ENS 49208
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ENS Event | |
|---|---|
09:38 Jul 20, 2013 | |
| Title | Hpci System Declared Inoperable |
| Event Description | During performance of 1-SR-3.3.5.1.3(D), 'High Pressure Coolant Injection System Condensate Header Low Level Switch Calibration and Functional Test,' the High Pressure Coolant Injection (HPCI) system was declared inoperable due to exceeding the allotted 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> time frame for instrument inoperability of 1-LS-073-0056A and 1-LS-073-0056B [low condensate storage tank (CST) level HPCI suction transfer switches]. The HPCI system was declared inoperable in accordance with technical specification (TS) 3.3.5.1 Condition D.1. Condition D of TS 3.3.5.1 is required to be entered during performance of this surveillance. The surveillance disables the automatic CST to Torus suction path transfer function of the HPCI system by booting relay contacts in order to perform a functional test of referenced switches. The 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> completion time of TS 3.3.5.1 required by action D.1 was exceeded due to issues with associated test equipment. This constitutes an unplanned HPCI system inoperability and requires an 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> NRC notification per 10CFR50.72(b)(3)(v)(D). HPCI remained available for automatic and manual injection during this time period.
The HPCI system was declared inoperable at 0438 CDT on 7/20/13 and operability (CST to Torus suction transfer function) was restored at 0454 CDT on 7/20/13. The NRC resident inspector has been notified. The level switches (suction transfer switches) had been taken out-of-service for calibration and testing at 0338 CDT on 7/20/13. |
| Where | |
|---|---|
Browns Ferry  Alabama (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+3.3 h0.138 days <br />0.0196 weeks <br />0.00452 months <br />) | |
| Opened: | Todd Christensen 12:56 Jul 20, 2013 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Jul 20, 2013 |
| 49208 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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