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Nutt W.M.,Argonne National Laboratory | Howard R.,Oak Ridge National Laboratory | Busch I.,Oak Ridge National Laboratory | Carter J.,Savannah River National Laboratory | And 5 more authors.
14th International High-Level Radioactive Waste Management Conference, IHLRWMC 2013: Integrating Storage, Transportation, and Disposal | Year: 2013

Preliminary system-level analyses of the interfaces between at-reactor used fuel management, consolidated storage facilities, and disposal facilities, along with the development of supporting logistics simulation tools, have been initiated to provide the U.S. Department of Energy (DOE) and other stakeholders with information regarding the various alternatives for managing used nuclear fuel (UNF) generated by the current fleet of light water reactors operating in the United States. An important UNF management system interface consideration is the need for ultimate disposal of UNF assemblies contained in waste packages that are sized to be compatible with different geologic media. Thermal analyses indicate that waste package sizes for the geologic media under consideration by the Used Fuel Disposition Campaign may be significantly smaller than the canisters being used for on-site dry storage by the nuclear utilities. Therefore, at some point along the UNF disposition pathway, there could be a need to repackage fuel assemblies already loaded and being loaded into the dry storage canisters currently in use. The implications of where and when the packaging or repackaging of commercial UNF will occur are key questions being addressed in this evaluation. The analysis demonstrated that thermal considerations will have a major impact on the operation of the system and that acceptance priority, rates, and facility start dates have significant system implications.


Flaim T.A.,Complex Systems LLC | Flaim N.B.,Complex Systems LLC | Greening C.W.,Greening Associates Inc | Greening B.D.,Greening Associates Inc
SAE Technical Papers | Year: 2013

In addition to traditional load-deformation response of brake friction materials at constant load (compressibility), measurements for creep (time dependent deformation at constant load), and transient deformation response under increasing (apply) and decreasing (release) linear loading cycles have been measured and reported. One additional load-deformation response characteristic of brake friction materials that can be studied using the Greening Model 1140 test technology is that of nonlinear hysteresis under cyclic loading conditions (both linear and nonlinear). This presentation discusses the measurement of low frequency (< 10 Hz) deformation response of brake friction materials, how these measured results can be objectively quantified and normalized as well as how these measurements might provide additional insight into the 'internal friction' mechanisms of these complex composites. Copyright © 2013 SAE International.


Antanaitis D.B.,General Motors | Riefe M.,General Motors | Ciechoski C.,Durez Corporation | Flaim T.,Complex Systems LLC | Greening C.,Greening Associates Inc.
SAE International Journal of Passenger Cars - Mechanical Systems | Year: 2013

The brake caliper piston plays a key role in caliper function, taking significant responsibility for qualities such as fluid consumption, insulation of the brake fluid from heat, seal rollback function, and brake torque variation sensitivity to disc thickness variation. It operates in a strenuous environment, being routinely subjected to high stresses and elevated temperatures. Given all of the demands on this safety-critical component (strength, stiffness, wear resistance, stable friction against rubber, thermal stability, machinability, manageable thermal conductivity, and more), there are actually relatively few engineering materials suitable for use as a caliper piston, and designs tend to be limited to steel, aluminum, and engineered plastics (phenolic composites). The lattermost - phenolic composites - has been of especial interest recently due to mass savings and possible reduction in brake corner judder sensitivity to disc thickness variation. This paper focuses on characterizing two important mechanical characteristics, stiffness and damping, of the most common piston materials, steel and phenolic. Data are shown first suggesting the effect of piston material on brake performance, and then stiffness and damping data from different methodologies are presented. From these data, a preferred methodology is recommended and results are reconciled with brake corner subsystem performance and modeling. Copyright © 2013 SAE International.


Nutt M.,Argonne National Laboratory | Voegele M.,Complex Systems LLC | Birkholzer J.,Lawrence Berkeley National Laboratory | Swift P.,Sandia National Laboratories | And 3 more authors.
Proceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM | Year: 2011

The U.S. Department of Energy Office of Nuclear Energy (DOE-NE), Office of Fuel Cycle Technologies (OFCT) has established the Used Fuel Disposition Campaign (UFDC) to conduct research and development (R&D) activities related to storage, transportation and disposal of used nuclear fuel (UNF) and high level radioactive waste (HLW). The U.S. has, in accordance with the U.S. Nuclear Waste Policy Act (as amended), focused efforts for the past twentyplus years on disposing of UNF and HLW in a geologic repository at Yucca Mountain, Nevada. The recent decision by the U.S. DOE to no longer pursue the development of that repository has necessitated investigating alternative concepts for the disposal of UNF and HLW that exists today and that could be generated under future fuel cycles. The disposal of UNF and HLW in a range of geologic media has been investigated internationally. Considerable progress has been made by in the U.S and other nations, but gaps in knowledge still exist. The U.S. national laboratories have participated in these programs and have conducted R&D related to these issues to a limited extent. However, a comprehensive R&D program investigating a variety of storage, geologic media, and disposal concepts has not been a part of the U.S. waste management program since the mid 1980s because of its focus on the Yucca Mountain site. Such a comprehensive R&D program is being developed and executed in the UFDC using a systematic approach to identify potential R&D opportunities. This paper describes the process used by the UFDC to identify and prioritize R&D opportunities. The U.S. DOE has cooperated and collaborated with other countries in many different "arenas" including the Nuclear Energy Agency (NEA) within the Organisation for Economic Co-operation and Development (OECD), the International Atomic Energy Agency (IAEA), and through bilateral agreements with other countries. These international activities benefited the DOE through the acquisition and exchange of information, database development, and peer reviews by experts from other countries. Recognizing that programs in other countries have made significant advances in understanding a wide range of geologic environments, the UFDC has developed a strategy for continued, and expanded, international collaboration. This paper also describes this strategy. Copyright © 2011 by ASME.


