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Event Notification Report for December 30, 2004

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
12/29/2004 - 12/30/2004

** EVENT NUMBERS **


41298 41299

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Power Reactor Event Number: 41298
Facility: TURKEY POINT
Region: 2 State: FL
Unit: [3] [ ] [ ]
RX Type: [3] W-3-LP,[4] W-3-LP
NRC Notified By: PAUL REIMERS
HQ OPS Officer: HOWIE CROUCH
Notification Date: 12/28/2004
Notification Time: 23:51 [ET]
Event Date: 12/28/2004
Event Time: 22:46 [EST]
Last Update Date: 12/29/2004
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):
JAMES MOORMAN (R2)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
3 M/R Y 70 Power Operation 0 Hot Standby

Event Text

MANUAL REACTOR TRIP DUE TO GENERATOR EXCITER COOLING WATER LEAK

"Unit 3 unplanned Manual Reactor trip from 70% due to Generator Exciter cooling water leak. Leak caused voltage regulator transfer to manual. Cooling water leak was isolated after the manual reactor trip. Water was noted in the 3B 4kv safety related bus room affecting 3B Residual Heat Removal Pump breaker. This component is considered inoperable pending corrective action. Plant is stable in mode 3.

"Auxiliary Feed Water actuated automatically, as expected, and operated normally following the reactor trip."

All control rods fully inserted. The MSIV's were manually closed to prevent excessive RCS cooldown and decay heat is being removed via the atmospheric steam dumps. Unit 4 was unaffected. The licensee will notify the NRC Resident Inspector.

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Power Reactor Event Number: 41299
Facility: BYRON
Region: 3 State: IL
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: TOM CONBOY
HQ OPS Officer: JOHN MacKINNON
Notification Date: 12/29/2004
Notification Time: 16:37 [ET]
Event Date: 12/29/2004
Event Time: 14:00 [CST]
Last Update Date: 12/29/2004
Emergency Class: NON EMERGENCY
10 CFR Section:
INFORMATION ONLY
Person (Organization):
CHRISTINE LIPA (R3)
PATRICK HILAND (NRR)
HO NIEH (IRD)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

LOSS OF COMMUNICATIONS TO SITE DUE TO FIBER OPTIC LINE CUT

At approximately 1400 CST all commercial and FTS 2000 telephone communications to and from Byron Station was lost due to a fiber optic cable cut 20 miles North of the plant, near Rockford, Il. Licensee can contact the NRC Headquarters Operation Officer via a Control Room cell phone. NRC Headquarters Operation Officer is unable to call the site using the cell phone because incoming calls are routed through Rockford, Il. Licensee stated that the line problem is being worked on.

NRC Resident Inspector has been notified of this event by the licensee.


* * * Update 12/29/04 at 2139 EST by Koeplin to MacKinnon * * *

Commercial and FTS telephone service returned to service. Licensee will notified the NRC Resident Inspector. R3DO (C. Lipa) & NRR EO (Pat Hiland) notified.

Page Last Reviewed/Updated Friday, March 30, 2012
Friday, March 30, 2012