ENS 49705
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ENS Event | |
|---|---|
06:00 Jan 9, 2014 | |
| Title | Unanalyzed Condition Identified from Operating Experience Review |
| Event Description | A review of industry operating experience regarding the impact of unfused [safety-related] direct current ammeter circuits in the main control room has determined the described condition [having the ammeters installed] to be applicable to River Bend Station, resulting in a potentially unanalyzed condition with respect to 10 CFR 50 Appendix R analysis requirements. River Bend Station does have unfused ammeter leads. This normally is not a concern, since two failures are required to cause the problem described in the document referenced above; an ammeter lead must short to ground, and another lead of the opposite polarity must also short to ground. Either of these events by itself will set an alarm, but not cause equipment damage. This allows for locating and repairing the problem before the second failure occurs. However, during a fire, there is a greater chance that these two failures could happen simultaneously, or before a single failure can be repaired.
This condition is being reported in accordance with 10 CFR 50.72(b)(3)(ii)(B). Interim compensatory measures have been implemented. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
| River Bend Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
| Time - Person (Reporting Time:+9.48 h0.395 days <br />0.0564 weeks <br />0.013 months <br />) | |
| Opened: | Dan Pipkin 15:29 Jan 9, 2014 |
| NRC Officer: | Nestor Makris |
| Last Updated: | Jan 9, 2014 |
| 49705 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
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