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Remote disassembly of irradiated tritium-bearing lithium-bonded capsules

Description: Seven irradiated tritium-bearing lithium-bonded capsules containing vanadium alloy specimens were disassembled in a hot-cell facility at Argonne National Laboratory. These capsules were irradiated in the Fast Flux Test Facility as part of the structural materials research for the Fusion Power Program. The principal concern in disassembling these capsules to retrieve the test specimens was the hazard associated with the residual bonded tritium, which ranged from {approximately}17 to 99 Ci per capsule. This tritium had to be contained to the maximum extent possible. An enclosed system was built in which the authors used liquid ammonia to dissolve the lithium bond, alcohol to rinse and clean the retrieved specimens, and chemical getters (containing a reactive metal alloy) to trap the released tritium gas. The main processing units of the system are inside a hot cell and the remainder are in a vented cabinet. Essentially all of the tritium in the capsules was either trapped in the getters or confined in the solid reaction residues in beakers of spent ammonia and alcohol. There was no personnel contamination or accidental tritium release during the entire procedure.
Date: September 1994
Creator: Tsai, H.; Strain, R. V.; Donahue, D. A.; Savoie, F. E.; Evans, D. A. & Neimark, L. A.
Partner: UNT Libraries Government Documents Department

Quality assurance/quality control summary report on phase 2 of the Clinch River remedial investigation at the Oak Ridge Reservation, Oak Ridge, Tennessee

Description: Quality assurance (QA) objectives for Phase 2 were that (1) scientific data generated would withstand scientific and legal scrutiny; (2) data would be gathered using appropriate procedures for sample collection, sample handling and security, chain of custody, laboratory analyses, and data reporting; (3) data would be of known precision and accuracy; and (4) data would meet data quality objectives defined in the Phase 2 Sampling and Analysis Plan. A review of the QA systems and quality control (QC) data associated with the Phase 2 investigation is presented to evaluate whether the data were of sufficient quality to satisfy Phase 2 objectives. The data quality indicators of precision, accuracy, representativeness, comparability, completeness, and sensitivity were evaluated to determine any limitations associated with the data. Data were flagged with qualifiers that were associated with appropriate reason codes and documentation relating the qualifiers to the reviewer of the data. These qualifiers were then consolidated into an overall final qualifier to represent the quality of the data to the end user. In summary, reproducible, precise, and accurate measurements consistent with CRRI objectives and the limitations of the sampling and analytical procedures used were obtained for the data collected in support of the Phase 2 Remedial Investigation.
Date: December 1, 1996
Creator: Holladay, S.K.; Anderson, H.M.; Benson, S.B.; Bevelhimer, M.S.; Brandt, C.C.; Chavannes, C.M. et al.
Partner: UNT Libraries Government Documents Department

Capattery double layer capacitor life performance

Description: Double layer capacitors (DLCs) have received increased use in computer memory backup applications for consumer products during the past ten years. Their extraordinarily high capacitance density along with their maintenance-free operation makes them particularly suited for these products. These same features also make DLCs very attractive in military type applications. Unfortunately, lifetime performance data has not been reported in the literature for any DLC component. Our objective in this study was to investigate the effects that voltage and temperature have on the properties and performance of single and series-connected DLCs as a function of time. Evans model RE110474, 0.47-farad, 11.0-volt Capatteries were evaluated. These components have a tantalum package, use welded construction, and contain a glass-to-metal seal, all incorporated to circumvent the typical DLC failure modes of electrolyte loss and container corrosion. A five-level, two-factor Central Composite Design'' was used in the study. Single and series-connected Capatteries rated at 85{degree}C, 11.0-volts operation were subjected to test temperatures between 25 and 95{degree}C, and voltages between 0 and 12.9 volts (9 test conditions). Measured responses included capacitance, equivalent series resistance, and discharge time. Data were analyzed using a regression analysis to obtain response functions relating DLC properties to their voltage, temperature, and test time history. These results are described and should aid system and component engineers in using DLCs in critical applications.
Date: January 1, 1991
Creator: Evans, D.A. (Evans Co., East Providence, RI (USA)); Clark, N.H.; Baca, W.E. (Sandia National Labs., Albuquerque, NM (USA)); Miller, J.R. (Miller (John R.), Shaker Heights, OH (USA)) & Barker, T.B. (Rochester Inst. of Tech., NY (USA). Coll. of Engineering)
Partner: UNT Libraries Government Documents Department