ENS 48030

From kanterella

Jump to navigation Jump to search

v t e ENS Event
00:58 Apr 23, 2012
Title	Keowee Hydro Power Station Automatically Started Based on an Invalid Signal
Event Description	At 1958 [EDT] on 4/22/2012, Oconee emergency power (Keowee Hydro Station Units 1 and 2) automatically started based upon an invalid signal. In progress at the time was the Unit 3 Keowee Emergency Start Channel B Isolations section of the Unit 3 Engineered Safety Features Actuation System Replacement Modification procedure. A step in this procedure provided direction for a jumper to be connected between links B-13 and B-14. However, this jumper was placed between links A-13 and A-14, which caused the start of the Keowee units. During the period the jumpers were inadvertently installed, the Keowee units remained operable and available to supply emergency power to Units 1, 2, and/or 3. Both Keowee units were shutdown from the inadvertent emergency start actuation and the emergency start signal was reset per procedure at 0156 [EDT] hours on 4/23/2012. The cause for the misplaced jumper was determined to be a human performance error by the technicians. As required per NUREG 1022, Rev.2 the following information is provided: (a) The specific train(s) and system(s) that were actuated: In this event, both Keowee Hydro Units 1 and 2 actuated because of the emergency start signal being generated by Channel A. (b) Whether each train actuation was complete or partial: The automatic actuation of the Keowee units was completed. (c) Whether or not the system started and functioned successfully: No problems or issues were identified with the performance of the Keowee Hydro Units in response to the emergency start. Therefore this condition is being reported for Oconee 1, 2, and 3 as an invalid actuation under 10 CFR 50.73 (a)(2)(iv)(A), which allows NRC notification via telephone per 10 CFR 50.73(a)(1). Corrective Actions: - Work was stopped on the Unit 3 Engineered Safety Features Actuation System Replacement Modification procedure; - Immediate investigation was conducted to determine the impact of the jumper activity as well as development of a recovery plan; and - The jumper was removed from links A-13 and A-14 and the Keowee units were shutdown. The NRC Resident Inspector was informed.

ENS 48030 +/-
Where
Oconee South Carolina (NRC Region 2)
Reporting

10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation
Time - Person (Reporting Time:+1287.03 h53.626 days <br />7.661 weeks <br />1.763 months <br />)
Opened:	Corey Gray 16:00 Jun 15, 2012
NRC Officer:	Pete Snyder
Last Updated:	Jun 15, 2012
48030 - 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 48030\u003C/a\u003E - \u003Ca href=\"/Oconee\" title=\"Oconee\"\u003EOconee\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EKeowee Hydro Power Station Automatically Started Based on an Invalid Signal\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 48030 - Oconee\n","link":"","lat":34.79336388888889,"lon":-82.89360555555555,"icon":"/w/images/7/75/Duke_Energy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Oconee with 10 CFR 50.73(a)(1), Submit an LER
WEEKMONTHYEAR2012-04-23T00:58:00 [Table view]
[ENS list for Oconee]

Retrieved from "https://kanterella.com/w/index.php?title=ENS_48030&oldid=423828"