ENS 41264

v t e 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.

ENS 41264 +/-
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...
v • d • e

v t e Emergency Notification System
Vogtle with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation
WEEKMONTHYEAR2004-11-22T05:00:00 [Table view]
[ENS list for Vogtle]

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