ENS 46881: Difference between revisions
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| event date = 03/26/2011 20:05 CDT | | event date = 03/26/2011 20:05 CDT | ||
| last update date = 05/24/2011 | | last update date = 05/24/2011 | ||
| title = 60-Day Telephonic Notification | | title = 60-Day Telephonic Notification of Invalid Primary Containment Isolation Signal Due to Maintenance | ||
| event text = This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv) and 10 CFR 50.73(a)(1) to describe an invalid actuation of multiple secondary containment isolation signals affecting more than one system. | | event text = This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv) and 10 CFR 50.73(a)(1) to describe an invalid actuation of multiple secondary containment isolation signals affecting more than one system. | ||
On March 26, 2011, at 2005 hours Central Daylight Time (CDT), following planned maintenance activities, an unplanned actuation of secondary containment isolation signals affecting containment isolation valves in more than one system occurred and resulted in a partial Primary Containment Isolation System (PCIS) (Group 6, Secondary Containment) isolation and receipt of a Unit 2 Reactor Building Ventilation Abnormal Alarm. Unit 2 was in Mode 4, in a refueling outage, and at 0 percent power (0 MWT). Units 1 and 3 were both in Mode 1 and operating at approximately 100 percent power. | On March 26, 2011, at 2005 hours Central Daylight Time (CDT), following planned maintenance activities, an unplanned actuation of secondary containment isolation signals affecting containment isolation valves in more than one system occurred and resulted in a partial Primary Containment Isolation System (PCIS) (Group 6, Secondary Containment) isolation and receipt of a Unit 2 Reactor Building Ventilation Abnormal Alarm. Unit 2 was in Mode 4, in a refueling outage, and at 0 percent power (0 MWT). Units 1 and 3 were both in Mode 1 and operating at approximately 100 percent power. | ||
Latest revision as of 21:07, 1 March 2018
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1409.07 h58.711 days <br />8.387 weeks <br />1.93 months <br />) | |
| Opened: | Ricky Givens 18:09 May 24, 2011 |
| NRC Officer: | Howie Crouch |
| Last Updated: | May 24, 2011 |
| 46881 - NRC Website
| |
| 60-Day Optional Telephonic Notification of an Invalid Actuation of a General Containment Isolation Signal Affecting More than One System | 60-Day Optional Telephonic Notification of an Invalid Specified System Actuation [Table view] | ||