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Thermomechanical analysis of the ITER breeding blanket

Description: Thermomechanical performance of the ITER breeding blanket is an important design issue because it requires first, that the thermal expansion mismatch between the blanket structure and the blankets internals (such as, beryllium multiplier and tritium breeders) can be accommodated without creating high stresses, and second, that the thermomechanical deformation of various interfaces within the blanket does not create high resistance to heat flow and consequent unacceptably high temperatures in th… more
Date: March 1, 1997
Creator: Majumdar, S.; Gruhn, H.; Gohar, Y. & Giegerich, M.
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Partner: UNT Libraries Government Documents Department
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Stabilizers in PBX 9501

Description: An analysis of the analytical data from initial acceptance of PBX 9501 at Pantex and the current analysis of the library samples of the same lots show that the amount of Irganox has reduced linearly with time in the library samples. Data from the cycle reports show no negative trend in a sealed inert atmosphere. We also found that the stockpile return samples show very little change, both by thermal analysis with the ARC and chemical analysis by NMR, and can be said to be aging gracefully.
Date: December 1, 1997
Creator: Campbell, M.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of characterization of plutonium storage containers

Description: As a result of the end of the Cold War, at least 11,000 (possibly 20,000 or more) plutonium pits are projected to be stored at Pantex for up to fifty years. The current pit container, the ALR8 was not designed for this length of storage duration. As a result, Pantex officials have searched for alternative container options. The objective of this research is to develop and validate a model to predict the temperature distribution within the stored components and the internal structure of the prop… more
Date: February 1, 1999
Creator: James, D. & Stevkovski, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High explosive violent reaction (HEVR) from slow heating conditions

Description: The high explosives (HEs) developed and used at the Los Alamos National Laboratory are designed to be insensitive to impact and thermal insults under all but the most extreme conditions. Nevertheless, violent reactions do occasionally occur when HE is involved in an accident. The HE response is closely dependent on the type of external stimulus that initiates the reaction. For example, fast heating of conventional HE will probably result in fairly benign burning, while long-term, slow heating o… more
Date: March 1, 1999
Creator: Vigil, A.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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APT Blanket System Loss-of-Coolant Accident (LOCA) Based on Initial Conceptual Design - Case 1: External HR Break Near Inlet Header

Description: The APT blanket system has about 57 MW of thermal energy deposited within the blanket region under normal operating conditions from the release of neutrons and the interaction of the High energy particles with the blanket materials. This corresponds to about 48 percent of total thermal energy deposited in the APT target/blanket system. The deposited thermal energy under normal operation conditions is an important input parameter used in the thermal-hydraulic design and accident analysis.
Date: October 7, 1998
Creator: Hamm, L.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A preliminary analysis of the APS crotch design

Description: A preliminary design analysis of the absorber plate of the proposed crotch for the APS bending magnet radiation is presented. Various design aspects including thermal and structural considerations, material selection, geometry, and cooling method are discussed and a number of recommendations are made.
Date: March 1, 1990
Creator: Khounsary, A.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A study of heat transfer for two layered composite inclined plate crotch absorbers

Description: Since a copper plate (Z=29) absorbs most of the photon energy very near the surface, the temperature of the surface becomes very high despite of having a high thermal conductivity. On the other hand, a beryllium plate( Z=4) can diffuse the intense radiation throughout the depth of its plate by allowing photons to penetrate, but has a low thermal conductivity (about half of that of a copper). As an effort to combine both merits of Be and Cu, a Be-Cu composite absorber was developed and has been … more
Date: November 1, 1989
Creator: Choi, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analytical prediction of the location of ductility dip cracking in the trans-varestraint test

Description: Some NiCrFe weld metals exhibit decreased ductility over a temperature range known as the {open_quotes}ductility dip{close_quotes} temperature (DDT) range. Ductility dip cracking (DDT) is a phenomenon which occurs in a zone bounded by the DDT range on its sides and a threshold plastic strain on its bottom as shown in figure 1. Figure 1 illustrates how ductility varies as weld metal cools from the solidus temperature for materials with and without a ductility dip. The purpose of this work is to … more
Date: May 1, 1997
Creator: Singh, I.; Kroenke, W. & Cola, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of metal-clad filled evacuated panel superinsulation

