Event title: Decrease to 45% of the the rated power of Unit 5
Event description:
On 11.09.2021 Unit 5 operated at rated power. At 04:55 one of the two turbine driven feedwater pumps (TDFWP-2) switched off due to mechanical malfunction of the regulating valve of the pump. The reactor power was reduced up to 45 % in accordance with the design protections algorithms. Activities have been undertaken to establish and eliminate the reasons for pump’s switch off, as a result of which the valve functionality was restored and at 08:25 TDFWP was switched on after the successful testing. Power increase was started in accordance with the requirements of the Technical Specifications for Safe Operation of Unit 5.
There has been no violation of the operational limits and conditions and respectively there have not been any changes in the radiological conditions.
Български
