ENS 40733
ENS Event | |
|---|---|
16:32 Mar 21, 2004 | |
| Title | Invalid Actuation of Containment Isolation Signals in More than One System |
| Event Description | The following information was obtained from the licensee via facsimile:
On 03/21/04 at 12:32 hours [EST], a JLG Manlift working on the Unit 1 Cooling Tower came into contact with a 230 KV transmission line, causing the loss of one of two off-site power supplies to the plant [Startup Transformer T-10 and its associated loads]. The other Startup Transformer [T-20] assumed the extra electrical load, as designed, and restored power to the station. At the time of this event, Unit 1 was in Mode 5 and Unit 2 was in Mode 1. Both Units continued in Modes 5 and 1, respectively. As a result of the loss of the T-10 transformer, the following Unit 2 Primary Containment Isolation [Valves][PCIVs] closed on loss of logic power: Containment Atmosphere Control PCIVs HV-25740A, HV-25750A, HV-25776A, HV25780A, HV-25736A, and HV-25742A, HV-25752A, HV-25774A, HV-25782A, HV-25734A. Drywell Sump PCIVs HV-261108 A1 and A2 closed. Reactor Building Chilled Water PCIVs HV-28791 A1 and A2 and HV-28792 A1 and A2 closed. Recirculation Sample PCIV HV-243F019 closed. All isolation signals were successfully reset and the T-10 line was subsequently restored. The Unit 2 electrical transient event resulted in general containment isolation signals affecting containment isolation valves in more than one system and is therefore being reported per 10 CFR 50.73(a)(1) and 10 CFR 50.73(a)(2)(iv)(A). A voluntary ENS Phone Notification to the NRC, related to this event, was previously made on 03/21/04, due to notification of the Pennsylvania Emergency Management Agency [PEMA], because an emergency vehicle entered plant property. The above listed systems' Division 1 containment isolation valve actuations were completed and functioned successfully on loss of logic power. The licensee has informed the NRC Resident Inspector of this notification. |
| Where | |
|---|---|
Susquehanna  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1128.17 h47.007 days <br />6.715 weeks <br />1.545 months <br />) | |
| Opened: | Donald Roland 15:42 May 7, 2004 |
| NRC Officer: | Howie Crouch |
| Last Updated: | May 7, 2004 |
| 40733 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 541032019-04-18T05:10:00018 April 2019 05:10:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification Due to Invalid Specified System Actuation ENS 527722017-04-03T01:27:0003 April 2017 01:27:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 480922012-05-14T13:28:00014 May 2012 13:28:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Emergency Service Water Actuation ENS 457262010-02-25T19:18:00025 February 2010 19:18:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 435552007-06-09T09:11:0009 June 2007 09:11:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the 'C' Emergency Diesel Generator ENS 424892006-03-11T09:32:00011 March 2006 09:32:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 407662004-04-04T18:57:0004 April 2004 18:57:00 10 CFR 50.73(a)(1), Submit an LER 60 -Day Report: Invalid Actuation of the "E" Emergency Diesel Generator ENS 407332004-03-21T16:32:00021 March 2004 16:32:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Signals in More than One System ENS 401732003-08-29T14:25:00029 August 2003 14:25:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves 2019-04-18T05:10:00 | |