Potential uncontrolled access to room with radiation greater than 1000 mR / hr

Print View Posted on: 26 November 2019

Event Date: 16 November 2019 Event Type: Power Reactor
Event Location: Mexico, LAGUNA VERDE-1 INES Rating: 2 (Provisional)

On November 16, 2019, Laguna Verde NPP Unit 1 was increasing power from 65% after performing maintenance activities on one turbine stop valve. At 17:15 hrs. the physical security guard informed that the door to access the room TB-313 was closed but not correctly secured by its padlock. The room TB-313 is an area with radiation greater than 1000 mR/h. The event duration was 1:35 hrs.
According to the investigation performed by radiation protection personnel, nobody accessed the room TB-313 while the condition lasted.

INES Rating: 2 - Incident (Provisional) as per 19 November 2019
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? No

Victor Gonzalez
Comision Nacional de Seguridad Nuclear y Salvaguardias

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