NEA/CSNI/R(2021)11
At the Nuclear Energy Agency (NEA), the importance of fuel modelling and its improvement through development of phenomenological representations has been recognised and multiple technical groups rela...
Published date:
22 October 2024
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...
Published date:
11 October 2024
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...
Published date:
11 October 2024
This report established by the NEA Working Group on Fuel Safety (WGFS) of the Committee on the Safety of Nuclear Installations (CSNI) compiles the state-of-the-art knowledge on fuel behaviour in loss...
Published date:
18 September 2024
The objective of the Working Group on Fuel Cycle Safety (WGFCS) is to advance the understanding of relevant aspects of nuclear fuel cycle safety, including: uranium mining and milling; uranium refini...
Published date:
13 August 2024
Panda facility under construction. Photo courtesy of the Paul Scherrer Institute
HYMERES phases
First phase (2013-2016)
The main objective of the first phase of the Hydrogen Mitigation Experiments fo...
Published date:
12 August 2024
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...
Published date:
6 August 2024
NEA/CSNI/R(2023)4
Rising international interest in increasing fuel burnup limits and fuel cycle length may require fuel enrichment above 5% and high reactivity/high suppression core designs. Based on this interest in ...
Published date:
31 July 2024
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...
Published date:
19 July 2024
NEA/CSNI/R(2021)13
Participants from 14 organisations, representing 11 countries, performed the benchmark exercise. Each participant provided a high-level summary of the leak-before-break (LBB) requirements in their co...
Published date:
20 June 2024
NEA/CNRA/R(2021)1
This report analyses 36 events that regulators have observed during the construction of new nuclear power reactors, from siting to licensing and oversight. The database is part of the Contruction Exp...
Published date:
17 June 2024
NEA/CSNI/R(2022)7
The tsunami that followed the Great East Japan earthquake on 11 March 2011 led to beyond design-basis accidents at Units 1, 2 and 3 of the Fukushima Daiichi Nuclear Power Plant even though they had b...
Published date:
11 June 2024
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...
Published date:
11 June 2024
NEA/CSNI/R(2022)6
In continuation of the NEA-guided experimental programmes at the PKL test facility in Germany operated by Framatome GmbH, the fourth phase of the NEA PKL project was conducted between June 2016 and S...
Published date:
11 June 2024
NEA/CSNI/R(2020)6
This report aims to establish the status of current 3D capabilities in T/H system codes, covering all aspects and limitations, including the equations and simplifications considered, the time and spa...
Published date:
28 May 2024
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...
Published date:
21 May 2024
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...
Published date:
13 March 2024
Read the summary and main outcomes of the NEA Nuclear Safety Research Joint Projects Week.
Published date:
13 March 2024
Most safety incidents are often not due to a technical fault or the actions of a single individual, but rather originate in a compromised safety culture – the collection of the beliefs, perceptions a...
Published date:
12 March 2024
This report presents practical guidance to enhance leadership for safety in nuclear regulatory bodies. It identifies the effective characteristics, competencies and behaviours of leaders in regulator...
Published date:
12 March 2024
In the framework of the WGAMA/WGFS activity "Status Report on Good Practices for Analyses of Design Extension Condition without Significant Fuel Degradation (DEC-A) for Operating Nuclear Power Plants...
Published date:
20 December 2023
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...
Published date:
11 December 2023
EPICUR facility, IRSN.
STEM phases
First phase (2011-2015)
The STEM Project was initiated with a first phase in 20...
Published date:
27 October 2023
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 ...
Published date:
10 October 2023
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...
Published date:
5 October 2023
1 -
6 October 2023
Sendai International Center, Miyagi, Japan
The 12th International Conference on Nuclear Criticality Safety (ICNC) was held in Sendai, Japan, on 1-6 October 2023. Twenty years after the last conference in Japan, which was held in Tokai-mura as...
Published date:
31 July 2024
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...
Published date:
28 August 2023
NEA/CNRA/R(2020)3
The main objectives of the Special International Nuclear Regulatory Inspection Workshop on Digital Instrumentation & Control (DI&C), which was jointly held by the Nuclear Energy Agency’s (NEA) Workin...
Published date:
25 August 2023
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...
Published date:
30 May 2023
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...
Published date:
6 April 2023
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...
Published date:
15 February 2023
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...
Published date:
15 February 2023
The NEA event reviews the accomplishments of the joint safety projects.
Published date:
27 January 2023
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...
Published date:
13 January 2023
Published date:
7 December 2022
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...
Published date:
25 November 2022
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...
Published date:
24 November 2022
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7 November 2022
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3 November 2022
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3 November 2022
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...
Published date:
18 October 2022
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...
Published date:
11 October 2022
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...
Published date:
6 October 2022
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...
Published date:
27 September 2022
The main mission of the Working Group on Integrity and Ageing of Components and Structures (WGIAGE) is to advance the current understanding of the relevant aspects related with ensuring the integrity...
Published date:
10 August 2022
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... |
Published date:
6 April 2022
30 May 2022 -
3 June 2022
Published date:
15 March 2022
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...
Published date:
18 February 2022
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, ...
Published date:
17 February 2022
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...
Published date:
10 February 2022