So two scrams in three days. These guys got serious safety cultures problems and a very poor initial startup record...
Heading for a 95001?
Power
Reactor
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Event
Number: 52630
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Facility:
WATTS BAR
Region: 2 State: TN
Unit: [ ] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: DAMON FEGLEY
HQ OPS Officer: KARL DIEDERICH
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Notification
Date: 03/23/2017
Notification Time: 02:48 [ET]
Event Date: 03/23/2017
Event Time: 00:14 [EDT]
Last Update Date: 03/23/2017
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Emergency
Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
|
Person
(Organization):
MIKE ERNSTES (R2DO)
|
Unit
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SCRAM Code
|
RX CRIT
|
Initial PWR
|
Initial RX Mode
|
Current PWR
|
Current RX Mode
|
2
|
N
|
Y
|
16
|
Power Operation
|
3
|
Startup
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Event
Text
AUTOMATIC
START OF AUXILIARY FEED WATER
"On March 23, 2017, at 0014 EDT, Watts Bar Nuclear Plant Unit 2 (WBN2)
experienced an unplanned trip of both Turbine Driven Main Feed Pumps (TDMFP)
following a loss of Main Condenser Vacuum. The trip of both TDMFPs caused an
automatic start of both Motor Driven Auxiliary Feed Water Pumps and the
Turbine Driven Auxiliary Feed Water Pump. [The] cause of the loss of Main
Condenser Vacuum is currently under investigation."
The plant was performing a normal startup, and had just synced the main
generator to the grid. Subsequent to the event, the plant was transitioned to
Mode 3 by inserting all rods with a manual trip. Decay heat is being removed
via the atmospheric relief valves.
Unit 1 remains in Mode 5 for a refueling outage.
The licensee has notified the NRC Resident Inspector.
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Power
Reactor
|
Event
Number: 52625
|
Facility:
WATTS BAR
Region: 2 State: TN
Unit: [ ] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: JOHN TUITE
HQ OPS Officer: NESTOR MAKRIS
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Notification
Date: 03/20/2017
Notification Time: 10:17 [ET]
Event Date: 03/20/2017
Event Time: 08:13 [EDT]
Last Update Date: 03/20/2017
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Emergency
Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
|
Person
(Organization):
MIKE ERNSTES (R2DO)
|
Unit
|
SCRAM Code
|
RX CRIT
|
Initial PWR
|
Initial RX Mode
|
Current PWR
|
Current RX Mode
|
2
|
M/R
|
Y
|
91
|
Power Operation
|
0
|
Hot Standby
|
Event
Text
MANUAL
REACTOR TRIP AS A RESULT OF SECONDARY PLANT TRANSIENT
"On March 20, 2017 at 0813 EDT, Watts Bar Nuclear Plant (WBN) Unit 2
operations personnel manually tripped the plant from approximately 91 percent
power based on lowering steam generator levels. Prior to the plant trip, the
2A Hotwell pump tripped at 0758 EDT and the 2C Condensate Booster Pump
subsequently tripped at 0802 EDT. Operations personnel commenced to lower
plant power after the 2A Hotwell pump trip in an attempt to maintain steam
generator levels, but were unable to recover level and manually tripped the
unit.
"All control rods fully inserted and all automatically actuated safety
related equipment operated as designed. At 0905 EDT, operations personnel
exited the emergency operating instructions after the plant was stabilized.
The cause of the event is under investigation.
"This event is reportable to the NRC within four hours under 10 CFR
50.72(b)(2)(iv)(B) as a result of the actuation of the Reactor Protection
System and in eight hours under 10 CFR 50.72(b)(3)(iv)(A) as a result of
actuation of the Auxiliary Feedwater system.
"The licensee notified the NRC Resident Inspector."
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