scholarly journals Statistical analysis on the fluence factor of surveillance test data of Korean nuclear power plants

2017 ◽  
Vol 49 (4) ◽  
pp. 760-768
Author(s):  
Gyeong-Geun Lee ◽  
Min-Chul Kim ◽  
Ji-Hyun Yoon ◽  
Bong-Sang Lee ◽  
Sangyeob Lim ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Test Data ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants

scholarly journals INCEFA-PLUS (Increasing Safety in Nuclear Power Plants by Covering Gaps in Environmental Fatigue Assessment)

2017 ◽  
Author(s):  
Kevin Mottershead ◽  
Matthias Bruchhausen ◽  
Thomas Métais ◽  
Sergio Cicero ◽  
David Tice
Keyword(s):  
Test Data ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Phase 1 ◽  
Hold Time ◽  
Austenitic Stainless Steels ◽  
Common Interest ◽  
Mean Stress ◽  
Surface Finishes

INCEFA-PLUS is a five year project supported by the European Commission HORIZON2020 program. The project commenced in mid-2015. 16 organizations from across Europe have combined forces to deliver new experimental data which will support the development of improved guidelines for assessment of environmental fatigue damage to ensure safe operation of nuclear power plants. Within INCEFA-PLUS, the effects of mean strain, hold time, strain amplitude and surface finish on fatigue endurance of austenitic stainless steels in light water reactor environments are being studied experimentally, these being issues of common interest to all participants. The data obtained are being collected and standardized in an online environmental fatigue database, implemented with the assistance of a CEN workshop led by members of the INCEFA-PLUS project. Later in the project it is planned that INCEFA-PLUS will develop and disseminate methods for including the new data into assessment approaches for environmental fatigue degradation. This paper provides an update to the project introduction presented at PVP2016 (PVP2016-63149). In particular the paper presents the finalized matrix of test conditions for Phase 1 testing planned for 2017, including the agreed positions on testing for the effects of mean stress/strain and hold time. The materials being tested are summarized, together with available material characterization data. The specimen surface finishes used in the phase 1 testing are described, including measures taken to ensure uniformity of surface conditions throughout the consortium and characterization results for the two chosen surface finishes for each specimen geometry and material. The emerging plans for Phase 2 testing is also described, with a focus on steps being taken to enable more plant-relevant testing for the effects of mean stress and exploration of sensitivities to hold times within plant transients. The latest view on how the project results will be used to advance development of improved assessment guidelines is also discussed. An update is provided on the discussions at the CEN workshop on Standards-Compliant Formats for Fatigue Test Data (FATEDA) including progress towards agreeing test data formats and trials of XML data transfers from laboratory to database. Finally, a summary is provided of project dissemination activities.

scholarly journals Operating Experience for Valves at the Nuclear Power Plants of Ukraine and the European Union

2019 ◽  
pp. 35-43
Author(s):  
Roman Serafyn ◽  
Oleksiy Ligotskyy ◽  
Svitlana Nedbay ◽  
Oleksandr Pecherytsia ◽  
Roman Khalenko ◽  
...  
Keyword(s):  
European Union ◽  
Comparative Analysis ◽  
Statistical Analysis ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Operating Experience ◽  
The European Union ◽  
Statistical Assessment ◽  
Support Organizations

The paper presents information on the results of analyzing operational events at nuclear power plants (NPP) of Ukraine and the European Union that were caused or related to the failures of valves. The first part of the paper provides a brief overview of the European Clearinghouse on Operational Feedback for Nuclear Power Plants study on operational events with failure of the valves important to NPP safety. The abovementioned study considered events for the period from 1997 to 2016, which were taken from the IAEA database, databases of technical support organizations of France and Germany, as well as those provided by the Swiss and Spanish regulatory authorities. The main results of the study were presented in the paper, and the main causes of operational events caused by valve failures were observed. In addition, technical areas that required the development of recommendations were indicated. The paper includes a statistical assessment and a detailed analysis of the root causes of operational events at Ukrainian NPPs caused by or related to the failure of valves of all types, regardless of the effect on safety, for the period from 1998 to 2018. The approach for the analysis of operational events at Ukrainian NPPs is similar to that used in the above-mentioned study. Within the framework of the statistical analysis, the distribution of operational events at Ukrainian NPPs related to the failure of valves by years, nuclear power plants and systems was presented. The results of the analysis of the root causes of valve failures was presented within three groups referring to equipment, documentation, personnel and management system. In the final part of the paper, a comparative analysis of the contribution of the root causes obtained from the results of both studies was carried out, and the general lessons and specific recommendations for further consideration during the oversight activity are presented.

Work structure in nuclear power plants

1983 ◽  
Author(s):  
Marjorie B. Bauman ◽  
Richard F. Pain ◽  
Harold P. Van Cott ◽  
Margery K. Davidson
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Work Structure

Life Extension of Nuclear Power Plants: World Situation and the USA Case

2010 ◽  
pp. 50-56 ◽  
Author(s):  
Pablo T. León ◽  
Loreto Cuesta ◽  
Eduardo Serra ◽  
Luis Yagüe
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Life Extension ◽  
The Usa
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