ENS 43151
ENS Event | |
|---|---|
10:30 Feb 7, 2007 | |
| Title | |
| Event Description | Between 0430 and 0457 on 2-7-2007, the alarm for 'HPCI Inverter Circuit Failure' was received three times. Indications on High Pressure Coolant Injection (HPCI) pressure instruments and the HPCI Flow Controller also showed oscillations. The power indicating light on the HPCI inverter was also observed to extinguish and re-illuminate once. Because of the alarms and changes in indications, the capability of the inverter is questionable, and HPCI may not be capable of performing its required functions.
HPCI was declared inoperable as of 0430, resulting in entry into Tech Spec LCO 3.5.1 Condition C - HPCI System Inoperable and 3.5.1 Condition D - HPCI System Inoperable and Condition A entered. At the time HPCI was declared inoperable, Core Spray Loop A was also Inoperable for planned maintenance, day 2 of a 7 day LCO. Required Actions for Condition D are to restore either HPCI or the low pressure ECCS injection/spray system to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Troubleshooting activities for HPCI are being planned, and maintenance and testing activities for Core Spray A are continuing. Completion of the maintenance window for Core Spray A is scheduled for later this afternoon, and activities for Core Spray are currently on schedule. HPCI is a single train system. This report is submitted as a condition that at time of discovery could prevent the fulfillment of the safety function of an SSC needed to mitigate the consequence of an accident. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Cooper  Nebraska (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
| LER: | 05000298/LER-2007-001 |
| Time - Person (Reporting Time:+0.67 h0.0279 days <br />0.00399 weeks <br />9.17766e-4 months <br />) | |
| Opened: | John Meyers 11:10 Feb 7, 2007 |
| NRC Officer: | Jason Kozal |
| Last Updated: | Feb 7, 2007 |
| 43151 - 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 43151\u003C/a\u003E - \u003Ca href=\"/Cooper\" title=\"Cooper\"\u003ECooper\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EHigh Pressure Coolant Injection System Inoperable\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 43151 - Cooper\n","link":"","lat":40.359658333333336,"lon":-95.65465277777778,"icon":"/w/images/7/79/Entergy_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |