ENS 41804
ENS Event | |
---|---|
07:43 Apr 29, 2005 | |
Title | Invalid System Actuation |
Event Description | This report is being made under 50.73 (a)(2)(iv)(A).
On April 29, 2005, at approximately 0043 Mountain Standard Time, Palo Verde Nuclear Generating Station Unit 2 experienced an invalid 1/2 leg Engineered Safety Feature Actuation Signal (ESFAS) actuation (B train) when operations personnel prematurely implemented a tag out causing loss of vital power to the 'B' train ESFAS cabinet. The following alarms were received; Recirculation Actuation Signal B, Auxiliary Feedwater Actuation Signal-1B, Containment Spray Actuation Signal B, Main Steam Isolation Signal B, Containment Isolation Actuation Signal B, Safety Injection Actuation Signal B, Auxiliary Feedwater Actuation Signal-2B (all Leg 1-3), and Emergency Diesel Generator (EDG) Start Signal B. At the time of the event Unit 2 was in the 'B' train work window for refueling outage 2R12 and not all 'B' train equipment actuated - EDG B, Low Pressure Safety Injection B, Containment Spray B, and the B train Recirculation Actuation Signal sump valves were tagged out of service for maintenance. During the performance of the 'Inadvertent Plant Protection System - ESFAS Actuations' procedure, Operations personnel determined that all 'B' ESFAS equipment operated as expected considering the 'B' train equipment that was tagged out for maintenance. The licensee notified the NRC Resident Inspector. |
Where | |
---|---|
Palo Verde Arizona (NRC Region 4) | |
Reporting | |
10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
Time - Person (Reporting Time:+1447.78 h60.324 days <br />8.618 weeks <br />1.983 months <br />) | |
Opened: | Duane Kanitz 15:30 Jun 28, 2005 |
NRC Officer: | Bill Gott |
Last Updated: | Jun 28, 2005 |
41804 - 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 41804\u003C/a\u003E - \u003Ca href=\"/Palo_Verde\" title=\"Palo Verde\"\u003EPalo Verde\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EInvalid System Actuation\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 41804 - Palo Verde\n","link":"","lat":33.386894444444444,"lon":-112.86263333333333,"icon":"/w/images/9/93/Arizona_Public_Service_icon.png"}],"imageoverlays":null} | |
WEEKMONTHYEARENS 559262022-04-12T03:45:00012 April 2022 03:45:00
[Table view]10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation ENS 550322020-12-11T07:00:00011 December 2020 07:00:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Option Telephonic Notification of an Invalid Specified System Actuation ENS 547012020-03-14T19:44:00014 March 2020 19:44:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Spray Pond Pump System - 60 Day Reports ENS 524132016-10-17T22:19:00017 October 2016 22:19:00 10 CFR 50.73(a)(1), Submit an LER Invalid Engineered Safety Features Actuation System (Esfas) Signal ENS 522282016-07-12T12:50:00012 July 2016 12:50:00 10 CFR 50.73(a)(1), Submit an LER Invalid Actuation of Both Trains Essential Spray Pond System ENS 498072013-12-12T03:11:00012 December 2013 03:11:00 10 CFR 50.73(a)(1), Submit an LER 60 Day Report for an Invalid Main Steam Line Actuation ENS 486152012-10-26T04:08:00026 October 2012 04:08:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Telephonic Notification for an Invalid Actuation of the Essential Spray Pond System ENS 468982011-04-03T21:44:0003 April 2011 21:44:00 10 CFR 50.73(a)(1), Submit an LER 60-Day Optional Notification of Invalid Start of the 'A' Emergency Diesel Generator ENS 427342006-06-06T01:44:0006 June 2006 01:44:00 10 CFR 50.73(a)(1), Submit an LER Invalid Emergency Diesel Generator Start ENS 418042005-04-29T07:43:00029 April 2005 07:43:00 10 CFR 50.73(a)(1), Submit an LER Invalid System Actuation 2022-04-12T03:45:00 | |