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    Publications and Reports
    CSNI Status Report and Perspectives: Advances in the Analysis and Management of Accidents and Future Challenges

    10.1787/6b12e37e-en

    The Nuclear Energy Agency (NEA) Working Group on the Analysis and Management of Accidents (WGAMA) aims to contribute to the assessment of the prevention, mitigation and management...

    English Performance assessments WGAMA Nuclear safety Nuclear security Security CSNI PRG Safety assessment CSNI Safety Technology Safety research Knowledge management and data preservation Accident management …
    Published date: 12 June 2025
    NEA Document
    Reactor Core and Containment Cooling Systems: Long-Term Management and Reliability (RCCS-2021) NEA Specialist Workshop Proceedings 18-20 October 2021 Virtual Meeting
    NEA/CSNI/R(2022)11

    The specialist workshop entitled “Reactor Core and Containment Cooling Systems: Long-term Management and Reliability (RCCS-2021)” was organised by the Nuclear Energy Agency (NEA) as part of the activ...

    WGAMA Nuclear safety Accident analysis and management Nuclear safety research CSNI PRG CSNI Safety Reactor technology Accident management …
    Published date: 16 June 2025
    NEA Document
    Rod Bundle Heat Transfer (RBHT) Project Phase I Summary Report
    NEA/CSNI/R(2023)7

    The NEA Rod Bundle Heat Transfer (RBHT) project focused on reflood thermal hydraulics. The project generated new and unique reflood experimental data and provided these data to the participants, who ...

    Nuclear safety CSNI PRG CSNI Safety Safety research …
    Published date: 16 June 2025
    Publications and Reports
    CSNI Technical Opinion Paper No. 21: Research Recommendations to Support the Safe Deployment of Small Modular Reactors

    10.1787/0df32944-en

    While there is a growing interest in the deployment of small modular reactors (SMRs) as a promising option to help mitigate climate change, further international efforts are neede...

    English SMR EGSMR Nuclear safety Nuclear safety research CSNI Safety research …
    Published date: 12 June 2025
    Publications and Reports
    Nuclear Safety Research in OECD Countries

    DOI: 10.1787/g2gh1c79-en

    ISBN-13: 9789264155091

    Major nuclear safety research facilities and programmes are facing increasing budgetary constraints, and in many cases are being closed or terminated. ...

    English CSNI Joint project Nuclear safety regulation
    Published date: 12 June 2025
    Event
    Pipe Integrity Workshop
    23 - 25 September 2025
    Paris, France

    The Metal Subgroup of the NEA Working Group on Integrity and Ageing of Components and Structures (WGIAGE) will organise the Pipe Integrity Workshop to:

    • present the outcomes from the three piping int...
    Nuclear installations WGIAGE Nuclear safety Regulation Nuclear safety research LTO CSNI …
    Published date: 12 June 2025
    Activity
    Expert Group on Small Modular Reactors (EGSMR)

    With the growing importance of SMRs, following the proposal of the CSNI Bureau, the CSNI has decided to create an Expert Group on SMRs (EGSMR), at its 69th meeting held on 2-3 June 2021.

    SMR EGSMR Nuclear safety research CSNI
    Published date: 6 June 2025
    News
    NEA seminar on transfer of thermal-hydraulic and severe accident knowledge

    The THICKET-5 seminar was given by the Committee on the Safety of Nuclear Installations.

    Risk assessment News brief WGAMA Accident analysis and management Nuclear safety research CSNI Safety Accident management Risk …
    Published date: 2 June 2025
    Publications and Reports
    The Safety of the Nuclear Fuel Cycle

    DOI: 10.1787/g2gh1c14-en

    English WGFCS CSNI Safety Nuclear safety regulation …
    Published date: 4 June 2025
    NEA Document
    Concepts and Terminology for Protecting Nuclear Installations from Flood Hazards
    NEA/CSNI/R(2020)9

    This report provides insights from a survey of Nuclear Energy Agency (NEA) member countries on the concepts used to establish effective measures to cope with external flooding hazards and on the term...

