ENS 57206
ENS Event | |
|---|---|
00:28 May 14, 2024 | |
| Title | Invalid Partial Containment Isolation |
| Event Description | The following information was provided by the licensee via phone and email:
At 1928 CDT on May 13, 2024, River Bend Station (RBS) was operating in Mode 1 at 100 percent power when an invalid isolation signal actuated multiple containment isolation valves in more than one system. The invalid isolation signal was caused by voltage perturbations on the offsite power distribution system due to multiple lightning strikes in the vicinity of RBS. The event caused one containment isolation valve to isolate in the floor and equipment drains system, and two containment isolation dampers to isolate in the auxiliary building ventilation system. This event was a partial system isolation for the affected systems and did not result in a full train actuation. This event meets the reportable criteria for 10 CFR 50.73(a)(2)(iv)(A) and is being reported as any event or condition that resulted in manual or automatic actuation of any systems listed in paragraph (a)(2)(iv)(B). This notification is being provided in lieu of a Licensee Event Report as indicated in 10 CFR 50.73(a)(1). The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: The valve and dampers were immediately re-opened. The standby gas treatment system automatically initiated due to the closure of the containment isolation dampers in the auxiliary building ventilation system. |
| Where | |
|---|---|
River Bend  Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1185.67 h49.403 days <br />7.058 weeks <br />1.624 months <br />) | |
| Opened: | Darren Farthing 10:08 Jul 2, 2024 |
| NRC Officer: | Robert A. Thompson |
| Last Updated: | Jul 2, 2024 |
| 57206 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 572062024-05-14T00:28:00014 May 2024 00:28:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Partial Containment Isolation ENS 541212019-04-30T11:50:00030 April 2019 11:50:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification Due to Invalid Actuation of a General Containment Isolation Signal ENS 517842016-01-10T08:43:00010 January 2016 08:43:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the Primary Containment Isolation Logic ENS 510032015-02-24T22:02:00024 February 2015 22:02:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephone Notification of Invalid System Actuation Due to Motor Generator Output Breaker Trip ENS 507742014-12-06T16:12:0006 December 2014 16:12:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Report - Half Scram and a Division 2 Primary Containment Isolation Signal ENS 468442011-03-20T12:24:00020 March 2011 12:24:00 10 CFR 50.73(a)(1), Submit an LER "a" Train Reactor Protection System Unexpectedly De-Energized Resulting in a Half Scram Signal ENS 445172008-08-01T00:30:0001 August 2008 00:30:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves Due to a Power Failure ENS 443472008-06-02T11:24:0002 June 2008 11:24:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation of Division 1 Containment Isolation Valves ENS 442782008-04-23T20:56:00023 April 2008 20:56:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Notification of Invalid Specified System Actuation ENS 430122006-09-29T18:33:00029 September 2006 18:33:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specific System Actuation ENS 408472004-05-22T09:29:00022 May 2004 09:29:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Division 1 Primary Containment Isolation Due to Loss of a Rps Bus 2024-05-14T00:28:00 | |