ENS 49674

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v t e ENS Event
20:00 Dec 23, 2013
Title	Historical Gaps in High Energy Line Break Barrier
Event Description	At 1930 EST on June 7, 2012, it was determined that a series of gaps in a high energy line break (HELB) barrier rendered equipment in the west 480 VAC switchgear room inoperable. There is evidence that this condition had existed since initial construction. The openings were sealed and the equipment restored to operable status at 1605 EST on June 8, 2012. This condition was previously reported to the NRC pursuant to 10 CFR 50.73(a)(2)(i)(B) in LER 2012-001-00. Upon further engineering analysis, it was determined that for limited exposure times safety functions could have been prevented for certain postulated high energy line breaks. Therefore, this condition is also being reported pursuant to 10 CFR 50.73(a)(2)(v)(A),(D), and 10 CFR 50.72(b)(3)(v). The NRC Senior Resident Inspector has been notified.

ENS 49674 +/-
Where
Millstone Connecticut (NRC Region 1)
Reporting

10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+-3.47 h-0.145 days <br />-0.0207 weeks <br />-0.00475 months <br />)
Opened:	Walter Orf 16:32 Dec 23, 2013
NRC Officer:	Charles Teal
Last Updated:	Dec 23, 2013
49674 - NRC Website Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 49674\u003C/a\u003E - \u003Ca href=\"/Millstone\" title=\"Millstone\"\u003EMillstone\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EHistorical Gaps in High Energy Line Break Barrier\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 49674 - Millstone\n","link":"","lat":41.310722222222225,"lon":-72.16767777777778,"icon":"/w/images/b/b0/Dominion_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Millstone with 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR		2024-08-21T16:00:00 [Table view]
[ENS list for Millstone]

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