ENS 42138
ENS Event | |
|---|---|
02:34 Nov 12, 2005 | |
| Title | Manual Reactor Trip After Loss of All Condenser Circulating Water Pumps |
| Event Description | Waterford 3 manually tripped the reactor at 20:34 [CST] on 11/11/05 due to lowering main condenser vacuum caused by a loss of all circ water pumps. Subsequently an Emergency Feedwater Actuation Signal (EFAS) was received due to low steam generator levels. The plant is currently being maintained in mode 3 with both Steam Generators being fed from the Auxiliary Feedwater system with Steam Generator levels in the normal operational band for mode 3. The EFAS has been reset. The plant will be maintained in Mode 3 while a Post Trip Review is performed. This report is submitted as required by 10CFR50.72.
All control rods fully inserted on the manual trip. The main steam isolation valves are shut and the heat sink is through the atmospheric dump valves. The electrical grid is stable and plant power is from the startup transformer. No primary or secondary relief valves or safety valves lifted. The site was able to restart the B & D circ water pumps. There is no significant steam generator tube leakage. The licensee notified the NRC Resident Inspector.
This notification is an update to an immediate notification that was called into the NRC Operations Center at 04:48 (eastern time) on November 12, 2005 (Event # 42138). The event was reported as an 8-hour event. This update to the original notification is to communicate that, based on further review, the event notification should have been made within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> since it was reportable within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> as well as the 8-hour reporting criteria and therefore the call should have been made within the 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> period. The condition is reportable under four hour reporting criteria 50.72(b)(2)(iv)(B) for a manual trip of the plant in anticipation of receiving a RPS Trip with the Reactor critical. The condition is reportable within eight hour reporting criteria 50.72(b)(3)(iv)(A) for the automatic actuation of EFAS upon low steam generator levels. This update does not report a change to the event description reported. As mentioned in the original report, Waterford 3 manually tripped the reactor at 20:34 on November 11, 2005 due to lowering main condenser vacuum caused by a loss of all circulating water pumps. Subsequently an Emergency Feedwater Actuation Signal (EFAS) was received due to low steam generator levels. The plant was then maintained in Mode 3 with both steam generators being fed from the Auxiliary Feedwater System with steam generator levels in the normal operational band for Mode 3. The EFAS had been reset at the time of the original notification. The plant was maintained in Mode 3 while a Post Trip Review was performed. Further details of the event will be reported under the 60 day LER reporting criteria. The licensee notified the NRC Resident Inspector. R4DO (Clark) notified. |
| Where | |
|---|---|
Waterford  Louisiana (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| Time - Person (Reporting Time:+2.23 h0.0929 days <br />0.0133 weeks <br />0.00305 months <br />) | |
| Opened: | Paul Wood 04:48 Nov 12, 2005 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Nov 14, 2005 |
| 42138 - 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 42138\u003C/a\u003E - \u003Ca href=\"/Waterford\" title=\"Waterford\"\u003EWaterford\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EManual Reactor Trip After Loss of All Condenser Circulating Water Pumps\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 42138 - Waterford\n","link":"","lat":29.993747222222222,"lon":-90.4687111111111,"icon":"/w/images/7/79/Entergy_icon.png"}],"imageoverlays":null} | |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (100 %) |
| After | Hot Standby (0 %) |