Description: This Cooperative Research and Development Agreement (CRADA) was between Aladdin Industries, Inc. and Lockheed Martin Energy Research Corp. The purpose of the CRADA was to determine the thermal performance of various metal claddings used to encapsulate Filled Evacuated Panel (FEP) superinsulation and to optimize the cost versus thermal performance of the claddings. A FEP superinsulation is a new type of superinsulation with the potential for saving large amounts of energy in buildings, building … more
Date: March 1, 1997
Creator: Wilkes, K. E.; Strizak, J. P.; Weaver, F. J.; Besser, J. E. & Smith, D. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermal Analysis of a SHIELD Electromigration Test Structure

Description: The steady state and transient thermal behavior of an electromigration test structure was analyzed. The test structure was a Sandia SHIELD (Self-stressing HIgh fregquency rELiability Device) electromigration test device manufactured by an outside vendor. This device has a high frequency oscillator circuit, a buffer circuit to isolate and drive the metal line to the tested (DUT), the DUT to be electromigrated itself, a metal resistance thermometry monitor, and a heater elment to temperature acce… more
Date: May 1, 1999
Creator: Benson, David A.; Bowman, Duane J. & Mitchell, Robert T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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APT Blanket Thermal Analysis of Cavity Flood Cooling with a Beam Window Break

Description: The cavity flood system is designed to be the primary safeguard for the integrity of the blanket modules and target assemblies during loss of coolant accidents, LOCA''s. In the unlikely event that the internal flow passages in a blanket module or a target assembly dryout, decay heat in the metal structures will be dissipated to the cavity flood system through the module or assembly walls. This study supplements the two previous studies by demonstrating that the cavity flood system can adequatel… more
Date: November 19, 1999
Creator: Shadday, M.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Resorcinol-formaldehyde and carbon aerogel microspheres

Description: Aerogels are a unique class of materials possessing an open-cell structure with ultrafine cells/pores (<100nm), high surface area (400--1100 m{sup 2}/g), and a solid matrix composed of interconnected particles, fibers, or platelets with characteristic dimensions of 10nm. Although monolithic aerogels are ideal candidates for many applications (e.g. transparent window insulation), current processing methods have limited their introduction into the commercial marketplace. Our research focuses on t… more
Date: April 1996
Creator: Alviso, C. T.; Pekela, R. W.; Gross, J.; Lu, X.; Caps, R. & Fricke, J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Transient Mirror Heating Theory and Experiment in the Jefferson Lab IR Demo FEL

Description: During commissioning of the IR Demo FEL at Jefferson Lab, we noticed that the FEL exhibited a rapid power drop with time when the first set of 3 mu-m mirrors was used. Thought the rate of power drop was unexpected, it was thought that it could be due to a distortion of the mirrors during a time short compared to a the thermal diffusion time. This transient distortion might affect the laser more than the steady state distortion. This paper presents some analysis of the transient mirror heating p… more
Date: January 1, 2001
Creator: Benson, S.; Shinn., Michelle D. & Neil, G.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thermal-Structural Analysis of the MacArthur Maze Freeway Collapse

Description: At approximately 3:41 AM on the morning of April 29, 2007, a tractor-trailer rig carrying 8,600 gallons (32.6 m{sup 3}) of fuel overturned on Interstate 880 in Oakland, CA. The resultant fire weakened the surrounding steel superstructure and caused a 50-yard (45.7 m) long section of the above connecting ramp from Interstate 80 to Interstate 580 to fail in approximately 18 minutes. In this study, we performed a loosely-coupled thermal-structural finite element analysis of the freeway using the L… more
Date: February 26, 2008
Creator: Noble, C. R.; Wemhoff, A. P. & McMichael, L. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thermal Analysis of Irradiation Experiments in the ATR

Description: Reactor material testing in the INL's Advanced Test Reactor (ATR) involves modeling and simulation of each experiment to accurately determine the irradiation temperature. This paper describes thermal analysis of capsule experiments using gas gap temperature control and provides data on recent material tests that validate the modeling results. Static capsule experiments and lead-out capsule experiments are discussed. The source of temperature variation in capsule experiments and ways to mitigate… more
Date: September 1, 2012
Creator: Murray, Paul
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design of rf-cavities in the funnel of accelerators for transmutation technologies

Description: Funnels are a key component of accelerator structures proposed for transmutation technologies. In addition to conventional accelerator elements, specialized rf-cavities are needed for these structures. Simulations were done to obtain their electromagnetic field distribution and to minimize the rf-induced heat loads. Using these results a structural and thermal analysis of these cavities was performed to insure their reliability at high average power and to determine their cooling requirements. … more
Date: September 1, 1994
Creator: Krawczyk, F. L.; Bultman, N. K.; Chan, K. D. C.; Martineau, R. L.; Nath, S. & Young, L. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Studies of ionic liquids in lithium-ion battery test systems

