Violation of OL&C in the Interim Spent Fuel Storage Facility at Paks

Print View Posted on: 17 February 2021

Event Date: 11 February 2021 Event Type: Other
Event Location: Hungary, Paks INES Rating: 1 (Final)

On the 11th of February 2021, the on duty operator realized that according to the Nitrogen Monitoring system, the pressure of the monitoring space no. 18/7 has decreased to 800 mbar (however it still has not reached the value described in OL&C). After consulting leaders it has been decided to refill the monitoring space no. 18/7. The operator refilled the monitoring space no. 18/7 using the nitrogen charge tool and trolley. The trolley’s certificated pressure gauge indicated 2.8 bar pressure at the beginning of the refill. This was the 5th refill of the monitoring space no 18/7.
The number of refilling of the monitoring spaces is limited by the OL&C. Before staring the fifth refilling some measures had to be taken according to the OL&C, which were not taken into account by the staff.

INES Rating: 1 - Anomaly (Final) as per 16 February 2021
Release beyond authorized limits? No
Overexposure of a member of the public? No
Overexposure of a worker? No

Contamination spread within the facility? No
Damage to radiological barriers (incl. fuel damage) within the facility? No

Degradation of Defence In-Depth Yes

Person injured physically or casualty? No
Is there a continuing problem? Yes

Robert Nagy
Interim Spent Fuel Storage Facility
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