This publication documents the results of an IAEA coordinated research project (CRP)on the application of computational fluid dynamics (CFD) codes for nuclear power plant design. The main objective was to benchmark CFD codes, model options and methods against CFD experimental data under single phase flow conditions. This publication summarizes the current capabilities and applications of CFD codes, and their present qualification level, with respect to nuclear power plant design requirements. It is not intended to be comprehensive, focusing instead on international experience in the practical application of these tools in designing nuclear power plant components and systems. The guidance in this publication is based on inputs provided by international nuclear industry experts directly involved in nuclear power plant design issues, CFD applications, and in related experimentation and validation highlighted during the CRP.

This publication reports on the DACCORD project, which supports Member States in preparing preliminary cost estimates for the decommissioning of research reactors. The report is of particular benefit to programmes with limited decommissioning experience. Costing projects for the decommissioning of research reactors can be broad in scope with many possible inputs and influences that require due consideration in developing the estimate. The publication provides information on unit factors for research reactor decommissioning and a basis for estimating uncertainties and contingencies and for assessing the impact of decommissioning planning and characterization activities. It also addresses the use of the CERREX?D2 (Cost Estimate for Research Reactors in Excel) software code, developed by the IAEA to enable non?specialist users to develop preliminary cost estimates for decommissioning.

This book encompasses many different topics in the field of nuclear safety and answers the need for an accessible introductory text to complement industry guidance. It focuses on the principles and applications of nuclear safety, guiding the reader through the 'why' and the 'how' of constructing a nuclear safety case. The theory is enhanced by the provision of examples on how safety cases may tackle a particular problem. Each nuclear site licensee has its own way of undertaking nuclear safety although there is much common ground. The book adopts a consensus approach to the various methodologies used in the industry and armed with such knowledge, an individual should have a good grounding for the application of nuclear safety in the manner required for their industry. Introduction to Nuclear Safety describes why we pursue nuclear safety, including the legal, financial and moral reasons. The fundamental concept of reducing risks to as low as reasonably practicable in the nuclear industry is discussed and the safety case life-cycle from design to commissioning to operations and decommissioning is described. Typical safety case methodologies are also discussed. In considering the applications of nuclear safety, examples of how to undertake an assessment are given. Producing a safety case is not solely a theoretical exercise; it must be implemented and adopted for use within the plant. Therefore, the book describes how safety case documents can be utilised within the plant. The book assumes only a relatively basic knowledge of physics, engineering and mathematics but the interested reader can find more detailed texts in the bibliography.

The International Conference on Research Reactors, held every four years, is one of the IAEA activities supporting countries in addressing the opportunities and challenges related to research reactor programmes. This publication presents a summary and other material from the 2019 conference. The main challenges the research reactor community is facing include the need to ensure regulatory effectiveness, manage the ageing of the facilities, ensure knowledge transfer, and improve utilization programmes and strategic planning. This conference provided a forum for reactor operators, managers, users, regulators, designers and suppliers to exchange best practices and learn from each other, particularly in addressing common issues, challenges and strategies. This resulted in a publication which provides a summary of the conference, the major findings and conclusions of the sessions, and the opening and closing addresses. The accompanying online files include the individual technical papers and presentations.

This Safety Report has been developed as part of the IAEA programme on occupational radiation protection to provide for the application of its safety standards in implementing a graded approach to the protection of workers against exposures associated with uranium mining and processing. The publication describes the methods of production associated with the uranium industry and provides practical information on the radiological risks to workers in the exploration, mining and processing of uranium. It is a compilation of detailed information on uranium mining and processing stages and techniques, general radiation protection considerations in the relevant industry, general methodology applicable for control, monitoring and dose assessment, exposure pathways, and radiation protection programs for the range of commonly used mining and processing techniques.

Atomic Age America looks at the broad influence of atomic energy?focusing particularly on nuclear weapons and nuclear power?on the lives of Americans within a world context. The text examines the social, political, diplomatic, environmental, and technical impacts of atomic energy on the 20th and 21st centuries, with a look back to the origins of atomic theory.

