ENS 50666: Difference between revisions
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| event date = 12/10/2014 13:44 EST | | event date = 12/10/2014 13:44 EST | ||
| last update date = 12/10/2014 | | last update date = 12/10/2014 | ||
| title = Inadvertent Loss | | title = Inadvertent Loss of Vital Indication During Maintenance | ||
| event text = 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. | | event text = 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. | 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. | ||
Latest revision as of 21:49, 1 March 2018
| 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
| |
North Anna with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |