ENS 41539
ENS Event | |
---|---|
21:30 Mar 28, 2005 | |
Title | Historical Report - After-The-Fact Operability Assessment |
Event Description | The licensee provided the following information:
This event notification reports a previously unrecognized reportable event that occurred in 2002. This past event is being reported under the criterion of 10CFR50.72(b)(3)(ii)(B), an event or condition that results in the plant being in an unanalyzed condition. On 1/23/2002, at 1815 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.906075e-4 months <br />, while the plant was operating at full power, the plant entered a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Technical Specifications (TS) limiting conditions for operation (LCO) for one train of the Residual Heat Removal (RHR) system. The RHR system LCO was entered when the plant discovered a potential for reaching pump runout under specific post-accident operating conditions for single pump operation of the Component Cooling Water (CCW) system. The CCW system provides cooling support to the RHR system for post-accident long term recirculation core and containment cooling operation. The RHR train was returned to service at 2002 hours0.0232 days <br />0.556 hours <br />0.00331 weeks <br />7.61761e-4 months <br /> on 01/25/2002, within the TS allowed 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, after a flow limiting device was installed on a non-critical CCW system flaw control air operated valve. An after-the-fact past operability assessment of the condition found that, compared to corrective actions taken to remove the potential for runout, the condition potentially existed since original plant design. As a minimum, it existed for a period longer than the TS allowed LCO for the RHR system. Therefore, an unanalyzed condition did exist and as such this is a late report. The licensee notified the NRC Resident Inspector. |
Where | |
---|---|
Kewaunee ![]() Wisconsin (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition | |
LER: | 05000305/LER-2005-007 Regarding Unanalyzed Condition: Design Deficiency - Component Cooling Water System Inoperable Due to Pump Run Out Conditions |
Time - Person (Reporting Time:+1.38 h0.0575 days <br />0.00821 weeks <br />0.00189 months <br />) | |
Opened: | Al Prokash 22:53 Mar 28, 2005 |
NRC Officer: | John Knoke |
Last Updated: | Mar 28, 2005 |
41539 - 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 41539\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\u003EHistorical Report - After-The-Fact Operability Assessment\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 41539 - Kewaunee\n","link":"","lat":44.342975,"lon":-87.53713055555555,"icon":"/w/images/b/b0/Dominion_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
---|---|
Reactor critical | Not Critical |
Scram | No |
Before | Refueling Shutdown (0 %) |
After | Refueling Shutdown (0 %) |