ENS 47587
ENS Event | |
|---|---|
12:09 Dec 4, 2011 | |
| Title | Invalid Actuation of Containment Isolation Signals and an Emergency Service Water Pump |
| Event Description | The following information is provided as a sixty (60) day telephone notification to the NRC in accordance with 50.73 (a)(1) in lieu of the submittal of a written LER to report a condition that resulted in an invalid actuation of general containment isolation signals affecting containment isolation valves in more than one system and emergency service water systems that normally do not run and that serve as ultimate heat sinks. NUREG-1022, Revision 2, identifies the information that needs to be reported as discussed below.
On December 4, 2011, Clinton Power Station was in Mode 5 (Refueling) conducting refueling outage activities, including the installation of a self test system power supply modification. During post-maintenance activities associated with the affected power supplies, an unexpected voltage reading was identified. While investigating the anomaly, one of the two nuclear system protection system essential logic power supplies was de-energized with the redundant power supply not yet restored. At 0609 [CST], the power supply was re-energized, resulting in an inadvertent actuation of the logic. Containment isolation valves on the following systems automatically closed: Instrument Air, Service Air, and Containment Floor Drain. Additionally, the Division 1 Shutdown Service Water (SX) Pump started. These actuations were not valid since the actuations were associated with low reactor water level conditions (Level 1 and Level 2) which were non-existent at the time of the event. The associated actuations were successful had the actuations been valid. This event is reportable in accordance with 10CFR50.73 (a)(2)(iv)(A) and has been entered into the Corrective Action Program. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Clinton  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+935.45 h38.977 days <br />5.568 weeks <br />1.281 months <br />) | |
| Opened: | Dale Shelton 11:36 Jan 12, 2012 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Jan 12, 2012 |
| 47587 - NRC Website
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WEEKMONTHYEARENS 528622017-05-18T16:15:00018 May 2017 16:15:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Emergency Diesel Generator ENS 512082015-05-11T06:19:00011 May 2015 06:19:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the Division 2 Emergency Diesel Generator ENS 504522014-07-26T21:48:00026 July 2014 21:48:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 475872011-12-04T12:09:0004 December 2011 12:09:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Signals and an Emergency Service Water Pump ENS 459012010-03-15T06:38:00015 March 2010 06:38:00 10 CFR 50.73(a)(1), Submit an LER Optional 60-Day Report of Invalid Specified System Actuation ENS 425952006-03-26T08:47:00026 March 2006 08:47:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Notification - Invalid Actuation of High Pressure Core Spray Pump ENS 424772006-02-08T03:59:0008 February 2006 03:59:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuations ENS 418212005-05-12T20:48:00012 May 2005 20:48:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the Division 2 Shutdown Service Water (Sx) System Pump. 2017-05-18T16:15:00 | |