ENS 41119
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ENS Event | |
|---|---|
21:30 Sep 10, 2004 | |
| Title | Invalid Actuation of Steam Driven Auxiliary Feedwater Pump |
| Event Description | On September 10, 2004 at 1730 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.58265e-4 months <br />, one steam supply isolation valve (TV-1MS-105B) to the steam-driven Auxiliary Feedwater System Pump (FW-P-2) unexpectedly opened at Beaver Valley Power Station Unit No. 1, causing this pump to commence feeding all three steam generators. FW-P-2 functioned as designed with steam being supplied to the pump's steam-drive turbine. Neither of the other two Auxiliary Feedwater System motor-driven pumps were actuated at Beaver Valley Power Station Unit No. 1. This initially caused Steam Generator Water Level Deviations alarms on all three steam generators. The steam generator levels returned to their normal operating levels via the automatic level control system. After determining that there was no demand for this Auxiliary Feedwater System pump to be operating, the control room crew attempted to close TV-1MS-105B from the control room, without success. The upstream motor-operated isolation valve (MOV-1MS-105) to TV-1MS-105B was then closed to stop steam flow to FW-P-2, terminating the auxiliary feedwater flow to the steam generators.
No maintenance or tests were ongoing with the Auxiliary Feedwater System at the time. Subsequent investigation determined that this event occurred due to a failure of an instrument card within the Solid State Protection System which caused TV-1MS-105B to inappropriately open. Therefore this actuation was not initiated by a valid actuation signal. This event is reportable pursuant to 10 CFR 50.73(a)(2)(iv)(A) since it involved an actuation of a PWR auxiliary feedwater water system train as per 10 CFR 50.73(a)(2)(iv)(B)(6). This pump start was not part of a pre-planned sequence and did not occur with this system properly removed from service. However, pursuant to 10 CFR 50.73(a)(1), this event is being reported via this telephone notification instead of submitting a written Licensee Event Report since the automatic actuation of the Auxiliary Feedwater System pump was not generated by a valid actuation. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
| Beaver Valley Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+809.17 h33.715 days <br />4.816 weeks <br />1.108 months <br />) | |
| Opened: | Ronald Timothy Green 14:40 Oct 14, 2004 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Oct 14, 2004 |
| 41119 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Beaver Valley with 10 CFR 50.73(a)(1), Submit an LER | |
WEEKMONTHYEARENS 556022021-09-30T14:07:00030 September 2021 14:07:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-DAY Optional Telephonic Notification for an Invalid Emergency Diesel Generator Actuation ENS 468172011-03-15T21:16:00015 March 2011 21:16:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the Standby Service Water Pump ENS 468162011-03-07T15:18:0007 March 2011 15:18:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of the Auxiliary Feedwater System ENS 450992009-05-06T17:52:0006 May 2009 17:52:00 10 CFR 50.73(a)(1), Submit an LER Automatic Actuation of Rps, Eccs and Edg Generated by an Invalid Actuation Signal ENS 450012009-04-20T05:53:00020 April 2009 05:53:00 10 CFR 50.73(a)(1), Submit an LER Unexpected Start of the Steam Driven Auxiliary Feedwater Pump During Plant Cooldown ENS 446612008-10-16T14:07:00016 October 2008 14:07:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Steam Driven Aux Feed Pump ENS 411192004-09-10T21:30:00010 September 2004 21:30:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Steam Driven Auxiliary Feedwater Pump 2021-09-30T14:07:00 | |
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