ENS 51830: Difference between revisions
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StriderTol (talk | contribs) Created page by program invented by Mark Hawes |
StriderTol (talk | contribs) Created page by program invented by StriderTol |
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| event date = 03/29/2016 22:56 EDT | | event date = 03/29/2016 22:56 EDT | ||
| last update date = 03/30/2016 | | last update date = 03/30/2016 | ||
| title = Loss | | title = Loss of Secondary Containment Differential Pressure | ||
| event text = On March 29, 2016 at 2256 [EDT], Secondary Containment Zone 2 (Unit 2 Reactor Building) differential pressure lowered to 0.0 [inches] WG [water gauge] due to a failed closed discharge damper on the in service Zone 2 exhaust fan. Required differential pressure per SR 3.6.4.1.1 could not be maintained. Zone 2 ventilation was restored by starting the standby Zone 2 exhaust fan. Zone 2 differential pressure recovered to [greater than] 0.25 [inches] WG at 2321 hours. Zone 3 (Unit 1&2 Reactor Buildings) ventilation remained in service and stable. Zone 1(Unit 1 Reactor Building) ventilation remained in service however it is not required in this mode of Operation. | | event text = On March 29, 2016 at 2256 [EDT], Secondary Containment Zone 2 (Unit 2 Reactor Building) differential pressure lowered to 0.0 [inches] WG [water gauge] due to a failed closed discharge damper on the in service Zone 2 exhaust fan. Required differential pressure per SR 3.6.4.1.1 could not be maintained. Zone 2 ventilation was restored by starting the standby Zone 2 exhaust fan. Zone 2 differential pressure recovered to [greater than] 0.25 [inches] WG at 2321 hours. Zone 3 (Unit 1&2 Reactor Buildings) ventilation remained in service and stable. Zone 1(Unit 1 Reactor Building) ventilation remained in service however it is not required in this mode of Operation. | ||
This event is being reported under 10 CFR 50.72(b)(3)(v)(C) and per the guidance of NUREG 1022 Rev 3 section 3.2.7 as a loss of a Safety Function. There is no redundant Susquehanna Secondary Containment System. | This event is being reported under 10 CFR 50.72(b)(3)(v)(C) and per the guidance of NUREG 1022 Rev 3 section 3.2.7 as a loss of a Safety Function. There is no redundant Susquehanna Secondary Containment System. | ||
Latest revision as of 20:45, 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 | |
| LER: | 05000387/LER-2016-012 Regarding Secondary Containment Declared Inoperable Due to Loss of Differential Pressure as a Result of a Solenoid Valve |
| Time - Person (Reporting Time:+-0.72 h-0.03 days <br />-0.00429 weeks <br />-9.86256e-4 months <br />) | |
| Opened: | Ronald Fry 02:13 Mar 30, 2016 |
| NRC Officer: | Dong Park |
| Last Updated: | Mar 30, 2016 |
| 51830 - NRC Website
| |
Susquehanna with 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |