Analytical and Numerical Evaluation of the Impact Limiters Design of a Research Reactors Spent Fuel Transportation Package Half Scale Model Under 9 M Drop Tests

2008 ◽  
Author(s):  
Miguel Mattar Neto ◽  
Carlos A. J. Miranda ◽  
Gerson Fainer ◽  
Roge´rio P. Moura˜o
Keyword(s):  
Scale Model ◽  
Spent Fuel ◽  
Energy Agency ◽  
Dual Purpose ◽  
Research Reactors ◽  
Agency Support ◽  
Drop Tests ◽  
Accident Conditions ◽  
Regional Projects ◽  
The Impact

Since 2001, under the IAEA (International Atomic Energy Agency) support, some regional projects have been developed in Latin America to assess storage and transportion options for the research reactors spent fuel in the region. One of the projects tasks is the design and testing of a half scale model of a dual purpose (transportation and storage) package for research reactors spent fuel. Considering one of the hypothetical accident conditions, the 9 m drop test, this paper presents the impact limiters design evaluation of the above mentioned half scale model of the dual purpose package based on the impact limiters materials characterization, on the analytical assessment of the impact limiters sizing (dimensions and expected package acceleration levels) and on numerical simulations of the drop tests using a finite element explicit code. Conclusions and comments are addressed based on the obtained results.

An Experimental Study on Rigid-Object Water-Entry Impact and Contact Dynamics

2010 ◽  
Author(s):  
Ravi Challa ◽  
V. G. Idichandy ◽  
C. P. Vendhan ◽  
Solomon Yim
Keyword(s):  
Contact Dynamics ◽  
Experimental Results ◽  
Scale Model ◽  
Water Impact ◽  
Major Purpose ◽  
Closed Form Solutions ◽  
Numerical Studies ◽  
Wave Basin ◽  
Drop Tests ◽  
The Impact

The dynamics of a generic rigid water-landing object (WLO) during water impact is presented in this paper. Tests from a range of drop heights were performed in a wave basin using a 1/6th-Froude scale model of a practical prototype using different drop mechanisms to determine the water impact and contact effects. The first experimental case involved dropping the WLO by using a rope and pulley arrangement, while the second case employed an electromagnetic release to drop the object. Hydrodynamic parameters including peak acceleration, touchdown pressure and maximum impact/contact force were measured using the two different drop mechanisms. The WLO was assumed as rigid, so the experimental results could be correlated with von Karman and Wagner closed form solutions and the maximum accelerations predicted are bounded by these classical analytical solutions. The major purpose of this study are to use the experiments to determine trends that occur when the object is dropped from successive heights using different drop mechanisms by varying the entry speed, angle of impact and the weight of the object. The predictions from the experimental results were used for subsequent numerical studies. Results from the drop tests show that the impact acceleration and touchdown pressure increases practically linearly with the increase in the height of the drop and the data provides conditions of drop mechanism that keep impact accelerations under specified limits for the WLO prototype.

Analysis of the Impact of a Tunnel Fire Environment on a Spent Nuclear Fuel Transportation Cask

2003 ◽  
Author(s):  
Christopher S. Bajwa
Keyword(s):  
Pacific Northwest ◽  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Thermal Conditions ◽  
Nuclear Regulatory Commission ◽  
Radioactive Material ◽  
Spent Fuel ◽  
Tunnel Fire ◽  
Accident Conditions ◽  
The Impact

On July 18, 2001, a train carrying hazardous materials derailed and caught fire in the Howard Street railroad tunnel in Baltimore, Maryland. Due to this accident, questions were raised about the performance of spent nuclear fuel transportation casks under severe fire conditions, similar to those experienced in the Baltimore tunnel fire. The U.S. Nuclear Regulatory Commission (NRC) evaluates the performance of spent fuel transportation casks under accident conditions. Title 10 of the Code of Federal Regulations Part 71 section 73(c)(4), (10 CFR 71.73(c)(4)) requires that transportation packages used to ship radioactive material must be designed to resist an engulfing fire of a 30 minute duration and prevent release of radioactive material to the environment. The staff of the NRC, in cooperation with the National Transportation Safety Board, the National Institute of Standards and Technology, Pacific Northwest National Labs and the Center for Nuclear Waste Regulatory Analysis, have undertaken an analysis to determine the thermal conditions present in the Howard Street tunnel fire, as well as analyze the effects that such a fire would have on a spent fuel transportation cask. This paper describes the analytic models used in the assessment and presents a discussion of the results.

