2 août 2016
Les opérateurs de Byron ont découvert cette porte ouverte et sans surveillance. Elle a été fermé dans les 5 minutes qui ont suivi sa découverte. Cette porte oubliée ouverte était susceptible d’empêcher le fonctionnement des groupes diesels et de rendre donc impossible l’accomplissement d’une fonction de sécurité pour atténuer les conséquences d’un accident.
Type : PWR - Puissance : 3 586 MWth - Première divergence : 02 / 1985
Available in english only
Event Number : 52148
Facility : BYRON - State : IL
Unit : [1] - RX Type : [1] W-4-LP
Event Date : 08/02/2016 - Event Time : 09:34 [CDT]
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Initial PWR : 100 % Current PWR : 100 %
Event Text
WATERTIGHT DOOR DISCOVERED OPEN AND UNATTENDED
"On August 2, 2016 at 0934 CDT, Byron Operators entered and exited 1BOL 8.1 Conditions B and F for the 1A and 1B Diesel Generators due to 0DSSD192 (1B DOST Watertight Door) being discovered open and unattended. 0DSSD192 was closed within 5 minutes of discovery.
"0DSSD192 protects the DOST [diesel oil storage tank] transfer pumps from the effects of a postulated failure of a Circulating Water expansion joint at the condenser waterboxes in the Turbine Building. An open watertight door associated with one DOST has the potential of making both Diesel Generators inoperable.
"This event is reportable per 10 CFR 50.72(b)(3)(v)(D) for any event or condition that could have prevented fulfillment of a safety function of structures or systems that are needed to mitigate the consequences of an accident.
"The licensee has notified the NRC Resident Inspector."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2016/20160803en.html
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