On 28 December 2014 at 05:59 unit №6 of Zaporizhzhya NPP was disconnected from power grid due to actuated house load transformer protections*. The automation and personnel lowered the reactor capacity to 10% of rated power.
The investigations revealed the false actuation of transformer protection system.
On the same date, 28 December 2014 at 22:35, unit № 6 of Zaporizhzhya NPP was reconnected to the power grid.
The radiation situation at Zaporizhzhya NPP site and beyond it hasn’t changed and remains within the set limits. The physical protection is maintained in normal mode.
Daily information on the status of Ukrainian NPPs and on-site radiation conditions is provided on the site of the State Nuclear Regulatory Inspectorate of Ukraine via the following link.
* For reference. House load transformer is designed in particular to provide power supply of reactor unit in case of turbine generator failure.