ENS 44718
ENS Event | |
---|---|
20:20 Dec 13, 2008 | |
Title | Steam Exclusion Boundary Door Latch Failure |
Event Description | At 1420 on 12/13/08 a plant electrician identified that a steam exclusion door would not close when he was transiting through the door. This door would not have closed and maintained the Steam Exclusion Boundary and could have led to steam through out the Auxiliary Building which could have resulted in both Trains of ESF Equipment failing to perform their required functions, i.e., SI, RHR, CC etc. A Unit Supervisor who was in the Auxiliary Building at the time immediately went up to the door and found the latch was broke and the broken piece was removed which then enabled the door to close and latch. At 1425 on 12/13/08 the Steam Exclusion Boundary was restored to functional and both Trains of ESF Equipment restored to operable.
The licensee informed the NRC Resident Inspector.
01/22/2009 - Retraction of EN 44718, both trains of Engineered Safeguards Features (ESF) equipment inoperable due to a degraded steam exclusion boundary door. EN 44718 provided notification that both trains of ESF equipment (e.g. SI, RHR, CCW, etc.) were inoperable due to degradation of a steam exclusion boundary door in the auxiliary building on December 13, 2008. Subsequent engineering evaluation determined that the degraded door remained capable of fulfilling its steam exclusion function during the brief (five minute) period when it was degraded. A degraded latch mechanism prevented the door from latching closed. However, the door was closed against its door jam, which resulted in a sufficiently small gap such that total allowed leak path criteria were not exceeded. Additionally, the door swing was in the direction of postulated steam flow, such that the door would have been held in the closed position by any steam overpressure postulated under accident conditions. Therefore, the door remained functional and the supported ESF equipment in the auxiliary building remained operable. Consequently, this condition did not meet the reportabllity Criteria in 10 CFR 50.72. As a result, the notification made on 12/13/2008 (EN 44718) is hereby retracted. The licensee will notify the NRC Resident Inspector. Notified the R3DO (O'Brien). |
Where | |
---|---|
Kewaunee ![]() Wisconsin (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
Time - Person (Reporting Time:+-2.83 h-0.118 days <br />-0.0168 weeks <br />-0.00388 months <br />) | |
Opened: | David Karst 17:30 Dec 13, 2008 |
NRC Officer: | Steve Sandin |
Last Updated: | Jan 22, 2009 |
44718 - 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 44718\u003C/a\u003E - \u003Ca href=\"/Kewaunee\" title=\"Kewaunee\"\u003EKewaunee\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ESteam Exclusion Boundary Door Latch Failure\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 44718 - Kewaunee\n","link":"","lat":44.342975,"lon":-87.53713055555555,"icon":"/w/images/b/b0/Dominion_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Kewaunee ![]() | |
![]() Nov 27 Dec 4 Dec 11 Dec 18 Dec 25 Jan 1 Jan 8 Jan 15 Jan 22 Jan 29 Feb 5 Feb 12 Feb 19 Feb 26 Mar 4 Mar 11 Mar 18 Mar 25 Apr 1 Apr 8 Apr 15 Apr 22 Apr 29 May 6 May 13 May 20 May 27 Jun 3 Jun 10 Jun 17 Jun 24 Jul 1 Jul 8 Jul 15 Jul 22 Jul 29 Aug 5 Aug 12 Aug 19 Aug 26 Sep 2 Sep 9 Sep 16 Sep 23 ![]() ![]() ![]() Jun Jul Aug Sep Oct Nov Dec 2011 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2012 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2013 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2014 Feb Mar 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 ![]() | |