ML053130108
Jump to navigation
Jump to search
| ML053130108 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 11/02/2005 |
| From: | Thomas Koshy NRC/NRR/ADES/DE |
| To: | |
| References | |
| FOIA/PA-2004-0307 | |
| Download: ML053130108 (4) | |
Text
Electrical Grid Problems Identified at Palo Verde Thomas Koshy, EEIB (n
V..
, X o
M
. M.
CD 01 Division of Engineering Office of Nuclear Reactor Regulation
Purpose X Proposed by Richard Barrett, Director, DE X Information to understand grid vulnerabilities that could lead to loss of offsite power for long duration Success
- ET & LT understand the grid centered problems Not For Public Release 2
Agenda
- Description of the event
- Root cause
- Design Deficiency
- Impact on 500KV Grid
- Corrective Actions Not For Public Release 3
Event Description
- On June 14, 2004 at 7:44 a.m. all three Palo Verde Units tripped. One EDG for unit #2 failed to run
- Unit #2 went into an Alert because of one EDG and all offsite power unavailability
. All three units tripped from loss of load
- Electrical fault remained for 39sec.,
- Offsite power recovered by 8:18 a.m.
- 9:51 a.m. safety buses energized from offsite power for unit#2 Not For Public Release 4