Is nuclear power a thing of the past or a technology for the future? Has it become too expensive and dangerous, or is it still competitive and sufficiently safe? Should emerging countries invest in it? Can we trust calculations of the probability of a major nuclear accident? In the face of divergent claims and contradictory facts, this book provides an in-depth and balanced economic analysis of the main controversies surrounding nuclear power. Without taking sides, it helps readers gain a better understanding of the uncertainties surrounding the costs, hazards, regulation and politics of nuclear power. Written several years on from the Fukushima Daiichi nuclear disaster of 2011, this is an important resource for students, researchers, energy professionals and concerned citizens wanting to engage with the continuing debate on the future of nuclear power and its place in international energy policy.

On September 27 - October 3, 2008 the NATO Advanced Research Workshop (ARW) on progress in high-energy physics and nuclear safety was held in Yalta, Crimea (see: http: //crimea.bitp.kiev.ua and http: //arw.bitp.kiev.ua). Nearly 50 leading experts in high-energy and nuclear physics from Eastern and Western Europe as well as from North America participated at the Workshop. The topics of the ARW covered recent results of theoretical and experimental studies in high-energy physics, accelerator, detection and nuclear technologies, as well as problems of nuclear safety in high-energy experimentation and in nuclear - dustry. The forthcoming experiments at the Large Hadron Collider (LHC) at CERN and cosmic-ray experiments were among the topics of the ARW. An important aspect of the Workshop was the scienti?c collaboration between nuclear physicists from East and West, especially in the ?eld of nuclear safety. The present book contains a selection of invited talks presented at the ARW. The papers are grouped in two part

The present report is a revision of Safety Series No. 75-INSAG-3 (1988), updating the statements made on the objectives and principles of safe design and operation for electricity generating nuclear power plants. It includes the improvements made in the safety of operating nuclear power plants and identifies the principles underlying the best current safety policies to be applied in future plants. It presents INSAG's understanding of the principles underlying the best current safety policies and practices of the nuclear power industry.

Nuclear Reactor Technology Development and Utilization presents the theory and principles of the most common advanced nuclear reactor systems and provides a context for the value and utilization of nuclear power in a variety of applications both inside and outside a traditional nuclear setting. As countries across the globe realize their plans for a sustainable energy future, the need for innovative nuclear reactor design is increasing, and this book will provide a deep understanding of how these technologies can aid in a region's goal for clean and reliable energy. Dr Khan and Dr Nakhabov, alongside their team of expert contributors, discuss a variety of important topics, including nuclear fuel cycles, plant decommissioning and hybrid energy systems, while considering a variety of diverse uses such as nuclear desalination, hydrogen generation and radioisotope production. Knowledge acquired enables the reader to conduct further research in academia and industry, and apply the latest design, development, integration, safety and economic guidance to their work and research.

Only several years after the collapse of the Soviet Union, nuclear security issues are again at the forefront of international concern. This timely collection addresses issues of cleanup at Chernobyl and other sites of nuclear disasters, nuclear smuggling, safety concerns in the Ukrainian and Russian nuclear industries, and Ukraine's negotiations with Russia and the West regarding the transference of its nuclear weapons to Russia. Preeminent scholars in their fields, the contributors provide up-to-the-minute information and fresh insights into questions critical to the future of the former Soviet Union and to Russian and Ukrainian relations with the West.

For many years, as a direct result of international governmental concern, the nuclear power industry has been at the forefront of industrial safety. This text represents a cross-disciplinary look at the human factors developments in this industry, with wider applications for the entire industrial sector. Technical, psychological and social aspects of industrial safety come under the scrutiny of scientists and engineers from an array of different backgrounds. The contributors are international safety scientists from the USA, Japan and Europe, and their chapters deal with a variety of issues: from theoretical aspects of applicable cultural models, to reviews of actual safety performance in specific plants.

Looking at the politics of nuclear waste, this book examines the subject from an international standpoint. Other works by the author Andrew Blowers include "The Limits of Power" and "Something in the Air", and he has been co-editor on books such as "Nuclear Power in Crisis".

