ML19035A619
| ML19035A619 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 02/04/2019 |
| From: | NRC |
| To: | NRC/NRO/DLSE/LB4 |
| References | |
| Download: ML19035A619 (9) | |
Text
Steve Leighty
Jordan/Chandu, During the 4Q18 LARM, Rob indicated that the electrical branch staff have questions related to our recent extension of open phase regulatory commitments (reference ML18242A012).
We took the action to setup a public call to discuss these. Can you please identify what questions staff have so that we can prepare for this public meeting? Once we get those questions, we'll identify right participants and let you know what their availability is to support a discussion during one of the Thursday public calls. Thanks!
Open Phase Condition"Please discuss the technical rationale for moving the implementation of the OPC [Open Phase Condition] commitment to before the end of the second refueling outage. Staff understands that Vogtle 1&2 will implement open phase detection and alarm by the end of 2018. In addition, staff understands that Vogtle 3 shares a 230/500 kV switchyard with Vogtle 1&2, and Vogtle 4 is connected to a 500kV switchyard. Given the above, staff is unclear what information is needed before implementing the open phase detection and alarm. Please discuss if there is data being gathered during operation before implementing the open phase detection and alarm." Q1.Discuss the technical rationale for moving the implementation of the OPC commitment to before the end of the second refueling outage. V3&4 AP1000 AP1000
AP1000AP1000 AP1000 AP1000AP1000V3&4 Q2.Since Vogtle 1&2 will implement open phase detection and alarm by the end of 2018 and Vogtle 3 shares a 230/500 kV switchyard with Vogtle 1&2, and Vogtle 4 is connected to a 500kV switchyard, what information is needed before implementing the open phase detection and alarm. Is data being gathered during operation before implementing the open phase detection and alarm AP1000