Performance of various hydrophobic coatings to reduce HTO contamination

• Published in: Journal of nuclear materials Vol. 417; no. 1-3; pp. 1187 - 1190
• Main Authors: Iwai, Yasunori, Kobayashi, Kazuhiro, Yamanishi, Toshihiko
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2011; Elsevier
• Subjects: Applied sciences; Controled nuclear fusion plants; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fission nuclear power plants; Fuels; Installations for energy generation and conversion: thermal and electrical energy; Nuclear fuels; Nuclear fusion reactor; Vapor pressure; Lixiviation; Tritium; Concrete; Leaching; Protective coatings; Contamination; Nuclear reactor
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/j.jnucmat.2010.12.298

Several kinds of hydrophobic coatings were tested on concrete and epoxy samples. These samples were exposed to 740–1110Bq/cm3 of HTO vapor at 1kPa pressure at 288–298K for 1–60weeks. Static leaching tests on HTO absorbed samples were conducted in distilled water, and the leaching was evaluated as a function of time. Most coatings on concrete only slowed the HTO sorbed rate. Chemical modification of hydroxyl bonds on the concrete surface by methoxytrimethylsilane in contrast led to the decrease in the amount of HTO sorbed. Most coatings on epoxy led to the decrease in the amount of HTO sorbed. Especially, epoxy with fluoric coating, adhesive sheet of SUS 304 or aluminum brought the largest retardation of tritium sorbing.