At the spent nuclear fuel reprocessing plant in Rokkasho Village, Aomori Prefecture, it was found that there was a problem that the equipment for cooling high-level radioactive liquid waste stopped for about 8 hours on the 2nd.
Japan Nuclear Fuel Limited, the operator, has no external impact, but Aomori Prefecture is requesting investigation of the cause and reporting of recurrence prevention measures.
According to Japan Nuclear Fuel Limited, one of the tanks for storing high-level radioactive liquid waste at the reprocessing plant in Rokkasho Village, the function of the equipment for cooling the waste liquid stopped for about 8 hours from about 3:30 pm on the 2nd. It means that he was doing it.
Approximately 2600 liters of waste liquid generated during the test run was stored in the tank before, but when I noticed that the amount of cooling water was decreasing around 7 pm on the 2nd, I inspected it and circulated the water. It means that the sluice valve of the pipe to be made to be closed was closed for some reason.
Due to this trouble, the temperature of the waste liquid, which is normally kept at about 24 degrees, rose to 32 degrees at one point, but there was no external effect such as leakage of radioactive substances, so Japan Nuclear Fuel Limited was the cause. Checking it up.
In addition, regarding the announcement of this press release on the 3rd, Japan Nuclear Fuel Limited explained that it was decided that the cooling equipment would be stopped at 2:26 am on the 3rd, and that it was announced after preparations were made. increase.
In response to this trouble, Aomori Prefecture dispatched staff to the reprocessing plant and requested Japan Nuclear Fuel Limited to investigate the cause and report the recurrence prevention measures in detail.