ENS 50549
ENS Event | |
|---|---|
20:56 Oct 1, 2014 | |
| Title | Two Invalid Specified System Actuations of Safety Injection |
| Event Description | This 60-day telephone notification is provided in accordance with 10 CFR 50.73(a)(1) to report [two separate] invalid actuations of the Unit 4 Safety Injection (SI) System in accordance with 10 CFR 50.73(a)(2)(iv)(A).
On October 1, 2014 at approximately 1656 [EDT], Sl was actuated on low pressurizer pressure when the Sl signal block was inadvertently removed during pressure transmitter calibrations. The actuation was invalid because it was not in response to an actual plant condition requiring the need for Sl. Containment and containment ventilation isolation were initiated, and the following equipment automatically started: 4B residual heat removal pump; 3A, 3B and 4B high head safety injection (HHSI) pumps; 3A, 3B and 4B diesel generators (DG). This was a partial Sl actuation because of equipment removed from service or already in service due to unit outage conditions. Actuated equipment started and functioned successfully. Emergency core cooling system (ECCS) injection did not occur. The DGs started but did not load. On October 7, 2014 at approximately 1607 [EDT while unit was in a defueled status], Sl was actuated on low pressurizer pressure during restoration of power to the Train A instrumentation rack. The Sl actuation occurred when a fuse was inserted reenergizing the logic circuit because an incorrect test switch was manipulated during a prior procedure step. Properly positioning the correct test switch would have blocked the low pressurizer pressure signal. The actuation was invalid because it was not in response to an actual plant condition requiring the need for Sl. Containment isolation, containment ventilation isolation, control room isolation, feedwater isolation, and turbine trip were initiated, and the following equipment automatically started: 3A, 3B and 4A HHSI pumps; 3A, 3B, 4A and 4B DGs: 4A intake cooling water pump with isolation of turbine plant cooling water heat exchangers. This was a partial Sl actuation because of equipment removed from service or already in service due to unit outage conditions. Actuated equipment started and functioned successfully. ECCS injection did not occur. The DGs started but did not load. The NRC Senior Resident Inspector has been notified. .. |
| Where | |
|---|---|
Turkey Point  Florida (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+402.4 h16.767 days <br />2.395 weeks <br />0.551 months <br />) | |
| Opened: | Bob Tomonto 15:20 Oct 18, 2014 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Oct 18, 2014 |
| 50549 - NRC Website
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WEEKMONTHYEARENS 527962017-04-10T17:47:00010 April 2017 17:47:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation During Testing ENS 515472015-11-18T08:26:00018 November 2015 08:26:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of 3A Emergency Diesel Generator (Edg) ENS 505492014-10-01T20:56:0001 October 2014 20:56:00 10 CFR 50.73(a)(1), Submit an LER Two Invalid Specified System Actuations of Safety Injection ENS 490172013-03-11T04:43:00011 March 2013 04:43:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the Auxiliary Feedwater System 2017-04-10T17:47:00 | |