Description: In this work, thermal and electrochemical properties of neat and mixed ionic liquid - lithium salt systems have been studied. The presence of a lithium salt causes both thermal and phase-behavior changes. Differential scanning calorimeter DSC and thermal gravimetric analysis TGA were used for thermal analysis for several imidazolium bis(trifluoromethylsulfonyl)imide, trifluoromethansulfonate, BF{sub 4}, and PF{sub 6} systems. Conductivities and diffusion coefficient have been measured for some … more
Date: June 1, 2006
Creator: Salminen, Justin; Prausnitz, John M. & Newman, John
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thermal Analysis of a H1616-1 Shipping container in Hypothetical Accident conditions

Description: The thermal response of the H1616 transport container is simulated to demonstrate compliance with the Federal regulations for performance during hypothetical accident conditions (HAC). The goal is to show that tests conducted for the certification of the H1616 shipping container provide conservatively high estimates of temperatures at key regions within the container. A one-dimensional computational model is developed to simulate the thermal response of the shipping container in cylindrical coo… more
Date: November 2002
Creator: Hollenshead, Jeromy T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Small-business technology transfer program, case number 93119 - second harmonic generation for Lee Laser Inc.: Resonator designs

Description: The author has investigated several resonator designs for Lee Laser Inc. as outlined in the Short-Term Technical Assistance Project, case number 93119. The scope of this work was to identify various resonator options which would be suitable for use in an intra-cavity doubled Nd:YAG laser and compatible with Lee Laser hardware. This work consisted of computer modeling of laser resonators to identify mirror curvatures, distances, beam sizes, and sensitivity to thermal loading of the laser rod.
Date: September 2, 1994
Creator: Erbert, G.V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Precision alignment of the Advanced Light Source U5.0 and U8.0 undulators

Description: The U5.0 and U8.0 undulators for the Advanced Light Source (ALS) incorporate 4.6-m-long, hybrid-configuration magnetic structures. The structures consist of modules with half-period pole assemblies mounted on 0.8-m-long aluminum mounts, which are in turn attached to continuous steel backing beams. The vertical and longitudinal alignment tolerances for the poles of these structures are 25 microns and 50 microns, respectively, over the entire 4.6-m length of the devices. To meet these tolerances,… more
Date: July 1, 1993
Creator: Humphries, D.; Chin, J.; Connors, R.; Cummings, J.; Keffler, T.; Gath, W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of pressure on the orientational ordering and phase transitions in solid C{sub 60} and C{sub 70}

Description: The temperature-pressure phase diagrams of solid C{sub 60} and C{sub 70} have been determined and compared. A significant finding is the large influence of interstitial species and of the pressure transmitting medium on the orientational ordering processes. The pressure results reveal different, nearly degenerate configurations in both solids, which are believed to be due to hindered molecular rotations by interstitial species, and possibly different stacking modes in C{sub 70}.
Date: August 1, 1993
Creator: Samara, G. A.; Hansen, L. V.; Morosin, B. & Schirber, J. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thermal testing of packages for transport of radioactive wastes

Description: Shipping containers for radioactive materials must be shown capable of surviving tests specified by regulations such as Title 10, Code of Federal Regulations, Part 71 (called 10CFR71 in this paper) within the United States. Equivalent regulations hold for other countries such as Safety Series 6 issued by the International Atomic Energy Agency. The containers must be shown to be capable of surviving, in order, drop tests, puncture tests, and thermal tests. Immersion testing in water is also requ… more
Date: December 31, 1994
Creator: Koski, J.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thermal and flow analyses of the Nuclear Materials Storage Facility Renovation Title I 60% design

Description: The authors are continuing to use the computational fluid dynamics code CFX-4.2 to evaluate the steady-state thermal-hydraulic conditions in the Nuclear Material Storage Facility Renovation Title 1 60% Design. The analyses build on those performed for the 30% design. They have run an additional 9 cases to investigate both the performance of the passive vault and of an individual drywell. These cases investigated the effect of wind on the inlet tower, the importance of resolving boundary layers … more
Date: August 1, 1998
Creator: Knight, T. D.; Steinke, R. G. & Mueller, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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