ENS Event | |
|---|---|
00:27 May 5, 2015 | |
| Title | Invalid Auxiliary Feedwater Actuation System Partial Actuation |
| Event Description | On May 4, 2015 with Unit 1 in Mode 1 at 100 percent power, during performance of the 'A' channel Auxiliary Feedwater Actuation System (AFAS) monthly functional test, an invalid 'A' channel AFAS actuation occurred. The monthly functional test resulted with AFAS-1 in a half trip condition. Due to a poor contact on a manual actuation switch, a pathway was dropped out causing the partial AFAS actuation to occur. The faulty mechanical switch was replaced and the post maintenance testing was satisfactory.
The partial AFAS actuation resulted in the successful start of 'A' AFW electric driven pump and the opening of its motor control valve, feeding the 'A' steam generator. The system responded to the invalid actuation as designed. In accordance with 10 CFR 50.73(a)(1), this notification of the invalid actuation is provided in lieu of a written LER. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Saint Lucie  Florida (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1378.2 h57.425 days <br />8.204 weeks <br />1.888 months <br />) | |
| Opened: | Tom Plower 10:39 Jul 1, 2015 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Jul 1, 2015 |
| 51195 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 511952015-05-05T00:27:0005 May 2015 00:27:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid Auxiliary Feedwater Actuation System Partial Actuation ENS 496882013-11-03T08:23:0003 November 2013 08:23:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Report Involving an Invalid Partial Actuation of Unit 1 Edg "1A" Due to a Failed Relay 2015-05-05T00:27:00 | |