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Event Notification Report for September 24, 2010

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
09/23/2010 - 09/24/2010

** EVENT NUMBERS **


46271 46274

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Power Reactor Event Number: 46271
Facility: PILGRIM
Region: 1 State: MA
Unit: [1] [ ] [ ]
RX Type: [1] GE-3
NRC Notified By: STAN PAUL
HQ OPS Officer: STEVE SANDIN
Notification Date: 09/23/2010
Notification Time: 06:03 [ET]
Event Date: 09/23/2010
Event Time: 06:00 [EDT]
Last Update Date: 09/23/2010
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
GLENN DENTEL (R1DO)

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

Event Text

LOSS OF EMERGENCY RESPONSE CAPABILITY - TSC/OSC IS UNAVAILABLE

"Unavailability of TSC/OSC Ventilation System Due to Scheduled Maintenance.

"At 0600 [EDT] on Thursday, September 23, 2010, the Pilgrim Nuclear Power Station (PNPS) Technical Support Center (TSC) / Operations Support Center (OSC) emergency ventilation system was removed from service for planned maintenance. The balance of the TSC/OSC ventilation is not affected by the maintenance and remains available.

"Under certain accident conditions the TSC/OSC may become unavailable due to inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC/OSC personnel to the Emergency Offsite Facility (EOF) and to the Control Room. In the event of a declared emergency, all OSC personnel will report to the Control Room Annex. TSC minimum staffing will report to the Control Room and all other TSC staff will report to the EOF.

"The maintenance is scheduled to be completed by 1900 hours on Thursday September 23, 2010.

"The licensee has notified the NRC Senior Resident Inspector.

"This notification is being made in accordance with 10 CFR 50.72 (b) (3) (xiii) due to the loss of an emergency response facility."

The licensee also informed the Commonwealth of Massachusetts.

* * * UPDATE ON 9/23/2010 AT 1625 FROM MERT TROBASCO TO MARK ABRAMOVITZ * * *

TSC/OSC ventilation was restored to operable status at 1600 EDT. The licensee notified the NRC Resident Inspector.

Notified the R1DO (Dentel).

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Power Reactor Event Number: 46274
Facility: TURKEY POINT
Region: 2 State: FL
Unit: [3] [ ] [ ]
RX Type: [3] W-3-LP,[4] W-3-LP
NRC Notified By: MIKE HOUGH
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 09/23/2010
Notification Time: 17:52 [ET]
Event Date: 09/23/2010
Event Time: 17:14 [EDT]
Last Update Date: 09/23/2010
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):
GEORGE HOPPER (R2DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
3 A/R Y 100 Power Operation 0 Hot Standby

Event Text

REACTOR TRIP DUE TO INADVERTENT ENERGIZATION GENERATOR TRIP

"Unit 3 reactor and turbine tripped due to Inadvertent Energization Generator Trip. All systems functioned as normal with the exception of Control Rod G5 in Control Bank A which remains at 18 steps. Entered and exited E-0 Reactor Trip and entered ES-0.1 Reactor Trip Response. All 4kV buses have power from the Unit 3 Start Up Transformer."

Heavy weather conditions existed at the time of the reactor trip and is suspected as the cause for the Inadvertent Energization Generator Trip. Aux feed initiated during the trip recovery due to low steam generator level. Decay heat is being removed using condenser steam dumps and atmospheric steam dumps. There is no primary to secondary leakage. The plant is in its normal shutdown electrical lineup. There was no affect on unit-4 which is shutdown.

The licensee will notify the NRC Resident Inspector.

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