Takahama Nuclear Steam Generator “Shaving” Caused by a small piece of metal December 19, 16:11
At Takahama Nuclear Power Station Unit 4 in Fukui Prefecture, the thin pipes for steam generating equipment = 5 narrow pipes were cut by up to 60% at most. Power summarized. The NRA requested that the necessary measures be taken.
At Takahama Nuclear Power Station Unit 4, during regular inspections, in September, it was found that a total of 5 capillaries were cut by a maximum of 60% with 3 steam generators that moved the turbine.
On this day, Kansai Electric Power had a regular inspection with the Nuclear Regulatory Commission on the 19th, and it was 18 to 24 mm in length, 6 to 8 mm in width, 1 mm in thickness attached to workers' clothes, etc. It was reported that a small piece of metal of less than millimeters was mixed into the equipment and damaged the capillaries from the outside.
In addition, as a preventive measure, workers decided to change clothes and cover shoes before inspection.
On the other hand, the NRA has not found any metal fragments, but the cause analysis of Kansai Electric Power is appropriate, and it is not only left to subcontracting. I asked them to take action as needed.