Design Enhancement of the CANDU Spent Fuel Storage Basket

2012 ◽  
Author(s):  
Woo-Seok Choi ◽  
Jae-Eon Jeon ◽  
Ki-Seog Seo ◽  
Ju-Chan Lee
Keyword(s):  
Structural Integrity ◽  
Drop Test ◽  
Test Facility ◽  
Test Model ◽  
Spent Fuel ◽  
Design Modification ◽  
Final Design ◽  
Fuel Storage ◽  
Accident Conditions ◽  
The Impact

The necessity of a demonstration test to evaluate the structural integrity of a basket for accident conditions arose during the license approval procedure for the WSPP’s dry storage facility, called MACSTOR/KN-400. A drop test facility for a demonstration was constructed at the KAERI (Korea Atomic Energy Research Institute) site, and demonstration tests for a basket drop were conducted. As the upper welding region of the loaded basket collided with the dropping basket during the drop test, the welding in this region was fractured and a leakage occurred after the drop test. An enhancement of the basket design is needed since the existing basket design was not able to satisfy the performance requirement. The directions for the design modification were determined and six enhanced designs were derived based on these directions. Structural analyses and specimen tests for each enhanced design were conducted. By evaluating the structural analysis and test results, one among six enhanced designs was decided as a final design for revision. The final design was the one that reduced the height of the central post of the basket and decreased the impact velocity with the dropping basket. Test basket models were fabricated in accordance with the final enhanced design. An additional demonstration test was performed for this test model and all the performance requirements were satisfied.

How Safe Is Safe Enough for a Chemical Weapons Destruction System?

2012 ◽  
Vol 46 (1) ◽  
pp. 92-101
Author(s):  
Joseph K. Asahina ◽  
Hisamitsu Shimoyama ◽  
Tsuyoshi Nishiyama ◽  
Atsushi Shinkai
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Lessons Learned ◽  
Chemical Weapons ◽  
Spent Fuel ◽  
Design Code ◽  
Energy Agency ◽  
Safety Design ◽  
The Impact

AbstractFollowing the earthquake in East Japan and the Fukushima Daiichi Nuclear Power Plant accident, the safety of highly technical projects such as those for chemical weapons destruction has come under scrutiny. This review includes consideration of the impact of outlier events on the recovery and destruction of sea-disposed munitions.At Port Kanda, Japan, a project for detection, recovery, and destruction of sea-dumped chemical munitions is ongoing, and approximately 3,000 items have been cleaned up as of the end of July 2011. In light of the recent earthquake and accident at the Fukushima Nuclear Power Plant, the authors review the safety design criteria for the system, including transportation based on the International Atomic Energy Agency spent-fuel transportation cask design and detonation chamber based on the new ASME design Code Case 2564 for impulsively loaded vessels. One of the important lessons learned from the disaster is that risks from earthquake and tsunami can be reduced when destruction of chemical weapons is done at the recovery site.

scholarly journals The Impact of B Corp Certification on Growth

2021 ◽  
Vol 13 (13) ◽  
pp. 7191
Author(s):  
Valerie Paelman ◽  
Philippe Van Cauwenberge ◽  
Heidi Vander Bauwhede
Keyword(s):  
Regression Analysis ◽  
Propensity Score ◽  
Panel Regression ◽  
Medium Term ◽  
Difference In Differences ◽  
Dual Purpose ◽  
Full Effect ◽  
The Impact ◽  
Positive Effect ◽  
Over Time

We empirically test whether B Corp certification affects the short- and medium-term growth rates of sustainable enterprises. These businesses are growing in popularity and prevalence but, due to their hybrid nature, often suffer from external credibility issues and competing internal logics. Because of the rigorous and time-involving audit procedure, B Corp certification potentially sends a credible signal about the sustainable nature of the enterprise to its stakeholders. In addition, the B Corp label could help to straighten out internal tensions and align the company towards its dual purpose. Hence, B Corp certification could contribute to company success. We observe 129 firms that were certified between 2013 and 2018 over a period between six years prior and five years post-certification. Using propensity score matching, we identify 129 non-certified matching companies. On this sample, we conduct a difference-in-differences panel regression analysis to investigate the effect of certification. Our dataset allows us to study how the effects of B Corp certification evolve over time, which was previously untested. Our study documents a positive effect of B Corp certification on turnover growth and also that this effect increases with the time since certification, implying that certification requires some time for its full effect to become apparent.

scholarly journals The Midlatitude Continental Convective Clouds Experiment (MC3E) sounding network: operations, processing and analysis

2015 ◽  
Vol 8 (1) ◽  
pp. 421-434 ◽  
Author(s):  
M. P. Jensen ◽  
T. Toto ◽  
D. Troyan ◽  
P. E. Ciesielski ◽  
D. Holdridge ◽  
...  
Keyword(s):  
Large Scale ◽  
Scale Model ◽  
Data Sets ◽  
Central Plains ◽  
Data Set ◽  
Convective Systems ◽  
Convective Clouds ◽  
Quality Checks ◽  
Network Operations ◽  
The Impact

