ENS 50781: Difference between revisions
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| event date = 01/31/2015 14:31 EST | | event date = 01/31/2015 14:31 EST | ||
| last update date = 01/31/2015 | | last update date = 01/31/2015 | ||
| title = Manual Rps Actuation Due | | title = Manual Rps Actuation Due to Oscillations in the Feedwater System | ||
| event text = At 1431 EST on 1/31/15, Oconee Unit 3 was manually tripped due to oscillations in the feedwater system in anticipation of an automatic trip. At 1427 EST, Unit 3 began experiencing small feedwater oscillations. Specifically, 3FDW-32, the 3A main feedwater control valve, appeared to be oscillating with corresponding feedwater flow oscillation. Feedwater oscillations continued to grow in magnitude and at 1431 EST a manual trip was directed by the Unit 3 control room supervisor. The shutdown was orderly and the unit is currently stable and in Mode 3 (Hot Standby). Units 1 and 2 were unaffected by the trip and are currently 100% power (Mode 1). | | event text = At 1431 EST on 1/31/15, Oconee Unit 3 was manually tripped due to oscillations in the feedwater system in anticipation of an automatic trip. At 1427 EST, Unit 3 began experiencing small feedwater oscillations. Specifically, 3FDW-32, the 3A main feedwater control valve, appeared to be oscillating with corresponding feedwater flow oscillation. Feedwater oscillations continued to grow in magnitude and at 1431 EST a manual trip was directed by the Unit 3 control room supervisor. The shutdown was orderly and the unit is currently stable and in Mode 3 (Hot Standby). Units 1 and 2 were unaffected by the trip and are currently 100% power (Mode 1). | ||
Due to the RPS actuation while critical, this event is being reported as a 4-hour non-emergency per 10CFR50.72(b)(2)(iv)(B). | Due to the RPS actuation while critical, this event is being reported as a 4-hour non-emergency per 10CFR50.72(b)(2)(iv)(B). | ||
Latest revision as of 21:48, 1 March 2018
| Where | |
|---|---|
Oconee  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| LER: | 05000287/LER-2015-001 05000287/LER-2015-001 Manual Reactor Trip Due to Unacceptable Main Feedwater Flow Control Valve Oscillations |
| Time - Person (Reporting Time:+-1.52 h-0.0633 days <br />-0.00905 weeks <br />-0.00208 months <br />) | |
| Opened: | Daniel D Wilson 18:00 Jan 31, 2015 |
| NRC Officer: | Charles Teal |
| Last Updated: | Jan 31, 2015 |
| 50781 - NRC Website
| |