ENS 46220
ENS Event | |
|---|---|
23:19 Jul 26, 2010 | |
| Title | 60-Day Telephonic Notification in Lieu of a Written Licensee Event Report of Invalid Actuation |
| Event Description | On July 26, 2010, at 1819 hours0.0211 days <br />0.505 hours <br />0.00301 weeks <br />6.921295e-4 months <br /> [CDT], with Unit 1 in Mode 1 (Run), the Division 1 Diesel Generator Cooling Water Pump (DGCWP) restarted after being secured. The DGCWP provides the Emergency Service Water to the 1A Residual Heat Removal (RHR) pump room area cooler and the Reactor Core Isolation Cooling (RCIC) water pump/Low Pressure Core Spray [LPCS] pump room area cooler.
The apparent cause of the restart was the momentary interruption of the DGCWP run logic. The Division 1 DGCWP was in operation to support cooling of the Unit 1 RCIC/LPCS pump room area (run logic satisfied). When the Operator placed the Division 1 DGCWP control switch to the normal-after-stop position, the DGCWP feed breaker opened. The Operator reset the DGCWP feed breaker trip by returning the control switch to the normal-after-stop position and, because the run logic for the DGCWP was still satisfied [due to elevated room temperatures], the DGCWP restarted. This invalid start signal from the Division 1 DGCWP breaker being reset resulted in the automatic actuation of the Division 1 DGCWP. The Division 1 DGCWP responded satisfactorily. This report is being made in accordance with 10CFR50.73(a)(1), which states that in the case of an invalid actuation reported under 10CFR73(a)(2)(iv)(A), other than an actuation of the Reactor Protection System (RPS) when the reactor is critical, the licensee may provide a telephone notification to the NRC Operations Center with 60 days after discovery of the event instead of submitting a written LER. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Lasalle  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+878.38 h36.599 days <br />5.228 weeks <br />1.203 months <br />) | |
| Opened: | Jeff Williams 13:42 Sep 1, 2010 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Sep 1, 2010 |
| 46220 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 552402021-03-10T13:15:00010 March 2021 13:15:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of an Invalid Specified System Actuation ENS 530832017-10-06T14:10:0006 October 2017 14:10:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 522272016-07-11T09:30:00011 July 2016 09:30:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Division 1 Primary Containment Isolation Logic Due to a Blown Fuse ENS 491742013-05-22T16:34:00022 May 2013 16:34:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Telephonic Notification of Invalid Division 1 Containment Isolation Due to Motor Generator Trip ENS 462202010-07-26T23:19:00026 July 2010 23:19:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification in Lieu of a Written Licensee Event Report of Invalid Actuation ENS 458782010-03-05T10:39:0005 March 2010 10:39:00 10 CFR 50.73(a)(1), Submit an LER Invalid Isolation Signal Caused Msiv'S to Close ENS 433582007-03-15T06:02:00015 March 2007 06:02:00 10 CFR 50.73(a)(1), Submit an LER Invalid Eccs and System Actuations ENS 433332007-03-03T13:14:0003 March 2007 13:14:00 10 CFR 50.73(a)(1), Submit an LER Invalid Eccs Actuation During Refueling Outage ENS 427372006-06-04T09:19:0004 June 2006 09:19:00 10 CFR 50.73(a)(1), Submit an LER Invalid Rps Bus 'B' and Division 2 Pcis Actuations ENS 425262006-03-04T10:12:0004 March 2006 10:12:00 10 CFR 50.73(a)(1), Submit an LER Invalid Emergency Diesel Generator Start ENS 415602005-02-07T13:56:0007 February 2005 13:56:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation 2021-03-10T13:15:00 | |