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Theoretical description of laser melt pool dynamics, Task order number B239634, Quarter 3 report

Description: Melting of solid matter under laser radiation is realized in almost every process of laser technology. The present paper addresses melted material flows in cases when melt zones are shallow, i.e., the zone width is appreciably greater than or of the same order as its depth. Such conditions are usually realized when hardening, doping or perforating thin plates or when using none-deep penetration. Melted material flowing under conditions of deep penetration, drilling of deep openings and cutting … more
Date: May 10, 1995
Creator: Dykhne, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Radionuclides in hydrothermal systems as indicators of repository conditions

Description: Hydrothermal systems in tuffaceous and older sedimentary rocks contain evidence of the interaction of radionuclides in fluids with rock matrix minerals and with materials lining fractures, in settings somewhat analogous to the candidate repository site at Yucca Mountain, NV. Earlier studies encompassed the occurrences of U and Th in a ``fossil`` hydrothermal system in tuffaceous rock of the San Juan Mountains volcanic field, CO. More recent and ongoing studies examine active hydrothermal system… more
Date: November 1, 1990
Creator: Wollenberg, H. A.; Flexser, S. & Smith, A. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Status of thermal loading evaluations for a potential repository

Description: The effect that thermal loading has on the natural and engineered systems needs to be understood and demonstrated with reasonable assurance in the Viability Assessment and the License Application process for a potential underground high level waste repository at Yucca Mountain. Thermal loading can be defined in a number of ways but it basically is the amount of decay heat from the spent nuclear fuel produced per unit area and is related to the emplacement density of fuel. This paper provides an… more
Date: January 29, 1996
Creator: Saterlie, S. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Oxide vapor distribution from a high-frequency sweep e-beam system

Description: Oxide vapor distributions have been determined as a function of operating parameters of a high frequency sweep e-beam source combined with a programmable sweep controller. We will show which parameters are significant, the parameters that yield the broadest oxide deposition distribution, and the procedure used to arrive at these conclusions. A design-of-experimental strategy was used with five operating parameters: evaporation rate, sweep speed, sweep pattern (pre-programmed), phase speed (azim… more
Date: March 1, 1995
Creator: Chow, R.; Tassano, P.L. & Tsujimoto, N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A fundamental study of contribution'' transport theory and channel theory applications

Description: The objective of this three-year study is to develop a technique called channel theory'' that can be used in interpreting particle transport analysis such as frequently required in radiation shielding design and assessment. Channel theory is a technique used to provide insight into the mechanisms by which particles emitted from a source are transported through a complex system and register a response on some detector. It is based on the behavior of a pseudo particle called a contributon,'' whic… more
Date: January 1, 1992
Creator: Williams, M.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A fundamental study of ``contribution`` transport theory and channel theory applications. Progress report

Description: The objective of this three-year study is to develop a technique called ``channel theory`` that can be used in interpreting particle transport analysis such as frequently required in radiation shielding design and assessment. Channel theory is a technique used to provide insight into the mechanisms by which particles emitted from a source are transported through a complex system and register a response on some detector. It is based on the behavior of a pseudo particle called a ``contributon,`` … more
Date: December 1, 1992
Creator: Williams, M. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Examination of cadmium safety rod thermal test specimens and failure mechanism evaluation

Description: The reactor safety rods may be subjected to high temperatures due to gamma heating after the core coolant level has dropped during the ECS phase of a hypothetical LOCA event. Accordingly, an experimental cadmium safety rod testing subtask was established as part of a task to address the response of reactor core components to this accident. Companion reports describe the experiments and a structural evaluation (finite element analysis) of the safety rod. This report deals primarily with the exam… more
Date: January 1, 1992
Creator: Thomas, J. K.; Peacock, H. B. & Iyer, N. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fragmentation of condensed material by isochoric heating and release

Description: A model is suggested to describe the mechanics of fragmentation when a liquid or solid body disassembles under intense isochoric heating. The model is based on the concept that surface area created in the fragmentation process is governed by an equilibrium balance of the surface energy and a local inertial or kinetic energy. An expression is derived for the resulting fragment size as a function of the initial size, the specific energy deposited, and thermomechanical properties of the material. … more
Date: March 1, 1983
Creator: Glenn, L. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Temperature and thermal stress distributions for the HFIR permanent reflector generated by nuclear heating

Description: The beryllium permanent reflector of the High Flux Isotope Reactor has the main functions for slowing down and reflecting the neutrons and housing the experimental facilities. The reflector is heated as a result of the nuclear reaction. Heat is removed mainly by the cooling water passing through the densely distributed coolant holes along the vertical or axial direction of the reflector. The reflector neutronic distribution and its heating rate are calculated by J.C. Gehin of the Oak Ridge Nati… more
Date: April 1, 1998
Creator: Chang, S. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary reentry safety assessment of the General Purpose Heat Source module for the Cassini mission: Aerospace Nuclear Safety Program

Description: As asked by the U. S. Department of Energy/Office of Special Applications, and in support of the Environmental Impact Statement for the Cassini mission, The Johns Hopkins University/Applied Physics Laboratory (JHU/APL) has conducted preliminary one-dimensional ablation and thermal analyses of the General Purpose Heat Source (GPHS). The predicted earth entry conditions provided by the Jet Propulsion Laboratory (JPL) for a Cassini Venus-Venus-Earth-Jupiter Gravity Assist (VVEJGA) trajectory were … more
Date: April 1993
Creator: Conn, D. W. & Brenza, P. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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