ENS 52517: Difference between revisions
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| event date = 01/29/2017 02:09 CST | | event date = 01/29/2017 02:09 CST | ||
| last update date = 01/29/2017 | | last update date = 01/29/2017 | ||
| title = Loss | | title = Loss of Both Divisions of Control Building Chill Water and Ventilation System | ||
| event text = At 0209 CST, on January 29, 2017, while the plant was in MODE 4 for a refueling outage, the main control room crew removed the AC/DC inverter in the Division 1, 120 VAC electrical distribution system from service due to an equipment malfunction. Removing the inverter from service caused a loss of the associated 120 VAC instrument buss. This instrument buss loss caused a trip of the Division 1 Control Building Chill Water and Ventilation system. The Division 2 Control Building Chill Water and Ventilation System was locked out for surveillance testing at the time of the equipment failure. This condition rendered both divisions of Control Building Chill Water and Ventilation Systems unable to perform the support function for cooling Division 1 and 2 AC and DC power distribution systems. These systems are required to support the operability of two required divisions of shutdown cooling. Division 2 Shutdown Cooling System was in service and remained in service through out the event. | | event text = At 0209 CST, on January 29, 2017, while the plant was in MODE 4 for a refueling outage, the main control room crew removed the AC/DC inverter in the Division 1, 120 VAC electrical distribution system from service due to an equipment malfunction. Removing the inverter from service caused a loss of the associated 120 VAC instrument buss. This instrument buss loss caused a trip of the Division 1 Control Building Chill Water and Ventilation system. The Division 2 Control Building Chill Water and Ventilation System was locked out for surveillance testing at the time of the equipment failure. This condition rendered both divisions of Control Building Chill Water and Ventilation Systems unable to perform the support function for cooling Division 1 and 2 AC and DC power distribution systems. These systems are required to support the operability of two required divisions of shutdown cooling. Division 2 Shutdown Cooling System was in service and remained in service through out the event. | ||
The Division 2 Control Building Chill Water and Ventilation System was returned to service at 0220 CST on January 29, 2017. | The Division 2 Control Building Chill Water and Ventilation System was returned to service at 0220 CST on January 29, 2017. | ||
Latest revision as of 20:41, 1 March 2018
| Where | |
|---|---|
River Bend  Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| Time - Person (Reporting Time:+8.35 h0.348 days <br />0.0497 weeks <br />0.0114 months <br />) | |
| Opened: | Steven Carter 16:30 Jan 29, 2017 |
| NRC Officer: | Dong Park |
| Last Updated: | Jan 29, 2017 |
| 52517 - NRC Website
| |