ENS 49239
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ENS Event | |
|---|---|
18:56 Aug 5, 2013 | |
| Title | Both Offsite Power Sources Inoperable During Undervoltage Testing |
| Event Description | Both Limerick 4 KV offsite sources were inoperable and Technical Specification 3.0.3 was entered for Unit 2 from 1456 to 1512 [EDT] during D23 4KV Undervoltage testing. During the undervoltage test, the affected diesel and one offsite source (101 Bus) are inoperable. During the test, the alternate offsite source (201 Bus) UV relay was tested and found to be inoperable, resulting in the need to declare the second offsite source (201 Bus) inoperable.
When notified of the failure, action was taken to restore the 101 Bus offsite source to operable and exit the 3.0.3 condition [at] (1512 EDT). The 201 Bus Relay was successfully calibrated and tested to subsequently restore the 201 Bus to operability [at] (1543 EDT). Testing of the 201 bus UV relay is directed per procedure while the 101 bus is powered from the diesel generator. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
| Limerick Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+2.7 h0.113 days <br />0.0161 weeks <br />0.0037 months <br />) | |
| Opened: | Dan Williamson 21:38 Aug 5, 2013 |
| NRC Officer: | Pete Snyder |
| Last Updated: | Aug 5, 2013 |
| 49239 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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