Role and demonstration of structural integrity of LMFBR structures within the frame of the safety assessment process

1993 ◽  
Vol 144 (3) ◽  
pp. 399-408
Author(s):  
H. Laue ◽  
F. Morgenstern ◽  
F. Rohdenburg ◽  
B. Hosemann
Keyword(s):  
Safety Assessment ◽  
Structural Integrity ◽  
Assessment Process

Composition of Safety and Cyber Security Analysis Techniques and Tools for NPP I&C System Assessment

2020 ◽  
pp. 204-220
Author(s):  
Ievgen Babeshko ◽  
Kostiantyn Leontiiev
Keyword(s):  
Cyber Security ◽  
Nuclear Power ◽  
Safety Assessment ◽  
Security Analysis ◽  
Assessment Method ◽  
Assessment Methods ◽  
Assessment Process ◽  
Safety Level ◽  
Methods And Techniques ◽  
And Control

Safety assessment of nuclear power plant instrumentation and control systems (NPP I&Cs) is a complicated and resource-consuming process that is required to be done so as to ensure the required safety level and comply to normative regulations. A lot of work has been performed in the field of application of different assessment methods and techniques, modifying them, and using their combinations so as to provide a unified approach in comprehensive safety assessment. Performed research has shown that there are still challenges to overcome, including rationale and choice of the safety assessment method, verification of assessment results, choosing and applying techniques that support safety assessment process, especially in the nuclear field. This chapter presents a developed framework that aggregates the most appropriate safety assessment methods typically used for NPP I&Cs.

Safety Assessment Process Optimization for Integrated Modular Avionics

2019 ◽  
Vol 34 (11) ◽  
pp. 58-67 ◽  
Author(s):  
Yunsheng Wang ◽  
Hang Lei ◽  
Richard Hackett ◽  
Martin Beeby
Keyword(s):  
Process Optimization ◽  
Safety Assessment ◽  
Assessment Process ◽  
Integrated Modular Avionics

scholarly journals Structural Monitoring and Safety Assessment during Translocation of Mahavira Hall of Jade Buddha Temple

2019 ◽  
Vol 11 (19) ◽  
pp. 5477 ◽  
Author(s):  
Zhang ◽  
Xue ◽  
Xie ◽  
Zhang ◽  
Lu
Keyword(s):  
Safety Assessment ◽  
Structural Integrity ◽  
Relative Displacement ◽  
Value Theory ◽  
Timber Structure ◽  
Structural Monitoring ◽  
Structural Performance ◽  
Threshold Values ◽  
Limit Value ◽  
The Ancient Chinese

The Mahavira Hall of the Jade Buddha Temple in Shanghai, China is a century-old traditional timber structure with a post-and-lintel construction. To improve the temple’s architectural layout and enhance the lintel structural integrity, the Mahavira Hall was moved 30.66 m and then elevated 1.05 m in September 2017. To assist in the structural translocation and uplift, the authors designed a monitoring system to continuously measure the relative displacement and inclination of the overall structure, individual components, and inside statues to ensure the integrity of the hall and its contents. This article presents and summarizes the priority issues and principles of monitoring the ancient Chinese timber structure. The time series of monitored data are decimated in order to minimize the fluctuation of data. The structural integrity of the Mahavira Hall was evaluated based on the inclination angle of its vital members. Finally, combined with the limit value regulated by code and the predicted early warning threshold values, which are based on extreme value theory, the effect of the translocation on the structural performance was obtained using fuzzy logic.

scholarly journals The Safety Assessment Process—Setting the Scene: An FDA Perspective

ILAR Journal ◽  
2002 ◽  
Vol 43 (Suppl_1) ◽  
pp. S5-S10 ◽  
Author(s):  
Leonard M. Schechtman
Keyword(s):  
Safety Assessment ◽  
Assessment Process

An Oil Field Structural Integrity Assessment for Re-Qualification and Life Extension

