You're reading: Disconnection of reactor three of Ukraine nuclear power plant has zero safety significance under INES scale

The preliminary assessment of the event associated with the disconnection of reactor three of Zaporizhia nuclear power plant NPP late on Nov. 28, 2014 has a zero safety significance under the INES (International Nuclear and Radiological Event Scale), the press service of National Nuclear Generating Company Energoatom reported on Wednesday, Dec. 3.

“A commission to investigate the event has been created,” reads a report of the State Inspectorate for Nuclear Regulation of Ukraine issued on Wednesday, Dec. 3.

The event is rated as the event without safety significance – Below Scale/Level 0.

The company said that reactor three of Zaporizhia NPP at 1924 on Nov. 28, 2014 disconnected from the power grid.

According to the preliminary data, the reason of the disconnection is the damage of winding of the transformer for own needs of the reactor. The automated reactor protection system was turned on in line with the projected algorithm.

“The reactor was switched to the cool state without remarks. There are no radiation consequences,” the company said.

“The radiation situation at the site of Zaporizhia NPP is without changes and within the requirements,” the inspectorate said.

At present power supply for own needs of the reactor is being restored. Under the repair schedule the reactor will be connected to the power grid on Dec. 5, 2014.

Energoatom is the operator of all four Ukrainian-based operating nuclear power plants, which have 15 VVER reactors with an overall generating capacity of 13.835 gigawatts.