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Failure Analysis of Dispersion Fuel Elements Based on Matrix Cracking

Description: A mathematical model has been developed for estimati the burnup at which mechanical failure occurs in dispersion fuel elements. It is postulated that failure at low temperature, < 900 deg F, occurs as a result of brittle fracture of an elastic matrix when the intensity of the stress locally reaches the ultimate strength of the material. The contributions of fission gas pressure and thermal stress are incorporated in the stress analysis. Because of the complexity of the stress distribution and t… more
Date: December 28, 1961
Creator: Beck, S. D.
Partner: UNT Libraries Government Documents Department
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A laboratory based system for Laue micro x-ray diffraction

Description: A laboratory diffraction system capable of illuminating individual grains in a polycrystalline matrix is described. Using a microfocus x-ray source equipped with a tungsten anode and prefigured monocapillary optic, a micro-x-ray diffraction system with a 10 mum beam was developed. The beam profile generated by the ellipsoidal capillary was determined using the&quot;knife edge&quot; approach. Measurement of the capillary performance, indicated a beam divergence of 14 mrad and a useable energy ba… more
Date: February 28, 2007
Creator: Source, Advanced Light; Tamura, Nobumichi; Lynch, P. A.; Stevenson, A. W.; Liang, D.; Parry, D. et al.
Partner: UNT Libraries Government Documents Department
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Apparatus for real-time acoustic imaging of Rayleigh-Bénard convection

Description: We have successfully designed, built and tested an experimental apparatus which is capable of providing the first real-time ultrasound images of Rayleigh-B\'{e}nard convection in optically opaque fluids confined to large aspect ratio experimental cells. The apparatus employs a modified version of a commercially available ultrasound camera to capture images (30 frames per second) of flow patterns in a fluid undergoing Rayleigh Bénard convection. The apparatus was validated by observing convectio… more
Date: October 28, 2008
Creator: Kuehn, Kerry, K.
Partner: UNT Libraries Government Documents Department
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Using the Nova target chamber for high-yield targets

Description: The existing 2.2-m-radius Nova aluminum target chamber, coated and lined with boron-seeded carbon shields, is proposed for use with 1000-MJ-yield targets in the next laser facility. The laser beam and diagnostic holes in the target chamber are left open and the desired 10/sup -2/ Torr vacuum is maintained both inside and outside the target chamber; a larger target chamber room is the vacuum barrier to the atmosphere. The hole area available is three times that necessary to maintain a maximum fl… more
Date: September 28, 1987
Creator: Pitts, J.H.
Partner: UNT Libraries Government Documents Department
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Thermal stress in the edge cladding of Nova glass laser disks

Description: We calculated thermal stresses in Nova glass laser disks having light-absorbing edge cladding glass attached to the periphery with an epoxy adhesive. Our closed-form solutions indicated that, because the epoxy adhesive is only 25 ..mu..m across, it does not significantly affect the thermal stress in the disk or cladding glass. Our numerical results showed a peak tensile stress in the cladding glass of 24 MPa when the cladding glass had a uniform absorption coefficient of 7.5 cm/sup -1/. This pe… more
Date: September 28, 1987
Creator: Pitts, J. H.; Kong, M. K. & Gerhard, M. A.
Partner: UNT Libraries Government Documents Department
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Stress analysis of LOFT penetrations 1A, 2A, 3F, 5A-F, 7A, 9A, 17A-B, 20A-C, 21-A

Description: A stress analysis has been completed for the LOFT piping nozzles penetrating through the containment vessel in accordance with the 1965 edition of Section III of the ASME Boiler and Pressure Vessel Code. LOFT Specification S-1 states that the 1965 edition, including the addenda through the summer 1966 issue, be used. Stresses in the containment wall and in the nozzles result from mechanical and thermal loads on the piping that penetrate the nozzles. The mechanical loads were compiled in LTR 121… more
Date: September 28, 1978
Creator: Beers, R.J. Jr.
Partner: UNT Libraries Government Documents Department
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Forces on the conductors of the Arc AG Magnet

Description: In the evaluation of the design of the support system for the Arc AG Magnets, factors which could deform or move the magnet have to be considered. Typically they are the ground movements, temperature effects, water vibrations, magnetic forces on the magnet and coil, and accidental human or equipment impacts. This note calculates the magnetic forces on the conductors at an excitation for a 50 GeV beam. It is found that the force is not negligible; therefore, a method to restrict the movement of … more
Date: December 28, 1983
Creator: Weng, W. T.
Partner: UNT Libraries Government Documents Department
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Intergranular stress corrosion cracking: A rationalization of apparent differences among stress corrosion cracking tendencies for sensitized regions in the process water piping and in the tanks of SRS reactors

