ENS 52227
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ENS Event | |
|---|---|
09:30 Jul 11, 2016 | |
| Title | Invalid Actuation of Division 1 Primary Containment Isolation Logic Due to a Blown Fuse |
| Event Description | On July 11, 2016, at approximately 0430 CDT, while Unit 1 was operating at 100% power, the 1A Reactor Protection System (RPS) Motor Generator (M/G) set tripped causing a loss of the A RPS bus. This caused the complete actuation of the Division 1 (outboard) primary containment isolation logic. The isolation logic actuation resulted in successful closure of the Division 1 primary containment isolation valves. This was an event that resulted in the actuation of a general containment isolation signal affecting more than one system. However, as this event meets the definition of an invalid actuation (i.e., not a response to an actual plant parameter exceeding a trip set-point), this notification is being made in accordance with 10CFR50.73(a)(2)(iv)(A) in lieu of a Licensee Event Report.
In response to the trip of the 1A RPS M/G Set, operators swapped the A RPS bus to the alternate power supply using the applicable response procedure. The containment isolation signal was reset and the systems were restored to their normal lineup. Reactor power was not affected by this event. All safety related equipment controlled by the affected primary containment isolation circuits operated as designed. The 1A RPS M/G Set trip was due to a blown power fuse for the 1A RPS M/G Set. This was the result of worn insulation on one of the generator output leads. The generator output leads were repaired and rerouted to prevent future problems on 07/15/16. Restoration of the normal power supply to the 1A RPS function was completed on 7/19/16. The licensee informed the NRC Resident Inspector. |
| Where | |
|---|---|
Lasalle  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1421.33 h59.222 days <br />8.46 weeks <br />1.947 months <br />) | |
| Opened: | Rudy Caputo 14:50 Sep 8, 2016 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Sep 8, 2016 |
| 52227 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 552402021-03-10T13:15:00010 March 2021 13:15:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of an Invalid Specified System Actuation ENS 530832017-10-06T14:10:0006 October 2017 14:10:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation ENS 522272016-07-11T09:30:00011 July 2016 09:30:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Division 1 Primary Containment Isolation Logic Due to a Blown Fuse ENS 491742013-05-22T16:34:00022 May 2013 16:34:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Optional Telephonic Notification of Invalid Division 1 Containment Isolation Due to Motor Generator Trip ENS 462202010-07-26T23:19:00026 July 2010 23:19:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Telephonic Notification in Lieu of a Written Licensee Event Report of Invalid Actuation ENS 458782010-03-05T10:39:0005 March 2010 10:39:00 10 CFR 50.73(a)(1), Submit an LER Invalid Isolation Signal Caused Msiv'S to Close ENS 433582007-03-15T06:02:00015 March 2007 06:02:00 10 CFR 50.73(a)(1), Submit an LER Invalid Eccs and System Actuations ENS 433332007-03-03T13:14:0003 March 2007 13:14:00 10 CFR 50.73(a)(1), Submit an LER Invalid Eccs Actuation During Refueling Outage ENS 427372006-06-04T09:19:0004 June 2006 09:19:00 10 CFR 50.73(a)(1), Submit an LER Invalid Rps Bus 'B' and Division 2 Pcis Actuations ENS 425262006-03-04T10:12:0004 March 2006 10:12:00 10 CFR 50.73(a)(1), Submit an LER Invalid Emergency Diesel Generator Start ENS 415602005-02-07T13:56:0007 February 2005 13:56:00 10 CFR 50.73(a)(1), Submit an LER Invalid Specified System Actuation 2021-03-10T13:15:00 | |
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