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    Activity
    Working Group on Risk Assessment (WGRISK)

    The Working Group supports improved uses of Probabilistic Safety Assessment (PSA) in risk-informed regulation and safety management through the analysis of results and the development of perspectives...

    Risk assessment WGRISK Nuclear safety research CSNI Safety …
    Published date: 13 March 2024
    NEA Document
    NEA Leak Rate Benchmark Final Report
    NEA/CSNI/R(2022)9

    The objective of this study is to compare leak rate computation practices and the applied tools and software solutions. Leak rate prediction is an important aspect of the leak-beforebreak assessment,...

    English WGIAGE Nuclear safety research CSNI Safety of components and structures …
    Published date: 13 March 2024
    News
    NEA nuclear safety committees make progress on best practices in the safety assessment and regulation of nuclear facilities

    The NEA Committee on the Safety of Nuclear Installations (CSNI) and the Committee on Nuclear Regulatory Activities (CNRA) convened on 4-8 December to discuss current activities and plan future body o...

    News brief Nuclear safety Nuclear safety research CSNI Nuclear fuel cycle …
    Published date: 18 December 2023
    NEA Document
    International Severe Accident Management Conference (ISAMC)
    NEA/CSNI/R(2021)9

    This synthesis report summarises the technical programme and the outcome of the 2018 International Severe Accident Management Conference (ISAMC-2018) organised in Ottawa, Ontario on 15-18 October 201...

    Human aspects of nuclear safety WGHOF Human and organisational factors WGAMA Nuclear safety Nuclear safety research CSNI PRG CSNI International co-operation Canada CANDU reactors Nuclear safety regulation Accident management …
    Published date: 11 December 2023
    NEA Document
    Use of NEA Database Projects Operating Experience Data for Probabilistic Safety Assessment
    NEA/CSNI/R(2020)12

    As noted in the Joint CSNI/CNRA Strategic Plan and Mandates (NEA, 2019), the safe operation of current, new and advanced nuclear facilities is a key challenge for nuclear regulators and technical saf...

    WGRISK Nuclear safety Nuclear safety research CSNI PRG Databases CSNI Joint project Safety Risk Nuclear safety regulation …
    Published date: 11 December 2023
    Joint project
    Fire Incidents Records Exchange (FIRE) Project

    The Fire Incidents Records Exchange (FIRE) Project started in 2002 and phase 7 of the project began in 2023 for a duration of three years, with 14 countries currently participating. The main purpose ...

    Risk assessment Fuel cycle facility safety Nuclear safety research Databases CSNI Joint project Safety research …
    Published date: 23 November 2023
    Joint project
    RASPLAV Project

    RASPLAV-A-Salt Facility, EREC.

     

    The RASPLAV* Project was regarded as a successor to the Three Mile Island Vessel Investigation Project (TMI-VIP) completed in 1993. The TMI-VIP Project was set up t...

    Accident analysis and management Nuclear safety research CSNI Joint project
    Published date: 7 November 2023
    Joint project
    Source Term Evaluation and Mitigation (STEM) Project

                                                                                      EPICUR facility, IRSN.

     

    On this page

    • STEM phases
      • First phase (2011-2015)
      • Second phase (2016-2019)

    STEM phases

    First phase (2011-2015)

    The STEM Project was initiated with a first phase in 20...

    Accident analysis and management Nuclear safety research CSNI Safety Safety research …
    Published date: 27 October 2023
    Publications and Reports
    CSNI Technical Opinion Paper No. 21: Research Recommendations to Support the Safe Deployment of Small Modular Reactors

    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 needed to accelerate the ...

    English SMR EGSMR Nuclear safety Nuclear safety research CSNI Safety research …
    Published date: 10 October 2023
    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
    Other
    Application of the OECD Rasplav Project Results

    The OECD NEA RASPLAV Project provided experiments with prototypical material and data on the behavior of molten core material (corium) in the reactor pressure vessel lower head during a severe accide...

    Accident analysis and management Nuclear safety research CSNI Joint project
    Published date: 6 October 2023
    Publications and Reports
    CSNI Status Report and Perspectives: Advances in the Analysis and Management of Accidents and Future Challenges

    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 of accidents, ultim...

    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: 5 October 2023
    NEA Document
    Computational Fluid Dynamics for Nuclear Reactor Safety (CFD4NRS-8) Workshop, 25-27 November 2020
    NEA/CSNI/R(2022)2

    The eighth instalment of the workshop on computational fluid dynamics for nuclear reactor safety (CFD4NRS-8) was organised by the Nuclear Energy Agency (NEA) Committee on the Safety of Nuclear Instal...

    WGAMA Nuclear safety Nuclear safety research CSNI Safety Safety research CFD …
    Published date: 28 August 2023
    News
    Experts meet to discuss scientific and technical aspects in the field of nuclear installations safety

    Around 50 delegates from 22 countries and 2 international organisations gathered on 6-7 June 2023 for the 73rd CSNI meeting.

