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Title: Analysis of Flash Diffusivity Experiments Performed on Semi-porous Materials


No abstract prepared.

 [1];  [2];  [1]
  1. ORNL
  2. Virginia Military Institute, Lexington
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
DOE Contract Number:
Resource Type:
Country of Publication:
United States

Citation Formats

Dinwiddie, Ralph Barton, McMasters, Robert L, and Porter, Wallace D. Analysis of Flash Diffusivity Experiments Performed on Semi-porous Materials. United States: N. p., 2006. Web.
Dinwiddie, Ralph Barton, McMasters, Robert L, & Porter, Wallace D. Analysis of Flash Diffusivity Experiments Performed on Semi-porous Materials. United States.
Dinwiddie, Ralph Barton, McMasters, Robert L, and Porter, Wallace D. Sun . "Analysis of Flash Diffusivity Experiments Performed on Semi-porous Materials". United States. doi:.
title = {Analysis of Flash Diffusivity Experiments Performed on Semi-porous Materials},
author = {Dinwiddie, Ralph Barton and McMasters, Robert L and Porter, Wallace D},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}

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  • New methods, based on nonlinear least squares techniques, are presented for reducing flash diffusivity data obtained on layered composite samples. Analytical solutions to the transient heat conduction equation are derived by the Laplace transform technique for the cases of two and three layer samples with interfacial thermal resistance between the layers and thermal losses at the external boundaries. The use of the analytical solutions in least squares fitting programs is then discussed, with emphasis on the two layer problem. A description of FORTRAN computer programs which implement the calculations is given, with emphasis on the non-linear least squares fitting routinemore » LSTSQRSL3. This program can determine the external boundary thermal loss factor and either the thermal diffusivity of one of the layers or the interfacial resistance between the layers. Two examples of the use of this program are given. In the first, the thermal diffusivity of an alumina layer in a graphite-alumina sample is determined, and in the second, the diffusivity of an enamel paint on a stainless steel substrate is determined. 34 refs., 12 figs., 2 tabs.« less
  • This paper documents the extensive amount of experimental work on radiation damage to reactor vessel materials carried out by Yankee Atomic Electric Company (YAEC) and others in support of a licensing effort to restart the Yankee Rowe nuclear power plant. The effect of plate nickel content and microstructure on irradiation damage sensitivity was assessed. Typical reactor pressure vessel plate materials each containing 0.24% (by weight) copper, but different nickel contents at 0.19% and 0.63% were heat treated to produce different microstructures. A Linde 80 weld containing 0.30% copper and 1.00% nickel was produced and heat treated to test microstructure effectsmore » on the irradiation response of weld metal. Materials taken from plate surface locations (vs 1/4%) were included to test whether or not the improved toughness properties of the plate surface layer, resulting from a rapid quench, is maintained after irradiation. Irradiations were conducted at two irradiation temperatures, 500 F (260 C) and 550 F (288 C), to determine the effect of irradiation temperature on embrittlement. The results of this irradiation testing and additional data from a DOE/Sandia National Laboratories irradiation study show an irradiation temperature effect that is not consistent, but varies with the materials tested. The test results demonstrate that for nickel bearing steels, the superior toughness of plate surface material is maintained even after irradiation to high fluences, and for the copper content tested, nickel has little effect on irradiation response. A mixed effect of microstructure/heat treatment on the materials` irradiation response was noted. Phosphorus potentially played a role in the irradiation response of the low nickel material irradiated at 500 F (288 C) but did not show prominence in the irradiations for the same material conducted at 500 F (260 C).« less
  • The movement of water and gas through plastic clay is an important subject in the research at SCK-CEN on the possible disposal of high level radioactive waste in the Boom clay layer at Mol. Since the construction of the Hades underground research facility in 1983, SCK-CEN has developed and installed numerous piezometers for the geohydrologic characterization and for in situ radionuclide migration experiments. In situ gas and water injection experiments have been performed at two different locations in the underground laboratory. The first location is a multi filter piezometer installed vertically at the bottom of the shaft in 1986. Themore » second location is a three dimensional configuration of four horizontal multi piezometers installed from the gallery. This piezometer configuration was designed for the MEGAS (Modelling and Experiments on GAS migration through argillaceous rocks) project and installed in 1992. It contains 29 filters at distances between 10 m and 15 m from the gallery in the clay. Gas injection experiments show that gas breakthrough occurs at a gas overpressure of about 0.6 MPa. The breakthrough occurs by the creation of gas pathways along the direction of lowest resistance i.e. the zone of low effective stress resulting from the drilling of the borehole. The water injections performed in a filter -- not used for gas injection -- show that the flow of water is also influenced by the mechanical stress conditions. Low effective stress leads to higher hydraulic conductivity. However, water overpressures up to 1.3 MPa did not cause hydrofracturing. Water injections performed in a filter previously used for gas injections, show that the occluded gas hinders the water flow and reduces the hydraulic conductivity by a factor two.« less
  • This standard practice covers a procedure for determining absorbed dose vs. depth in materials exposed to the x-ray output of flash x-ray machines. It is applicable to all machines whose photon energy spectra are of 100 keV to 20 MeV. The described determination provides information related to the photon spectrum from the flash x-ray machine.