Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.2172/709770 |
| 报告编号 | ORNL/TM--6429 |
| 来源ID | OSTI_ID: 709770 |
| Alternate Fuel Cycle Technologies/Thorium Fuel Cycle Technology Programs. Quarterly report for period 1 April--30 June 1978 | |
| Vondra, B.L. | |
| 英文摘要 | Voloxidation and dissolution studies: rotary-kiln heat-transfer tests are under way using a small rotary kiln along with the development of a mathematical model to determine kiln-heat-flux profiles necessary to maintain a desired temperature gradient. The erosion/corrosion test for evaluating materials of construction is operational. Fuel from a BWR (Big Rock Point) yielded more fine solid residue on dissolution than in previous tests with PWR fuel. Two additional parametric voloxidation tests with H.B. Robinson fuel compared air vs pure oxygen atmospheres at 550{sup 0}C; overall tritium release and subsequent fuel dissolution were equivalent. Thorium dissolution studies: the dissolution rate of thoria in fluoride-catalyzed 8 to 14 M HNO{sub 3} (100{sup 0}C) was max between 0.04 to 0.06 M HF; at higher fluoride concentrations, ThF{sub 4}.5H{sub 2}O precipitated. The rate of zircaloy dissolution continued to increase with increasing fluoride concentration. Stainless-steel-clad (Th,U)0{sub 2} fuel rods irradiated in the NRX reactor were sheared, voloxidized, and dissolved. {le}10% of the tritium was released during voloxidation in air at 600{sup 0}C. Carbon-14 removal from off-gas and fixation: carbon dioxide removal with Linde 13X molecular sieves to less than 100 ppB was experimentally verified using 300 ppM CO in air. Decontamination factors from 3000 to 7500 were obtained for CO{sub 2} removal in the gas-slurry stirred-tank reactor with CA(OH){sub 2}.or Ba(0H){sub 2}/sup .8H2O./. With Ba(OH){sub 2}.H{sub 2}0{sup 2} in a fixed-bed column, decontamination factors of about 30,000 were obtained. |
| 出版年 | 1978 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 05 ; VOLOXIDATION PROCESS ; RESEARCH PROGRAMS ; THORIUM OXIDES ; DISSOLUTION ; ZIRCALOY 4 ; FUEL CYCLE ; CARBON DIOXIDE ; REMOVAL ; CARBON 14 ; KRYPTON 85 ; THORIUM ; SOLVENT EXTRACTION ; URANIUM ; NITRIC ACID ; HYDROFLUORIC ACID ; OFF-GAS SYSTEMS ; AIR ; CALCIUM HYDROXIDES ; BARIUM HYDROXIDES ; ADSORPTION ; RUTHENIUM ; EXTRACTION APPARATUSES ; TBP ; ENVIRONMENTAL IMPACTS |
| URL | http://www.osti.gov/scitech/servlets/purl/709770 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/262120 |
| 推荐引用方式 GB/T 7714 | Vondra, B.L.. Alternate Fuel Cycle Technologies/Thorium Fuel Cycle Technology Programs. Quarterly report for period 1 April--30 June 1978,1978. |
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