    Nuclear safety External hazards External hazards and nuclear safety Nuclear safety research CSNI …
    Published date: 5 October 2022
    NEA Document
    Benchmark on External Events Hazard Frequency and Magnitude Statistical Modelling
    NEA/CSNI/R(2021)10

    At its 61st meeting, the CSNI approved the recommended task on the benchmark on external events hazard frequency and magnitude statistical modelling, to be pursued by the WGEV. Modelling of these ext...

    Fukushima Nuclear safety External hazards Nuclear technology WGEV Nuclear safety research CSNI PRG CSNI Joint project Safety Benchmark …
    Published date: 11 June 2024
    Event
    First EGSMR Workshop on SMR Safety Assessment: From challenges to achievement
    20 - 21 November 2025
    NEA Headquarters, 46 quai Alphonse Le Gallo, 92100 Boulogne-Billancourt, France

    As interest in advanced nuclear technologies continues to grow, Small Modular Reactors (SMRs) are presented as a promising solution for clean, flexible and scalable energy generation. To support the ...

    SMR EGSMR CSNI Safety
    Published date: 2 June 2025
    NEA Document
    Examination of Approaches for Screening External Hazards for Nuclear Power Plants
    NEA/CSNI/R(2018)7

    It has long been recognised that external hazards can present a potential common cause source of initiating events that could challenge nuclear power plant safety. Modelling of these hazards is a com...

    English WGEV Nuclear safety research CSNI
    Published date: 2 April 2019
    Publications and Reports
    Long-Term Management and Actions for a Severe Accident in a Nuclear Power Plant

    As the Fukushima Daiichi nuclear power plant (NPP) accident illustrates, many challenges have to be faced in maintaining safety over the long term in a damaged NPP following a severe accident. These ...

    English Three Mile Island Fukushima WGAMA Chernobyl Accident analysis and management Nuclear safety research CSNI Accident management …
    Published date: 29 April 2021
    NEA Document
    Riverine Flooding: Hazard Assessment and Protection of Nuclear Installations
    NEA/CSNI/R(2018)14

    Workshop Proceedings
    21-23 March 2018, Paris, France

    The WGEV “Riverine Flooding – Hazard Assessment and Protection of NPPs” task was designed to share regulatory practices and technical approaches fo...

    English WGEV CSNI Proceedings
    Published date: 7 September 2020
    Publications and Reports
    Reactivity-Initiated Accident Fuel Rod Codes Benchmark Phases I-III: Synthesis Report

    One of the key areas in fuel safety is the analysis of fuel behaviour under reactivity-initiated accident conditions. Reactivity-initiated accident fuel rod codes have been developed for a significan...

    Fuel in nuclear safety English Nuclear safety research CSNI WGFS …
    Published date: 13 April 2022
    NEA Document
    Proceedings of the CSNI workshop on ductile fracture test methods (2nd : 1985 : Paris, France), 1985.
    NEA/CSNI(1985)105
    English CSNI Proceedings
    Published date: 1 January 1985
    NEA Document
    Understanding the Impact of External Hazards on Nuclear Facilities: Severe Weather and Storm Surge
    NEA/CSNI/R(2017)13
    The March 2011 accident at Fukushima Daiichi nuclear power plant triggered discussions about the natural external events that are low-frequency but high-consequence. In order to address these issues...
    English WGEV Nuclear safety research CSNI Proceedings …
    Published date: 16 April 2018
    NEA Document
    Probabilistic Safety Assessment (PSA) of Natural External Hazards Including Earthquakes
    NEA/CSNI/R(2014)9

    The Fukushima Dai-ichi accident triggered discussions about the significance of external hazards and their treatment in safety analyses. In addition, stress tests results have shown vulnerabilities a...

    English WGRISK WGIAGE Nuclear safety research CSNI Proceedings Probabilistic risk assessment …
    Published date: 2 July 2014
    Activity
    Working Group on External Events (WGEV)

    The main mission of the Working Group on External Events (WGEV) is to improve the understanding and treatment of external hazards that would support the continued safety performance of nuclear instal...

    Risk assessment WGRISK External hazards WGEV External hazards and nuclear safety Nuclear safety research CSNI Safety Risk …
    Published date: 10 February 2022
    News
    Loss of Forced Coolant (LOFC) joint project extended to 2027

    The project brings together seven NEA member countries.

    News brief Generation IV reactors Gas-cooled reactors Accident analysis and management Nuclear safety research CSNI Joint project Accident management …
    Published date: 24 April 2025
    Joint project
    Experiments on Source Term for Delayed Releases (ESTER) Project

    CHIP experimental facility to study fission product transport and deposition in the primary circuit. Photo: ASNR

    Following several years of experimental research on source term analysis conducted und...

    Accident analysis and management Nuclear safety research CSNI Joint project Accident management …
    Published date: 24 April 2025
    NEA Document
    ICDE Project report: Lessons learnt from common-cause failures of motor-operated valves
    NEA/CSNI/R(2021)7

    This report presents a study performed on a set of common cause failure (CCF) events of motor operated valves (MOV) within the International Common Cause Failure Data Exchange (ICDE) project. In July...

    Nuclear safety Nuclear safety research CSNI PRG Databases CSNI Joint project Safety …
    Published date: 7 April 2025
    Activity
    Working Group on Fuel Safety (WGFS)

    The main mission of the Working Group on Fuel Safety (WGFS) is to advance the current understanding and address cross-cutting issues related to fuel behaviour in accident conditions, including work o...

    Fuel in nuclear safety Nuclear fuel Fuel studies WGAMA WGFCS Fuel cycle facility safety Nuclear safety research CSNI Safety WGFS …
    Published date: 4 April 2025
    Joint project
    International Common-cause Failure Data Exchange (ICDE) Project

    Scheme showing the technical scope of NEA ICDE project activities, NEA 

    Common-cause failure (CCF) events can significantly affect the availability of safety systems of nuclear power plants. In recog...

    Risk assessment Nuclear safety research CSNI Probabilistic risk assessment
    Published date: 4 April 2025
    NEA Document
    ICDE Topical Report Operational Experience on Common-Cause Failures due to External Environmental Factors
    NEA/CSNI/R(2020)15

    This report presents a study performed on a set of common-cause failure (CCF) events within the International Common-cause failure Data Exchange (ICDE) project. The topic of the study was external fa...

    Nuclear safety Nuclear technology Nuclear safety research CSNI PRG Databases CSNI Joint project Safety Safety research …
    Published date: 4 April 2025
    News
    Loss of Forced Coolant joint project extended

    Participants  in the NEA joint project Loss of Forced Coolant (LOFC) discussed key experimental findings on 10-11 March 2025.

    News brief Accident analysis and management Nuclear safety research CSNI Joint project Gas-cooled reactors Accident management …
    Published date: 2 April 2025
    News
    Advancing the CSNI Code Validation Matrix: Extension for novel technologies

    The CSNI Code Validation Matrix (CCVM) is a repository of nuclear data and identified phenomena used to run tests, experiments and other procedures to ensure safety assessments and related operationa...

    News brief Accident analysis and management Nuclear safety research Safety assessment CSNI Safety Risk Risk assessment Accident management …
    Published date: 25 March 2025
    NEA Document
    NEA Kappa Workshop on Earthquake Ground Motions on Rock Sites 25-28 May 2021
    NEA/CSNI/R(2023)10

    The objective of this “Kappa Workshop on Earthquake Ground Motions on Rock Sites” (held remotely from 25-28 May 2021), organised by the NEA Working Group on Integrity and Ageing of Components and Str...

    WGIAGE Nuclear safety Nuclear safety research CSNI PRG CSNI …
    Published date: 17 March 2025
    NEA Document
    Best Practice Guidelines for the Use of CFD in Nuclear Reactor Safety Applications – 2024 Update
    NEA/CSNI/R(2022)10

    The aim of this second revision of the Best Practice Guidelines (BPG) is to provide guidance to the user of computational fluid dynamics (CFD) codes, both novice and experienced, in the field of nucl...

    Nuclear safety Nuclear safety research CSNI PRG CSNI Safety Safety of components and structures Reactor technology Safety research CFD Best practices …
    Published date: 19 March 2025
    NEA Document
    SOCRAT (Seismic Simulation of Overhead Crane on Shaking Table) International Benchmark Final Report
    NEA/CSNI/R(2023)11

    Background
    Bridge cranes, which are components that handle devices designed to lift and transfer heavy loads, are widely used in the nuclear sector. Assessing the dynamic behaviour of bridge cranes is...

