ENS 52436
ENS Event | |
|---|---|
07:39 Oct 28, 2016 | |
| Title | Invalid Actuation of Containment Isolation Valves |
| Event Description | This telephone notification is being made in lieu of a Licensee Event Report in accordance with 10CFR50.73(a)(1) to notify the NRC of on invalid actuation of a group isolation, reportable under 10CFR50.73(a)(2)(iv)(A).
On October 28, at 0139 Central Daylight Time, electricians were removing a test jack from a terminal on a primary containment isolation system relay due to the test jack being installed on the wrong relay. During removal of the test jack, a neutral wire came out of the terminal causing multiple relay actuations resulting in a half Group 2 isolation signal on the Division 2 side. Because of the plant being in Mode 5, refueling, the only isolation valves that closed because of the invalid isolation signal were the Division 2 isolation valves associated with the drywell ventilation monitor and the drywell floor and equipment sumps. The specific train and system actuated was the Primary Containment Isolation System [PCIS] Division 2 portion of the Group 2 isolation circuit (i.e. half group isolation). This was a partial actuation affecting only half of the logic and causing isolation of two systems. Based on the inadvertent actuation of the affected PCIS relays, the system isolated and functioned as expected. The isolation signal was reset at 0230 and the affected systems restored to service. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Cooper  Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+1153.73 h48.072 days <br />6.867 weeks <br />1.58 months <br />) | |
| Opened: | David Van Der Kamp 10:23 Dec 15, 2016 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Dec 15, 2016 |
| 52436 - 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 52436\u003C/a\u003E - \u003Ca href=\"/Cooper\" title=\"Cooper\"\u003ECooper\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EInvalid Actuation of Containment Isolation Valves\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 52436 - Cooper\n","link":"","lat":40.359658333333336,"lon":-95.65465277777778,"icon":"/w/images/7/79/Entergy_icon.png"}],"imageoverlays":null} | |
WEEKMONTHYEARENS 537762018-10-13T05:00:00013 October 2018 05:00:00
[Table view]10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification of Invalid Specified System Actuation ENS 524362016-10-28T07:39:00028 October 2016 07:39:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Containment Isolation Valves ENS 463672010-08-31T22:37:00031 August 2010 22:37:00 10 CFR 50.73(a)(1), Submit an LER Invalid Primary Containment Isolation System Actuation Due to a Voltage Transient ENS 430972006-11-20T02:28:00020 November 2006 02:28:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Primary Containment Isolation System ENS 406972004-03-09T18:42:0009 March 2004 18:42:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation Due to Momentary Power Interruption 2018-10-13T05:00:00 | |