ENS 49638: Difference between revisions
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| event date = 12/16/2013 16:27 CST | | event date = 12/16/2013 16:27 CST | ||
| last update date = 12/16/2013 | | last update date = 12/16/2013 | ||
| title = Unanalyzed Condition Due | | title = Unanalyzed Condition Due to Unfused Direct Current Ammeter Circuits | ||
| event text = At 1627 CST on December 16, 2013 Farley Nuclear Plant determined that the following was an unanalyzed condition: | | event text = At 1627 CST on December 16, 2013 Farley Nuclear Plant determined that the following was an unanalyzed condition: | ||
As a result of recent industry operating experience (OE 305419, EN 49411, EN 49419) regarding the impact of un-fused Direct Current (DC) ammeter circuits in the Control Room, Farley performed a review of ammeter circuitry for similar issues. The review determined the described condition to be applicable to Farley resulting in an unanalyzed condition with respect to 10 CFR 50 Appendix R analysis requirements. The wiring design for the ammeters contains a shunt in the current flow from each DC battery and battery charger, but the ammeter wiring attached to the shunt does not contain fuses. | As a result of recent industry operating experience (OE 305419, EN 49411, EN 49419) regarding the impact of un-fused Direct Current (DC) ammeter circuits in the Control Room, Farley performed a review of ammeter circuitry for similar issues. The review determined the described condition to be applicable to Farley resulting in an unanalyzed condition with respect to 10 CFR 50 Appendix R analysis requirements. The wiring design for the ammeters contains a shunt in the current flow from each DC battery and battery charger, but the ammeter wiring attached to the shunt does not contain fuses. |
Latest revision as of 21:52, 1 March 2018
Where | |
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Farley ![]() Alabama (NRC Region 2) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
Time - Person (Reporting Time:+-0.83 h-0.0346 days <br />-0.00494 weeks <br />-0.00114 months <br />) | |
Opened: | Darrin Gard 21:37 Dec 16, 2013 |
NRC Officer: | Daniel Mills |
Last Updated: | Dec 16, 2013 |
49638 - NRC Website
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