ENS 43921
ENS Event | |
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04:02 Jan 20, 2008 | |
Title | Automatic Reactor Trip Following Turbine Trip |
Event Description | Initiating alarm received was a Turbine Trip. All on site buses 1, 2, 4, 5 and 6 swapped to the Reserve Auxiliary Transformer power supplies. Bus 3 did not swap as expected. The station has entered a Technical Specification 3.8.1.1 (a) 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> action statement for offsite power distribution with 345 kV Bus 3 unavailable.
All safety systems operated correctly. The station continues to troubleshoot the initiating cause of the Turbine Trip. The plant is stable in Mode 3. During the swap of non safety buses to the Reserve Auxiliary Transformer the Reactor Coolant Pumps (RCP) tripped. Following the loss of power to the RCPs the reactor stabilized in natural circulation. A Pressurizer PORV cycled following the trip. One RCP was restarted to restore forced circulation. Auxiliary Feedwater Pumps started as expected on the trip and were subsequently secured. All control rods fully inserted on the trip. The current decay heat removal path is Start-up Feedwater supplying water to the Steam Generators steaming to the Condenser Steam Dumps. The licensee notified the NRC Resident Inspector.
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Where | |
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Seabrook New Hampshire (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
LER: | 05000443/LER-2008-001 |
Time - Person (Reporting Time:+-1.12 h-0.0467 days <br />-0.00667 weeks <br />-0.00153 months <br />) | |
Opened: | Matt Forrest 02:55 Jan 20, 2008 |
NRC Officer: | Pete Snyder |
Last Updated: | Jan 20, 2008 |
43921 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | A/R |
Before | Power Operation (100 %) |
After | Hot Standby (0 %) |
Seabrook with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 574312024-11-19T18:50:00019 November 2024 18:50:00
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