    News brief Nuclear safety Nuclear safety research CSNI Safety research …
    Published date: 14 June 2023
    NEA Document
    SAPIUM: Development of a Systematic Approach for Input Uncertainty Quantification of the Physical Models in Thermal-Hydraulic Codes: Good Practice Guidance
    NEA/CSNI/R(2020)16

    In the current project, a new systematic approach has been developed, called SAPIUM (systematic approach for input uncertainty quantification methodology) for transparent and rigorous model IUQ. This...

    English Nuclear installations WGAMA Nuclear safety Nuclear accident loss estimation CSNI PRG CSNI Joint project Safety Accident management …
    Published date: 30 May 2023
    NEA Document
    New Devices for Electrical Equipment Replacement/Retrofits and New Build
    NEA/CSNI/R(2021)3

    Recent operating experience in nuclear power plants has shown that there is a safety concern associated with the use of new industrial devices, including digital devices, in safety power systems in b...

    WGELEC Safety of electrical systems Nuclear safety research CSNI
    Published date: 15 May 2023
    NEA Document
    Behaviour of Iodine Project 3: Final Summary Report
    NEA/CSNI/R(2020)14

    The present report summarises the main results and learnings from the third phase of the NEA Behaviour of Iodine Project (BIP-3), which was conducted between 2016 and 2019 by the Canadian Nuclear Lab...

    Nuclear safety State-of-the-art report Nuclear safety research CSNI PRG CSNI Joint project Safety Safety research Nuclear safety regulation …
    Published date: 15 February 2023
    NEA Document
    Evaluation of Design and Monitoring Requirements for Vibrations in Safety-Related Fluid Systems
    NEA/CSNI/R(2020)2

    In order to reach a better understanding of countries’ different approaches to the evaluation of vibrations detected in piping systems and components, the NEA Committee on the Safety of Nuclear Insta...

    WGIAGE Nuclear safety Nuclear safety research CSNI PRG CSNI Safety …
    Published date: 15 February 2023
    NEA Document
    Advancing the Robustness of Electrical Power Systems of Nuclear Power Plants
    NEA/CSNI/R(2020)8

    The aim of this report is to examine whether there are any international variations in the electrical power system designs (“design variations”) of nuclear power plants that affect the system respons...

    Nuclear safety WGELEC Nuclear safety research CSNI PRG CSNI Safety Nuclear safety regulation …
    Published date: 13 January 2023
    News
    Progress in reactivity-initiated accident research

    Two new reports from the WGFS highlight the latest developments in RIA research.

    News brief Fuel studies Accident analysis and management Nuclear safety research CSNI WGFS Safety research …
    Published date: 30 November 2022
    Joint project
    Benchmark Study of the Accident at the Fukushima Daiichi Nuclear Power Station (BSAF) Project

    Units 1 and 2 End of Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Company Holdings (4th October, 2011). Photo: Tokyo Electric Power Company Holdings

    The Benchmark Study of the Acci...

    Accident analysis and management Thermal hydraulics Nuclear safety research CSNI Accident management …
    Published date: 25 November 2022
    NEA Document
    Phase III of the Assessment of Structures Subjected to Concrete Pathologies (ASCET): Final Report
    NEA/CSNI/R(2019)11

    In the ASCET Phase III, the goal was to assess and develop the Phase II (blind benchmark) recommendations using additional test results. The Phase III simulations were performed using a full set of t...

    English Structural materials WGIAGE Nuclear safety Nuclear safety research CSNI PRG Safety assessment CSNI Safety …
    Published date: 24 November 2022
    NEA Document
    Summary and Conclusions of the Joint PKL-ATLAS Workshop on Analytical Activities Related to the NEA PKL-4 and ATLAS-2 Projects
    NEA/CSNI/R(2020)13

    Since 2001, the NEA has supported the Senior Expert Group on Safety Research Thermal-hydraulics (SETH), the Primärkreislauf-Versuchsanlage - Primary Coolant Loop Test Facility (PKL), PKL-2 and PKL-3 ...

    Accident analysis and management Thermal hydraulics Nuclear safety research CSNI Accident management …
    Published date: 23 November 2022
    News
    Nuclear Fuel Cycle Facilities Safety Week at the NEA

    Nuclear Fuel Cycle Facilities Safety Week

    IAEA WGFCS CSNI Safety research
    Published date: 7 November 2022
    NEA Document
    Consensus Position on the Impact of Cyber Security Features on Digital Instrumentation and Control Systems Important to Safety at Nuclear Power Plants [CP-08]
    NEA/CNRA/R(2021)2

    The NEA Working Group on Digital Instrumentation and Controls (WGDIC) has agreed that a consensus position on the impact of cyber security features on digital instrumentation and control (I&C) system...

