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    NEA Document
    Level 2 PSA Methodology and Severe Accident Management
    NEA/CSNI/R(1997)11
    English WGRISK CSNI
    Published date: 26 January 2022
    NEA Document
    Evaluation of Uncertainties in Relation to Severe Accidents and Level-2 Probabilistic Safety Analysis: Workshop Proceedings
    NEA/CSNI/R(2007)2

    Uncertainty in relation to several severe accident phenomena plays a major role in probabilistic safety analyses involving beyond-design-basis accident scenarios for nuclear power plants. The technic...

    English Risk assessment WGRISK Accident analysis and management Uncertainty quantification Nuclear safety research Uncertainty analysis CSNI …
    Published date: 26 January 2022
    NEA Document
    Workshop on Experimental Validation and Application of CFD and CMFD Codes to Nuclear Reactor Safety Issues, CFD4NRS-7
    NEA/CSNI/R(2020)5

    The Workshop on Experimental Validation and Application of CFD and CMFD Codes to Nuclear Reactor Safety Issues, CFD4NRS-7 was the seventh in a series of workshops focusing on Computational Fluid Dyna...

    English CFD WGAMA Nuclear safety Accident analysis and management CSNI …
    Published date: 19 January 2022
    NEA Document
    Proceedings of the CSNI Workshop on Structural Reliability Evaluation and Mechanical Probabilistic Approaches of NPP Components
    NEA/CSNI/R(2007)18

    The Committee on the Safety of Nuclear Installations (CSNI) Workshop on Structural Reliability Evaluation and Mechanical Probabilistic Approaches of NPP Components was held in Lyon, France on 25-27 S...

    English WGIAGE Nuclear safety research CSNI Benchmark Proceedings Probabilistic risk assessment …
    Published date: 20 December 2021
    NEA Document
    CSNI Collective Statement on the Support Facilities for Existing and Advanced Reactors: The Function of OECD/NEA Joint Projects
    NEA/CSNI/R(2008)5

    In 2007, the NEA Committee on the Safety of Nuclear Installations (CSNI) issued a report titled Nuclear Safety Research in OECD Countries: Support Facilities for Existing and Advanced Reactors (SFEAR...

    English French Bilingual Nuclear safety research CSNI Joint project …
    Published date: 20 December 2021
    News
    Key NEA committees meet to discuss developments in nuclear safety research and regulation

    The NEA Committee on Nuclear Regulatory Activities (CNRA) and the Committee on the Safety of Nuclear Installations (CSNI) held their biannual meetings from 6 to 9 December 2021 and discussed the evol...

    News brief CNRA Nuclear safety Regulation Nuclear safety research CSNI Nuclear safety regulation …
    Published date: 14 December 2021
    NEA Document
    Assessment of the Safe Shutdown Earthquake Robustness Against On-site Observations
    NEA/CSNI/R(2019)14

    This activity of the Nuclear Energy Agency (NEA) Committee on the Safety of Nuclear Installations (CSNI) Working Group on Integrity and Ageing of Components and Structures (WGIAGE) is entitled “Asses...

    Nuclear installations Sustainable development WGIAGE Nuclear safety CSNI Safety Safety research …
    Published date: 25 November 2021
    NEA Document
    Operating Plan and Guidelines for the Nuclear Energy Agency Committee on the Safety of Nuclear Installations 2017-2022
    NEA/CSNI/R(2017)17/REV1
    Nuclear installations Nuclear safety CSNI
    Published date: 10 August 2021
    News
    Latest updates on NEA work in nuclear safety and regulation

    CNRA/CSNI meetings, May-June 2021.

    News brief CNRA Nuclear safety Regulation Nuclear safety research CSNI Nuclear safety regulation …
    Published date: 10 June 2021
    Event
    NEA Kappa Workshop: Earthquake Ground Motions on Rock Sites
    25 - 28 May 2021
    Videoconference, Zoom

    In the aftermath of the Fukushima accident, the nuclear community has been re-evaluating seismic hazard at nuclear facilities worldwide. One of the major challenges in this effort is quantifying and ...

    WGIAGE Nuclear safety External hazards Nuclear safety research CSNI Safety research …
    Published date: 1 December 2021
    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
    Status of Site-Level (Including Multi-Unit) Probabilistic Safety Assessment Developments
    NEA/CSNI/R(2019)16

    Two important lessons learnt from the March 2011 Fukushima Daiichi nuclear power plant (NPP) accident were: 1) there can be significant interactions between multiple co-located radiological sources (...

