ENS Event | |
|---|---|
16:30 Aug 10, 2012 | |
| Title | Flood Barrier Seals Could Not Be Verified Installed |
| Event Description | On August 10, 2012 during an inspection in the Air Intake Tunnel, six 4-inch conduits that carry cabling from yard vaults through the Air Intake Tunnel (AIT) to the Auxiliary Building (AB) were inspected for flood seals. This was done by opening the conduit seals bottom drain openings to inspect the condition by boroscope. These seal components are just inside the AIT from the electrical vaults. During the inspections no sealant could be readily identified. Each conduit from the yard vaults that is not sealed could potentially provide a leak path during flood conditions from the yard vaults to the Auxiliary Building via the electrical conduit. Flood water entering the Auxiliary Building could impact the decay heat removal function.
This is reportable as an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> ENS notification under 10CFR50.72(b)(3)(v)(B) and 10CFR50.72(a)(1)(ii) as a condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to remove residual heat. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Three Mile Island  Pennsylvania (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| LER: | 05000289/LER-2012-002 |
| Time - Person (Reporting Time:+3.23 h0.135 days <br />0.0192 weeks <br />0.00442 months <br />) | |
| Opened: | Jason Harner 19:44 Aug 10, 2012 |
| NRC Officer: | John Knoke |
| Last Updated: | Aug 10, 2012 |
| 48179 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 481792012-08-10T16:30:00010 August 2012 16:30:00
[Table view]10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Flood Barrier Seals Could Not Be Verified Installed ENS 461942010-08-21T15:00:00021 August 2010 15:00:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Flood Barriers Needed to Protect Safety Related Equipment Missing ENS 454642009-10-23T21:41:00023 October 2009 21:41:00 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat Steam Generator Safety Relief Valves Did Not Open at Required Setpoint 2012-08-10T16:30:00 | |