ENS 41452
ENS Event | |
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05:43 Mar 1, 2005 | |
Title | Manual Reactor Scram From 15% Power Due To High Turbine Vibration |
Event Description | The following details were provided by the licensee via fax as part of their telephonic notification:
Manual reactor scram due to high turbine generator vibration during a planned Unit 1 power reduction to Mode 2 to perform maintenance to replace the vent line piping on 11 MSR drain tank. The manual reactor scram was initiated per AOP-7E, section V, 'High Turbine Vibration' trip criteria when bearing #5 exceeded 12 mils vibration. This event meets NUREG-1022 Rev. 2, Section 3.2.6 'System Actuation' Part 50.72(b)(2)(iv)(B) 'Any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation.' All rods fully inserted and no ECCS or relief valve actuations occurred. Heat sink is the condenser and turbine bypass valves. The NRC resident inspector was notified. |
Where | |
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Calvert Cliffs Maryland (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
LER: | 05000317/LER-2005-002 |
Time - Person (Reporting Time:+-2.87 h-0.12 days <br />-0.0171 weeks <br />-0.00393 months <br />) | |
Opened: | Bob Pace 02:51 Mar 1, 2005 |
NRC Officer: | Chauncey Gould |
Last Updated: | Mar 1, 2005 |
41452 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | Yes, Manual Scram |
Before | Power Operation (15 %) |
After | Hot Standby (0 %) |
WEEKMONTHYEARENS 572332024-07-18T19:24:00018 July 2024 19:24:00
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