ENS Event | |
|---|---|
18:07 Aug 8, 2023 | |
| Title | 60 Day Notification for an Invalid Specified System Actuation |
| Event Description | The following information was provided by the licensee via phone and email:
This 60-day telephone notification is being made in accordance with 10 CFR 50.73(a)(1) and 10 CFR 50.73(a)(2)(iv)(A). On August 8, 2023, at 1107 hours0.0128 days <br />0.308 hours <br />0.00183 weeks <br />4.212135e-4 months <br /> pacific daylight time (PDT) with Unit 1 in Mode 1 at 100 percent power, an invalid actuation occurred when Unit 1 4-kV vital bus 'G' was automatically transferred from auxiliary power to startup power due to an invalid bus under voltage signal, which occurred during planned maintenance activities. As a result of the actuation signal, auxiliary salt water and containment fan cooling units transferred automatically and started as designed. Plant systems responded as expected. This event was entered into the Diablo Canyon Power Plant corrective action program for resolution. There was no plant or public safety impact. The NRC Senior Resident Inspector has been notified. |
| Where | |
|---|---|
Diablo Canyon  California (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1416.08 h59.003 days <br />8.429 weeks <br />1.94 months <br />) | |
| Opened: | James Morris 18:12 Oct 6, 2023 |
| NRC Officer: | Kerby Scales |
| Last Updated: | Oct 6, 2023 |
| 56781 - NRC Website
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WEEKMONTHYEARENS 567812023-08-08T18:07:0008 August 2023 18:07:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60 Day Notification for an Invalid Specified System Actuation ENS 542342019-06-27T08:30:00027 June 2019 08:30:00 10 CFR 50.73(a)(1), Submit an LER Automatic Transfer of 4-Kv Vital Bus from Auxiliary to Startup Power ENS 455852009-11-22T05:13:00022 November 2009 05:13:00 10 CFR 50.73(a)(1), Submit an LER Unexpected Automatic Start of the 2-1 Emergency Diesel Generator (Edg) ENS 436772007-10-01T02:58:0001 October 2007 02:58:00 10 CFR 50.73(a)(1), Submit an LER Unexpected Automatic Start of the 2-1 Emergency Diesel Generator (Edg) 2023-08-08T18:07:00 | |