This Safety Guide, prepared jointly by the International Atomic Energy Agency (IAEA) and the International Labour Organization (ILO), provides guidance on fulfilling the requirements of the International Basic Safety Standards (IAEA Safety Standards Series No. GSR Part 3) with respect to occupational exposure. It provides general guidance on the development of occupational radiation protection programmes as appropriate for the sources of radiation likely to be encountered in the workplaces in question to fulfil the management's responsibility for protection and safety. Detailed guidance is also provided on the monitoring and assessment of workers' exposure due to external radiation sources and from intakes of radionuclides. The Safety Guide reflects the current internationally accepted principles and recommended good practices in occupational radiation protection, with account taken of the conceptual changes and technological enhancements that have occurred over the past decade.

A number of IAEA Member States generate relatively small quantities of radioactive waste and/or disused sealed sources in research or in the application of nuclear techniques in medicine and industry. This publication presents a modular approach to the design of waste processing and storage facilities to address the needs of such Member States with a cost effective and flexible solution that allows easy adjustment to changing needs in terms of capacity and variety of waste streams. The key feature of the publication is the provision of practical guidance to enable the users to determine their waste processing and storage requirements, specify those requirements to allow the procurement of the appropriate processing and storage modules and install and eventually operate those modules.

The identification and assessment of threats provides an essential basis for the selection, design, and implementation of nuclear security measures. For nuclear material and other radioactive material that is under regulatory control, and associated facilities and activities, the results of this identification and assessment are expressed as a design basis threat or representative threat statement describing the intentions and capabilities of potential adversaries against which the materials and associated facilities and activities are to be protected. An Implementing Guide was issued in 2009 under the title of Development, Use and Maintenance of the Design Basis Threat which was updated and revised. The result of this revision is the current publication. It provides a stepbystep methodology for conducting a national nuclear security threat assessment including both physical and computer security aspects, and for the development, use and maintenance of design basis threats and representative threat statements.

Since the 1970s, the IAEA has been involved in the analysis of fuel failures in water cooled reactors in normal (nonaccident) operational conditions. This updated version of IAEA Nuclear Energy Series No. NFT2.1 provides information on all aspects of fuel failures in current nuclear power plant operations. It summarizes fuel failure occurrences and their mechanisms and root causes, as well as fuel failure prevention and management in plant operation for 97% of light and heavy water cooled nuclear power units operated worldwide during the period 2006-2015. Data on fuel failures from 1987 to 2006 extracted from three previous IAEA fuel failure reports are included and analysed in the present publication, together with the 2006-2015 fuel failure data, to reveal long term tendencies in fuel performance. In addition to fuel rod leakers, fuel structural damages and other fuel assembly issues are considered in the report.

This publication summarizes the reviewed information distributed in previous IAEA publications and provides an up to date, overall picture of the management of disused sealed radioactive sources (DSRSs) based upon the current status and trends in this field. It incorporates the most recent experience in source management, including newly developed techniques used for DSRS conditioning and storage. Problems encountered and lessons learned are also highlighted in the publication in order to help avoid the mistakes commonly made in the past in managing disused sources.

As Member States seek to extend the operating lifetime of nuclear power plants beyond that which was originally licensed, safety oversight of ageing management and long term operation (LTO) has become increasingly important. This Safety Report provides technical and practical information based on existing regulatory approaches and practices of Member States, and the application of the IAEA Safety Standards. This includes requirements and pre?conditions of the regulatory body for LTO, authorization processes applied to LTO, and regulatory practices and documentation to prepare for and implement LTO. The report is intended for nuclear safety authorities, operating organizations, licensees, manufacturers, designers and technical support organizations considering authorization for LTO of nuclear power plants.

Radiological environmental impact assessment models are important tools for public and environmental protection, for example, in planning measures to be taken in the event of accidental releases. This publication was developed to report on results from international model validation exercises conducted within the IAEA's MODARIA I programme to test and improve the modelling for predictions used for environmental transfer and dose assessment in urban areas. Model exercises were focused on: contamination densities and activity concentrations in air following short range atmospheric dispersion and deposition events; prediction of atmospheric dispersion and application of decision support systems under complex meteorological and topographic conditions; and expected reductions in ambient dose rates and activity concentrations due to protective actions following a nuclear accident. The report builds on past IAEA publications and provides relevant examples for use in strengthening the global nuclear safety framework as part of emergency preparedness and response planning following a nuclear or radiological emergency.

Recent decades have seen a significant increase in the number of decommissioning projects undertaken globally. Decommissioning technologies have advanced, driven by innovations in digitization and robotics, and the Systematic Approach to Training (SAT) methodology is now being applied to the decommissioning phase of all types of nuclear facilities. This publication provides practical information and examples of good practices in training personnel for decommissioning activities, based on Member States' experience, including guidance on the application of SAT methodology. The increasing use of digital and web?based tools to enhance competence development for implementation of decommissioning programmes is also discussed.

Each year billions of dollars are being spent in the area of nuclear power generation to design, construct, manufacture, operate, and maintain various types of systems around the globe. Many times these systems fail due to safety, reliability, human factors, and human error related problems. The main objective of this book is to combine nuclear power plant safety, reliability, human factors, and human error into a single volume for those individuals that work closely during the nuclear power plant design phase, as well as other phases, thus eliminating the need to consult many different and diverse sources in obtaining the desired information.

The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) established by the General Assembly in 1955 assesses the levels and effects of exposure to ionizing radiation on human health and the environment. This is the third of four volumes of scientific annexes provide the supporting scientific deliberations for the UNSCEAR 2020/2021 report to the General Assembly. Annex C "Biological mechanisms relevant for the inference of cancer risks from low dose and low-dose rate radiation" synthesizes the current knowledge on biological mechanisms of radiation actions at low doses and low-dose-rates, and assesses the implications for understanding the processes of cancer development after exposure to ionizing radiation, and for dose-response relationships of radiation-induced cancers.

The issue of nuclear power has become a polarizing one, especially in light of the increasing need for sustainable energy sources, and events like the 2011 nuclear disaster in Japan. The public has been largely wary and even fearful of a reliance on nuclear power, pointing to the reactor meltdown in Chernobyl or the Three-Mile Island accident as evidence that nuclear power is an unfeasible and dangerous source of energy. However, with these fears come misconceptions about the science behind nuclear power, and many arguments made against it lack the scientific grounding needed to contribute to the debate. At the same time, clean-energy sources like wind and solar have failed to prove that they can be used on a large enough scale to be relied upon. In Why We Need Nuclear Power: The Environmental Case, experienced radiation biologist Michael H. Fox replaces the misconceptions about nuclear power with real science, and argues that it may be the best source of energy both for large-scale use and slowing the effects of global warming. Fox relies on thirty-five years of experience studying the biological effects of radiation to explore the issues surrounding nuclear power, addressing which of the public's concerns on the issue are valid, and which are unsupported by science. He shows that nuclear power has crucial strategic importance in reducing the large amounts of carbon dioxide released into the atmosphere by burning fossil fuels. This is the first book to lay out clearly what we know about the biological effects of radiation, and what science we use to know it. Why We Need Nuclear Power is a critical resource for anyone looking to understand the facts of the nuclear power issue, and what role nuclear power could play in reducing the environmental impact of the world's energy consumption.

This Safety Guide provides recommendations and guidance on achieving and demonstrating compliance with IAEA Safety Standards Series No. SSR-6 (Rev. 1), Regulations for the Safe Transport of Radioactive Material (2018 Edition), which establishes the requirements to be applied to the national and international transport of radioactive material. Transport is deemed to comprise all operations and conditions associated with and involved in the movement of radioactive material, including the design, fabrication and maintenance of packaging, and the preparation, consigning, handling, carriage, storage in transit, shipment after storage and receipt at the final destination of packages. The Advisory Material is not a stand-alone text. It is to be used concurrently as a companion to the IAEA Safety Standards Series No. SSR-6 (Rev. 1) and each paragraph of this guide is numbered correspondingly to the paragraph of the Regulations to which it most directly relates.