ENS 44925
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ENS Event | |
|---|---|
09:06 Mar 21, 2009 | |
| Title | Unexpected Logic Lockout of Division I Rhr During Surveillance Testing |
| Event Description | Operations was performing 1-SR-3.3.5.1.6(BI), Functional Testing of RHR Loop I Pump and Minimum Flow Valve Logic, which rendered Division I of RHR INOPERABLE. While placing a jumper in accordance with procedural direction. Unit 1 received RHR Pump Initiate Lockout amber lights 1-IL-74-28 and 1-IL-74-39 for 1B and 1D RHR pumps (Division II). This was immediately recognized as being unexpected and action was taken to restore the 1B and 1D RHR pump auto start capability. The 1B and 1D RHR pumps were prevented from auto starting for approximately 1 minute. The Logic functioned as designed; however, this condition was caused by a procedure error. Entered TS LCO 3.0.3 based on TS LCO 3.5.1 Condition H - Two or more Low pressure ECCS injection/spray subsystems inoperable for reasons other than Condition A. TS 3.0.3 was exited after approximately one minute when the auto start capability of 1B and 1D RHR pumps was restored. 1B and 1D RHR pumps were available for manual initiation and remained OPERABLE for Containment Cooling and Shut Down Cooling Functions.
This event is reportable within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> per 10CFR 50.72(b)(3)(v)(D) 'any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to mitigate the consequences of an accident.' The NRC resident inspector has been notified. At 0407, the condition requiring this report was removed and safety function capability was restored. |
| 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:+2.73 h0.114 days <br />0.0162 weeks <br />0.00374 months <br />) | |
| Opened: | Michael D. Hunter 11:50 Mar 21, 2009 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Mar 21, 2009 |
| 44925 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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