ENS 50666
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ENS Event | |
|---|---|
18:44 Dec 10, 2014 | |
| Title | Inadvertent Loss Of Vital Indication During Maintenance |
| Event Description | On December 10, 2014, at 1344 [EST], channel 1 of Refueling Water Storage Tank (RWST) level indication failed low during maintenance activities on channel 2. At that time, operators entered abnormal procedure 1-AP-3, 'Loss of Vital Indication, on Unit 1.' Additionally, Technical Specification (TS) 3.0.3 was entered due to 2 channels inoperable that affect Recirculation Spray (RS) pump auto-start capability. Had a Containment Depressurization Actuation (CDA) occurred during the time that both channels were inoperable, accident mitigation would have been adversely impacted. At 1356, both level indications returned to normal. At 1417, channel 2 was declared Operable and TS 3.0.3 was cleared. At 1439, channel 1 was declared Operable.
Therefore, this 8-hour report is being made per 10 CFR 50.72(b)(3)(v)(D) as an event or condition that could have prevented fulfillment of a safety function due to the RS pump auto-start concern. Technicians inadvertently went to the incorrect channel (Channel 1) during planned maintenance activity of Channel 2, causing the loss of both channels simultaneously for a short period of time. The licensee has notified the NRC Resident Inspector and will be notifying the Louisa County Administrator. |
| Where | |
|---|---|
North Anna  Virginia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-1.52 h-0.0633 days <br />-0.00905 weeks <br />-0.00208 months <br />) | |
| Opened: | Bob Page 17:13 Dec 10, 2014 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Dec 10, 2014 |
| 50666 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
North Anna with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
WEEKMONTHYEARENS 514602015-10-08T01:47:0008 October 2015 01:47:00
[Table view]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, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition High Energy Line Break Door Found Unlatched ENS 506662014-12-10T18:44:00010 December 2014 18:44:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Inadvertent Loss of Vital Indication During Maintenance ENS 495712013-11-21T21:41:00021 November 2013 21:41:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Low Casing Cooling System Tank Level Potentially Causes Loss of Npsh to Outside Recirculation Spray Pumps ENS 445812008-10-18T15:25:00018 October 2008 15:25:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Boron Injection Tank Inlet Valves Inoperable. ENS 407392004-05-10T00:05:00010 May 2004 00:05:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident Both Unit 2 Emergency Diesels Declared Inoperable Due to Shims/Supports Found to Be Either Missing or Not Properly Fastened. 2015-10-08T01:47:00 | |
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