Event Notification Report for February 20, 2005
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/19/2005 - 02/20/2005
EVENT NUMBERS
41425
Power Reactor
Event Number: 41425
Facility: KEWAUNEE
Region: 3 State: WI
Unit: [1] [] []
RX Type: [1] W-2-LP
NRC Notified By: KENNETH RESSLER
HQ OPS Officer: MARK ABRAMOVITZ
Region: 3 State: WI
Unit: [1] [] []
RX Type: [1] W-2-LP
NRC Notified By: KENNETH RESSLER
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 02/20/2005
Notification Time: 16:37 [ET]
Event Date: 02/20/2005
Event Time: 11:58 [CST]
Last Update Date: 02/20/2005
Notification Time: 16:37 [ET]
Event Date: 02/20/2005
Event Time: 11:58 [CST]
Last Update Date: 02/20/2005
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
PATRICK LOUDEN (R3)
PATRICK LOUDEN (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Intermediate Shutdown | 0 | Intermediate Shutdown |
RPS ACTUATION ON STEAM GENERATOR LOW LEVEL
The following information was reported by fax:
"During a plant shutdown from 100% power due to the condition as discussed in previous event notice EN #41423, a valid actuation of the reactor protection system occurred. The plant was in the intermediate shutdown mode at approximately 510°F, using the S/G's to cool the Reactor Coolant System, S/G water level was being controlled with one Auxiliary Feedwater Pump and manual control of its outlet valve.
"Following the initiation of RCS cooldown, Steam Generator levels began to decrease. The operator began to throttle the operating AFW pump's outlet valve open, however at 1158 on 2/20/05, the Control Room received the Annunciator for S/G B Low-Low Water Reactor Trip, which has a setpoint of 2/3 S/G level channels <17% narrow range level. This caused a Reactor Trip signal to be initiated by the Reactor Protection System. The trip signal was generated, however the plant was already in a shutdown condition with the reactor trip breakers open."
"All systems were functioning normally. The operator started an additional AFW pump and, at 1206, normal level was restored to S/G B and the automatic Reactor Trip signal cleared."
The lowest level during this transient in Steam Generator B was 14.5% narrow range level.
The licensee notified the NRC Resident Inspector.
The following information was reported by fax:
"During a plant shutdown from 100% power due to the condition as discussed in previous event notice EN #41423, a valid actuation of the reactor protection system occurred. The plant was in the intermediate shutdown mode at approximately 510°F, using the S/G's to cool the Reactor Coolant System, S/G water level was being controlled with one Auxiliary Feedwater Pump and manual control of its outlet valve.
"Following the initiation of RCS cooldown, Steam Generator levels began to decrease. The operator began to throttle the operating AFW pump's outlet valve open, however at 1158 on 2/20/05, the Control Room received the Annunciator for S/G B Low-Low Water Reactor Trip, which has a setpoint of 2/3 S/G level channels <17% narrow range level. This caused a Reactor Trip signal to be initiated by the Reactor Protection System. The trip signal was generated, however the plant was already in a shutdown condition with the reactor trip breakers open."
"All systems were functioning normally. The operator started an additional AFW pump and, at 1206, normal level was restored to S/G B and the automatic Reactor Trip signal cleared."
The lowest level during this transient in Steam Generator B was 14.5% narrow range level.
The licensee notified the NRC Resident Inspector.