ENS 41575
ENS Event | |
|---|---|
01:28 Apr 8, 2005 | |
| Title | Potential Inability to Safe Shutdown Due to Inoperable Emergency Diesel Generators |
| Event Description | The following information was provided by the licensee (licensee text in quotes):
All three divisions of Emergency Diesel Generators were declared inoperable due to performing at risk design changes on the operable diesel. The design change was removed from the division one diesel and it was declared available at 2045 on 4/7/05. All three diesels remain inoperable. Perry 1 is currently shutdown in refueling mode 5 and no core alterations are in progress. The licensee will notify the NRC Resident Inspector.
Update to Event Notification (ENF 41575) Retraction: An 8-hour notification was made on April 7, 2005 under 10CFR50.72(b)(3)(v) for the loss of the safety function. The report was made due to declaring division 1 diesel generator inoperable at 2028 hours0.0235 days <br />0.563 hours <br />0.00335 weeks <br />7.71654e-4 months <br /> on April 7, 2005 with Division 2 and 3 inoperable for unrelated refuel outage activities. Division 1 diesel generator was declared inoperable as a result of performing an at-risk design change on the exhaust system, i.e., installing insulation blankets on the exhaust piping. The at-risk design change was removed from the division one diesel generator by 2045 hours0.0237 days <br />0.568 hours <br />0.00338 weeks <br />7.781225e-4 months <br /> on April 7, 2005. No other actions were taken during the course of events that would have otherwise rendered the Division 1 diesel generator inoperable. An evaluation was completed on April 8, 2005 confirming that the additional weight of the insulation on the exhaust piping had no impact on diesel generator operability. Division 1 diesel generator was subsequently declared operable at 0534 hours0.00618 days <br />0.148 hours <br />8.829365e-4 weeks <br />2.03187e-4 months <br /> on April 9, 2005. Since there was no loss of safety function, there is no reportable condition. Since there was no reportable condition. ENF 41575 is retracted. The licensee has notified the NRC Resident Inspector. Headquarters Operations Officer notified R3DO (Hills). |
| Where | |
|---|---|
Perry  Ohio (NRC Region 3) | |
| 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:+4.07 h0.17 days <br />0.0242 weeks <br />0.00558 months <br />) | |
| Opened: | Michael Nemcek 05:32 Apr 8, 2005 |
| NRC Officer: | Arlon Costa |
| Last Updated: | Apr 24, 2005 |
| 41575 - NRC Website | |