ENS 47699: Difference between revisions
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| event date = 02/26/2012 15:46 EST | | event date = 02/26/2012 15:46 EST | ||
| last update date = 03/01/2012 | | last update date = 03/01/2012 | ||
| title = Loss | | title = Loss of Plant Assessment Capabilities Due to an Out of Service Plant Process Computer | ||
| event text = 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. | | event text = 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. | Applicable Reporting Requirement: 10 CFR 50.72 (b) (3) (xiii); 8 Hour report. | ||
Latest revision as of 22:04, 1 March 2018
| Where | |
|---|---|
Calvert Cliffs  Maryland (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | |
| Time - Person (Reporting Time:+-0.52 h-0.0217 days <br />-0.0031 weeks <br />-7.12296e-4 months <br />) | |
| Opened: | Kent Mills 20:15 Feb 26, 2012 |
| NRC Officer: | Vince Klco |
| Last Updated: | Mar 1, 2012 |
| 47699 - NRC Website
| |