ENS 44940
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ENS Event | |
|---|---|
15:55 Mar 2, 2009 | |
| Title | Invalid Primary Containment Isolation Signal Due to Maintenance Error |
| Event Description | This 60-day 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 Unit 3 Primary Containment Isolation System (PCIS). On 3/2/09, at approximately 1155 hours0.0134 days <br />0.321 hours <br />0.00191 weeks <br />4.394775e-4 months <br />, Unit 3 experienced an invalid PCIS partial isolation. Associated with the momentary shorting of a terminal lead during maintenance, a fuse was blown and power was lost to nine Primary Containment Isolation Valves (PCIVs). This resulted in two of the PCIVs re-positioning to the closed position. The re-positioned PCIVs were the AO-3-07B-3509 (Inner Drywell Exhaust Valve) and the AO-3-16-5235 (Instrument Nitrogen System Suction Valve). Closure of these valves affected the Containment Atmospheric Control (CAC), Containment Atmospheric Dilution (CAD) and Containment Instrument Nitrogen systems. Closure of these valves was the expected response for loss of power to this portion of the PCIS control circuitry. The fuse was replaced and the valves were restored to an operable condition by 1235 hours0.0143 days <br />0.343 hours <br />0.00204 weeks <br />4.699175e-4 months <br /> on 3/2/09.
The invalid PCIS isolation was a result of the momentary shorting of an energized terminal lead associated with preventive maintenance to replace a pressure switch associated with PCIV AO-3-07B-3519 (Nitrogen Supply Purge Valve). This issue has been entered into the site Corrective Action Program (CR 887441) for evaluation and implementation of further corrective actions. The NRC resident 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:+593.75 h24.74 days <br />3.534 weeks <br />0.813 months <br />) | |
| Opened: | Dave Foss 08:40 Mar 27, 2009 |
| NRC Officer: | Jason Kozal |
| Last Updated: | Mar 27, 2009 |
| 44940 - 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 | |
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