ENS 50112
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ENS Event | |
|---|---|
00:30 Mar 19, 2014 | |
| Title | 60-Day Optional Telephonic Notification for an Invalid Actuation of Containment Isolation Valves |
| Event Description | This 60-day report, as allowed by 10 CFR 50.73(a)(1), is being made pursuant to 10 CFR 50.73(a)(2)(iv)(A) to describe an unplanned, invalid actuation of containment isolation valves which occurred during the most recent refueling outage at Fermi 2. On 3/18/2014, at approximately 1930 EST, shortly after transferring Division 2 Reactor Protection System (RPS B) from the alternate to the normal power supply, Operations personnel noted that an unexpected half-scram occurred. Initial investigation found a fuse in an RPS Power Distribution Panel had blown. Further investigation found that a power contactor had failed causing the fuse to blow. The contactor failure resulted in an invalid half scram and actuations (closure) of Torus Water Management System (TWMS) Outboard containment isolation valves, Division 2 Drywell Pneumatics Inboard and Outboard containment isolation valves and the Drywell Floor and Equipment Drain Sumps Inboard containment isolation valves. All valves operated as expected. Since containment isolation valves in more than one system were actuated by this failure, this event constitutes an event or condition that resulted in manual or automatic actuation of the system listed in paragraph 10 CFR 50.73 (a)(2)(iv)(B)(2) and is reportable under 10 CFR 50.73(a)(2)(iv)(A).
The NRC Resident Inspector has been informed of this notification. |
| Where | |
|---|---|
Fermi  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1334.17 h55.59 days <br />7.941 weeks <br />1.828 months <br />) | |
| Opened: | Brett Jebbia 14:40 May 13, 2014 |
| NRC Officer: | Steve Sandin |
| Last Updated: | May 13, 2014 |
| 50112 - NRC Website
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WEEKMONTHYEARENS 528592017-03-24T19:48:00024 March 2017 19:48:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation During Testing ENS 511282015-05-24T23:30:00024 May 2015 23:30:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Actuation of Containment Isolation Valves ENS 501122014-03-19T00:30:00019 March 2014 00:30:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Actuation of Containment Isolation Valves ENS 438502007-10-22T23:30:00022 October 2007 23:30:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 438402007-10-14T07:00:00014 October 2007 07:00:00 10 CFR 50.73(a)(1), Submit an LER Inadvertent Actuation of Emergency Diesel Generator ENS 424282006-02-10T16:20:00010 February 2006 16:20:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuations ENS 408992004-05-30T14:40:00030 May 2004 14:40:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves Due to Partial Loss of 120 Vac Modular Power Unit 2 Loads 2017-03-24T19:48:00 | |
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