ENS 40868: Difference between revisions

v t e ENS Event
21:10 Jul 13, 2004
Title	Automatic Reactor Scram Due to Possible Adverse Weather
Event Description	On July 13, 2004 at 1610 CDT, the Clinton Power Station 345 KV unit output breakers GCB 4506 and 4510 opened resulting in a turbine control valve fast closure. This caused a reactor protection system actuation and reactor scram. Clinton was in Mode 1, operating at 95% rated thermal power when the event occurred. A tornado warning was in effect at the time of the event and weather conditions were degrading in the area surrounding the plant. The exact cause of the trip of the unit breakers is not yet known. All systems responded as expected following the scram with the exception of Reactor Recirculation pump A which tripped off instead of downshifting to slow speed on a reactor water level 3 signal. The unit is currently in Mode 3 with reactor pressure vessel level and pressure in their normal bands. Recirculation Pump "A" remains secured until the licensee completes their investigation. All control rods fully inserted following the scram. The Main Condenser is in service removing decay heat. All ECCS equipment including the EDGs are available, if needed. The licensee informed the NRC Resident Inspector.

ENS 40868 +/-
Where
Clinton Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation
Time - Person (Reporting Time:+-2.22 h-0.0925 days <br />-0.0132 weeks <br />-0.00304 months <br />)
Opened:	Pat Ryan 18:57 Jul 13, 2004
NRC Officer:	Steve Sandin
Last Updated:	Jul 13, 2004
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v • d • e

v t e Emergency Notification System
Clinton with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation
WEEKMONTHYEAR2023-02-01T05:43:00 [Table view]
[ENS list for Clinton]

@@ Line 16: / Line 16: @@
 | event date = 07/13/2004 16:10 CDT
 | last update date = 07/13/2004
-| title = Automatic Reactor Scram Due To Possible Adverse Weather
+| title = Automatic Reactor Scram Due to Possible Adverse Weather
 | event text = On July 13, 2004 at 1610 CDT, the Clinton Power Station 345 KV unit output breakers GCB 4506 and 4510 opened resulting in a turbine control valve fast closure. This caused a reactor protection system actuation and reactor scram. Clinton was in Mode 1, operating at 95% rated thermal power when the event occurred. A tornado warning was in effect at the time of the event and weather conditions were degrading in the area surrounding the plant. The exact cause of the trip of the unit breakers is not yet known.
 All systems responded as expected following the scram with the exception of Reactor Recirculation pump A which tripped off instead of downshifting to slow speed on a reactor water level 3 signal.

Latest revision as of 22:23, 1 March 2018