ENS 50450
ENS Event | |
|---|---|
17:13 Jul 26, 2014 | |
| Title | Electrical Transient Causes an Invalid System Actuation |
| Event Description | At 1313 [EDT] on 7/26/14, the plant experienced an electrical transient on bus EK-1-B1 (safety-related 120 volt AC distribution panel) that resulted in partial Balance of Plant Division 2 isolation signals and alarms received in the Control Room.
The following component actuations occurred: valve 1P50F140 closed, resulting in a trip of Containment Vessel Chilled Water C; valve 1G41F140 closed, isolating the Fuel Pool Cooling and Clean-up return from the containment building upper pools; valve 1B33F019 closed, isolating Reactor Water sampling; valve 1D17F071B closed, isolating the Drywell Atmosphere Radiation Monitor; valve 1D17F081B closed, isolating the Containment Atmosphere Radiation Monitor; valves 1G61-F030, 1G61-F150, 1G61-F075, and 1G61-F165 closed, isolating the Containment and Drywell Floor and Equipment drain sumps; valve 1G50-F272 closed isolating the Reactor Water Cleanup Backwash Receiving Tank: 1M25F020B, Control Room HVAC Inboard supply damper, closed and Division 2 indicated an auto initiation (M25-S12, Auto Initiate Active amber light was on). This event is considered an invalid system actuation reportable under 10 CFR 50.73(a)(2)(iv)(A). The isolation was not initiated in response to actual plant conditions or parameters, and was not a manual initiation. Therefore, this notification is provided via a 60 day optional phone call in accordance with 10 CFR 50.73(a)(1) instead of submitting a written Licensee Event Report. The event meets reporting criteria specified in 10 CFR 50.73(a)(2)(iv)(B)(2) as a general containment isolation valve signal affecting containment isolation valves in more than one system. All affected systems functioned as expected in response to the electrical transient on bus EK-1-B1 that resulted in the partial Balance of Plant Division 2 isolation signals. The valves were reopened in accordance with plant procedures. The failure mechanism that caused the electrical transient was a failed capacitor in regulating transformer EFB1B2. The capacitor was replaced and tested with satisfactory results. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Perry  Ohio (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1144.98 h47.708 days <br />6.815 weeks <br />1.568 months <br />) | |
| Opened: | David Lockwood 10:12 Sep 12, 2014 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Sep 12, 2014 |
| 50450 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 552632021-03-23T04:37:00023 March 2021 04:37:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Diesel Generator Initiation ENS 510842015-03-26T20:29:00026 March 2015 20:29:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Primary Containment and Drywell Isolation Valve Actuation ENS 504502014-07-26T17:13:00026 July 2014 17:13:00 10 CFR 50.73(a)(1), Submit an LER Electrical Transient Causes an Invalid System Actuation ENS 483192012-07-24T00:57:00024 July 2012 00:57:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuations ENS 434522007-05-03T05:58:0003 May 2007 05:58:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 405982004-02-22T15:16:00022 February 2004 15:16:00 10 CFR 50.73(a)(1), Submit an LER Partial Rps Actuation During Testing at Perry ENS 404692003-11-29T20:26:00029 November 2003 20:26:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 401262003-08-02T01:18:0002 August 2003 01:18:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Division 2 Balance-Of-Power Inboard Isolation Valves 2021-03-23T04:37:00 | |