NASA Scientific and Technical Aerospace Reports

using the four existing slurry pumps. The models and calculations were based on prototypic tank geometry and expected
normal operating conditions as defined by Waste Removal Closure (WRC) Engineering.
NTIS
Computational Fluid Dynamics; Slurries; Flow Distribution
20040120940 Savannah River Ecology Lab., Aiken, SC, USA
Weldability Comparison of Tritium-Charged-and-Aged 304 and 316LN Stainless Steel
Tosten, M. H.; Kanne, W. R.; Chapman, G. K.; West, S. L.; Cross, B. J.; May 2003; In English
Report No.(s): DE2004-812067; WSRC-TR-2003-00077; No Copyright; Avail: National Technical Information Service
(NTIS)
Measurement of the effects of helium (from tritium decay) on the weldability of Types 304 and ITER Grade 316LN
stainless steel demonstrated the inherent complexities in designing and conducting an experimental program using
tritium-charged-and-aged materials to simulate the effects of irradiation-induced helium on weld behavior. Differences in
microstructure, surface condition and alloy chemistry are known to play key roles in tritium absorption and distribution and
thus have direct effects on the subsequent He production and distribution. The helium embrittlement cracking produced in 0.5
in. (12.7 mm) thick 304 and 316LN plates that were tritium-charged in the same container and subsequently welded with gas
metal arc, low heat input weld overlays and gas tungsten arc stringer beads, varied markedly. For example, the porosity in the
weld beads was much higher in the 304 plate than in the 316LN plate. Additionally, crack measurements from weld
cross-sections revealed more extensive intergranular cracking in the heat-affected zones of welds on the 304 plate when
compared to the 316LN plate. However, the differences between the two types of stainless steel may not be a result of
differences in the resistance to helium embrittlement cracking, but may be due to initial tritium concentration differences
developed in the as charged plates. Further work is necessary to identify the reasons for the apparent plate to plate variation
in tritium/helium content and to demonstrate the similarities (or differences) between Types 304 and ITER grade 316LN
stainless steel.
NTIS
Weldability; Tritium; Stainless Steels; Arc Welding
20040120965 Du Pont de Nemours (E. I.) and Co., Aiken, SC, USA
ENDF/B Thermal Data Testing
1975; 12 pp.; In English
Report No.(s): DE2004-787923; DP-MS-75-14; No Copyright; Avail: Department of Energy Information Bridge
The thermal data testing group is concerned with establishing the merit of ENDF/B cross sections for the analysis of
thermal systems. The integral experiments used in the testing are designed to analyze each of the phenomena identified in the
familiar four-factor formula. For brevity, only the testing of the cross sections in uranium systems is described in this report.
NTIS
Cross Sections; Uranium
20040121064 College of William and Mary, Williamsburg, VA, USA
Application of Guided Acoustic Waves to Delamination Detection
Sun, Keun J.; [1991]; 7 pp.; In English; Original contains black and white illustrations; No Copyright; Avail: CASI; A02,
Hardcopy
The occurrence of delamination in laminate structures is one of the major reliability concerns for using these materials.
There are continuing needs for developing delamination inspection techniques to measure specimens of various material
structure as well as to accommodate different test environments. In the case of disbond-detection in the skin of an aircraft, for
some practical reasons, an efficient technique should be capable of inspecting a large surface area in a reasonably short amount
of time and with a high degree of accuracy. While most existing measurements can provide satisfactory accuracy, the required
high inspection rate may not be met. Thus, for assessment of large surface area with an ultrasonic technique, our approach
is to generate sound waves of particular modes, which are capable of propagating in a relatively extended area on the surface
of a plate and at meantime interrogating the structural integrity of the plate. It is well known in waveguide theory [1-3] that
certain modes of sound waves are capable of propagating a relatively long distance in a material of plate configuration, and
that their propagation properties are determined in part by the product of sound frequency and plate thickness. Recently, it was
found experimentally that, with this thickness dependence, certain modes of these plate waves provided a different approach
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