ENS 41192
ENS Event | |
|---|---|
08:57 Sep 18, 2004 | |
| Title | Invalid Specified System Actuation Due to Off Site Power Source Fast Transfer |
| Event Description | This 60-day optional report, as allowed by 10 CFR 50.73(a)(1), is being made under the reporting requirement in 10CFR50.73(a)(2)(iv)(A) to describe an unplanned, invalid actuation of specified systems, specifically the Units 2 and 3 Primary Containment Isolation Systems (PCIS).
On 9/18/04, at approximately 0357 hours0.00413 days <br />0.0992 hours <br />5.902778e-4 weeks <br />1.358385e-4 months <br /> [EDT], the 343SU offsite-power source tripped resulting in a fast transfer of expected 4 kV emergency busses to the alternate offsite power source. The fast transfer resulted in system isolations on both units due to the affect on the PCIS instrumentation logic. The system isolations are an expected occurrence for a fast transfer. The isolations involved various process lines such as Reactor Water Cleanup (RWCU) and Containment Atmospheric Control (CAC) / Containment Atmospheric Dilution (CAD). The Units 2 and 3 PCIS isolations were reset by approximately 0420 hours0.00486 days <br />0.117 hours <br />6.944444e-4 weeks <br />1.5981e-4 months <br /> in accordance with procedures. All required isolation valves operated as designed. The offsite power source (343SU) was lost as a result of a momentary deenergization of the 220-34 Newlinville Transmission Line to clear a ground fault. The fault was approximately 29 miles from the PBAPS site and was caused by a lightning strike to a transmission tower near the Newlinville substation. Field inspections of the 220-34 Transmission Lines and Towers were performed and it was identified that there was a flash mark on the tower insulator confirming the lightning strike. It was determined that the protective relaying for the 220-34 Newlinville Transmission Line operated as designed. The 343SU offsite power source was returned to service by approximately 2115 hours0.0245 days <br />0.588 hours <br />0.0035 weeks <br />8.047575e-4 months <br /> on 9/18/04. This issue has been entered into the site Corrective Action Program (CR 254392) for evaluation and implementation of further corrective actions. The NRC Resident Inspector has been informed of this notification. |
| Where | |
|---|---|
Peach Bottom  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1321.02 h55.043 days <br />7.863 weeks <br />1.81 months <br />) | |
| Opened: | David Foss 10:58 Nov 12, 2004 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Nov 12, 2004 |
| 41192 - NRC Website
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Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 562802022-11-12T04:33:00012 November 2022 04:33:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-DAY Telephonic Notification ENS 548202020-06-08T08:24:0008 June 2020 08:24:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 529612017-07-14T18:53:00014 July 2017 18:53:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 519622016-03-28T17:20:00028 March 2016 17:20:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 500892014-03-09T21:13:0009 March 2014 21:13:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Actuation of an Emergency Service Water System ENS 479072012-03-13T20:04:00013 March 2012 20:04:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Report - Invalid Primary Containment Isolation System Actuation ENS 449402009-03-02T15:55:0002 March 2009 15:55:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation Signal Due to Maintenance Error ENS 444652008-07-24T03:25:00024 July 2008 03:25:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation Due to Loss of One Offsite Power Circuit to Safety Buses ENS 439102007-12-11T21:45:00011 December 2007 21:45:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Notification of an Invalid Actuation of Units 2 and 3 Primary Containment Isolation Systems ENS 411932004-09-28T06:00:00028 September 2004 06:00:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation Due to Bus Voltage Dip During Recirc Mg Start ENS 411922004-09-18T08:57:00018 September 2004 08:57:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation Due to Off Site Power Source Fast Transfer ENS 408192004-04-25T05:05:00025 April 2004 05:05:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 401982003-09-25T04:00:00025 September 2003 04:00:00 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown, 10 CFR 50.73(a)(1), Submit an LER Initiation of a Technical Specification Required Shutdown at Peach Bottom 2 ENS 401042003-07-27T22:39:00027 July 2003 22:39:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Report 2022-11-12T04:33:00 | |