    Nuclear safety Nuclear safety research CSNI PRG CSNI Safety Benchmark Safety research …
    Published date: 19 March 2025
    Activity
    Committee on the Safety of Nuclear Installations (CSNI)

    The Committee on the Safety of Nuclear Installations (CSNI) is responsible for NEA programmes and activities that support maintaining and advancing the scientific and technical knowledge base of the ...

    Fuel in nuclear safety Risk assessment Accident analysis and management Fuel cycle facility safety Safety of electrical systems External hazards and nuclear safety Nuclear safety research CSNI Safety Safety of components and structures …
    Published date: 10 October 2023
    NEA Document
    Proceedings of the International Workshop on Developments in Safety Assessment Approaches and Safety Management Practices of Fuel Cycle Facilities
    NEA/CSNI/R(2021)5

    The Working Group on Fuel Cycle Safety (WGFCS), which is part of the Committee on the Safety of Nuclear Installation (CSNI) of the Nuclear Energy Agency (NEA), held an international workshop on devel...

    Nuclear fuel Fuel studies France Nuclear safety WGFCS CSNI PRG Safety assessment CSNI Safety Nuclear fuel cycle …
    Published date: 10 February 2025
    Activity
    Working Group on Analysis and Management of Accidents (WGAMA)

    The Working Group on the Analysis and Management of Accidents (WGAMA) focuses on the NEA activities related to potential design-basis and beyond design-basis accidents in nuclear reactors and related...

    Risk assessment WGAMA Accident analysis and management Nuclear safety research CSNI Safety Accident management Risk …
    Published date: 4 February 2025
    Joint project
    Reduction of Severe Accident Uncertainties (ROSAU) Project

    Left: Test facility for qualification of melt spreading tests. Photo: Argonne National Laboratory (ANL).
    Right: Example of corium melt pouring for a melt spreading preparatory test. Photo: Argonne Nat
    ...

    Accident analysis and management Nuclear safety research CSNI Safety Safety research …
    Published date: 4 February 2025
    Joint project
    Cabri International Project (CIP)

    Cabri Reactor (Commissariat à l’énergie atomique et aux énergies alternatives)

    The Cabri International Project (CIP) began in March 2000 to study the behaviour of nuclear fuel rods and cladding durin...

    Fuel in nuclear safety Nuclear fuel Nuclear safety research CSNI
    Published date: 3 February 2025
    Joint project
    Loss of Forced Coolant (LOFC) Project

    JAEA  High-temperature Engineering Test Reactor. Photo: Japan Atomic Energy Agency (JAEA)

     

    The Committee on the Safety of Nuclear Installations (CSNI) Task Group on Advanced Reactor Experimental Faci...

    Generation IV reactors Gas-cooled reactors Accident analysis and management Nuclear safety research CSNI Joint project …
    Published date: 3 February 2025
    Joint project
    Studsvik Cladding Integrity Project (SCIP)

    Left: Scheme of Studsvik LOCA test facility Right: Microstructure of fragmented nuclear fuel, Studsvik

    On this page

    • SCIP phases
      • First phase (2004-2009)
      • Second phase (2009-2014)
      • Third phase (2014-2...
    Fuel in nuclear safety Nuclear fuel Fuel cycle facility safety Nuclear safety research CSNI Back-end …
    Published date: 3 February 2025
    Joint project
    Preparatory Study on Analysis of Fuel Debris (PreADES) Project

    End state of debris in the units 1-3 of Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company Holdings. Photo: Japan Atomic Energy Agency

    The Preparatory Study on Analysis of Fuel D...

    Fukushima Accident analysis and management Nuclear safety research CSNI Safety Safety research …
    Published date: 3 February 2025
    Joint project
    High Energy Arcing Fault Events (HEAF) Project

    A cabinet containing copper bus before the HEAF test (left) and after the test(right). Source: NRC

    Massive electrical discharges, referred to as high energy arcing faults (HEAF), have occurred in nuc...

