ENS 52051
ENS Event | |
|---|---|
10:26 May 9, 2016 | |
| Title | Invalid Actuation of Primary Containment Isolation Valves (Pcivs) |
| Event Description | This 60-day telephone notification is being made in lieu of a Licensee Event Report (LER) submittal in accordance with 10 CFR 50.73(a)(1) to notify the NRC of an invalid actuation of PCIVs, reportable under 10 CFR 50.73(a)(2)(iv)(A).
On May 9, 2016, at 0626 Eastern Daylight Time (EDT), an unexpected trip of the Unit 1 Reactor Protection System (RPS) Bus A occurred, resulting in closure of several PCIVs on loss of power, per design. In addition, the following actuations also occurred per design: - insertion of a half reactor scram signal. - initiation of the standby gas treatment (SBGT) system . - isolation of the secondary containment. - initiation of the control room emergency ventilation (CREV) system smoke and radiation mode. - trip of the operating reactor water cleanup system (RWCU) pump due to closure of its isolation valve. The event resulted from a failed relay coil in the drive motor run logic for the RPS power supply motor-generator (MG) set. The failed relay blew a fuse, which de-energized the RPS drive motor contactor and MG set. This resulted in de-energizing the RPS power supply in the 'A' channel and produced the actuations listed previously, per design. Affected systems and components were restored to their normal configurations by 1000 EDT on May 9, 2016. Since no plant or process conditions existed that required the PCIV isolations (e.g., high drywell pressure or low reactor water level), this event is being reported per 10 CFR 50.73(a)(1) as an invalid actuation. This issue has been entered into the site Corrective Action Program (CR 2027653) for evaluation and implementation of further corrective actions. This event did not result in any adverse impact to the health and safety of the public. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Brunswick  North Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1226.07 h51.086 days <br />7.298 weeks <br />1.679 months <br />) | |
| Opened: | Stephen W. Reed 12:30 Jun 29, 2016 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Jun 29, 2016 |
| 52051 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 575062024-12-05T22:05:0005 December 2024 22:05:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-DAY Notification of Invalid Actuation of Emergency Diesel Generator ENS 573872024-09-10T17:42:00010 September 2024 17:42:00 10 CFR 50.73(a)(1), Submit an LER 60-DAY Optional Telephonic Notification of Invalid Actuation of Containment Isolation Valves ENS 569882023-12-28T13:15:00028 December 2023 13:15:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generators ENS 562872022-11-09T14:06:0009 November 2022 14:06:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 561382022-08-06T10:28:0006 August 2022 10:28:00 10 CFR 50.73(a)(1), Submit an LER 60-DAY Optional Telephonic Notification of Invalid Actuation of Containment Isolation Valves ENS 558592022-03-07T04:40:0007 March 2022 04:40:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation 60-DAY Telephone Notification ENS 557562022-01-04T18:16:0004 January 2022 18:16:00 10 CFR 50.73(a)(1), Submit an LER 60-DAY Optional Telephonic Notification for Invalid Actuation of Containment Isolation Valves ENS 551912021-02-17T19:07:00017 February 2021 19:07:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 546752020-03-05T14:25:0005 March 2020 14:25:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification of an Invalid Specified System Actuation ENS 541442019-05-10T00:00:00010 May 2019 00:00:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Notification Due to Actuation of an Emergency Diesel Generator ENS 527782017-04-06T16:12:0006 April 2017 16:12:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generators ENS 520512016-05-09T10:26:0009 May 2016 10:26:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Primary Containment Isolation Valves (Pcivs) ENS 517392016-01-09T14:46:0009 January 2016 14:46:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generator ENS 515052015-09-10T01:03:00010 September 2015 01:03:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of a General Containment Isolation Signal Affecting More than One System ENS 498002013-12-11T13:18:00011 December 2013 13:18:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Primary Containment Isolation System (Pcis) Valves During I&C Maintenance ENS 491682013-05-08T01:14:0008 May 2013 01:14:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generators ENS 489722013-03-04T13:04:0004 March 2013 13:04:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generators ENS 442132008-03-15T20:35:00015 March 2008 20:35:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System (Pcis) Actuation ENS 437912007-09-21T18:10:00021 September 2007 18:10:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generators ENS 416922005-05-12T08:11:00012 May 2005 08:11:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.73(a)(1), Submit an LER Technical Specification Required Shutdown Due to Loss of Emergency Bus E1 ENS 413572004-12-13T21:15:00013 December 2004 21:15:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 405412004-01-11T11:37:00011 January 2004 11:37:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 404962003-12-22T03:04:00022 December 2003 03:04:00 10 CFR 50.73(a)(1), Submit an LER Invalid Reactor Building Exhaust Radiation Monitor Signal Resulting in Pcis Isolations 2024-09-10T17:42:00 | |