ML053220457
| ML053220457 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 11/15/2005 |
| From: | - No Known Affiliation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2004-0307 | |
| Download: ML053220457 (2) | |
Text
Palo Verde Unit 2 - June 14, 2004 Loss of Offsite Power Event -June 25, 2004 (9:49AM)
Event-Related Facts Assumptions Model Changes Questions/NoteslSensitivity I EDG 4A" failed to start Not recoverable due to circuitry failure in
- EPS-DGN-FS-DGA = True to calculate CCF 2 Charging pump "E* failed Not recoverable due to air binding -
- CVC-MDP-FS-CHE = True
,.operator have to bleed pump
- EPS-DGN-FR-FTRM N. EDG FTR-medium basic 2 hrs 15 mins p
5 hrsmission time = 2.0 event applies to the time A AFW-TDP-FR-A mission range of 0.5 to 14 hrs time = 2.5 hrs 4 Offsite power available Recovery of power to first vital bus possible See below Q. Can power to vital bus be from Dever line shortly within one hour following a postulated SBO recovered within 60 min?
after event initiation Q. What are the stepstactions needed for recovery?
S. Do sensItivity analysis for offslte power recovery within 30 minutes for all three basic event below Recovery of power during a postulated OEP-XHE-NOREC-ST = 0.1 S. Do sensitivity analysis for SBO and AFW failure:
offslte power recovery within
- Time available = time required (time to (10 x 5 x 2 x le-3 = 0.1) 30 minutes (P = 0.01 with core uncovery is I hr)
Time Available = nominal or
- Stress = extreme (core uncovery xi) imminent if operator fails)
- Complexity = moderate (communications and coordination required outside control room)
- All other performance shaping factors are nominal V
II I
. s
.9 an 4
5 RCP seals are the KSB SPAR uses the CE RCP seal LOCA model, None S. Do sensitivity analysis type where the licensee which is under review by NRC using conservative seal LOCA claims not to fail during model loss of seal cooling/injection (about 17 gpm leak) 6 No EDG recovery credited SPAR does not credit nominal EDG None S. Does not affect dominate recovery sequences