Abstract. The Midlatitude Continental Convective Clouds Experiment (MC3E) took place during the spring of 2011 centered in north-central Oklahoma, USA. The main goal of this field campaign was to capture the dynamical and microphysical characteristics of precipitating convective systems in the US Central Plains. A major component of the campaign was a six-site radiosonde array designed to capture the large-scale variability of the atmospheric state with the intent of deriving model forcing data sets. Over the course of the 46-day MC3E campaign, a total of 1362 radiosondes were launched from the enhanced sonde network. This manuscript provides details on the instrumentation used as part of the sounding array, the data processing activities including quality checks and humidity bias corrections and an analysis of the impacts of bias correction and algorithm assumptions on the determination of convective levels and indices. It is found that corrections for known radiosonde humidity biases and assumptions regarding the characteristics of the surface convective parcel result in significant differences in the derived values of convective levels and indices in many soundings. In addition, the impact of including the humidity corrections and quality controls on the thermodynamic profiles that are used in the derivation of a large-scale model forcing data set are investigated. The results show a significant impact on the derived large-scale vertical velocity field illustrating the importance of addressing these humidity biases.

Sensitivity of the neutron multiplication factor to water ingress into a spent fuel cask

Kerntechnik ◽  
2020 ◽  
Vol 85 (1) ◽  
pp. 38-53
Author(s):  
M. J. Leotlela ◽  
I. Petr ◽  
A. Mathye
Keyword(s):  
Gradual Increase ◽  
Primary Objective ◽  
Fuel Pellet ◽  
Main Body ◽  
Spent Fuel ◽  
Reactivity Effect ◽  
Water Ingress ◽  
Accident Scenarios ◽  
The Impact ◽  
Gain Access

Abstract An essential component of safety analyses is the investigation of accident scenarios. In this paper water ingress scenarios of spent fuel containers, as they may occur during transport or storage, are examined. In the main body of this paper, a number of paths are studied through which water can gain access to the spent fuel cask and eventually reach the fuel pellet, potentially resulting in an increase in reactivity as a result of over-moderation. The primary objective of this project was to perform an assessment of what, in the unlikely event of a Fukushima- type accident, the impact would be on the reactivity of the cask by analyzing a gradual increase in water level in the spent fuel casks. In addition, the way the keff of the system responds to such an increase is discussed. The paper also provides the results of an assessment of the reactivity effect of water ingress via various pathways/channels.

scholarly journals Spent UO2 TRISO coated particles – instant release fraction and microstructure evolution

2015 ◽  
Vol 103 (6) ◽  
Author(s):  
Hildegard Curtius ◽  
Gabriele Kaiser ◽  
Norman Lieck ◽  
Murat Güngör ◽  
Martina Klinkenberg ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Spent Fuel ◽  
Coated Particles ◽  
The Impact ◽  
Very High

AbstractThe impact of burn-up on the instant release fraction (IRF) from spent fuel was studied using very high burn-up UO

Repeatable Dynamic Rollover Roof Test Fixture

2003 ◽  
Author(s):  
Donald Friedman ◽  
Acen Jordan ◽  
Carl Nash ◽  
Jack Bish ◽  
Terence Honikman ◽  
...  
Keyword(s):  
Longitudinal Axis ◽  
Rolling Motion ◽  
Passenger Compartment ◽  
Test Device ◽  
Test Fixture ◽  
Complete Vehicle ◽  
Entire Vehicle ◽  
Roll Rate ◽  
Drop Tests ◽  
The Impact

Experimental rollover tests have been criticized for their poor emulation of actual rollovers and for their lack of repeatability. We have designed and built a test fixture that overcomes both of these criticisms. The fixture holds a passenger compartment, weighted to match the inertia characteristics of a complete vehicle, or a complete vehicle at the appropriate pitch and yaw. The compartment is then rotated about its principal (longitudinal) axis through an arc that mimics the rolling motion of an entire vehicle. At the appropriate roll angle and falling velocity, the roof strikes a moving patch of concrete. The compartment is controlled throughout the sequence and is suspended after the impact, so that a sequence of impacts can be individually studied in separate tests. Initial tests have shown that we can achieve repeatable impacts. Test variables include pitch, yaw, roll rate and vehicle center of gravity motion (both lateral and vertical velocity). This test device addresses the various shortcomings of previous rollover tests, fixtures and the various static and drop tests of vehicles conducted to determine rollover performance.

Sign in / Sign up

Export Citation Format

Share Document