2013 ◽  
Author(s):  
Abe Nezamian ◽  
Joshua Altmann
Keyword(s):  
Weight Control ◽  
Structural Integrity ◽  
Offshore Structures ◽  
Oil Field ◽  
Assessment Process ◽  
Performance Criteria ◽  
Life Extension ◽  
Original Design ◽  
Integrity Assessment ◽  
Design Life

The ageing of offshore infrastructure presents a constant and growing challenge for operators. Ageing is characterised by deterioration, change in operational conditions or accidental damages which, in the severe operational environment offshore, can be significant with serious consequences for installation integrity if not managed adequately and efficiently. An oil field consisting of twelve well head platforms, a living quarter platform (XQ), a flare platform (XFP) and a processing platform (XPA) are the focus of this paper, providing an overview of the integrity assessment process. In order to ensure technical and operational integrity of these ageing facilities, the fitness for service of these offshore structures needs to be maintained. Assessments of the structural integrity of thirteen identified platforms under existing conditions were undertaken as these platforms are either nearing the end of their design life or have exceeded more than 50% of their design life. Information on history, characteristic data, condition data and inspection results were collected to assess the current state and to predict the future state of the facility for possible life extension. The information included but was not limited to as built data, brown fields modifications, additional risers and clamp-on conductors and incorporation of subsea and topside inspection findings. In-service integrity assessments, pushover analyses, corrosion control and cathodic protection assessments and weight control reports were completed to evaluate the integrity of these facilities for requalification to 2019 and life extension to 2030. The analytical models and calculations were updated based on the most recent inspection results and weight control reports. A requalification and life extension report was prepared for each platform to outline the performance criteria acceptance to achieve requalification until 2019 and life extension until 2030. This paper documents the methodology to assess the platform structural integrity in order to evaluate platform integrity for the remaining and extended design life. An overview of various aspects of ageing related to these offshore facilities, representing risk to the integrity, the required procedures and re assessment criteria for deciding on life extension of these facilities is presented. This paper also provides an overall view of the structural requirements, justifications and calibrations of the original design for the life extension to maintain the safety level by means of maintenance and inspection programs balancing the ageing mechanisms and improving the reliability of assessment results.

Deterministic Risk Methodology for Road Tunnels

2008 ◽  
Author(s):  
Peter Vidmar ◽  
Stojan Petelin
Keyword(s):  
Safety Assessment ◽  
Calculated Data ◽  
Assessment Process ◽  
Strong Impact ◽  
Road Tunnel ◽  
Risk Matrix ◽  
Tunnel Length ◽  
Fire Dynamics ◽  
Road Tunnels ◽  
Ventilation Conditions

The definition of the deterministic approach in safety analyses arises from the need to understand the conditions that emerge during a fire accident in a road tunnel. The key factor of the tunnel operations during the fire is the ventilation, which during the initial phases of the fire have a strong impact on the evacuation of people and later on the access of the intervention units in the tunnel. The paper presents the use of the CFD model in the tunnel safety assessment process. The set-up of the initial and boundary conditions and the requirement for grid density found from validation tests of an FDS (Fire Dynamics Simulator) is used to prepare three kinds of fire scenarios, 20MW, 50MW and 100MW, with different ventilation conditions; natural, semi transverse, transverse and longitudinal ventilation. The observed variables, soot density and temperature, are presented in minutes time steps through the entire tunnel length. Comparing the obtained data in a table allows the analyses of the ventilation conditions for different heat releases from fires. The second step is to add additional criteria of human behaviour inside the tunnel (evacuation) and human resistance to the elevated gas concentrations and temperature. What comes out is a fully deterministic risk matrix that is based on the calculated data where the risk is ranged on five levels, from the lowest to a very dangerous level. The deterministic risk matrix represents the alternative to a probabilistic safety assessment methodology, wherein the fire risk is represented in detail and the CFD (Computational Fluid Dynamics) model results are physically correct.

Procedures on Fracture Toughness Estimation Safety Assessment and Life Extension for In-Service High Pressure Vessels

2004 ◽  
Author(s):  
Guohua Chen ◽  
Bonuan Chen
Keyword(s):  
Fracture Toughness ◽  
High Pressure ◽  
Safety Assessment ◽  
Structural Integrity ◽  
Pressure Vessels ◽  
Life Extension ◽  
Temper Brittleness ◽  
Integrity Assessment ◽  
Treatment Processes ◽  
Material Fracture

Based on the typical in-service high pressure vessels made of PCrNi3MoVA for producing synthetic crystal, a systematic technology of material fracture toughness estimation, structural integrity assessment, and life extension is carried out for the in-service equipment with the following aspects: macroscopically and microscopically analyzing, the tests including KIC, AKV, FATT (50%), the predicting method of fracture, system safety assessment, and the life extension technology. Some practical conclusions can be obtained from the test and analysis as follows: The main failure factors for this kind of high pressure vessels include heat treatment processes, temper brittleness, and stress corrosion; It is found that the value of FATT (50%) increased very significantly; The comparison between the test results and the predicted results of the value of KIC is also performed, and it is shown that the value of KIC of in-service equipment can be estimated by the formula presented by Barsom-Rolfe or in API 579 with the value of AKV, The test temperature is recommended at least to reach 25 C (or room temperature) for the repaired vessels; The life extension technologies are put forward for this kind of in-service super-high pressure vessels.

scholarly journals Safety Assessment for Spatial Development

2013 ◽  
Vol 32 (2) ◽  
Author(s):  
David Řehák ◽  
Kateřina SikorovÁ ◽  
Pavel Senovský
Keyword(s):  
Risk Analysis ◽  
Safety Assessment ◽  
Software Tool ◽  
Vulnerability Index ◽  
Spatial Development ◽  
Assessment Process ◽  
Negative Effects ◽  
Impact Index ◽  
Online Software

AbstractRehak D., Sikorova K., Senovsky P.: Safety assessment for spatial development. Ekologia (Bratislava), Vol. 32, No. 2, p. 220-241, 2013.The article deals with the problems of operable safety assessment for spatial development to promote the preventive protection of population, engineering infrastructure and the environment against negative effects of spatial development. At present, many methods available for semi-quantitative risk analysis exist, but there is no method completely suitable for assessment of risks associated with spatial development. This is why a new method - Spatial Development Impact Assessment, which is based philosophically on the Fire & Explosion Index, Hazard & Vulnerability Index and Hazard & Impact Index - is presented in the article. The article describes the main tools of this method, namely assessment process algorithm, catalogue of hazard and asset groups and spatial development impact matrix. It demonstrates, by a case study on the safety assessment for spatial development using an online software tool developed for this purpose, the application of the method.

Trends in Scenario Development Methodologies and Integration in NUMO’s Approach

2010 ◽  
Author(s):  
Takeshi Ebashi ◽  
Katsuhiko Ishiguro ◽  
Keiichiro Wakasugi ◽  
Hideki Kawamura ◽  
Irina Gaus ◽  
...  
Keyword(s):  
Safety Assessment ◽  
International Workshop ◽  
Assessment Process ◽  
Scenario Development ◽  
Top Down ◽  
Initial State ◽  
Bottom Up ◽  
Starting Point ◽  
Consistent Treatment

The development of scenarios for quantitative or qualitative analysis is a key element of the assessment of the safety of geological disposal systems. As an outcome of an international workshop attended by European and the Japanese implementers, a number of features common to current methodologies could be identified, as well as trends in their evolution over time. In the late nineties, scenario development was often described as a bottom-up process, whereby scenarios were said to be developed in essence from FEP databases. Nowadays, it is recognised that, in practice, the approaches actually adopted are better described as top-down or “hybrid”, taking as their starting point an integrated (top-down) understanding of the system under consideration including uncertainties in initial state, sometimes assisted by the development of “storyboards”. A bottom-up element remains (hence the term “hybrid”) to the extent that FEP databases or FEP catalogues (including interactions) are still used, but the focus is generally on completeness checking, which occurs parallel to the main assessment process. Recent advances focus on the consistent treatment of uncertainties throughout the safety assessment and on the integration of operational safety and long term safety.

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