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 %) |
WEEKMONTHYEARENS 536222018-09-25T05:00:00025 September 2018 05:00:00
[Table view]10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Control Building Chillers in Unanalyzed Condition ENS 533822018-05-04T16:29:0004 May 2018 16:29:00 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Associated with Damaging Effects of Tornados ENS 533242018-04-11T06:50:00011 April 2018 06:50:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Condition That Could Impair Function of Control Building Ac System ENS 525682017-02-20T18:40:00020 February 2017 18:40:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Due to Potential Failure of Control Room and Control Building Air Handling Units ENS 503242014-07-30T14:40:00030 July 2014 14:40:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Ultimate Heat Sink in an Unanalyzed Condition ENS 497052014-01-09T06:00:0009 January 2014 06:00:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Identified from Operating Experience Review ENS 433792007-05-21T17:31:00021 May 2007 17:31:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Potential Division 1 Edg Damage Due to Loss of Service Water Cooling During Control Room Fire ENS 422432006-01-05T15:30:0005 January 2006 15:30:00 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition Unanalyzed Condition Involving Rcic Operation During Mcr Evacuation 2018-09-25T05:00:00 | |
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