    IAEA CNRA Nuclear safety Digital instrumentation Security WGDIC CSNI Safety International co-operation …
    Published date: 7 November 2022
    NEA Document
    ICDE Topical Report: Collection and Analysis of Multi-Unit Common-Cause Failure Events
    NEA/CSNI/R(2019)6

    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 was multi-unit CCF events.

    T...

    Nuclear safety CSNI PRG CSNI Joint project Safety Safety research …
    Published date: 3 November 2022
    NEA Document
    ICDE Topical Report: Provision Against Common-cause Failures by Improving Testing
    NEA/CSNI/R(2019)5

    This report presents a study performed on a set of common-cause failure (CCF) events within the Nuclear Energy Agency (NEA) International Common-cause Failure Data Exchange (ICDE) Project. The topic ...

    Nuclear safety CSNI PRG CSNI Joint project Safety Safety research …
    Published date: 3 November 2022
    NEA Document
    Cold Leg Mixing Computational Fluid Dynamics – Uncertainty Quantification (CLM-UQ) Benchmark Results
    NEA/CSNI/R(2020)7

    The cold leg mixing computational fluid dynamics (CFD) – uncertainty quantification (CLM-UQ) benchmark is the fifth benchmark concerning CFD applications to nuclear reactor safety to be organised in ...

    WGAMA Nuclear safety Nuclear safety research CSNI
    Published date: 3 November 2022
    NEA Document
    Reactivity Initiated Accident Benchmark Phase III Report
    NEA/CSNI/R(2020)10

    Following the recommendations from the technical workshop on “Nuclear Fuel Behaviour during Reactivity-Initiated Accidents” organised by the Nuclear Energy Agency (NEA) in September 2009, a first ben...

    Fuel studies Nuclear safety Nuclear technology Nuclear security Nuclear safety research CSNI PRG CSNI Safety Uncertainty analysis Nuclear safety regulation WGFS …
    Published date: 18 October 2022
    NEA Document
    NEA CODAP Project Topical Report: A Review of the "Post-1998" Experience with Thermal Fatigue in Heavy Water and Light Water Reactor Piping Components
    NEA/CSNI/R(2019)13

    Since its inception in 2002, the operating experience with thermal fatigue mechanisms has been an intrinsic aspect of the technical scope of CODAP, which is a joint database project within the Commit...

    Nuclear safety Light water reactors Information, data and knowledge management CSNI PRG Databases CSNI Joint project Safety Technology Safety research …
    Published date: 11 October 2022
    NEA Document
    OECD/NEA X-FEM Benchmark Final Report
    NEA/CSNI/R(2020)11

    This report summarises the work done for the activity: “Benchmark analysis on the eXtended Finite Element Method (X-FEM) calculation technology in its use to evaluate the fracture mechanics stress in...

    WGIAGE Nuclear safety CSNI Safety Technology Safety research …
    Published date: 6 October 2022
    NEA Document
    Specialists Workshop on Advanced Instrumentation and Measurement Techniques for Experiments Related to Nuclear Reactor Thermal Hydraulics and Severe Accidents (SWINTH-2019)
    NEA/CSNI/R(2021)1

    The Specialists Workshop on Advanced Instrumentation and Measurement Techniques for Experiments Related to Nuclear Reactor Thermal Hydraulics and Severe Accidents (SWINTH-2019), co-organised by the S...

    WGAMA Accident analysis and management Nuclear safety research CSNI
    Published date: 5 October 2022
    News
    Prevention, mitigation and management of potential accidents in nuclear power plants

    Prevention, mitigation and management of potential accidents in nuclear power plants

    News brief CFD WGAMA Accident analysis and management CSNI Accident management …
    Published date: 5 October 2022
    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
    Event
    International Workshop on Process and Safety Improvements Experienced in Fuel Cycle Facilities since 2010
    3 - 4 October 2022
    OECD Nuclear Energy Agency, 46 Quai Alphonse le Gallo, 92100 Boulogne-Billancourt

    The Working Group on Fuel Cycle Safety (WGFCS) of the Nuclear Energy Agency (NEA) Committee on the Safety of Nuclear Installations (CSNI) held an international workshop on Process and Safety Improvem...

    WGFCS Fuel cycle facility safety Nuclear safety research CSNI
    Published date: 3 November 2022
    Other
    Effective Nuclear Regulation and Safety Management in a Pandemic
    Nuclear safety Regulation Nuclear safety research CSNI COVID-19 Nuclear safety regulation …
    Published date: 30 September 2022
    NEA Document
    Prestressed Concrete Reactor Containment Behaviour in Test Condition Taking into Account Ageing Effects (VeRCoRs)
    NEA/CSNI/R(2019)15

    The VeRCoRs facility mock-up is a reactor containment building at 1/3 scale. The mock-up is instrumented so that its behaviour is monitored from the beginning of construction. More than 700 sensors a...

    English WGIAGE Nuclear safety Nuclear safety research CSNI PRG CSNI Safety Safety research …
    Published date: 27 September 2022
    NEA Document
    ICDE Topical Report: Collection and Analysis of Intersystem Common-Cause Failure Events
    NEA/CSNI/R(2020)1

    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 intersystem...

    Nuclear safety Nuclear safety research CSNI
    Published date: 21 June 2022
    News
    Joint NEA-IAEA symposium on probabilistic safety assessment for singular design reactors

    The joint NEA-IAEA symposium hosted by the United Kingdom’s Office for Nuclear Regulation brought together experts to exchange on the use and application of Probabilistic Safety Analysis (PSA) for re...

    News brief IAEA WGRISK Safety assessment CSNI Probabilistic risk assessment Reactor design …
    Published date: 14 June 2022
    News
    Experts discuss nuclear safety and regulatory issues

    CSNI and CNRA held their biannual meetings and a joint session at the NEA headquarters.

    News brief Nuclear installations CNRA Nuclear safety Regulation Nuclear safety research CSNI Nuclear safety regulation …
    Published date: 10 June 2022
    Event
    Joint NEA and IAEA International Symposium on PSA for Reactors of Singular Designs
    7 - 9 June 2022
    Liverpool, United Kingdom

    The Symposium is free of charge for all participants and is scheduled to take place in person at the ONR’s offices near Liverpool in the United Kingdom. 

     

    Key Dates

    31 March 2022  Deadline for a...
    SMR IAEA WGRISK Nuclear safety CSNI Safety Reactor design …
    Published date: 6 April 2022
    News
    Probabilistic safety assessment for singular design reactors

    Joint NEA and IAEA event will explore probabilistic safety assessment for reactors of singular designs

    News brief IAEA WGRISK Safety assessment CSNI Probabilistic risk assessment Reactor design …
    Published date: 28 April 2022
    Event
    Workshop on uncertainties in the assessment of natural hazards (excluding earthquakes)
    19 - 21 April 2022
    Zoom - REGISTRATION CLOSED

    To meet the overall safety objectives and to achieve a balanced plant design, natural hazards have to be considered in the design of nuclear installations. Deriving the strength of such events from a...

    Risk assessment WGEV External hazards and nuclear safety Nuclear safety research CSNI …
    Published date: 15 April 2022
    NEA Document
    Proceedings of the Workshop on Source Term: A Report by the Committee on the Safety of Nuclear Installations Working Group on the Analysis and Management of Accidents
    NEA/CSNI/R(2020)4

    The investigation conducted in the last 15 years on different aspects of Source Term worldwide, and particularly in the context of the Nuclear Energy Agency (NEA) in the form of projects and the Work...

    English WGAMA Accident analysis and management Nuclear safety research CSNI …
    Published date: 14 April 2022
    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
    Publications and Reports
    Harmonising the Nuclear Licensing Process for Emerging Technologies: A Global Path Forward

    Independent safety regulation has been a hallmark of the global nuclear power sector from its beginnings. Industry and government have long understood the importance of a predictable and adaptable re...

    English Nuclear safety Regulation Policy Brief Nuclear safety research CSNI Regulation of new and advanced reactors SMR Small modular reactors Advanced reactor systems CNRA Nuclear innovation Nuclear safety regulation …
    Published date: 7 April 2022
    Event
    Workshop on High Winds and Tornadoes Hazard Assessment and Protection of Nuclear Installations
    22 - 25 March 2022
    Videoconference, Zoom

    After the Fukushima nuclear accident, many activities were initiated in the countries with nuclear energy to assess the robustness of nuclear power plants with respect to earthquakes, tsunamis and fl...

    External hazards WGEV External hazards and nuclear safety Nuclear safety research CSNI …
    Published date: 29 March 2022
    NEA Document
    Summary Report of the NEA ATLAS-2 Joint Project
    NEA/CSNI/R(2021)6

    Within the context of the Nuclear Energy Agency (NEA) Advanced Thermal-hydraulic Test Loop for Accident Simulation (ATLAS) project, a series of tests were performed to resolve key thermal-hydraulic s...

    Nuclear safety Thermal hydraulics CSNI Joint project Safety Safety research …
    Published date: 18 February 2022
    NEA Document
    Requirements for CFD-Grade Experiments for Nuclear Reactor Thermal Hydraulics
    NEA/CSNI/R(2020)3

    When looking for a validation experiment for CFD application to reactor simulation for either design or safety studies, it appears that available data often suffer from a lack of local measurements, ...

    CFD WGAMA Nuclear safety Safety assessment CSNI Safety Accident management Reactor design …
    Published date: 17 February 2022
    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
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