Description: The frequency of stress corrosion cracking in the near weld regions of the SRS reactor tank walls is apparently lower than the cracking frequency near the pipe-to-pipe welds in the primary cooling water system. The difference in cracking tendency can be attributed to differences in the welding processes, fabrication schedules, near weld residual stresses, exposure conditions and other system variables. This memorandum discusses the technical issues that may account the differences in cracking t… more
Date: September 28, 1990
Creator: Louthan, M.R.
Partner: UNT Libraries Government Documents Department
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Stress-induced transverse isotropy in rocks

Description: The application of uniaxial pressure can induce elastic anisotropy in otherwise isotropic rock. We consider models based on two very different rock classes, granites and weakly consolidated granular systems. We show that these models share common underlying assumptions, that they lead to similar qualitative behavior, and that both provide a microscopic basis for elliptical anisotropy. In the granular case, we make experimentally verifiable predictions regarding the horizontally propagating mode… more
Date: March 28, 1994
Creator: Schwartz, L. M.; Murphy, W. F. III & Berryman, J. G.
Partner: UNT Libraries Government Documents Department
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Analytical considerations for K-downcomer and bellows

Description: A free body diagram of the bellows will show the possibility of three forces -- one in each direction, three moments -- one in each plane, and the internal pressure. Any or all of these forces and moments may fluctuate due to variations in a driving force, e.g., separation of streamlines which creates slugging of flow through an elbow. Whereas the static equilibrium condition can be analyzed and stresses and strains computed, the dynamic condition cannot be approached without information on the… more
Date: February 28, 1961
Creator: Lomax, C. C.
Partner: UNT Libraries Government Documents Department
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Intergranular stress corrosion cracking: A rationalization of apparent differences among stress corrosion cracking tendencies for sensitized regions in the process water piping and in the tanks of SRS reactors

Description: The frequency of stress corrosion cracking in the near weld regions of the SRS reactor tank walls is apparently lower than the cracking frequency near the pipe-to-pipe welds in the primary cooling water system. The difference in cracking tendency can be attributed to differences in the welding processes, fabrication schedules, near weld residual stresses, exposure conditions and other system variables. This memorandum discusses the technical issues that may account the differences in cracking t… more
Date: September 28, 1990
Creator: Louthan, M. R.
Partner: UNT Libraries Government Documents Department
open access

Design of the Hoisting System for D-Zero Collision Hall Pit

Description: A hoisting rail system has been designed for lifting loads from the north sidewalk of the D0 collision hall into the collision hall pit. This engineering note documents the design. The hoisting system was conceived primarily to aid in getting heavy loads into the pit during short (less than a few days) accesses. The typical use for the hoist will be to lift a BLS power supply (120 lbs) and carrier (16 lbs) from a roll around cart on the sidewalk and onto a similar cart in the collision hall pit… more
Date: February 28, 2002
Creator: Rucinski, Russell A.
Partner: UNT Libraries Government Documents Department
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Helium pressures in RHIC vacuum cryostats and relief valve requirements from magnet cooling line failure

Description: A catastrophic failure of the RHIC magnet cooling lines, similar to the LHC superconducting bus failure incident, would pressurize the insulating vacuum in the magnet and transfer line cryostats. Insufficient relief valves on the cryostats could cause a structural failure. A SINDA/FLUINT{reg_sign} model, which simulated the 4.5K/4 atm helium flowing through the magnet cooling system distribution lines, then through a line break into the vacuum cryostat and discharging via the reliefs into the R… more
Date: March 28, 2011
Creator: Liaw, C. J.; Than, Y. & Tuozzolo, J.
Partner: UNT Libraries Government Documents Department
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D0 Silicon Upgrade: Upgrade Piping Loads on Cleanroom Roof

Description: The proposed piping layout for the DO upgrade will run along the south wall of DAB. The cryogenic service pipe runs above the upper and lower cleanroom roofs and will need to be supported by the roofs beams. Calculations were done to determine the stresses in the I-beams created by the existing and additional loads due to the upgrade. Refer to drawing no. 3823.115-ME-317283 for drawings of the piping layout. Figure 1 shows the 'plan view' portion of this drawing. The weight of the individual li… more
Date: August 28, 1995
Creator: Sakla, Steve
Partner: UNT Libraries Government Documents Department
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Open-Midplane Dipoles for a Muon Collider

