ENS 41799
ENS Event | |
|---|---|
14:55 Jun 26, 2005 | |
| Title | Emergency Diesel Generators Inoperable Due to High Ambient Temperature |
| Event Description | The report is being made in accordance with 10 CFR 50.72(b)(3) due to both Emergency Diesel Generators (EDGs) being declared inoperable. [This is a 24-hour LCO.] The EDGs were declared inoperable due to indicated outside air temperature exceeding the established operability limit of 95F for two short periods of time. Indicated outside air temperature went above 95F during the following time frames: 10:55 to 11:00 and 12:15 to 12:20. Indicated outside air temperature subsequently decreased to less than 95F following these spikes. Both EDGs are currently operable. Outside ambient temperatures are continuing to be monitored. Offsite power is available.
Further evaluation of this event is ongoing. The licensee notified the NRC Resident Inspector.
The initial report was made in accordance with 10 CFR 50.72(b)(3) due to both Emergency Diesel Generators (EDGs) being declared inoperable. The EDGs were declared inoperable due to indicated outside air temperature exceeding the established operability limit of 95F for short periods of time on 6/26/05. Outside indicated air temperature subsequently decreased to less than 95F following these short timeframes. Both EDGs were operable when the notification was made, and outside ambient temperatures continued to be monitored. Offsite power was available. Further evaluation of this event has been performed. The initial report used temperature indication that was conservative with respect to actual conditions. The evaluation determined that the air temperature outside the EDG Building was a maximum of 91 F on 6/26105. This evaluation was based on other temperature reading taken during the periods of interest. Additionally, further evaluation has determined that both EDGs were not inoperable even at the higher temperatures initially indicated. Therefore, the EDGs were not inoperable during the periods reported and event notification#41799 is retracted. Notified the R1DO (Caruso). The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
| Pilgrim Massachusetts (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+0.58 h0.0242 days <br />0.00345 weeks <br />7.94484e-4 months <br />) | |
| Opened: | Mike Mcdonnell 15:30 Jun 26, 2005 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Aug 12, 2005 |
| 41799 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |