ENS 52148
ENS Event | |
|---|---|
14:34 Aug 2, 2016 | |
| Title | Watertight Door Discovered Open and Unattended |
| Event Description | 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.
The purpose of this report is to retract a previous report made on August 2, 2016 at 1755 EDT (EN 52148). Notification of the event to the NRC was initially made for a condition where the station determined that an open watertight door associated with one DOST [Diesel Oil Storage Tank] had the potential to make both Diesel Generators inoperable, and the condition was reported under 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. Upon further investigation, Byron Station has concluded that the 1A Diesel Generator was never inoperable, and therefore, no loss of safety function occurred. Based on this, the prior ENS notification is being retracted. The NRC Senior Resident Inspector has been notified. Notified R3DO (Dickson). |
| Where | |
|---|---|
Byron  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+3.35 h0.14 days <br />0.0199 weeks <br />0.00459 months <br />) | |
| Opened: | Pat Comerford 17:55 Aug 2, 2016 |
| NRC Officer: | Daniel Mills |
| Last Updated: | Aug 29, 2016 |
| 52148 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |