ENS 52425: Difference between revisions

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| event date = 12/10/2016 08:48 EST
| event date = 12/10/2016 08:48 EST
| last update date = 12/10/2016
| last update date = 12/10/2016
| title = Manual Reactor Scram Due To High Main Turbine Vibrations
| title = Manual Reactor Scram Due to High Main Turbine Vibrations
| event text = On December 10, 2016 at 0848 EST, [operators at] Nine Mile Point Unit 1 manually scrammed the reactor due to high vibrations on the Main Turbine. Cause of the high vibrations is being investigated.
| event text = On December 10, 2016 at 0848 EST, [operators at] Nine Mile Point Unit 1 manually scrammed the reactor due to high vibrations on the Main Turbine. Cause of the high vibrations is being investigated.
Following the scram, the High Pressure Coolant Injection (HPCI) system automatically initiated as expected. At Nine Mile Point Unit 1, a HPCI system actuation signal on low reactor pressure vessel (RPV) level is normally received following a reactor scram, due to level shrink. HPCI is a flow control mode of the normal feedwater system and is not an emergency core cooling system. At 0849, RPV level was restored above the HPCI system low level actuation set point and the HPCI system initiation signal was reset. Pressure control was established on the turbine bypass valves, the preferred system. No Electromatic relief valves actuated due to this scram.
Following the scram, the High Pressure Coolant Injection (HPCI) system automatically initiated as expected. At Nine Mile Point Unit 1, a HPCI system actuation signal on low reactor pressure vessel (RPV) level is normally received following a reactor scram, due to level shrink. HPCI is a flow control mode of the normal feedwater system and is not an emergency core cooling system. At 0849, RPV level was restored above the HPCI system low level actuation set point and the HPCI system initiation signal was reset. Pressure control was established on the turbine bypass valves, the preferred system. No Electromatic relief valves actuated due to this scram.

Latest revision as of 20:43, 1 March 2018

ENS 52425 +/-
Where
Nine Mile Point Constellation icon.png
New York (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: 05000220/LER-2017-001
Time - Person (Reporting Time:+-1.28 h-0.0533 days <br />-0.00762 weeks <br />-0.00175 months <br />)
Opened: Benjamin Ariola
12:31 Dec 10, 2016
NRC Officer: Howie Crouch
Last Updated: Dec 10, 2016
52425 - NRC Website
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