Event Notification Report for February 26, 2012
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/25/2012 - 02/26/2012
EVENT NUMBERS
47699
Power Reactor
Event Number: 47699
Facility: CALVERT CLIFFS
Region: 1 State: MD
Unit: [1] [2] []
RX Type: [1] CE,[2] CE
NRC Notified By: KENT MILLS
HQ OPS Officer: VINCE KLCO
Region: 1 State: MD
Unit: [1] [2] []
RX Type: [1] CE,[2] CE
NRC Notified By: KENT MILLS
HQ OPS Officer: VINCE KLCO
Notification Date: 02/26/2012
Notification Time: 20:15 [ET]
Event Date: 02/26/2012
Event Time: 15:46 [EST]
Last Update Date: 03/01/2012
Notification Time: 20:15 [ET]
Event Date: 02/26/2012
Event Time: 15:46 [EST]
Last Update Date: 03/01/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
MEL GRAY (R1DO)
MEL GRAY (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 0 | Refueling |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
LOSS OF PLANT ASSESSMENT CAPABILITIES DUE TO AN OUT OF SERVICE PLANT PROCESS COMPUTER
"Calvert Cliffs will be performing planned maintenance to the U-1 Plant Process Computer to install isolation transformers. This maintenance window was expected to start at 2100 [EST] today, 2/26/2012, but the U-1 Plant Process Computer failed at 1546 this afternoon and it was decided to commence the planned maintenance window at that time versus spending resources to attempt recovery of the computer for just a short time period. The planned maintenance window is expected to be 54 hours long and end February 28, around 2300. This will impact the Unit 1 data dissemination to the Safety Parameter Display System (SPDS), TSC Computer. PI [Plant Trending Software] and ERDS will also be out of service for both Unit-1 and Unit-2. Should an emergency be declared during this period, the Control Room will continue to have the capability to retrieve plant data inputs to assess plant conditions and perform core damage assessment. Control Room Emergency Response Organization personnel will use backup methods already captured in emergency response procedures to disseminate plant parameter data to the effected Emergency Response Facilities and NRC during the plant data network outage. MIDAS (Meteorological Data) will continue to be operational at the site.
"Applicable Reporting Requirement: 10 CFR 50.72 (b) (3) (xiii); 8 Hour report."
The licensee notified the NRC Resident Inspector.
* * * UPDATE AT 1209 EST ON 03/01/12 FROM JAY GAINES TO S. SANDIN * * *
"At 1000 [EST] this morning planned maintenance was completed to the Unit 1 plant process computer. All plant assessment capabilities have been restored."
The licensee informed the NRC Resident Inspector. Notified R1DO (Ferdas).
"Calvert Cliffs will be performing planned maintenance to the U-1 Plant Process Computer to install isolation transformers. This maintenance window was expected to start at 2100 [EST] today, 2/26/2012, but the U-1 Plant Process Computer failed at 1546 this afternoon and it was decided to commence the planned maintenance window at that time versus spending resources to attempt recovery of the computer for just a short time period. The planned maintenance window is expected to be 54 hours long and end February 28, around 2300. This will impact the Unit 1 data dissemination to the Safety Parameter Display System (SPDS), TSC Computer. PI [Plant Trending Software] and ERDS will also be out of service for both Unit-1 and Unit-2. Should an emergency be declared during this period, the Control Room will continue to have the capability to retrieve plant data inputs to assess plant conditions and perform core damage assessment. Control Room Emergency Response Organization personnel will use backup methods already captured in emergency response procedures to disseminate plant parameter data to the effected Emergency Response Facilities and NRC during the plant data network outage. MIDAS (Meteorological Data) will continue to be operational at the site.
"Applicable Reporting Requirement: 10 CFR 50.72 (b) (3) (xiii); 8 Hour report."
The licensee notified the NRC Resident Inspector.
* * * UPDATE AT 1209 EST ON 03/01/12 FROM JAY GAINES TO S. SANDIN * * *
"At 1000 [EST] this morning planned maintenance was completed to the Unit 1 plant process computer. All plant assessment capabilities have been restored."
The licensee informed the NRC Resident Inspector. Notified R1DO (Ferdas).