ENS 50778

From kanterella

Jump to navigation Jump to search

v t e ENS Event
00:57 Jan 29, 2015
Title	Safety System Will Not Function as Required
Event Description	At 1957 EST on 01/28/2015, with the unit in Mode 1 at 100 percent power, it was discovered that a modification installed during the fall 2013 refueling outage at H. B. Robinson inadvertently cross connected both trains of reactor protection. This cross connection resulted in both trains of safety injection being required to actuate in order to produce a reactor protection reactor trip. This is reportable pursuant to 10 CFR 50.36(c)(1)(ii)(A) since it was determined that an automatic safety system does not function as required. The cross connection of the reactor protection trains presented an unanalyzed condition and is reportable pursuant to 10 CFR 50.72(b)(3)(ii)(B). An additional unanalyzed condition was identified in which the 'A' and 'B' DC Train systems were cross connected by the same condition and is reportable pursuant to 10 CFR 50.72(b)(3)(ii)(B). This condition is also being reported as an eight hour non-emergency under 10 CFR 50.72(b)(3)(v)(D) condition that could prevent fulfillment of safety functions. At no time during this occurrence was the public or plant staff at risk as a result of this event. The NRC Resident Inspector has been notified. This condition did place the unit in Technical Specification 3.0.3 for the reactor protection system and the DC vital buses, but the condition causing the issue was cleared at 2048 EST prior to any lowering of reactor power. The licensee will be notifying appropriate State, local and other government agencies as required.

ENS 50778 +/-
Where
Robinson South Carolina (NRC Region 2)
Reporting

Other Unspec Reqmnt 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+-4.03 h-0.168 days <br />-0.024 weeks <br />-0.00552 months <br />)
Opened:	Nick Roh 20:55 Jan 28, 2015
NRC Officer:	Jeff Rotton
Last Updated:	Jan 28, 2015
50778 - 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 50778\u003C/a\u003E - \u003Ca href=\"/Robinson\" title=\"Robinson\"\u003ERobinson\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ESafety System Will Not Function as Required\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 50778 - Robinson\n","link":"","lat":34.40111111111111,"lon":-80.15933333333334,"icon":"/w/images/7/75/Duke_Energy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Robinson with Other Unspec Reqmnt, 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
WEEKMONTHYEAR2016-08-11T19:05:00 [Table view]
[ENS list for Robinson]

Retrieved from "https://kanterella.com/w/index.php?title=ENS_50778&oldid=421798"