ENS 51720: Difference between revisions

v t e ENS Event
19:15 Feb 9, 2016
Title	Eccs Discharge to Rcs Via Charging System
Event Description	At 1415 EST on 02/09/2016, Sequoyah Unit 1 was at 0 percent power (mode 3, 526F, 2235 psig) when a low steam line pressure Safety Injection actuated from Loop 2 Steam Generator. Prior to this event, the Loop 2 Main Steam Isolation Valve bypass was opened at 1413 EST for main steam line warm up in preparation for unit startup. Loop 2 Main Steam Isolation Valve bypass closed automatically following low steam line pressure Safety Injection. Following the Safety Injection, all safety-related equipment operated as designed. Current Reactor Coolant System temperature and pressure - Unit 1 is currently being maintained in Mode 3 at approximately 517 F and 2235 psig, with auxiliary feedwater supplying the steam generators and decay heat removal via steam generator atmospheric relief valves. There is no indication of any primary to secondary leakage. The electrical alignment is normal with shutdown power supplied from off-site power. There is no operational impact to Unit 2. The cause of the Safety Injection actuation is under investigation. This event had no impact on the health and/or safety of the public. The NRC Resident Inspector has been notified. Due to RCS pressure, the only system that injected into the RCS was the charging system. The AFW system initiated to feed the steam generators and the Emergency Diesel Generators started but did not load.

ENS 51720 +/-
Where
Sequoyah Tennessee (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+-1.83 h-0.0763 days <br />-0.0109 weeks <br />-0.00251 months <br />)
Opened:	Bruce Buch 17:25 Feb 9, 2016
NRC Officer:	Jeff Rotton
Last Updated:	Feb 9, 2016
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v • d • e

v t e Emergency Notification System
Sequoyah with 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(iv)(A), System Actuation - ECCS Discharge
WEEKMONTHYEAR2024-08-23T16:19:00 [Table view]
[ENS list for Sequoyah]

@@ Line 16: / Line 16: @@
 | event date = 02/09/2016 14:15 EST
 | last update date = 02/09/2016
-| title = Eccs Discharge To Rcs Via Charging System
+| title = Eccs Discharge to Rcs Via Charging System
 | event text = At 1415 EST on 02/09/2016, Sequoyah Unit 1 was at 0 percent power (mode 3, 526F, 2235 psig) when a low steam line pressure Safety Injection actuated from Loop 2 Steam Generator.  Prior to this event, the Loop 2 Main Steam Isolation Valve bypass was opened at 1413 EST for main steam line warm up in preparation for unit startup.  Loop 2 Main Steam Isolation Valve bypass closed automatically following low steam line pressure Safety Injection.
 Following the Safety Injection, all safety-related equipment operated as designed.

Latest revision as of 21:45, 1 March 2018