美浜3号機二次系配管破損事故と今後の対応
Lesson learned from secondary pipe rupture at Mihama Unit 3 and our future strategy
著者:
伊藤 肇 Hajime ITO
発刊日:
公開日:
erosion / corrosionnuclear power plantsecondary system
概要
Abstract: The secondary system pipe rupture occurred on August 9,2004, at Mihama nuclear power plant unit 3. Eleven workers, who were preparing for an annual outage that was to start from August 14th, suffered burn injuries, of who five died. We sincerely and deeply apologized to the victims and their families. We will make every possible effort to ensure that such an accident will never happen again. It is estimated that the disturbed flow of water, downstream of the orifice, caused erosion / corrosion and developed wall thinning, leading to a rupture at the thinnest section. We conducted visualization test of flow condition, to compare the result of test and the actual condition of wall thinning at the concerned area . It resulted in confirming our estimate right.