    Risk assessment Electrical systems Fuel cycle facility safety Safety of electrical systems Nuclear safety research CSNI …
    Published date: 3 February 2025
    Joint project
    Halden Human Technology Organisation (HTO) Project

                  Halden Hammlab research facility for human factor research.

    The NEA Halden HTO Project is a continuation of Man-Technology-Organisation (MTO) research carried out for more than 40 years as part of t...

    Human aspects of nuclear safety Human and organisational factors Nuclear safety research CSNI Joint project …
    Published date: 3 February 2025
    Joint project
    Fukushima Daiichi Nuclear Power Station Accident Information Collection and Evaluation (FACE) Project

    Appearance of Unit 1 and 2 reactor buildings at Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company Holdings (June 2022). Photo: Japan Nuclear Regulation Authority

    The FACE projec...

    Fukushima Accident analysis and management Nuclear safety research CSNI Joint project Accident management …
    Published date: 3 February 2025
    Joint project
    Advanced Thermal-hydraulic Test Loop for Accident Simulation (ATLAS) Project

    View of the ATLAS experimental loop. KAERI, Korea

    The Advanced Thermal-hydraulic Test Loop for Accident Simulation (ATLAS) is a thermal-hydraulic integral effect test facility for advanced light wate...

    Accident analysis and management Thermal hydraulics Nuclear safety research CSNI Accident management …
    Published date: 29 January 2025
    Joint project
    Halden Reactor Project - Fuels and Material

    The Halden Reactor Project has been in operation at the Institute for Energy Technology (IFE) in Norway since 1958 and is the oldest NEA joint project. It brings together a large international techni...

    Fuel in nuclear safety Nuclear fuel Nuclear safety research LTO CSNI Joint project Safety of components and structures …
    Published date: 29 January 2025
    Joint project
    Halden Reactor Project - Fuels and Material

    The Halden Reactor Project has been in operation at the Institute for Energy Technology (IFE) in Norway since 1958 and is the oldest NEA joint project. It brings together a large international techni...

    Fuel in nuclear safety Nuclear fuel Nuclear safety research LTO CSNI Joint project Safety of components and structures …
    Published date: 26 April 2024
    News
    NEA committees on nuclear safety and regulatory activities discuss progress

    CSNI and CNRA members gathered for bi-annual meetings.

    News brief CNRA Nuclear safety Regulation CSNI Safety research …
    Published date: 3 January 2025
    NEA Document
    Proceedings of International Workshop on Chemical Hazards in Fuel Cycle Facilities Nuclear Processing
    NEA/CSNI/R(2019)9

    Chemical hazards are an important subject for Fuel Cycle facilities, including various chemical processes and substances such as explosions and healthy risks. On 17-18 April 2018, the Nuclear Energy ...

    English WGFCS Fuel cycle facility safety Nuclear safety research CSNI Proceedings …
    Published date: 6 October 2020
    NEA Document
    Proceedings of International Workshop on Chemical Hazards in Fuel Cycle Facilities Nuclear Processing - Appendix C
    NEA/CSNI/R(2019)9/ADD1

    Appendix C

    The non-radiological risks involving dangerous chemicals in nuclear fuel cycle facilities,French framework regulation -

    Accidents involving hazardous chemicals pose a significant threat to...

    English Nuclear safety research CSNI Proceedings
    Published date: 12 June 2019
    NEA Document
    Improving Robustness Assessment Methodologies for Structures Impacted by MissileS – IRIS Phase 3
    NEA/CSNI/R(2023)5

    This report presents the description and the interpretation of the tests carried out in the third phase of the NEA Working Group on Integrity and Ageing of Components and Structures (WGIAGE) activity...

    WGIAGE Nuclear safety Nuclear safety research CSNI PRG CSNI Safety Safety of components and structures Safety research …
    Published date: 2 January 2025
    NEA Document
    Metallic Component Margins under High Seismic Loads (MECOS): Towards a New Approach for Seismic Design of Piping Systems
    NEA/CSNI/R(2021)12

    The seismic design rules for nuclear power plant piping systems that have been in practice since the 1960s have been applied to hundreds of piping supports and seismic restraints for nuclear power pl...

    WGIAGE Nuclear safety Nuclear safety research CSNI PRG CSNI Safety Safety research …
    Published date: 11 December 2024
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    • en English
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