Vakulenko A.A.,Complex Systems LLC | Sytnik D.A.,Complex Systems LLC
Journal of Theoretical and Applied Information Technology | Year: 2015

In decision support systems, one of the tools for solving multicriteria choice problems is the analytic hierarchy process. This method uses a large amount of data. To improve the efficiency of decision-making, the method of interactive visualization of multidimensional data is proposed. The method makes it possible to change the hierarchical structure of objectives in the choice problem, set weights of objective functions at each of the hierarchy levels, and observe the quantitative dependencies of the objective function using graphs. The method is based on the combination and modification of charts: a bar graph, a Tree Map and a flat organizational chart. The modification involves adding interactive elements, making it possible to change the hierarchical structure, change the quantitative values of individual parameters and the weighting factors, select a range of values, as well as encoding quantitative values using the gradient transition of color to display the relationships between the values of the objective functions of different hierarchy levels. Continuous interactive actions of the user result in a corresponding change in graphically displayed items. It provides fast feedback between the user and the decision support system. The practical implementation of the method will provide ease of perception of choosing, setting rules for decision-making, ease of explaining the main reasons, influencing the choice of solutions, high-speed operation. © 2005 - 2015 JATIT & LLS. All rights reserved.


Volkov A.V.,Complex Systems LLC | Sytnik D.A.,Complex Systems LLC
Journal of Theoretical and Applied Information Technology | Year: 2015

The objective of this article is the study of existing approaches to extraction and structuring of data about information objects from news flow and development of the original approach to solution of that task. The article covers the approach to extraction of data about information objects based on domain otology. The developed model of information objects extracted from text is described, as well as the complex of linguistic resources applied for implementation of extraction from text of data about various types of information objects. This article gives a brief description of processing. The stage of extraction of data about information objects includes three phases: named entity recognition; inter-object relationship extraction; building complex information objects (events). For extraction of information from text, rule-based approach is used. © 2005 - 2015 JATIT & LLS.


Nutt W.M.,Argonne National Laboratory | Trail C.,Argonne National Laboratory | Cotton T.,Complex Systems LLC | Howard R.,Oak Ridge National Laboratory | Van Den Akker B.,Oak Ridge National Laboratory
15th International High-Level Radioactive Waste Management Conference 2015, IHLRWM 2015 | Year: 2015

The evaluation of alternative UNF acceptance strategies resulted in several high level insights, identified additional analyses that should be performed, and identified necessary waste management system model enhancements. At a summary level, these are: Site-specific allocation/acceptance strategies could lead to significant benefits with respect to at-reactor management logistics and costs. Such strategies may allow for more efficient clearing of UNF from the reactor sites than would be attainable under an oldest-fuel-first allocation approach. Accelerating acceptance can also have benefits with respect to at-reactor management logistics and costs. Accelerating acceptance in combination with site-specific allocation/ acceptance could potentially be the most efficient approach for clearing UNF from the reactor sites. However, very aggressive allocation/acceptance strategies and rates would be challenging, if not impossible, to achieve considering the constraints associated with moving UNF at the reactor sites. Additional evaluation of UNF acceptance strategies is necessary to better understand their feasibility with respect to reactor site operations. Waste management system analysis tools need to be improved to better represent windows when UNF can be moved at the reactor sites. The strategy for accepting UNF from the reactor fleets will have an impact on the design, configuration, and operation of an ISF. The form of the UNF that would be accepted (canisters, bare fuel assemblies) and the rate the UNF is accepted will effect the number of canister/cask processing bays needed and the overall amount of UNF that would be stored at the ISF. The selection of an acceptance rate from the reactor fleet (i.e., 3,000 MTHM/yr) may influence the preferred strategy regarding the form of the UNF that would be accepted. From an overall system perspective, there may be advantages to accepting all UNF in dual-purpose canisters for acceptance rates on the order of 3,000 MTHM/yr. However, it may be beneficial to accept both bare fuel in re-useable transportation casks along with dual-purpose canisters if the acceptance rate is increased. Improved confidence in at-reactor UNF management costs along with better understanding of ISF design concepts would allow for better understanding of system impacts of different UNF allocation/acceptance strategies. The NFST is currently developing modular ISF design concepts for dry storage and the results from that effort can be implemented into future waste management system analyses. However, the development of ISF design concepts for bare fuel storage is not as mature. Constraints on UNF transportation casks/overpacks, such as thermal or radiation exposure limits, can have a significant impact on the ability to clear UNF from reactor sites for the different UNF allocation/acceptance strategies. These constraints are well understood for DPC systems. Designs designs certified by the U.S. NRC to meet the 10 CFR 71 requirements for re-useable transportation are limited and at present it was necessary to assume those constraints for large re-useable bare fuel casks transported via rail in the analyses completed to date. Bare fuel cask design concept development work underway should provide a better understanding of those constraints. The approach for loading DPCs in current system analysis modeling tools do not reflect how they are typically loaded or would be loaded at the reactor sites while taking thermal limits into account. The current waste management system analysis tools also do not estimate external radiation exposure on loaded transportation casks/overpacks for comparison with 10 CFR 71 limits. Efforts are being initiated to define these approaches and implement them into waste management system analysis tools.


Trademark
Complex Systems Inc. | Date: 2012-11-15

Computer programs for use in banking and financial services for payments processing, namely, for ensuring secure messaging capability pertaining to financial transactions, and user manuals sold therewith.


Trademark
Complex Systems Inc. | Date: 2016-07-25

Computer software for use by banks and their customers for the administration of international trade transactions, namely, the preparation and management of letters of credit, stand-by letters of credit, guarantees, import / export documents and funds collection, that may be downloaded from a global computer network.

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