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Unavailability of Reactor protection system of unit 3

Print View Posted on: 18 October 2024

Event Date: 11 January 2024 Event Type: Power Reactor Event Location: Czech Republic, DUKOVANY-3 INES Rating: 2 (Final)

Dukovany NPP is equipped by a digital Control and Protection system of Reactor.
On January 11, 2024 Unit 3 of Dukovany NPP was a few days before refuelling outage, on stable operation on Power and Temperature effect with actual power 97 % Nnom, operation was in accordance with manuals. Routine testing of PPR Tester was planned.

At 08:35 after connecting of the PPR Tester into division 3 of the reactor protection system a faulty connection was signalled and the test did not start. The personnel reconnected the PPR Tester and after that Error A1 was signalled.
At the same time, the data in the safety network SN 3 become invalid. Subsequently all process units connected to this network (= whole division 3 of reactor protection system, including information subsystem) became invalid and stopped work. Investigation of event revealed, due to human errors and inner fault of the PPR tester a test data was transmitted into division 3 of the Reactor

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