ENS 40126
ENS Event | |
|---|---|
01:18 Aug 2, 2003 | |
| Title | Invalid Actuation Of Division 2 Balance-Of-Power Inboard Isolation Valves |
| Event Description | On August 1, 2003, at 2118 hours0.0245 days <br />0.588 hours <br />0.0035 weeks <br />8.05899e-4 months <br />, the Perry Nuclear Power Plant experienced an actuation of several Division 2 Balance-of-Plant (BOP) inboard isolation valves. At the time of the event, the plant was in Mode 1 (Power Operation). The isolation closed one or more valves in each of the following Division 2 subsystems: Liquid Radwaste Sumps, Containment Vessel Chilled Water, Reactor Water Sampling, Drywell and Containment Radiation Monitoring, and Control Room Ventilation.
The event is considered an invalid system actuation, and is 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. It meets the criteria specified in 10 CFR 50.73(a)(2)(iv)(B)(2) as a general containment isolation signal affecting containment isolation valves in more than one system. Therefore, notification is being provided via 60-day optional phone call in accordance with 10 CFR 50.73(a)(1). All systems functioned as expected for a partial BOP (inboard) isolation. Repositioning of the valves did not present operational concerns; they were re-opened per restoration procedures. The BOP isolation was attributed to an electrical transient on 120 volt AC electrical bus EK-1-B1 as a result of a failed capacitor. The capacitor had been previously replaced during Refuel Outage 9. This event was documented in the Corrective Action Program. Remedial actions include replacement of the defective capacitor. The capacitor will be sent out for failure analysis. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Perry  Ohio (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+759.42 h31.643 days <br />4.52 weeks <br />1.04 months <br />) | |
| Opened: | Ken Russell 16:43 Sep 2, 2003 |
| NRC Officer: | Bill Gott |
| Last Updated: | Sep 2, 2003 |
| 40126 - 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 | |