ENS 46769
ENS Event | |
---|---|
19:30 Apr 19, 2011 | |
Title | Both Divisions of Residual Heat Removal Inoperable |
Event Description | At 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br />, a water leak was discovered on the Unit 1 Emergency Diesel Generator Cooling Water Pump (EDGCWP) room cooler. As a result, the Unit 1 EDG (Division II) was declared inoperable and Technical Specification (TS) 3.8.1 was entered.
At this time, Division I RHR was inoperable for planned maintenance on the Division I RHR room cooler. In the event of a LOOP/LOCA scenario, RHR would not have been able to perform its safety function (i.e., Division I RHR was impacted by the ongoing room cooler maintenance and Division II RHR would not have had an operable on-site emergency power source). Given the impact on the RHR system, this event is reportable under 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of a safety function required to mitigate the consequences of an accident. Note that at the time of discovery, offsite power was available to Division II RHR as well as the Division I and Division II Core Spray systems. At 1816 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.90988e-4 months <br />, the Division I RHR system room cooler was restored and Division I RHR was declared operable. The licensee has notified the NRC Resident Inspector. |
Where | |
---|---|
Quad Cities Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000254/LER-2011-001 |
Time - Person (Reporting Time:+0.98 h0.0408 days <br />0.00583 weeks <br />0.00134 months <br />) | |
Opened: | Ronald Rustick 20:29 Apr 19, 2011 |
NRC Officer: | Joe O'Hara |
Last Updated: | Apr 19, 2011 |
46769 - 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 46769\u003C/a\u003E - \u003Ca href=\"/Quad_Cities\" title=\"Quad Cities\"\u003EQuad Cities\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EBoth Divisions of Residual Heat Removal Inoperable\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 46769 - Quad Cities\n","link":"","lat":41.72591944444444,"lon":-90.31058888888889,"icon":"/w/images/b/be/Constellation_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |