ENS 48656
ENS Event | |
|---|---|
22:27 Jan 7, 2013 | |
| Title | Secondary Containment Momentarily Inoperable |
| Event Description | Technical Specification 3.6.4.1 (Secondary Containment) requires that the secondary containment be operable. Surveillance requirement 3.6.4.1.3 requires verifying each secondary containment access inner door or each secondary containment access outer door in each access opening is closed.
Maintenance personnel were moving scaffolding through Reactor Building outer security door (R-304) when an equipment operator opened inner door (R-305) to exit the Reactor Building. This resulted in both the Reactor Building inner and outer access doors being simultaneously open for a short duration. Normally, the doors are interlocked in which the inner door would not be able to be opened prior to the outer security door being closed. The equipment operator immediately closed the door and notified the Main Control Room. The outer security door (R-304) has been key-locked closed, until corrective actions can be determined. Columbia Generating Station is investigating why the interlock feature failed. There were no radiological releases associated with this event. No safety system actuations or isolations occurred. The licensee has notified the NRC Resident Inspector. Note: See similar event reported by licensee on 12/30/12, EN #48639, involving containment door interlock failure on doors R-204 and R-205. |
| Where | |
|---|---|
Columbia Generating Station  Washington (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000397/LER-2013-001 |
| Time - Person (Reporting Time:+-2.97 h-0.124 days <br />-0.0177 weeks <br />-0.00407 months <br />) | |
| Opened: | Ryan Oakes 19:29 Jan 7, 2013 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Jan 7, 2013 |
| 48656 - NRC Website | |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |