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Latest News
College students help develop waste-measuring device at Hanford
A partnership between Washington River Protection Solutions (WRPS) and Washington State University has resulted in the development of a device to measure radioactive and chemical tank waste at the Hanford Site. WRPS is the contractor at Hanford for the Department of Energy’s Office of Environmental Management.
M. Shim, H. Chung, S. Cho, H. Yoshida
Fusion Science and Technology | Volume 53 | Number 3 | April 2008 | Pages 830-840
Technical Paper | doi.org/10.13182/FST08-26
Articles are hosted by Taylor and Francis Online.
Quantitative assessment of a disproportionation in the ZrCo-hydrogen system under ITER-relevant operating conditions was performed by means of experimental tests and a theoretical calculation. In the static temperature experiments with equilibrium hydrogen pressures, a 10% disproportionation of ZrCoHx (x = 2.0 and 2.5) was observed in 5.5 h at 415°C (~78 kPa), 9 h at 400°C (~72 kPa), 172 h at 380°C (~51 kPa), and 1626 h at 350°C (~28 kPa). An experimental formula [log = 17 268/T (K) - 25.814, where is the reaction time (day) of 10% disproportionation] was derived from these experiments. Experiments with a temperature cycling of up to 125 cycles (from room temperature to 350 to 360°C) proved that no enhancement of a disproportionation occurs in the ZrCoHx (1.7 < x 2.0). Typical operation conditions of the ZrCo hydride bed for the D-T gas storage delivery system were proposed based on the ITER FDR 2000 plasma operation scenarios. The disproportionation rate estimated conservatively by the theoretical model indicates that a disproportionation in the ITER basic performance phase can be reduced by <4% even when there is a direct supply from the fuel storage and delivery system beds for all the D-T pulses and by <0.1% when the supply is from the hydrogen isotope separation system.