ENS 52188
From kanterella
Jump to navigation
Jump to search
ENS Event | |
---|---|
23:26 Aug 17, 2016 | |
Title | Offsite Power Source Below the Operability Limit |
Event Description | At 1826 [CDT], Operators identified that off-site 161 kV power source predicted post-trip voltage was below the operability limit of 161.3 kV. [Operators] entered AOP-31, 161 kV Grid Malfunctions, Section 1, 161 kV Grid Instability, and declared House Service Transformers T1A-3 and T1A-4 inoperable. [Operators] entered Technical Specification 2.7(2)c. Per Technical Specification 2.7(2)c, 'Both house service transformers T1A-3 and T1A-4 (4.16kV) may be inoperable for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The loss of the 161kV incoming line renders both transformers inoperable. The NRC Operations Center shall be notified by telephone within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after inoperability of both transformers.'
Per OPPD [Omaha Public Power District] Transmission, grid conditions are currently stable. OPPD Transmission has successfully raised predicted post-trip 161 kV voltage with all predicted voltages meeting or exceeding operability requirement of 161.3 kV as of 1834. Current post-trip predicted voltage is 162.2 kV as of 2029. Lowest observed actual voltage was 163.7 kV. The 161 kV line and transformers T1A-3 and T1A-4 remained available at all times. The licensee notified the NRC Resident Inspector. |
Where | |
---|---|
Fort Calhoun ![]() Nebraska (NRC Region 4) | |
Reporting | |
Other Unspec Reqmnt | |
Time - Person (Reporting Time:+-1.93 h-0.0804 days <br />-0.0115 weeks <br />-0.00264 months <br />) | |
Opened: | Charles Smith 21:30 Aug 17, 2016 |
NRC Officer: | Vince Klco |
Last Updated: | Aug 17, 2016 |
52188 - 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 52188\u003C/a\u003E - \u003Ca href=\"/Fort_Calhoun\" title=\"Fort Calhoun\"\u003EFort Calhoun\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EOffsite Power Source Below the Operability Limit\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 52188 - Fort Calhoun\n","link":"","lat":41.520963888888886,"lon":-96.07684444444445,"icon":"/w/images/6/6a/Omaha_Public_Power_District_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 521882016-08-17T23:26:00017 August 2016 23:26:00
[Table view]Other Unspec Reqmnt Offsite Power Source Below the Operability Limit ENS 458982010-05-04T20:12:0004 May 2010 20:12:00 Other Unspec Reqmnt Discovery of After-The- Fact Emergency Condition - Unusual Event Due to Rcs Lineup ENS 436782007-10-01T18:15:0001 October 2007 18:15:00 Other Unspec Reqmnt Replacing the Emergency Response Facility Computer System ENS 435822007-08-21T02:03:00021 August 2007 02:03:00 Other Unspec Reqmnt Inoperable House Service Transformers ENS 408852004-07-20T23:18:00020 July 2004 23:18:00 Other Unspec Reqmnt 4-Hour Notification Required by Technical Specifications 2016-08-17T23:26:00 | |
Retrieved from "https://kanterella.com/w/index.php?title=ENS_52188&oldid=420884"