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    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: 10 July 2025
    News
    Analysing reflood thermal-hydraulics: Joint project members discuss progress

    Members of the NEA's nuclear safety joint project Rod Bundle Heat Transfer – Phase 2 (RBHT-II) met at the laboratories of CEA (the French Alternative Energies and Atomic Energy Commission) in Saclay,...

    Fuel in nuclear safety News brief WGAMA Nuclear safety Thermal hydraulics Nuclear safety research Joint project …
    Published date: 4 July 2025
    News
    Progress in the ASNR COAL reflooding experiments

    The task group held its meeting on 26-27 June 2025 at the NEA headquarters in Paris.

    News brief WGAMA Joint project WGFS Accident management …
    Published date: 30 June 2025
    News
    Strengthening CFD use for nuclear reactor safety

    The CFD Working Group on Analysis and Management of Accidents (WGAMA) completed its 6th phase.

    News brief CFD WGAMA
    Published date: 25 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
    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
    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
    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
    NEA Document
    Status Report on Reliability of Thermal-Hydraulic Passive Systems
    NEA/CSNI/R(2021)2

    Passive thermal-hydraulic systems are widely used in nuclear reactor safety and design. For example, primary circuits in existing boiling and pressurised water reactors are designed to take advantage...

    English WGAMA WGRISK Nuclear safety Accident analysis and management Nuclear technology Nuclear safety research CSNI PRG CSNI Safety Risk assessment Thermal hydraulics Accident management …
    Published date: 26 November 2024
    NEA Document
    WGAMA PERSEO Benchmark Results Report
    NEA/CSNI/R(2021)2/ADD

    PERSEO was built at SIET laboratory (Piacenza, Italy) to study a new passive decay heat removal system operating in natural circulation. The main innovation in PERSEO is the presence of two pools con...

    English WGAMA Nuclear safety Accident analysis and management Italy Nuclear safety research CSNI PRG CSNI Safety Accident management Pressurised water reactors …
    Published date: 26 November 2024
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