ENS 41264
ENS Event | |
|---|---|
05:00 Nov 22, 2004 | |
| Title | Potential Non-Conservatism in Butterfly Valve Torque Predictions Under Compressible Flow Conditions. |
| Event Description | Issue:
By letter dated October 26, 2004, Electric Power Research Institute (EPRI) notified affected members in accordance with 10 CPR 21.21(b), of a non-conservatism in the [software product of] EPRI Motor Operated Valve Performance Prediction Methodology (PPM), Versions 1.0 through 3.2, to predict total required dynamic torque under compressible flow conditions for actuators for butterfly valves with single disc offset designs. As explained in the error notice, the non-conservatism could be as much as 45 percent. This non-conservatism could potentially jeopardize the design basis operation of associated safety related applications. Southern Nuclear Company (SNC) subsequently performed an engineering evaluation based on the EPRI notification as it related to Vogtle Electric Generating Plant (VEGP). The assessment did not identify any instances where the PPM had actually been used for such purposes at VEGP. Corrective Action: This issue has been entered into the SNC Corrective Action Program. SNC will evaluate the restrictions, adjustments, and recommendations regarding use of the EPRI MOV PPM, Versions 1.0 through 3.2, that were communicated in EPRI PPM Software Error Notice 2004-2. |
| Where | |
|---|---|
| Vogtle Georgia (NRC Region 2) | |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+558.25 h23.26 days <br />3.323 weeks <br />0.765 months <br />) | |
| Opened: | Jeffery Gasser 11:15 Dec 15, 2004 |
| NRC Officer: | Chauncey Gould |
| Last Updated: | Dec 15, 2004 |
| 41264 - 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 41264\u003C/a\u003E - \u003Ca href=\"/Vogtle\" title=\"Vogtle\"\u003EVogtle\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EPotential Non-Conservatism in Butterfly Valve Torque Predictions Under Compressible Flow Conditions.\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 41264 - Vogtle\n","link":"","lat":33.13062222222222,"lon":-81.77135277777778,"icon":"/w/images/1/14/Southern_Nuclear_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Vogtle | |
WEEKMONTHYEARENS 412642004-11-22T05:00:00022 November 2004 05:00:00
[Table view]10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Potential Non-Conservatism in Butterfly Valve Torque Predictions Under Compressible Flow Conditions. 2004-11-22T05:00:00 | |