ENS 40858: Difference between revisions

v t e ENS Event
03:32 Jul 9, 2004
Title	Reactor Scram Due to a Turbine Generator Load Rejection Signal
Event Description	The following information was received from the licensee via facsimile: On 7/08/2004 at approximately 2232 hours0.0258 days <br />0.62 hours <br />0.00369 weeks <br />8.49276e-4 months <br /> CDT, Browns Ferry Unit 2 scrammed due to a Turbine Generator Load Reject Signal. All systems responded as required to the scram signal. No ECCS initiations occurred as a result of this event. Reactor Water Level lowered to the Low Level setpoint which generated a redundant SCRAM signal and initiated the Primary Containment Isolation System (PCIS) function for PCIS groups 2 (Primary Containment), 3 (RWCU) [Reactor Water Clean Up], 6 (Secondary Containment), and 8 (TIP system) [Transverse Incore Probe]. As expected, Main Steam Relief Valves (MSRVs) opened due to the high reactor pressure (maximum value observed was 1137 psig) as a result of the Main Turbine / Generator Trip. Reactor Water level was restored to normal via the Reactor Feedwater system and all PCIS isolations have been reset. The cause of the Load Reject Signal is still under investigation at this time. This event is reportable under 10CFR50.72(b)(2)(iv)(B), 'Any event or condition that results in a valid actuation of the Reactor Protection System (RPS) when the reactor is critical' and also under 10CFR50.72(b)(3)(iv)(A), 'Any event or condition that results in a valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B)'. This event also requires a 60 day written report in accordance with 10CFR50.73(a)(2)(iv)(A). All control rods inserted during the scram. All Main Steam Relief Valves have properly reset. Decay heat is being removed from the reactor via main turbine bypass valves to the main condenser. Pressure is being maintained at normal operating pressure. The electrical grid is stable. Unit 3 was not affected by the scram on Unit 2. The licensee has notified the NRC Resident Inspector.

ENS 40858 +/-
Where
Browns Ferry Alabama (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+-1.18 h-0.0492 days <br />-0.00702 weeks <br />-0.00162 months <br />)
Opened:	Chris Vaughn 02:21 Jul 9, 2004
NRC Officer:	Howie Crouch
Last Updated:	Jul 9, 2004
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v • d • e

v t e Emergency Notification System
Browns Ferry with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2024-08-30T15:51:00 [Table view]
[ENS list for Browns Ferry]

@@ Line 16: / Line 16: @@
 | event date = 07/08/2004 22:32 CDT
 | last update date = 07/09/2004
-| title = Reactor Scram Due To A Turbine Generator Load Rejection Signal
+| title = Reactor Scram Due to a Turbine Generator Load Rejection Signal
 | event text = The following information was received from the licensee via facsimile:
 On 7/08/2004 at approximately 2232 hours CDT, Browns Ferry Unit 2 scrammed due to a Turbine Generator Load Reject Signal.  All systems responded as required to the scram signal.  No ECCS initiations occurred as a result of this event.  Reactor Water Level lowered to the Low Level setpoint which generated a redundant SCRAM signal and initiated the Primary Containment Isolation System (PCIS) function for PCIS groups 2 (Primary Containment), 3 (RWCU) [Reactor Water Clean Up], 6 (Secondary Containment), and 8 (TIP system) [Transverse Incore Probe].  As expected, Main Steam Relief Valves (MSRVs) opened due to the high reactor pressure (maximum value observed was 1137 psig) as a result of the Main Turbine / Generator Trip.  Reactor Water level was restored to normal via the Reactor Feedwater system and all PCIS isolations have been reset.  The cause of the Load Reject Signal is still under investigation at this time.

v t e Unit 2
GE-4
Reactor critical	Critical
Scram	A/R
Before	Power Operation (100 %)
After	Hot Shutdown (0 %)

ENS 40858: Difference between revisions

Latest revision as of 21:23, 1 March 2018

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ENS 40858: Difference between revisions

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