Description: For a muon collider with copious decay particles in the plane of the storage ring, open-midplane dipoles (OMD) may be preferable to tungsten-shielded cosine-theta dipoles of large aperture. The OMD should have its midplane completely free of material, so as to dodge the radiation from decaying muons. Analysis funded by a Phase I SBIR suggests that a field of 10-20 T should be feasible, with homogeneity of 1 x 10{sup -4} and energy deposition low enough for conduction cooling to 4.2 K helium. If… more
Date: March 28, 2011
Creator: Weggel, R.; Gupta, R. & Kolonko, J., Scanlan, R., Cline, D., Ding, X., Anerella, M., Kirk, H., Palmer, B., Schmalzle, J.
Partner: UNT Libraries Government Documents Department
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Apparatus for spot welding sheathed thermocouples to the inside of small-diameter tubes at precise locations

Description: Equipment and procedures used to spot weld tantalum- or stainless-steel-sheathed thermocouples to the inside diameter of Zircaloy tubing to meet the requirements of the Multirod Burst Test (MRBT) Program at ORNL are described. Spot welding and oxide cleaning tools were fabricated to remove the oxide coating on the Zircaloy tubing at local areas and spot weld four thermocouples separated circumferentially by 90/sup 0/ at any axial distribution desired. It was found necessary to apply a nickel co… more
Date: June 28, 1976
Creator: Baucum, W. E. & Dial, R. E.
Partner: UNT Libraries Government Documents Department
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LOFT Small Break Test Themocouple Installation

Description: The subject thermocouple design has been analyzed for maximum expected hydraulic loading and found to be adequate. The natural frequency of the thermocouple was found to be between the vortex shedding frequencies for the gas and liquid phase so that a tendency for resonance will exist. However, since the thermocouple support will have a restricted displacement, stresses found are below the endurance limit and, thus, are acceptable in respect to fatigue life as well as primary stress due to pres… more
Date: May 28, 1980
Creator: Fors, R. M.
Partner: UNT Libraries Government Documents Department
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D0 Silicon Upgrade: Scaffolding Plateform at Muon Chamber

Description: The design for the scaffolding platform which will be connected to the muon chamber wall was analyzed for a load rating of 400 lbs. The platform is supported on each end and the calculations were done for the full 400 lbs. on the end of the horizontal beam. Both members were analyzed for maximum stresses and were compared to the allowable stress, and both members were found to be acceptable in accordance with the ASCE and AISC specifications. The only recommendation is for all the 3/8-inch stee… more
Date: July 28, 1995
Creator: Kuwazaki, Andrew
Partner: UNT Libraries Government Documents Department
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Project Reports

Description: Dielectric polarization of a material under the magnetic field or an induced magnetization under the electric field requires the simultaneous presence of long-range ordering of magnetic moments and electric dipoles. Single phase materials suffer from the drawback that the magnetoelectric (ME) effect is considerably weak even at low temperatures, limiting their applicability in practical devices. Better alternatives are ME composites that have large magnitudes of the ME voltage coefficient. The … more
Date: March 28, 2007
Creator: Priya, Shashank
Partner: UNT Libraries Government Documents Department
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Shock Hugoniot of Single Crystal Copper

Description: The shock Hugoniot of single crystal copper is reported for stresses below 66 GPa. Symmetric impact experiments were used to measure the Hugoniots of three different crystal orientations of copper, [100], [110], [111]. The photonic doppler velocimetry (PDV) diagnostic was adapted into a very high precision time of arrival detector for these experiments. The measured Hugoniots along all three crystal directions were nearly identical to the experimental Hugoniot for polycrystalline Cu. The predic… more
Date: August 28, 2009
Creator: Chau, R; Stolken, J; Asoka-Kumar, P; Kumar, M & Holmes, N C
Partner: UNT Libraries Government Documents Department
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Effects of Slip Planes on Stresses in MICE Coupling Solenoid Coil Assembly

Description: The MICE superconducting coupling solenoid magnet is made from copper matrix Nb-Ti conductors with inner radius of 750 mm, length of 285 mm and thickness of 110.4 mm at room temperature. The coil is to be wound on a mandrel made of aluminum. The peak magnetic field on the conductor is about 7.3 T when fully charged at 210 A. High magnetic field and large size make the stress inside the coupling coil assembly relatively high during cool down and full energizing. The shear stress between coil win… more
Date: June 28, 2010
Creator: Wang, Li; Pan, Heng; Wu, Hong; Guo, XingLong; Cheng, Y. & Green, Michael A
Partner: UNT Libraries Government Documents Department
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