18 août 2014
Le système à pression négative ne fonctionnait pas suite au problème de verrouillage de cette porte. Dix minutes après sa survenue, le problème était déclaré résolu. Deux jours plus tard, le verrouillage de la porte ne fonctionnait toujours pas. En attendant sa réparation définitive, le système a été bricolé pour permettre le verrouillage et assurer la fonction de ventilation d’urgence. La porte n’est plus utilisée que pour les activités essentielles.
Type : PWR - Puissance : 2 817 MWth - Première divergence : 08/1977
Available in english only.
Event Number : 50381
Facility : DAVIS BESSE - State : OH - Unit : [1] - RX Type : [1] B&W-R-LP
Event Date : 08/18/2014 - Event Time : 19:25
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR : 100 % Current PWR - 100 %
Event Text
SHIELD BUILDING BOUNDARY DOOR FAILED TO LATCH
"At 1925 EDT on 08/18/2014 an equipment failure prevented a boundary door to the Shield Building Negative Pressure Area to latch closed upon egress, thereby preventing fulfillment of the Station Emergency Ventilation System safety function. Necessary door repairs per normal station practices were completed at 1935 EDT to establish full safety system function.
"This event was previously considered not reportable. Subsequent review determined the event reportable. The NRC Resident has been notified of the event. The failure to meet the 8-hour reporting requirement has been entered into the Corrective Action Program."
The licensee will notify the State, Ottawa, and Lucas counties
* * * UPDATE FROM THOMAS COBBLEDICK TO JOHN SHOEMAKER AT 1027 EDT ON 8/20/14 * * *
"At approximately 0413 [EDT] on 8/20/14, the boundary door to the Shield Building Negative Pressure Area again failed to latch closed upon egress. The door was able to be closed and latched at 0419, restoring the Station Emergency Ventilation System safety function. Door use will be limited to essential activities until final repairs to the door closure and latching mechanism are complete. The NRC Resident has been notified of the event."
The licensee will notify the State of Ohio and local authorities.
Notified R3DO (Passehl).
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140821en.html#en50381