SCRAM on Unit 6

Kozloduy NPP, 22 March 2010

Nuclear Facility: Unit 6, Kozloduy NPP
Date:21.03.2010 Time:23:03

Event Title:

Scram on Unit 6

Event description:

On 21.03.2010 Unit 6 operates on 100% of the nominal power. The equipment works in accordance with the requirements for this level of power. In 23:03 the turbine-generator No 10 disconnects from the national electric power grid due to short circuit, which led to a false signal for axial displacement of the turbine shaft. The automatic system for decreasing of the reactor power actuates as required. The fast acting steam dump system opens in accordance with the design algorithm. The pressure in steam generator No 3 drops down and the reactor SCRAM system actuates. In 23:30 the reactor was shut down in accordance with the Technical Specifications of the Unit 6.

 
INES rating of the event 0
*The final assessment by the NRA on the level of the event according to INES is announced following the receipt of the final report on the results from the investigation and the analysis of the event, according to art.12 of the Regulation for notification.

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