Date

Events

Ref.

22.12.21

ZNPP worked with maximum power 6.14GW, all units worked correctly.

[11]

04.03.22

Unit 1 was shut down for maintenance; unit 2 and 3 had undergone a controlled shut down; unit 4 was operating at 60% power; units 5 and 6 were being held “in reserve” in low power mode.

[6]

05.08.22

Shutdown of electrical power transformer and two backup transformers.

Reactor unit 4 was affected, the emergency protection system of this unit was triggered, diesel generators were set in operation to ensure the power supply for this unit. This unit was shut down.

[7]

[12]

07.08.22

A 750 kV high voltage line was shut down as a result of this round of shelling.

The emergency protection system of reactor Unit was triggered.

[7]

10.08.22

Restoration of a power line that could be used to supply the ZNPP with electricity from the nearby thermal power plant if needed.

[7]

13.08.22

Damage of 750 kV switchyard.

[13]

22.08.22

Damage in transformers of the nearby thermal power plant causing a disconnection of the power line linking this power plant to ZNPP.

[7]

25.08.22

ZNPP lost the power provided by its last remaining operational 750kV external power line. ZNPP’s operating reactor units had been disconnected from the electricity grid and their emergency protection systems triggered, while all safety systems remained operational.

[7]

26.08.22

Units 5 and 6 are disconnected from the grid at 09:00 (MSK), and between 14:04-21:15 ZNPP staff began connecting these units to the grid.

[14]

03.09.22

ZNPP-Dniprovska last 750 kV power line was unavailable, spare line was used. Units 5 and 6 were reduced to 500 MW power level.

[7]

[15]

05.09.22

750 kV ZNPP-Dniprovska, 330 kV ZTPP-Kakhovska and 330 kV ZTPP-Melitopol power transmission lines were damaged and disconnected. The ZNPP 750/330 kV autotransformer (AT) was also damaged.

Unit 6 was disconnected from the grid for in-house needs.

[14]

08.09.22 - 10.09.22

Unit 5 was shutdown. Unit 6 has been operating at critically low-capacity level 114 - 140 MW (11% - 14%).

[14]

[16]

11.09.22

Shutdown of all reactor units.

[14]

21.09.22

High voltage external power transmission line was damaged. Autotransformer was also damaged. 2 diesel generators emergency started operating.

[17]

06.10.22

Damage of 150 kV power line providing electricity via the switchyard of a nearby thermal power station to ZNPP unit 6.

[4]

08.10.22

At 00:59 am, ZNPP lost access to external power following shelling.

[4]

09.10.22

Maintenance of 750kV ZNPP-Dniprovskahigh transmission line.

[14]

12.10.22

ZNPP lost external power for a few hours following damage to a substation located far from the plant itself.

[4]

02.11.22

The last two high-voltage transmission lines were damaged, all diesel generators started operating, the power supply scheme for ZNPP’s in-house needs is optimized, 9 diesel generators are left in operation. Units 5 and 6 are being transferred to a cold shutdown mode.

[14]