塩化ビニールテープ起因応力腐食割れ事象の原因分析およびテープの変成挙動調査
2004 年 53 巻 2 号 p. 129-135
詳細
2004 年 53 巻 2 号 p. 129-135
In October 2000, the 24 years old Ikata-1 PWR-type nuclear power plant suffered cracking in pipes, where poly vinyl chloride (PVC) tape had been placed and had become baked over time. The existence of residual stress over 100MPa in the pipes, a bit of chlorine and a feather like-pattern on the crack faces suggested the event was one of stress corrosion cracking.
Engineers of Shikoku Electric Power Co. groups examined experimentally the production of chloride from PVC tape on a steel, and elucidated the temperature depending production peaks is induced by the properties of FeCl3, the principal ingredient of the chloride. Semi-quantitative expression of the production of soluble chlorine was proposed.
In next report, authors will elucidate the stress corrosion cracking in steels with baked PVC tape and the cracking potential in pipes with the fluid of various temperatures and various duration.
