NASA Scientific and Technical Aerospace Reports

cooling cycles produced during welding of steels can be better understood and modeled.
NTIS
Nuclear Chemistry; Radiochemistry
20040120915 Lawrence Livermore National Lab., Livermore, CA
Kinetics of Solid Phase Reactions at High Pressure and Temperature
Zaug, J. M.; Farber, D. L.; Saw, C. K.; Weeks, B. L.; Feb. 11, 2002; In English
Report No.(s): DE2004-15005320; UCRL-ID-147389; No Copyright; Avail: National Technical Information Service (NTIS)
We report on the subject of temperature and/or pressure induced solid-solid phase transitions of energetic molecular
crystals. Over the last three years we have applied experimental techniques that when used simultaneously provide insight into
some of the complexities that governreaction rate processes. After more than 55 years of study a global kinetics model
describing the P-T phase space transition kinetics of such materials as HMX (octahydro-1, 3,5,7-tetranitro- 1, 3,5,7tetrazocine)is
not only missing, but from a formal perspective is perhaps as many years away from completion. The essence
of this report describes what material parameters affect first-order reaction rates of the CHNO moietyof molecular crystals and
introduces the application of new experimentaltools thus permitting quantifiable studies of important rate limiting
mechanisms.
NTIS
Phase Transformations; Reaction Kinetics; Crystals
20040120924 Westinghouse Savannah River Co., Aiken, SC, USA
Waste Tank Heel Chemical Cleaning Summary
Adu-Wusu, K.; Barnes, M. J.; Bibler, N. E.; Cantrell, J. R.; 2003; In English
Report No.(s): DE2004-820002; WSRTC-TR-2003-00401; No Copyright; Avail: National Technical Information Service
(NTIS)
The Savannah River Site (SRS) located near Aiken, SC was constructed in the 1950s to produce materials for national
defense. As a result of its mission, SRS generated a large volume of high level radioactive waste. This waste has been stored
in large capacity sub-surface waste tanks. Since construction, one tank has been emptied of waste, while two tanks have been
closed and grouted. Currently, only 48 tanks are considered to contain HLW. Of these tanks, 24 were built in the 1950s -1960s
and provide only single containment and are the focus of this report. The wastes are being removed from the tanks and
processed for eventual disposal in appropriate repositories. Waste stored in these tanks are classified as supernate, salt (formed
from evaporated supernate), or sludge. The focus of this study is the review of chemical treatments which can be used to
dissolve the sludge heel. This document provides a review of the most relevant chemically aided attacks on sludge material
as well as a review of the chemistry and properties associated with such an endeavor.
NTIS
Chemical Cleaning; Containment; Dissolving; Radioactive Wastes
20040120938 Savannah River Ecology Lab., Aiken, SC, USA
Sludge Batch 3 Simulant Flowsheet Studies: Phase II SRAT/SME Results
Herman, C. C.; Koopman, D. C.; Best, D. R.; Williams, M. F.; Apr. 25, 2003; In English
Report No.(s): DE2004-811939; WSRC-TR-2003-00158; No Copyright; Avail: National Technical Information Service
(NTIS)
The Savannah River Technology Center (SRTC) - Immobilization Technology Section (ITS) was requested to perform
simulant bench-scale flowsheet studies to qualify Sludge Batch 3 (SB3), the next sludge batch to be processed at the Defense
Waste Processing Facility (DWPF). Simulant flowsheet runs have been performed for every sludge batch that has been
qualified for DWPF processing to date. SB3 will consist primarily of Tank 7 sludge, but will also contain transfers from other
tanks and processes at the SRS and other materials not considered typical for DWPF processing. Projections also indicate that
SB3 may contain higher than previously observed levels of noble metals. Over the last year, SRTC has focused significant
effort on studies to understand the behavior of SB3 and to evaluate any necessary process changes.
NTIS
Sludge; Grasslands; Immobilization
20040121080 NASA Marshall Space Flight Center, Huntsville, AL, USA
The Conservation of Structure and Mechanism of Catalytic Action in a Family of Thiamin Pyrophosphate
(TPP)-dependent Enzymes
Dominiak, P.; Ciszak, Ewa; [2004]; 1 pp.; In English; No Copyright; Avail: Other Sources; Abstract Only
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