ENS 40912
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ENS Event | |
|---|---|
02:25 Jul 31, 2004 | |
| Title | Lpci Loop Select Logic Found Degraded Due to Pressure Instruments Out-Of-Tolerance |
| Event Description | On July 30, 2004 at approximately 2125 hours0.0246 days <br />0.59 hours <br />0.00351 weeks <br />8.085625e-4 months <br /> CDT, Instrument Maintenance personnel were performing the Unit One Reactor Low Pressure (RHR/LPCI) Calibration and Functional Test. At this time, the technicians determined that two out of the four "Reactor Steam Dome Pressure - Low" switches in LPCI loop select logic were out of tolerance high. These switches delay completion of the LPCI loop select logic during Single Loop Reactor Recirculation Pump operations (SLO) until the reactor pressure is less than 900 psig. With these switches out of tolerance high, LPCI loop select logic sensitivity was degraded, increasing the potential to select the wrong loop for injection during periods of SLO. At the time of discovery, both Reactor Recirculation pumps were in operation.
Both switches were recalibrated immediately upon discovery to within Technical Specification tolerances. The NRC Resident Inspector was notified of this event by the licensee. |
| Where | |
|---|---|
Quad Cities  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| Time - Person (Reporting Time:+-0.95 h-0.0396 days <br />-0.00565 weeks <br />-0.0013 months <br />) | |
| Opened: | Mike Maclennan 01:28 Jul 31, 2004 |
| NRC Officer: | John Mackinnon |
| Last Updated: | Jul 31, 2004 |
| 40912 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (85 %) |
| After | Power Operation (85 %) |
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