    English Fukushima WGRISK Nuclear safety Nuclear safety research CSNI Probabilistic risk assessment …
    Published date: 19 April 2021
    Activity
    Working Group on Electrical Power Systems (WGELEC)

    The main mission of the Working Group on the Safety of Electrical Systems (WGELEC) is to advance the current understanding and address safety issues related to electrical systems of nuclear installat...

    WGELEC Safety of electrical systems Nuclear safety research CSNI Safety …
    Published date: 16 February 2021
    Activity
    Senior Expert Group on Safety Research Opportunities Post-Fukushima (SAREF)

    The Senior Expert Group on Safety Research Opportunities Post-Fukushima (SAREF) was established at the June 2013 CSNI meeting to identify research activities to address safety research knowledge gaps...

    Fukushima Fuel cycle facility safety Nuclear safety research CSNI Safety Safety of components and structures …
    Published date: 4 February 2021
    News
    Nuclear safety research and regulation

    CNRA/CSNI meetings, December 2020

    News brief CNRA Nuclear safety Regulation Nuclear safety research CSNI Nuclear safety regulation …
    Published date: 7 December 2020
    News
    Computational fluid dynamics for nuclear reactor safety

    The NEA Working Group on Analysis and Management of Accidents (WGAMA) held the eighth Computational Fluid Dynamics (CFD) for Nuclear Reactor Safety Applications (CFD4NRS-8) workshop virtually on 25-2...

    News brief WGAMA Nuclear safety Accident analysis and management Nuclear safety research CSNI …
    Published date: 30 November 2020
    NEA Document
    Use and Development of Probabilistic Safety Assessments at Nuclear Facilities
    NEA/CSNI/R(2019)10

    This report provides descriptions of the current status of PSA programmes in member countries; including basic background information, guidelines, various PSA applications, major results in recent st...

    Fukushima WGRISK Nuclear safety Nuclear safety research CSNI Probabilistic risk assessment …
    Published date: 3 November 2020
    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
    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
    NEA Document
    ICDE Topical Report: Collection and Analysis of Common-Cause Failures due to Plant Modifications
    NEA/CSNI/R(2019)4

    The objective of the present report is to document a study that was performed on a set of common-cause failure (CCF) events. These events were derived from the International Common-cause Failure Data...

    English Nuclear safety research CSNI
    Published date: 21 August 2020
    News
    Safety of nuclear installations

    NEA Committee on the Safety of Nuclear Installations (CSNI) meeting, 4‑5 June 2020.

    News brief Nuclear safety research CSNI
    Published date: 1 July 2020
    News
    CSNI Programme Review Group holds its first virtual meeting

    CSNI Programme Review Group (PRG) annual review meeting, 27‑28 April 2020.

    News brief Nuclear safety research CSNI PRG CSNI
    Published date: 5 May 2020
    Activity
    Working Group on Fuel Safety Margins (WGFSM)

    This working group's objective was to advance the current understanding and to address safety issues related to fuel safety margins, in particular to systematically assess the technical basis for cur...

    Fuel in nuclear safety Nuclear fuel WGFCS Fuel cycle facility safety Nuclear safety research CSNI Safety WGFS …
    Published date: 29 April 2020
    Activity
    Task Group on Advanced Reactor Experimental Facilities (TAREF)

    A Task Group on Advanced Reactor Experimental Facilities (TAREF) had been set up to provide an overview of facilities suitable for carrying out safety research on gas-cooled and sodium fast reactors....

    Fuel cycle facility safety Nuclear safety research CSNI Safety Safety of components and structures …
    Published date: 28 April 2020
    Activity
    Task Group on Sump Clogging

    The Task Group on Sump Clogging had been set up to update the State-of-the-art Report (SOAR) on Knowledge Base for Emergency Core Cooling System Recirculation Reliability issued in 1996, and with foc...

    Nuclear safety research CSNI Safety Safety of components and structures
    Published date: 28 April 2020
    Activity
    CSNI Action Plan in the Area of Safety Margins

    The CSNI Action Plan in the Area of Safety Margins was set up by the Committee on the Safety of Nuclear Installations (CSNI),

    Fuel cycle facility safety Nuclear safety research CSNI Safety Safety of components and structures Operating experience Nuclear safety regulation …
    Published date: 27 April 2020
    Activity
    Task Group on Safety Margin Applications and Assessment (SM2A)

    This task group was set up to carry out a pilot project using the methodology propsed in the final SMAP report published in 2007. In this pilot project, the SMAP methodology was applied to the Zion n...

    Accident analysis and management Nuclear safety research CSNI Safety Safety of components and structures …
    Published date: 27 April 2020
    Activity
    Senior Expert Group on Safety Research / Support Facilities for Existing and Advanced Reactors 2 (SESAR/SFEAR2)

    The Senior Expert Group on Safety Research / Support Facilities for Existing and Advanced Reactors 2 (SESAR/SFEAR2) is responsible for reviewing and updating the previous SESAR assessments of researc...

    Fuel cycle facility safety Nuclear safety research CSNI Safety Safety of components and structures Safety research …
    Published date: 22 April 2020
    Activity
    Task Group on Robustness of Electrical Systems of NPPs (ROBELSYS)

    A Task Group on the Robustness of Electrical Systems of NPPs in Light of the Fukushima Daiichi Accident (ROBELSYS) had been set up to improve the understanding of nuclear power plant electrical syste...

    Electrical systems Safety of electrical systems Nuclear safety research CSNI Safety Safety of components and structures …
    Published date: 22 April 2020
    Activity
    CSNI Task Group on Defence in Depth of Electrical Systems and Grid Interaction (DIDELSYS)

    The NEA Committee on the Safety of Nuclear Installations (CSNI) established a task group to examine Defence in Depth of Electrical Systems and Grid Interaction (DIDELSYS). The DIDELSYS Project, carri...

    Electrical systems Safety of electrical systems Nuclear safety research CSNI Safety Safety of components and structures …
    Published date: 17 April 2020
    NEA Document
    Improving Evaluations of Source Terms for Severe Accidents at Nuclear Installations: Final Report of the Source Term Evaluation and Mitigation Project (STEM)
    NEA/CSNI/R(2018)6

    The Source Term Evaluation and Mitigation Project (STEM) project, hosted by the Nuclear Energy Agency (NEA) and operated by the Institut de Radioprotection et de Sûreté Nucléaire (French Institute of...

    English CSNI
    Published date: 17 March 2020
    News
    Safety of nuclear installations

    NEA Committee on the Safety of Nuclear Installations (CSNI) meeting, 4‑5 December 2019.

    News brief Nuclear safety research CSNI
    Published date: 6 December 2019
    News
    Joint NEA-IAEA meeting on electrical power systems

    Joint NEA-IAEA meeting on electrical power systems, 2‑5 December 2019

    News brief Nuclear safety WGELEC Safety of electrical systems Nuclear safety research CSNI …
    Published date: 5 December 2019
    NEA Document
    Nuclear Power Plant Components and Structures under Severe Accident Loading (COSSAL): Final Report (Appendices)
    NEA/CSNI/R(2019)2/ADD1

    This is a companion document to the final report of the COSSAL project. It includes appendices which address participant responses to a questionnaire, the data of the problem statement on the large-s...

    English WGIAGE Nuclear safety research CSNI
    Published date: 16 August 2019
    NEA Document
    Nuclear Power Plant Components and Structures under Severe Accident Loading (COSSAL)
    NEA/CSNI/R(2019)2

    In the face of severe accident scenarios with melted core material, such as those that occurred at Three Mile Island-2 in 1979 and at Fukushima Daiichi in 2011, the integrity assessment of primary ci...

    English WGIAGE Nuclear safety research CSNI
    Published date: 16 August 2019
    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
    Comparison of Probabilistic Seismic Hazard Analysis of Nuclear Power Plants in Areas with Different Levels of Seismic Activity
    NEA/CSNI/R(2019)1
    Seismic hazards remain an important factor that nuclear power plant designers and operators worldwide must take into account. Therefore, the Working Group on the Integrity and Ageing of Components a...
    English WGIAGE Nuclear safety research CSNI
    Published date: 3 June 2019
    Publications and Reports
    CSNI Technical Opinion Paper No. 17

    CSNI Technical Opinion Paper No. 17: Fire Probabilistic Safety Assessments for Nuclear Power Plants: 2019 Update provides an authoritative review of the current status and use of the fire PSA in nucl...

    English Nuclear safety research CSNI Nuclear safety regulation Technical Opinion Papers …
    Published date: 27 May 2019
    NEA Document
    Computational Fluid Dynamics for Nuclear Reactor Safety Applications-6 (CFD4NRS-6): Workshop Proceedings
    NEA/CSNI/R(2017)20

    The present report summarises the 6th workshop on Computational Fluid Dynamics for Nuclear Reactor Safety Applications (CFD4NRS-6) in the biennial series, supported by the Nuclear Energy Agency Worki...

    English WGAMA Nuclear safety research CSNI Proceedings …
    Published date: 6 May 2019
    NEA Document
    NEA CODAP Project Topical Report on Basic Principles of Collecting and Evaluating Operating Experience Data on Metallic Passive Components
    NEA/CSNI/R(2018)12

    Several NEA member countries have agreed to establish the Component Operational Experience, Degradation and Ageing Programme (CODAP) to encourage multilateral co-operation in the collection and analy...

    English Nuclear safety research CSNI
    Published date: 4 April 2019
    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
    NEA Document
    Comparison of Methodologies for the Simulation of Electrical Systems in Nuclear Power Plants: Working Group on Electrical Power Systems Activity 3 Report
    NEA/CSNI/R(2018)10

    One of the major conclusions of this workshop was that simulation of electrical systems has not been adequately discussed at the international level despite the fact that it is used more and more fre...

    English WGELEC Nuclear safety research CSNI
    Published date: 19 February 2019
    NEA Document
    NEA Benchmark Exercise: Computational Fluid Dynamic Prediction and Uncertainty Quantification of a GEMIX Mixing Layer Test
    NEA/CSNI/R(2017)19
    The main objectives of the current activity are the promotion, test and evaluation of various methodologies for uncertainty quantification in computational fluid dynamics (UQCFD) for nuclear reactor...
    English Uncertainty quantification Nuclear safety research CSNI
    Published date: 6 February 2019
    NEA Document
    Phase II of the Assessment of Structures Subjected to Concrete Pathologies (ASCET): Final Report
    NEA/CSNI/R(2018)4

    The objective of the CSNI ASCET activity is to make general recommendations for ageing management of concrete nuclear facilities taking into account the effect of concrete pathologies on structural d...

    English WGIAGE Nuclear safety research CSNI
    Published date: 21 January 2019
    NEA Document
    ICDE Project Report: Summary Phase VII of the International Common-cause Exchange Project of Nuclear Power Plant Events
    NEA/CSNI/R(2019)3

    The ICDE project allows multiple countries to collaborate and exchange CCF data to enhance the quality of risk analyses, which include CCF modelling. Because CCF events are typically rare, most count...

    English Accident analysis and management Safety of electrical systems Nuclear safety research Ancillary data CSNI Joint project Safety Safety of components and structures Safety research Risk assessment …
    Published date: 21 January 2019
    NEA Document
    NEA Component Operational Experience, Degradation & Ageing Programme (CODAP): Second Term (2015-2017) Status Report
    NEA/CSNI/R(2019)7
    Several Nuclear Energy Agency (NEA) member countries have agreed to establish the Component Operational Experience, Degradation and Ageing Programme (CODAP) to encourage multilateral co-operation in...
    English Nuclear safety research CSNI
    Published date: 21 January 2019
    NEA Document
    Phase II of the Assessment of Structures Subjected to Concrete Pathologies (ASCET): Final Report (Appendix)
    NEA/CSNI/R(2018)4/ADD1

    Increasingly engineers are confronted with the need to perform predictive structural assessment based on limited or incomplete data set. This may include damage up to failure assessment (in the conte...

    English WGIAGE Nuclear safety research CSNI
    Published date: 1 January 2019
    NEA Document
    Status of Practice for Level 3 Probabilistic Safety Assessments
    NEA/CSNI/R(2018)1

    The mission of the Nuclear Energy Agency (NEA) Committee on the Safety of Nuclear Installations (CSNI) Working Group on Risk Assessment (WGRISK) is to advance understanding of probabilistic safety as...

    English WGRISK Nuclear safety research CSNI
    Published date: 19 December 2018
    NEA Document
    Cable Ageing in Nuclear Power Plants: Report on the First and Second Terms (2012-2017) of the NEA Cable Ageing Data and Knowledge (CADAK) Project
    NEA/CSNI/R(2018)8

    The number of ageing nuclear power plants (NPPs) is increasing in NEA member countries. Accordingly, maintenance programmes, in-service inspection and testing of structures, systems and components im...

    English Nuclear safety research CSNI Safety of components and structures
    Published date: 6 December 2018
    NEA Document
    Resolving Complex Safety Relevant Issues Related to Hydrogen Release in Nuclear Power Plant Containments During a Postulated Severe Accident
    NEA/CSNI/R(2018)11

    This is a summary report by the Hydrogen Mitigation Experiments for Reactor Safety (HYMERES) project on the PANDA and MISTRA experiments.

    Phase 1 of the Project, between 2013 and 2016, focused on imp...

    English Nuclear safety research CSNI Joint project
    Published date: 23 November 2018
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