ENS Event | |
|---|---|
21:50 May 25, 2009 | |
| Title | Inoperable Rcic Primary Containment Isolation Valves |
| Event Description | The Reactor Core Isolation Cooling (RCIC) system tripped on high turbine exhaust discharge pressure during surveillance testing on May 24, 2009. Following the surveillance it was identified that the containment (torus) inboard stop check valve in the RCIC turbine exhaust line could not be closed, necessitating the shutdown of Unit 1 to perform repairs on this inboard isolation valve. At 1650 hours0.0191 days <br />0.458 hours <br />0.00273 weeks <br />6.27825e-4 months <br /> on May 25, 2009, with the unit shutdown, inspections revealed that the inboard isolation valve could not close due to [the presence of] valve material originating from the containment (torus) outboard swing check isolation valve in the turbine exhaust line. Given the inspection findings it has been concluded that neither the inboard stop check valve or the outboard swing check valve in the RCIC turbine exhaust line would have performed their primary containment isolation function while the unit was at power, [thus] impacting containment integrity. As a result, this event is being reported in accordance with 10 CFR 50.72 (b)(3)(ii) for a degraded or unanalyzed condition. The inboard and outboard containment isolation valves in the RCIC turbine exhaust line will be repaired prior to unit startup. The NRC Resident Inspector has been notified of this condition. |
| Where | |
|---|---|
Quad Cities  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+-0.3 h-0.0125 days <br />-0.00179 weeks <br />-4.1094e-4 months <br />) | |
| Opened: | Dave Geever 21:32 May 25, 2009 |
| NRC Officer: | John Knoke |
| Last Updated: | May 25, 2009 |
| 45092 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Cold Shutdown (0 %) |
| After | Cold Shutdown (0 %) |
WEEKMONTHYEARENS 532352018-03-01T18:10:0001 March 2018 18:10:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition En Revision Imported Date 11/8/2019 ENS 508822015-03-13T06:00:00013 March 2015 06:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Fuel Assembly Mis-Oriented Resulting in a Unanalyzed Condition ENS 450922009-05-25T21:50:00025 May 2009 21:50:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Inoperable Rcic Primary Containment Isolation Valves ENS 413692005-02-04T00:19:0004 February 2005 00:19:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 4160 Volt Relaying and Metering Single Failure Vulnerability 2018-03-01T18:10:00 | |