and the environment across the world and provide the confidence necessary to allow for the ongoing use of nuclear technology for the benefit of all.
Safety is a national responsibility underpinned by a number of international conventions. The IAEA safety standards form a basis for these legal instruments and serve as a global reference to help parties meet their obligations. While safety standards are not legally binding on Member States, they are widely applied. They have become an indispensable reference point and a common denominator for the vast majority of Member States that have adopted these standards for use in national regulations to enhance safety in nuclear power generation, research reactors and fuel cycle facilities as well as in nuclear applications in medicine, industry, agriculture and research.
The IAEA safety standards are based on the practical experience of its Member States and produced through international consensus. The involvement of the members of the Safety Standards Committees, the Nuclear Security Guidance Committee and the Commission on Safety Standards is particularly important, and I am grateful to all those who contribute their knowledge and expertise to this endeavour.
The IAEA also uses these safety standards when it assists Member States through its review missions and advisory services. This helps Member States in the application of the standards and enables valuable experience and insight to be shared. Feedback from these missions and services, and lessons identified from events and experience in the use and application of the safety standards, are taken into account during their periodic revision.
I believe the IAEA safety standards and their application make an invaluable contribution to ensuring a high level of safety in the use of nuclear technology. I encourage all Member States to promote and apply these standards, and to work with the IAEA to uphold their quality now and in the future.
The authoritative versions of the publications are the hard copies issued and available as PDFs on www.iaea.org/publications.To create the versions for e-readers, certain changes have been made, including the movement of some figures and tables.
THE IAEA SAFETY STANDARDS
BACKGROUND
Radioactivity is a natural phenomenon and natural sources of radiation are features of the environment. Radiation and radioactive substances have many beneficial applications, ranging from power generation to uses in medicine, industry and agriculture. The radiation risks to workers and the public and to the environment that may arise from these applications have to be assessed and, if necessary, controlled.
Activities such as the medical uses of radiation, the operation of nuclear installations, the production, transport and use of radioactive material, and the management of radioactive waste must therefore be subject to standards of safety.
Regulating safety is a national responsibility. However, radiation risks may transcend national borders, and international cooperation serves to promote and enhance safety globally by exchanging experience and by improving capabilities to control hazards, to prevent accidents, to respond to emergencies and to mitigate any harmful consequences.
States have an obligation of diligence and duty of care, and are expected to fulfil their national and international undertakings and obligations.
International safety standards provide support for States in meeting their obligations under general principles of international law, such as those relating to environmental protection. International safety standards also promote and assure confidence in safety and facilitate international commerce and trade.
A global nuclear safety regime is in place and is being continuously improved. IAEA safety standards, which support the implementation of binding international instruments and national safety infrastructures, are a cornerstone of this global regime. The IAEA safety standards constitute a useful tool for contracting parties to assess their performance under these international conventions.
THE IAEA SAFETY STANDARDS
The status of the IAEA safety standards derives from the IAEA’s Statute, which authorizes the IAEA to establish or adopt, in consultation and, where appropriate, in collaboration with the competent organs of the United Nations and with the specialized agencies concerned, standards of safety for protection of health and minimization of danger to life and property, and to provide for their application.
With a view to ensuring the protection of people and the environment
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