ENS 50055: Difference between revisions
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| event date = 04/24/2014 02:30 EDT | | event date = 04/24/2014 02:30 EDT | ||
| last update date = 04/24/2014 | | last update date = 04/24/2014 | ||
| title = Loss | | title = Loss of Secondary Containment During Routine Swap of a Power Supplies | ||
| event text = On April 24, 2014 at 0230 [EDT], Secondary Containment Zone 3 (Unit 1&2 Reactor Building) differential pressure lowered to 0.10 [negative inches] WG [Water Gauge] when restoring Unit 1 Zone 3 HVAC during a routine swap of RPS power supplies, due to a trip of the Unit 1 Zone 3 Supply fan. Zone 3 differential pressure was restored to > 0.25 [negative inches] WG at 0243 hours. Zone I (Unit 1 Reactor Building) ventilation is isolated with secondary containment relaxed for refuel outage on Unit 1. Zone II (Unit 2 Reactor Building) ventilation remained in service and stable. | | event text = On April 24, 2014 at 0230 [EDT], Secondary Containment Zone 3 (Unit 1&2 Reactor Building) differential pressure lowered to 0.10 [negative inches] WG [Water Gauge] when restoring Unit 1 Zone 3 HVAC during a routine swap of RPS power supplies, due to a trip of the Unit 1 Zone 3 Supply fan. Zone 3 differential pressure was restored to > 0.25 [negative inches] WG at 0243 hours. Zone I (Unit 1 Reactor Building) ventilation is isolated with secondary containment relaxed for refuel outage on Unit 1. Zone II (Unit 2 Reactor Building) ventilation remained in service and stable. | ||
Zone 3 differential pressure recovered to SR 3.6.4.1.1 requirements of 0.25 WG [negative inches] at 0243 hours and was verified to be stable. LCO 3.6.4.1 was entered at 0230 hours and exited at 0313 hours. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 [negative inches] WG for all three Reactor Building Ventilation Zones when secondary containment is required. | Zone 3 differential pressure recovered to SR 3.6.4.1.1 requirements of 0.25 WG [negative inches] at 0243 hours and was verified to be stable. LCO 3.6.4.1 was entered at 0230 hours and exited at 0313 hours. Tech Spec Secondary Containment Operability requires a negative pressure of at least 0.25 [negative inches] WG for all three Reactor Building Ventilation Zones when secondary containment is required. | ||
Latest revision as of 20:50, 1 March 2018
| Where | |
|---|---|
Susquehanna  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+1.33 h0.0554 days <br />0.00792 weeks <br />0.00182 months <br />) | |
| Opened: | Martin Lichtner 07:50 Apr 24, 2014 |
| NRC Officer: | Vince Klco |
| Last Updated: | Apr 24, 2014 |
| 50055 - NRC Website
| |
Susquehanna with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |